原生Android缩略图填满SD卡的问题
From:http://blog.csdn.net/fengye810130/article/details/9118221
google原生Android中，MiniThumbFile.java里存储图片/视频的缩略图的算法有问题。
该算法的漏洞造成微缩略图文件（
DCIM\.thumbnails\.thumbdata4--1967290299
）非常庞大和臃肿，多达1G，理论上可以无限大，直到填满SD卡
重现步骤：
第一步
：插入一张拥有10万张图片的外部ＳＤ卡，
第二步
：等待手机扫描完整个ＳＤ卡，这个过程大概30分钟。至于扫描是否完成，你可以看TAG为MediaProvider的日志。
第三步
：拔出外部SD卡，再次等手机进行扫描大概10分钟。
第四步
：按下手机的电源key +音量down key来截屏。
第五步
：通过电脑查看内部SD卡的DCIM\.thumbnails\.thumbdata4--1967290299文件。这时你会发现，该文件多达1G.
对于该问题，大概的逻辑是这样的：
MediaProvider会对SD卡上的文件的进行扫描，得到一些基本的信息放入数据库的files这个表中。
对于一些图片（比如手机截屏图片），手机会以这些图片文件在files表中的_id的值，作为一个定位标志，把其缩略文件存放在.thumbdata4--1967290299中。
比如
：_id为1，那么该文件的缩略图就存放在.thumbdata4--1967290299文件的_id * BYTES_PER_MINTHUMB开始的位置，其中BYTES_PER_MINTHUMB = 17000，
对此可以参照MiniThumbFile.java文件中的
saveMiniThumbToFile(byte[] data, long id, long magic)等函数
对于Android的Sqlite3数据库，_id是自增的。比如，最开始我插入了10001记录，这时最后一条记录的_id为10001,这时如果删除1到10000条记录，
再插入一条记录，那么这条的记录的_id值为10002.
因此，
随着用户日常中不停的向SD卡反复地添加删除文件，那么files表中的_id的值会不停的增大，
当该值为10万时，即使我们截屏时，系统只把该截屏图片这样一张图的缩略图保存在.thumbdata4--1967290299文件，
10万*BYTES_PER_MINTHUMB>1G,也就是说.thumbdata4--1967290299文件就会占用了1G多的SD空间。随着时间的推移，该值会继续变大，直到填满SD卡。
我们的方案就是把
.thumbdata4--1967290299
文件分成多个文件来存储缩略图。
比如.thumbdata4--1967290299-0存_id 为1到1024的文件的缩略图，.thumbdata4--1967290299-1存_id 为1025到2048的文件的缩略图
同时对缩略图文件做一些维护，即如果一个缩略图文件本身对应原文件不在时，清理掉该微缩略图文件。
另外在极端情况下（剩余容量小于100M下），清理掉所有的微缩略图文件。
在MTK 6575平台上对该问题的修改包含2个文件的修改：
<div><span class="pln"><span class="pln"> modified</span></span><span class="pun" style="color:#0;"><span class="pun">:</span></span><span class="pln"><span class="pln"> frameworks</span></span><span class="pun" style="color:#0;"><span class="pun">/</span></span><span class="kwd" style="color:#0;"><span class="kwd">base</span></span><span class="pun" style="color:#0;"><span class="pun">/</span></span><span class="pln"><span class="pln">media</span></span><span class="pun" style="color:#0;"><span class="pun">/</span></span><span class="pln"><span class="pln">java</span></span><span class="pun" style="color:#0;"><span class="pun">/</span></span><span class="pln"><span class="pln">android</span></span><span class="pun" style="color:#0;"><span class="pun">/</span></span><span class="pln"><span class="pln">media</span></span><span class="pun" style="color:#0;"><span class="pun">/</span></span><span class="typ" style="color:#0;"><span class="typ">MediaScanner</span></span><span class="pun" style="color:#0;"><span class="pun">.</span></span><span class="pln"><span class="pln">java</span></span></div><div><span class="pln"><span class="pln"> modified</span></span><span class="pun" style="color:#0;"><span class="pun">:</span></span><span class="pln"><span class="pln"> frameworks</span></span><span class="pun" style="color:#0;"><span class="pun">/</span></span><span class="kwd" style="color:#0;"><span class="kwd">base</span></span><span class="pun" style="color:#0;"><span class="pun">/</span></span><span class="pln"><span class="pln">media</span></span><span class="pun" style="color:#0;"><span class="pun">/</span></span><span class="pln"><span class="pln">java</span></span><span class="pun" style="color:#0;"><span class="pun">/</span></span><span class="pln"><span class="pln">android</span></span><span class="pun" style="color:#0;"><span class="pun">/</span></span><span class="pln"><span class="pln">media</span></span><span class="pun" style="color:#0;"><span class="pun">/</span></span><span class="typ" style="color:#0;"><span class="typ">MiniThumbFile</span></span><span class="pun" style="color:#0;"><span class="pun">.</span></span><span class="pln"><span class="pln">java</span></span></div>
MiniThumbFile.java文件的主要修改如下：
<div class="dp-highlighter bg_java" sizcache="27" sizset="60"><div class="bar" sizcache="27" sizset="60"><div class="tools" sizcache="27" sizset="60"><strong>[java]</strong> <a target=_blank title="view plain" class="ViewSource" href="http://blog.csdn.net/fengye810130/article/details/9118221#">view plain</a><a target=_blank title="copy" class="CopyToClipboard" href="http://blog.csdn.net/fengye810130/article/details/9118221#">copy</a><a target=_blank title="print" class="PrintSource" href="http://blog.csdn.net/fengye810130/article/details/9118221#">print</a><a target=_blank title="?" class="About" href="http://blog.csdn.net/fengye810130/article/details/9118221#">?</a></div></div><ol class="dp-j"><li class="alt"><span><span><PRE </span><span class="keyword">class</span><span>=java name=</span><span class="string">"code"</span><span>></span><span class="comment">/**</span> </span></li><li><span><span class="comment">@@ -85,16 +89,34 @@ public class MiniThumbFile {</span> </span></li><li class="alt"><span><span class="comment"> /*add 1 on google's version.*/</span><span> </span></span></li><li><span> </span><span class="comment">/*this version add check code for thumbdata.*/</span><span> </span></li><li class="alt"><span> </span><span class="keyword">private</span><span> </span><span class="keyword">static</span><span> </span><span class="keyword">final</span><span> </span><span class="keyword">int</span><span> MINI_THUMB_DATA_FILE_VERSION = </span><span class="number">3</span><span> + </span><span class="number">1</span><span>; </span></li><li><span> </span><span class="keyword">public</span><span> </span><span class="keyword">static</span><span> </span><span class="keyword">final</span><span> </span><span class="keyword">int</span><span> BYTES_PER_MINTHUMB = </span><span class="number">17000</span><span>; </span></li><li class="alt"><span> </span><span class="keyword">public</span><span> </span><span class="keyword">static</span><span> </span><span class="keyword">final</span><span> </span><span class="keyword">int</span><span> BYTES_PER_MINTHUMB = </span><span class="number">17000</span><span>; </span></li><li><span> </span><span class="keyword">private</span><span> </span><span class="keyword">static</span><span> </span><span class="keyword">final</span><span> </span><span class="keyword">int</span><span> HEADER_SIZE = </span><span class="number">1</span><span> + </span><span class="number">8</span><span> + </span><span class="number">4</span><span> + </span><span class="number">8</span><span>; </span></li><li class="alt"><span> </span><span class="keyword">private</span><span> Uri mUri; </span></li><li><span> </span><span class="keyword">private</span><span> RandomAccessFile mMiniThumbFile; </span></li><li class="alt"><span> Map<Long,RandomAccessFile> mMiniThumbFilesMap = Collections.synchronizedMap(</span><span class="keyword">new</span><span> HashMap<Long,RandomAccessFile>(</span><span class="number">5</span><span>)); </span></li><li><span> </span><span class="keyword">private</span><span> FileChannel mChannel; </span></li><li class="alt"><span> </span><span class="keyword">private</span><span> ByteBuffer mBuffer; </span></li><li><span> </span><span class="keyword">private</span><span> </span><span class="keyword">static</span><span> Hashtable<String, MiniThumbFile> sThumbFiles = </span></li><li class="alt"><span> </span><span class="keyword">new</span><span> Hashtable<String, MiniThumbFile>(); </span></li><li><span> </span><span class="keyword">private</span><span> </span><span class="keyword">static</span><span> java.util.zip.Adler32 sChecker = </span><span class="keyword">new</span><span> Adler32(); </span></li><li class="alt"><span> </span><span class="keyword">private</span><span> </span><span class="keyword">static</span><span> </span><span class="keyword">final</span><span> </span><span class="keyword">long</span><span> UNKNOWN_CHECK_CODE = -</span><span class="number">1</span><span>; </span></li><li><span> </span><span class="keyword">final</span><span> </span><span class="keyword">static</span><span> </span><span class="keyword">char</span><span> SEPERATE_CHAR=</span><span class="string">'_'</span><span>; </span></li><li class="alt"><span> </span><span class="keyword">public</span><span> </span><span class="keyword">static</span><span> String[] parseFileName(String fileName) </span></li><li><span> { </span></li><li class="alt"><span> String str=fileName; </span></li><li><span> </span><span class="keyword">if</span><span>(fileName==</span><span class="keyword">null</span><span>) </span></li><li class="alt"><span> </span><span class="keyword">return</span><span> </span><span class="keyword">null</span><span>; </span></li><li><span> </span><span class="keyword">int</span><span> index=fileName.lastIndexOf(</span><span class="string">"/"</span><span>); </span></li><li class="alt"><span> </span><span class="keyword">if</span><span>(index!=-</span><span class="number">1</span><span>) </span></li><li><span> { </span></li><li class="alt"><span> str=fileName.substring(index+</span><span class="number">1</span><span>); </span></li><li><span> } </span></li><li class="alt"><span> String strs[]=str.split(SEPERATE_CHAR+</span><span class="string">""</span><span>); </span></li><li><span> </span><span class="keyword">if</span><span>(strs==</span><span class="keyword">null</span><span>||strs.length!=</span><span class="number">4</span><span>||(!str.startsWith(</span><span class="string">".thumbdata"</span><span>))) </span></li><li class="alt"><span> { </span></li><li><span> </span><span class="keyword">return</span><span> </span><span class="keyword">null</span><span>; </span></li><li class="alt"><span> } </span></li><li><span> </span><span class="keyword">return</span><span> strs; </span></li><li class="alt"><span> } </span></li><li><span> </span><span class="comment">/**</span> </li><li class="alt"><span><span class="comment"> * We store different types of thumbnails in different files. To remain backward compatibility,</span> </span></li><li><span><span class="comment"> * we should hashcode of content://media/external/images/media remains the same.</span> </span></li><li class="alt"><span><span class="comment">@@ -105,7 +127,18 @@ public class MiniThumbFile {</span> </span></li><li><span><span class="comment"> }</span> </span></li><li class="alt"><span><span class="comment"> sThumbFiles.clear();</span> </span></li><li><span><span class="comment"> }</span> </span></li><li class="alt"><span><span class="comment"></span> </span></li><li><span><span class="comment"> private final static long getMiniThumbFileId(long id)</span> </span></li><li class="alt"><span><span class="comment"> {</span> </span></li><li><span><span class="comment"> return (id>>8);</span> </span></li><li class="alt"><span><span class="comment"> }</span> </span></li><li><span><span class="comment"> public final static int getMiniThumbDataFileBlockNum()</span> </span></li><li class="alt"><span><span class="comment"> {</span> </span></li><li><span><span class="comment"> return (1<<8);</span> </span></li><li class="alt"><span><span class="comment"> }</span> </span></li><li><span><span class="comment"> private final static long getPositionInMiniThumbFile(long id)</span> </span></li><li class="alt"><span><span class="comment"> {</span> </span></li><li><span><span class="comment"> return (id&0xff)*BYTES_PER_MINTHUMB;</span> </span></li><li class="alt"><span><span class="comment"> }</span> </span></li><li><span><span class="comment"> public static synchronized MiniThumbFile instance(Uri uri) {</span> </span></li><li class="alt"><span><span class="comment"> String type = uri.getPathSegments().get(1);</span> </span></li><li><span><span class="comment"> MiniThumbFile file = sThumbFiles.get(type);</span> </span></li><li class="alt"><span><span class="comment">@@ -120,10 +153,11 @@ public class MiniThumbFile {</span> </span></li><li><span><span class="comment"> }</span> </span></li><li class="alt"><span><span class="comment"> private String randomAccessFilePath(int version) {</span> </span></li><li><span><span class="comment"> String type = mUri.getPathSegments().get(1);</span> </span></li><li class="alt"><span><span class="comment"> String directoryName =</span> </span></li><li><span><span class="comment"> Environment.getExternalStorageDirectory().toString() + "/DCIM/.thumbnails";</span> </span></li><li class="alt"><span><span class="comment"> return directoryName + "/.thumbdata" + version + "-" + mUri.hashCode();</span> </span></li><li><span><span class="comment"> return directoryName + "/.thumbdata" + version + SEPERATE_CHAR + mUri.hashCode()+SEPERATE_CHAR+type;</span> </span></li><li class="alt"><span><span class="comment"> }</span> </span></li><li><span><span class="comment"> /**</span> </span></li><li class="alt"><span><span class="comment">@@ -131,18 +165,18 @@ public class MiniThumbFile {</span> </span></li><li><span><span class="comment"> * @param uri the Uri same as instance(Uri uri).</span> </span></li><li class="alt"><span><span class="comment"> * @return</span> </span></li><li><span><span class="comment"> */</span><span> </span></span></li><li class="alt"><span> </span><span class="keyword">public</span><span> </span><span class="keyword">static</span><span> String getThumbdataPath(Uri uri) { </span></li><li><span> </span><span class="comment">/*public static String getThumbdataPath(Uri uri) {</span> </li><li class="alt"><span><span class="comment"> String type = uri.getPathSegments().get(1);</span> </span></li><li><span><span class="comment"> Uri thumbFileUri = Uri.parse("content://media/external/" + type + "/media");</span> </span></li><li class="alt"><span><span class="comment"> String directoryName = Environment.getExternalStorageDirectory().toString()</span> </span></li><li><span><span class="comment"> + "/DCIM/.thumbnails";</span> </span></li><li class="alt"><span><span class="comment"> String path = directoryName + "/.thumbdata" + MINI_THUMB_DATA_FILE_VERSION + "-" + thumbFileUri.hashCode();</span> </span></li><li><span><span class="comment"> String path = directoryName + "/.thumbdata" + MINI_THUMB_DATA_FILE_VERSION +SEPERATE_CHAR + thumbFileUri.hashCode()+SEPERATE_CHAR+type;</span> </span></li><li class="alt"><span><span class="comment"> if (LOG) Log.i(TAG, "getThumbdataPath(" + uri + ") return " + path);</span> </span></li><li><span><span class="comment"> return path;</span> </span></li><li class="alt"><span><span class="comment"> }</span> </span></li><li><span><span class="comment"> }*/</span><span> </span></span></li><li class="alt"><span> </span><span class="keyword">private</span><span> </span><span class="keyword">void</span><span> removeOldFile() { </span></li><li><span> String oldPath = randomAccessFilePath(MINI_THUMB_DATA_FILE_VERSION - </span><span class="number">1</span><span>); </span></li><li class="alt"><span> </span><span class="keyword">private</span><span> </span><span class="keyword">void</span><span> removeOldMiniThumbDataFile(</span><span class="keyword">long</span><span> miniThumbDataFileId) { </span></li><li><span> String oldPath =getMiniThumbDataFilePath(MINI_THUMB_DATA_FILE_VERSION - </span><span class="number">1</span><span>,miniThumbDataFileId); </span></li><li class="alt"><span> File oldFile = </span><span class="keyword">new</span><span> File(oldPath); </span></li><li><span> </span><span class="keyword">if</span><span> (oldFile.exists()) { </span></li><li class="alt"><span> </span><span class="keyword">try</span><span> { </span></li><li><span>@@ -</span><span class="number">152</span><span>,</span><span class="number">35</span><span> +</span><span class="number">186</span><span>,</span><span class="number">43</span><span> @@ </span><span class="keyword">public</span><span> </span><span class="keyword">class</span><span> MiniThumbFile { </span></li><li class="alt"><span> } </span></li><li><span> } </span></li><li class="alt"><span> } </span></li><li><span> </span></li><li class="alt"><span> </span><span class="keyword">private</span><span> RandomAccessFile miniThumbDataFile() { </span></li><li><span> </span><span class="keyword">if</span><span> (mMiniThumbFile == </span><span class="keyword">null</span><span>) { </span></li><li class="alt"><span> removeOldFile(); </span></li><li><span> String path = randomAccessFilePath(MINI_THUMB_DATA_FILE_VERSION); </span></li><li class="alt"><span> File directory = </span><span class="keyword">new</span><span> File(path).getParentFile(); </span></li><li><span> </span><span class="keyword">if</span><span> (!directory.isDirectory()) { </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (!directory.mkdirs()) { </span></li><li><span> Log.e(TAG, </span><span class="string">"Unable to create .thumbnails directory "</span><span> </span></li><li class="alt"><span> + directory.toString()); </span></li><li><span> } </span></li><li class="alt"><span> } </span></li><li><span> </span><span class="keyword">final</span><span> </span><span class="keyword">private</span><span> String getMiniThumbDataFilePath(</span><span class="keyword">int</span><span> version,</span><span class="keyword">long</span><span> miniThumbDataFileId) </span></li><li class="alt"><span> { </span></li><li><span> </span><span class="keyword">return</span><span> randomAccessFilePath(version)+SEPERATE_CHAR+miniThumbDataFileId; </span></li><li class="alt"><span> } </span></li><li><span> </span><span class="keyword">private</span><span> RandomAccessFile miniThumbDataFile(</span><span class="keyword">final</span><span> </span><span class="keyword">long</span><span> miniThumbDataFileId) { </span></li><li class="alt"><span> </span><span class="keyword">return</span><span> miniThumbDataFile(miniThumbDataFileId,</span><span class="keyword">false</span><span>); </span></li><li><span> } </span></li><li class="alt"><span> </span><span class="keyword">private</span><span> RandomAccessFile miniThumbDataFile(</span><span class="keyword">final</span><span> </span><span class="keyword">long</span><span> miniThumbDataFileId,</span><span class="keyword">boolean</span><span> onlyRead) { </span></li><li><span> RandomAccessFile miniThumbFile=mMiniThumbFilesMap.get(miniThumbDataFileId); </span></li><li class="alt"><span> String path = getMiniThumbDataFilePath(MINI_THUMB_DATA_FILE_VERSION,miniThumbDataFileId); </span></li><li><span> File f = </span><span class="keyword">new</span><span> File(path); </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (miniThumbFile == </span><span class="keyword">null</span><span>||!f.exists()) { </span></li><li><span> </span><span class="keyword">if</span><span>(onlyRead) </span></li><li class="alt"><span> </span><span class="keyword">return</span><span> </span><span class="keyword">null</span><span>; </span></li><li><span> removeOldMiniThumbDataFile(miniThumbDataFileId); </span></li><li class="alt"><span> File directory = </span><span class="keyword">new</span><span> File(path).getParentFile(); </span></li><li><span> </span><span class="keyword">if</span><span> (!directory.isDirectory()) { </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (!directory.mkdirs()) { </span></li><li><span> Log.e(TAG, </span><span class="string">"Unable to create .thumbnails directory "</span><span> </span></li><li class="alt"><span> + directory.toString()); </span></li><li><span> } </span></li><li class="alt"><span> } </span></li><li><span> </span></li><li class="alt"><span> </span><span class="keyword">try</span><span> { </span></li><li><span> mMiniThumbFile = </span><span class="keyword">new</span><span> RandomAccessFile(f, </span><span class="string">"rw"</span><span>); </span></li><li class="alt"><span> miniThumbFile = </span><span class="keyword">new</span><span> RandomAccessFile(f, </span><span class="string">"rw"</span><span>); </span></li><li><span> } </span><span class="keyword">catch</span><span> (IOException ex) { </span></li><li class="alt"><span> </span><span class="comment">// Open as read-only so we can at least read the existing </span><span> </span></li><li><span> </span><span class="comment">// thumbnails. </span><span> </span></li><li class="alt"><span> </span><span class="keyword">try</span><span> { </span></li><li><span> mMiniThumbFile = </span><span class="keyword">new</span><span> RandomAccessFile(f, </span><span class="string">"r"</span><span>); </span></li><li class="alt"><span> miniThumbFile = </span><span class="keyword">new</span><span> RandomAccessFile(f, </span><span class="string">"r"</span><span>); </span></li><li><span> } </span><span class="keyword">catch</span><span> (IOException ex2) { </span></li><li class="alt"><span> } </span></li><li><span> } </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (mMiniThumbFile != </span><span class="keyword">null</span><span>) { </span></li><li><span> mChannel = mMiniThumbFile.getChannel(); </span></li><li class="alt"><span> } </span></li><li><span> mMiniThumbFilesMap.put(miniThumbDataFileId, miniThumbFile); </span></li><li class="alt"><span> } </span></li><li><span> </span><span class="keyword">return</span><span> mMiniThumbFile; </span></li><li class="alt"><span> </span><span class="keyword">return</span><span> miniThumbFile; </span></li><li><span> } </span></li><li class="alt"><span> </span><span class="keyword">public</span><span> MiniThumbFile(Uri uri) { </span></li><li><span>@@ -</span><span class="number">189</span><span>,</span><span class="number">10</span><span> +</span><span class="number">231</span><span>,</span><span class="number">19</span><span> @@ </span><span class="keyword">public</span><span> </span><span class="keyword">class</span><span> MiniThumbFile { </span></li><li class="alt"><span> } </span></li><li><span> </span><span class="keyword">public</span><span> </span><span class="keyword">synchronized</span><span> </span><span class="keyword">void</span><span> deactivate() { </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (mMiniThumbFile != </span><span class="keyword">null</span><span>) { </span></li><li><span> </span><span class="keyword">if</span><span> (mMiniThumbFilesMap != </span><span class="keyword">null</span><span>) { </span></li><li class="alt"><span> Set<Long> keySet=mMiniThumbFilesMap.keySet(); </span></li><li><span> </span><span class="keyword">try</span><span> { </span></li><li class="alt"><span> mMiniThumbFile.close(); </span></li><li><span> mMiniThumbFile = </span><span class="keyword">null</span><span>; </span></li><li class="alt"><span> </span><span class="keyword">for</span><span>(Long key:keySet) </span></li><li><span> { </span></li><li class="alt"><span> RandomAccessFile file=mMiniThumbFilesMap.get(key); </span></li><li><span> </span><span class="keyword">if</span><span>(file!=</span><span class="keyword">null</span><span>) </span></li><li class="alt"><span> { </span></li><li><span> mMiniThumbFilesMap.put(key, </span><span class="keyword">null</span><span>); </span></li><li class="alt"><span> file.close(); </span></li><li><span> } </span></li><li class="alt"><span> } </span></li><li><span> mMiniThumbFilesMap.clear(); </span></li><li class="alt"><span> } </span><span class="keyword">catch</span><span> (IOException ex) { </span></li><li><span> </span><span class="comment">// ignore exception </span><span> </span></li><li class="alt"><span> } </span></li><li><span>@@ -</span><span class="number">205</span><span>,</span><span class="number">18</span><span> +</span><span class="number">256</span><span>,</span><span class="number">20</span><span> @@ </span><span class="keyword">public</span><span> </span><span class="keyword">class</span><span> MiniThumbFile { </span></li><li class="alt"><span> </span><span class="comment">// check the mini thumb file for the right data. Right is </span><span> </span></li><li><span> </span><span class="comment">// defined as having the right magic number at the offset </span><span> </span></li><li class="alt"><span> </span><span class="comment">// reserved for this "id". </span><span> </span></li><li><span> RandomAccessFile r = miniThumbDataFile(); </span></li><li class="alt"><span> </span><span class="keyword">final</span><span> </span><span class="keyword">long</span><span> miniThumbDataFileId=getMiniThumbFileId(id); </span></li><li><span> RandomAccessFile r = miniThumbDataFile(miniThumbDataFileId,</span><span class="keyword">true</span><span>); </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (r != </span><span class="keyword">null</span><span>) { </span></li><li><span> </span><span class="keyword">long</span><span> pos = id * BYTES_PER_MINTHUMB; </span></li><li class="alt"><span> FileChannel channel=r.getChannel(); </span></li><li><span> </span><span class="keyword">long</span><span> pos = getPositionInMiniThumbFile(id); </span></li><li class="alt"><span> FileLock lock = </span><span class="keyword">null</span><span>; </span></li><li><span> </span><span class="keyword">try</span><span> { </span></li><li class="alt"><span> mBuffer.clear(); </span></li><li><span> mBuffer.limit(</span><span class="number">1</span><span> + </span><span class="number">8</span><span>); </span></li><li class="alt"><span> lock = mChannel.lock(pos, </span><span class="number">1</span><span> + </span><span class="number">8</span><span>, </span><span class="keyword">true</span><span>); </span></li><li><span> lock = channel.lock(pos, </span><span class="number">1</span><span> + </span><span class="number">8</span><span>, </span><span class="keyword">true</span><span>); </span></li><li class="alt"><span> </span><span class="comment">// check that we can read the following 9 bytes </span><span> </span></li><li><span> </span><span class="comment">// (1 for the "status" and 8 for the long) </span><span> </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (mChannel.read(mBuffer, pos) == </span><span class="number">9</span><span>) { </span></li><li><span> </span><span class="keyword">if</span><span> (channel.read(mBuffer, pos) == </span><span class="number">9</span><span>) { </span></li><li class="alt"><span> mBuffer.position(</span><span class="number">0</span><span>); </span></li><li><span> </span><span class="keyword">if</span><span> (mBuffer.get() == </span><span class="number">1</span><span>) { </span></li><li class="alt"><span> </span><span class="keyword">return</span><span> mBuffer.getLong(); </span></li><li><span>@@ -</span><span class="number">242</span><span>,</span><span class="number">10</span><span> +</span><span class="number">295</span><span>,</span><span class="number">12</span><span> @@ </span><span class="keyword">public</span><span> </span><span class="keyword">class</span><span> MiniThumbFile { </span></li><li class="alt"><span> </span><span class="keyword">public</span><span> </span><span class="keyword">synchronized</span><span> </span><span class="keyword">void</span><span> saveMiniThumbToFile(</span><span class="keyword">byte</span><span>[] data, </span><span class="keyword">long</span><span> id, </span><span class="keyword">long</span><span> magic) </span></li><li><span> </span><span class="keyword">throws</span><span> IOException { </span></li><li class="alt"><span> RandomAccessFile r = miniThumbDataFile(); </span></li><li><span> </span><span class="keyword">final</span><span> </span><span class="keyword">long</span><span> miniThumbDataFileId=getMiniThumbFileId(id); </span></li><li class="alt"><span> RandomAccessFile r = miniThumbDataFile(miniThumbDataFileId); </span></li><li><span> </span><span class="keyword">if</span><span> (r == </span><span class="keyword">null</span><span>) </span><span class="keyword">return</span><span>; </span></li><li class="alt"><span> </span><span class="keyword">long</span><span> pos = id * BYTES_PER_MINTHUMB; </span></li><li><span> </span><span class="keyword">final</span><span> </span><span class="keyword">long</span><span> pos = getPositionInMiniThumbFile(id); </span></li><li class="alt"><span> FileChannel channel=r.getChannel(); </span></li><li><span> FileLock lock = </span><span class="keyword">null</span><span>; </span></li><li class="alt"><span> </span><span class="keyword">try</span><span> { </span></li><li><span> </span><span class="keyword">if</span><span> (data != </span><span class="keyword">null</span><span>) { </span></li><li class="alt"><span>@@ -</span><span class="number">266</span><span>,</span><span class="number">14</span><span> +</span><span class="number">321</span><span>,</span><span class="number">13</span><span> @@ </span><span class="keyword">public</span><span> </span><span class="keyword">class</span><span> MiniThumbFile { </span></li><li><span> check = sChecker.getValue(); </span></li><li class="alt"><span> } </span></li><li><span> mBuffer.putLong(check); </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (LOG) Log.i(TAG, </span><span class="string">"saveMiniThumbToFile("</span><span> + id + </span><span class="string">") flag=1, magic="</span><span> </span></li><li><span> + magic + </span><span class="string">", length="</span><span> + data.length + </span><span class="string">", check="</span><span> + check); </span></li><li class="alt"><span> </span></li><li><span> mBuffer.put(data); </span></li><li class="alt"><span> mBuffer.flip(); </span></li><li><span> lock = mChannel.lock(pos, BYTES_PER_MINTHUMB, </span><span class="keyword">false</span><span>); </span></li><li class="alt"><span> mChannel.write(mBuffer, pos); </span></li><li><span> lock = channel.lock(pos, BYTES_PER_MINTHUMB, </span><span class="keyword">false</span><span>); </span></li><li class="alt"><span> channel.write(mBuffer, pos); </span></li><li><span> </span><span class="keyword">if</span><span> (LOG) Log.i(TAG, </span><span class="string">"saveMiniThumbToFile("</span><span> + id + </span><span class="string">") flag=1, magic="</span><span> </span></li><li class="alt"><span> + magic + </span><span class="string">", length="</span><span> + data.length + </span><span class="string">", check="</span><span> + check); </span></li><li><span> } </span></li><li class="alt"><span> } </span><span class="keyword">catch</span><span> (IOException ex) { </span></li><li><span> Log.e(TAG, </span><span class="string">"couldn't save mini thumbnail data for "</span><span> </span></li><li class="alt"><span>@@ -</span><span class="number">319</span><span>,</span><span class="number">27</span><span> +</span><span class="number">373</span><span>,</span><span class="number">29</span><span> @@ </span><span class="keyword">public</span><span> </span><span class="keyword">class</span><span> MiniThumbFile { </span></li><li><span> * </span><span class="annotation">@return</span><span> </span></li><li class="alt"><span> */ </span></li><li><span> </span><span class="keyword">public</span><span> </span><span class="keyword">synchronized</span><span> </span><span class="keyword">byte</span><span>[] getMiniThumbFromFile(</span><span class="keyword">long</span><span> id, </span><span class="keyword">byte</span><span> [] data, ThumbResult result) { </span></li><li class="alt"><span> RandomAccessFile r = miniThumbDataFile(); </span></li><li><span> </span><span class="keyword">final</span><span> </span><span class="keyword">long</span><span> miniThumbDataFileId=getMiniThumbFileId(id); </span></li><li class="alt"><span> RandomAccessFile r = miniThumbDataFile(miniThumbDataFileId,</span><span class="keyword">true</span><span>); </span></li><li><span> </span><span class="keyword">if</span><span> (r == </span><span class="keyword">null</span><span>) </span><span class="keyword">return</span><span> </span><span class="keyword">null</span><span>; </span></li><li class="alt"><span> </span><span class="keyword">long</span><span> pos = id * BYTES_PER_MINTHUMB; </span></li><li><span> </span><span class="keyword">long</span><span> pos = getPositionInMiniThumbFile(id); </span></li><li class="alt"><span> FileChannel channel=r.getChannel(); </span></li><li><span> FileLock lock = </span><span class="keyword">null</span><span>; </span></li><li class="alt"><span> </span><span class="keyword">try</span><span> { </span></li><li><span> mBuffer.clear(); </span></li><li class="alt"><span> lock = mChannel.lock(pos, BYTES_PER_MINTHUMB, </span><span class="keyword">true</span><span>); </span></li><li><span> </span><span class="keyword">int</span><span> size = mChannel.read(mBuffer, pos); </span></li><li class="alt"><span> lock = channel.lock(pos, BYTES_PER_MINTHUMB, </span><span class="keyword">true</span><span>); </span></li><li><span> </span><span class="keyword">int</span><span> size = channel.read(mBuffer, pos); </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (size > </span><span class="number">1</span><span> + </span><span class="number">8</span><span> + </span><span class="number">4</span><span> + </span><span class="number">8</span><span>) { </span><span class="comment">// flag, magic, length, check code </span><span> </span></li><li><span> mBuffer.position(</span><span class="number">0</span><span>); </span></li><li class="alt"><span> </span><span class="keyword">byte</span><span> flag = mBuffer.get(); </span></li><li><span> </span><span class="keyword">long</span><span> magic = mBuffer.getLong(); </span></li><li class="alt"><span> </span><span class="keyword">int</span><span> length = mBuffer.getInt(); </span></li><li><span> </span><span class="keyword">long</span><span> check = mBuffer.getLong(); </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (LOG) Log.i(TAG, </span><span class="string">"getMiniThumbFromFile("</span><span> + id + </span><span class="string">") flag="</span><span> + flag </span></li><li><span> + </span><span class="string">", magic="</span><span> + magic + </span><span class="string">", length="</span><span> + length + </span><span class="string">", check="</span><span> + check); </span></li><li class="alt"><span> </span></li><li><span> </span><span class="keyword">long</span><span> newCheck = UNKNOWN_CHECK_CODE; </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (size >= </span><span class="number">1</span><span> + </span><span class="number">8</span><span> + </span><span class="number">4</span><span> + </span><span class="number">8</span><span> + length && data.length >= length) { </span></li><li><span> mBuffer.get(data, </span><span class="number">0</span><span>, length); </span></li><li class="alt"><span> Log.i(TAG, </span><span class="string">" success to getMiniThumbFromFile("</span><span> + id + </span><span class="string">") flag="</span><span> + flag </span></li><li><span> + </span><span class="string">", magic="</span><span> + magic + </span><span class="string">", length="</span><span> + length + </span><span class="string">", check="</span><span> + check); </span></li><li class="alt"><span> </span><span class="keyword">synchronized</span><span> (sChecker) { </span></li><li><span> sChecker.reset(); </span></li><li class="alt"><span> sChecker.update(data, </span><span class="number">0</span><span>, length);</PRE><BR> </span></li></ol></div><pre class="java" style="DISPLAY: none" sizcache="27" sizset="64" name="code"><div class="dp-highlighter bg_java" sizcache="27" sizset="64"><div class="bar" sizcache="27" sizset="64"><div class="tools" sizcache="27" sizset="64"><strong>[java]</strong> <a target=_blank title="view plain" class="ViewSource" href="http://blog.csdn.net/fengye810130/article/details/9118221#">view plain</a><a target=_blank title="copy" class="CopyToClipboard" href="http://blog.csdn.net/fengye810130/article/details/9118221#">copy</a><a target=_blank title="print" class="PrintSource" href="http://blog.csdn.net/fengye810130/article/details/9118221#">print</a><a target=_blank title="?" class="About" href="http://blog.csdn.net/fengye810130/article/details/9118221#">?</a></div></div><ol class="dp-j"><li class="alt"><span><span class="comment">/**</span> </span></li><li><span><span class="comment">@@ -85,16 +89,34 @@ public class MiniThumbFile {</span> </span></li><li class="alt"><span><span class="comment"> /*add 1 on google's version.*/</span><span> </span></span></li><li><span> </span><span class="comment">/*this version add check code for thumbdata.*/</span><span> </span></li><li class="alt"><span> </span><span class="keyword">private</span><span> </span><span class="keyword">static</span><span> </span><span class="keyword">final</span><span> </span><span class="keyword">int</span><span> MINI_THUMB_DATA_FILE_VERSION = </span><span class="number">3</span><span> + </span><span class="number">1</span><span>; </span></li><li><span> </span><span class="keyword">public</span><span> </span><span class="keyword">static</span><span> </span><span class="keyword">final</span><span> </span><span class="keyword">int</span><span> BYTES_PER_MINTHUMB = </span><span class="number">17000</span><span>; </span></li><li class="alt"><span> </span><span class="keyword">public</span><span> </span><span class="keyword">static</span><span> </span><span class="keyword">final</span><span> </span><span class="keyword">int</span><span> BYTES_PER_MINTHUMB = </span><span class="number">17000</span><span>; </span></li><li><span> </span><span class="keyword">private</span><span> </span><span class="keyword">static</span><span> </span><span class="keyword">final</span><span> </span><span class="keyword">int</span><span> HEADER_SIZE = </span><span class="number">1</span><span> + </span><span class="number">8</span><span> + </span><span class="number">4</span><span> + </span><span class="number">8</span><span>; </span></li><li class="alt"><span> </span><span class="keyword">private</span><span> Uri mUri; </span></li><li><span> </span><span class="keyword">private</span><span> RandomAccessFile mMiniThumbFile; </span></li><li class="alt"><span> Map<Long,RandomAccessFile> mMiniThumbFilesMap = Collections.synchronizedMap(</span><span class="keyword">new</span><span> HashMap<Long,RandomAccessFile>(</span><span class="number">5</span><span>)); </span></li><li><span> </span><span class="keyword">private</span><span> FileChannel mChannel; </span></li><li class="alt"><span> </span><span class="keyword">private</span><span> ByteBuffer mBuffer; </span></li><li><span> </span><span class="keyword">private</span><span> </span><span class="keyword">static</span><span> Hashtable<String, MiniThumbFile> sThumbFiles = </span></li><li class="alt"><span> </span><span class="keyword">new</span><span> Hashtable<String, MiniThumbFile>(); </span></li><li><span> </span><span class="keyword">private</span><span> </span><span class="keyword">static</span><span> java.util.zip.Adler32 sChecker = </span><span class="keyword">new</span><span> Adler32(); </span></li><li class="alt"><span> </span><span class="keyword">private</span><span> </span><span class="keyword">static</span><span> </span><span class="keyword">final</span><span> </span><span class="keyword">long</span><span> UNKNOWN_CHECK_CODE = -</span><span class="number">1</span><span>; </span></li><li><span> </span><span class="keyword">final</span><span> </span><span class="keyword">static</span><span> </span><span class="keyword">char</span><span> SEPERATE_CHAR=</span><span class="string">'_'</span><span>; </span></li><li class="alt"><span> </span><span class="keyword">public</span><span> </span><span class="keyword">static</span><span> String[] parseFileName(String fileName) </span></li><li><span> { </span></li><li class="alt"><span> String str=fileName; </span></li><li><span> </span><span class="keyword">if</span><span>(fileName==</span><span class="keyword">null</span><span>) </span></li><li class="alt"><span> </span><span class="keyword">return</span><span> </span><span class="keyword">null</span><span>; </span></li><li><span> </span><span class="keyword">int</span><span> index=fileName.lastIndexOf(</span><span class="string">"/"</span><span>); </span></li><li class="alt"><span> </span><span class="keyword">if</span><span>(index!=-</span><span class="number">1</span><span>) </span></li><li><span> { </span></li><li class="alt"><span> str=fileName.substring(index+</span><span class="number">1</span><span>); </span></li><li><span> } </span></li><li class="alt"><span> String strs[]=str.split(SEPERATE_CHAR+</span><span class="string">""</span><span>); </span></li><li><span> </span><span class="keyword">if</span><span>(strs==</span><span class="keyword">null</span><span>||strs.length!=</span><span class="number">4</span><span>||(!str.startsWith(</span><span class="string">".thumbdata"</span><span>))) </span></li><li class="alt"><span> { </span></li><li><span> </span><span class="keyword">return</span><span> </span><span class="keyword">null</span><span>; </span></li><li class="alt"><span> } </span></li><li><span> </span><span class="keyword">return</span><span> strs; </span></li><li class="alt"><span> } </span></li><li><span> </span><span class="comment">/**</span> </li><li class="alt"><span><span class="comment"> * We store different types of thumbnails in different files. To remain backward compatibility,</span> </span></li><li><span><span class="comment"> * we should hashcode of content://media/external/images/media remains the same.</span> </span></li><li class="alt"><span><span class="comment">@@ -105,7 +127,18 @@ public class MiniThumbFile {</span> </span></li><li><span><span class="comment"> }</span> </span></li><li class="alt"><span><span class="comment"> sThumbFiles.clear();</span> </span></li><li><span><span class="comment"> }</span> </span></li><li class="alt"><span><span class="comment"></span> </span></li><li><span><span class="comment"> private final static long getMiniThumbFileId(long id)</span> </span></li><li class="alt"><span><span class="comment"> {</span> </span></li><li><span><span class="comment"> return (id>>8);</span> </span></li><li class="alt"><span><span class="comment"> }</span> </span></li><li><span><span class="comment"> public final static int getMiniThumbDataFileBlockNum()</span> </span></li><li class="alt"><span><span class="comment"> {</span> </span></li><li><span><span class="comment"> return (1<<8);</span> </span></li><li class="alt"><span><span class="comment"> }</span> </span></li><li><span><span class="comment"> private final static long getPositionInMiniThumbFile(long id)</span> </span></li><li class="alt"><span><span class="comment"> {</span> </span></li><li><span><span class="comment"> return (id&0xff)*BYTES_PER_MINTHUMB;</span> </span></li><li class="alt"><span><span class="comment"> }</span> </span></li><li><span><span class="comment"> public static synchronized MiniThumbFile instance(Uri uri) {</span> </span></li><li class="alt"><span><span class="comment"> String type = uri.getPathSegments().get(1);</span> </span></li><li><span><span class="comment"> MiniThumbFile file = sThumbFiles.get(type);</span> </span></li><li class="alt"><span><span class="comment">@@ -120,10 +153,11 @@ public class MiniThumbFile {</span> </span></li><li><span><span class="comment"> }</span> </span></li><li class="alt"><span><span class="comment"> private String randomAccessFilePath(int version) {</span> </span></li><li><span><span class="comment"> String type = mUri.getPathSegments().get(1);</span> </span></li><li class="alt"><span><span class="comment"> String directoryName =</span> </span></li><li><span><span class="comment"> Environment.getExternalStorageDirectory().toString() + "/DCIM/.thumbnails";</span> </span></li><li class="alt"><span><span class="comment"> return directoryName + "/.thumbdata" + version + "-" + mUri.hashCode();</span> </span></li><li><span><span class="comment"> return directoryName + "/.thumbdata" + version + SEPERATE_CHAR + mUri.hashCode()+SEPERATE_CHAR+type;</span> </span></li><li class="alt"><span><span class="comment"> }</span> </span></li><li><span><span class="comment"> /**</span> </span></li><li class="alt"><span><span class="comment">@@ -131,18 +165,18 @@ public class MiniThumbFile {</span> </span></li><li><span><span class="comment"> * @param uri the Uri same as instance(Uri uri).</span> </span></li><li class="alt"><span><span class="comment"> * @return</span> </span></li><li><span><span class="comment"> */</span><span> </span></span></li><li class="alt"><span> </span><span class="keyword">public</span><span> </span><span class="keyword">static</span><span> String getThumbdataPath(Uri uri) { </span></li><li><span> </span><span class="comment">/*public static String getThumbdataPath(Uri uri) {</span> </li><li class="alt"><span><span class="comment"> String type = uri.getPathSegments().get(1);</span> </span></li><li><span><span class="comment"> Uri thumbFileUri = Uri.parse("content://media/external/" + type + "/media");</span> </span></li><li class="alt"><span><span class="comment"> String directoryName = Environment.getExternalStorageDirectory().toString()</span> </span></li><li><span><span class="comment"> + "/DCIM/.thumbnails";</span> </span></li><li class="alt"><span><span class="comment"> String path = directoryName + "/.thumbdata" + MINI_THUMB_DATA_FILE_VERSION + "-" + thumbFileUri.hashCode();</span> </span></li><li><span><span class="comment"> String path = directoryName + "/.thumbdata" + MINI_THUMB_DATA_FILE_VERSION +SEPERATE_CHAR + thumbFileUri.hashCode()+SEPERATE_CHAR+type;</span> </span></li><li class="alt"><span><span class="comment"> if (LOG) Log.i(TAG, "getThumbdataPath(" + uri + ") return " + path);</span> </span></li><li><span><span class="comment"> return path;</span> </span></li><li class="alt"><span><span class="comment"> }</span> </span></li><li><span><span class="comment"> }*/</span><span> </span></span></li><li class="alt"><span> </span><span class="keyword">private</span><span> </span><span class="keyword">void</span><span> removeOldFile() { </span></li><li><span> String oldPath = randomAccessFilePath(MINI_THUMB_DATA_FILE_VERSION - </span><span class="number">1</span><span>); </span></li><li class="alt"><span> </span><span class="keyword">private</span><span> </span><span class="keyword">void</span><span> removeOldMiniThumbDataFile(</span><span class="keyword">long</span><span> miniThumbDataFileId) { </span></li><li><span> String oldPath =getMiniThumbDataFilePath(MINI_THUMB_DATA_FILE_VERSION - </span><span class="number">1</span><span>,miniThumbDataFileId); </span></li><li class="alt"><span> File oldFile = </span><span class="keyword">new</span><span> File(oldPath); </span></li><li><span> </span><span class="keyword">if</span><span> (oldFile.exists()) { </span></li><li class="alt"><span> </span><span class="keyword">try</span><span> { </span></li><li><span>@@ -</span><span class="number">152</span><span>,</span><span class="number">35</span><span> +</span><span class="number">186</span><span>,</span><span class="number">43</span><span> @@ </span><span class="keyword">public</span><span> </span><span class="keyword">class</span><span> MiniThumbFile { </span></li><li class="alt"><span> } </span></li><li><span> } </span></li><li class="alt"><span> } </span></li><li><span> </span></li><li class="alt"><span> </span><span class="keyword">private</span><span> RandomAccessFile miniThumbDataFile() { </span></li><li><span> </span><span class="keyword">if</span><span> (mMiniThumbFile == </span><span class="keyword">null</span><span>) { </span></li><li class="alt"><span> removeOldFile(); </span></li><li><span> String path = randomAccessFilePath(MINI_THUMB_DATA_FILE_VERSION); </span></li><li class="alt"><span> File directory = </span><span class="keyword">new</span><span> File(path).getParentFile(); </span></li><li><span> </span><span class="keyword">if</span><span> (!directory.isDirectory()) { </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (!directory.mkdirs()) { </span></li><li><span> Log.e(TAG, </span><span class="string">"Unable to create .thumbnails directory "</span><span> </span></li><li class="alt"><span> + directory.toString()); </span></li><li><span> } </span></li><li class="alt"><span> } </span></li><li><span> </span><span class="keyword">final</span><span> </span><span class="keyword">private</span><span> String getMiniThumbDataFilePath(</span><span class="keyword">int</span><span> version,</span><span class="keyword">long</span><span> miniThumbDataFileId) </span></li><li class="alt"><span> { </span></li><li><span> </span><span class="keyword">return</span><span> randomAccessFilePath(version)+SEPERATE_CHAR+miniThumbDataFileId; </span></li><li class="alt"><span> } </span></li><li><span> </span><span class="keyword">private</span><span> RandomAccessFile miniThumbDataFile(</span><span class="keyword">final</span><span> </span><span class="keyword">long</span><span> miniThumbDataFileId) { </span></li><li class="alt"><span> </span><span class="keyword">return</span><span> miniThumbDataFile(miniThumbDataFileId,</span><span class="keyword">false</span><span>); </span></li><li><span> } </span></li><li class="alt"><span> </span><span class="keyword">private</span><span> RandomAccessFile miniThumbDataFile(</span><span class="keyword">final</span><span> </span><span class="keyword">long</span><span> miniThumbDataFileId,</span><span class="keyword">boolean</span><span> onlyRead) { </span></li><li><span> RandomAccessFile miniThumbFile=mMiniThumbFilesMap.get(miniThumbDataFileId); </span></li><li class="alt"><span> String path = getMiniThumbDataFilePath(MINI_THUMB_DATA_FILE_VERSION,miniThumbDataFileId); </span></li><li><span> File f = </span><span class="keyword">new</span><span> File(path); </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (miniThumbFile == </span><span class="keyword">null</span><span>||!f.exists()) { </span></li><li><span> </span><span class="keyword">if</span><span>(onlyRead) </span></li><li class="alt"><span> </span><span class="keyword">return</span><span> </span><span class="keyword">null</span><span>; </span></li><li><span> removeOldMiniThumbDataFile(miniThumbDataFileId); </span></li><li class="alt"><span> File directory = </span><span class="keyword">new</span><span> File(path).getParentFile(); </span></li><li><span> </span><span class="keyword">if</span><span> (!directory.isDirectory()) { </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (!directory.mkdirs()) { </span></li><li><span> Log.e(TAG, </span><span class="string">"Unable to create .thumbnails directory "</span><span> </span></li><li class="alt"><span> + directory.toString()); </span></li><li><span> } </span></li><li class="alt"><span> } </span></li><li><span> </span></li><li class="alt"><span> </span><span class="keyword">try</span><span> { </span></li><li><span> mMiniThumbFile = </span><span class="keyword">new</span><span> RandomAccessFile(f, </span><span class="string">"rw"</span><span>); </span></li><li class="alt"><span> miniThumbFile = </span><span class="keyword">new</span><span> RandomAccessFile(f, </span><span class="string">"rw"</span><span>); </span></li><li><span> } </span><span class="keyword">catch</span><span> (IOException ex) { </span></li><li class="alt"><span> </span><span class="comment">// Open as read-only so we can at least read the existing </span><span> </span></li><li><span> </span><span class="comment">// thumbnails. </span><span> </span></li><li class="alt"><span> </span><span class="keyword">try</span><span> { </span></li><li><span> mMiniThumbFile = </span><span class="keyword">new</span><span> RandomAccessFile(f, </span><span class="string">"r"</span><span>); </span></li><li class="alt"><span> miniThumbFile = </span><span class="keyword">new</span><span> RandomAccessFile(f, </span><span class="string">"r"</span><span>); </span></li><li><span> } </span><span class="keyword">catch</span><span> (IOException ex2) { </span></li><li class="alt"><span> } </span></li><li><span> } </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (mMiniThumbFile != </span><span class="keyword">null</span><span>) { </span></li><li><span> mChannel = mMiniThumbFile.getChannel(); </span></li><li class="alt"><span> } </span></li><li><span> mMiniThumbFilesMap.put(miniThumbDataFileId, miniThumbFile); </span></li><li class="alt"><span> } </span></li><li><span> </span><span class="keyword">return</span><span> mMiniThumbFile; </span></li><li class="alt"><span> </span><span class="keyword">return</span><span> miniThumbFile; </span></li><li><span> } </span></li><li class="alt"><span> </span><span class="keyword">public</span><span> MiniThumbFile(Uri uri) { </span></li><li><span>@@ -</span><span class="number">189</span><span>,</span><span class="number">10</span><span> +</span><span class="number">231</span><span>,</span><span class="number">19</span><span> @@ </span><span class="keyword">public</span><span> </span><span class="keyword">class</span><span> MiniThumbFile { </span></li><li class="alt"><span> } </span></li><li><span> </span><span class="keyword">public</span><span> </span><span class="keyword">synchronized</span><span> </span><span class="keyword">void</span><span> deactivate() { </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (mMiniThumbFile != </span><span class="keyword">null</span><span>) { </span></li><li><span> </span><span class="keyword">if</span><span> (mMiniThumbFilesMap != </span><span class="keyword">null</span><span>) { </span></li><li class="alt"><span> Set<Long> keySet=mMiniThumbFilesMap.keySet(); </span></li><li><span> </span><span class="keyword">try</span><span> { </span></li><li class="alt"><span> mMiniThumbFile.close(); </span></li><li><span> mMiniThumbFile = </span><span class="keyword">null</span><span>; </span></li><li class="alt"><span> </span><span class="keyword">for</span><span>(Long key:keySet) </span></li><li><span> { </span></li><li class="alt"><span> RandomAccessFile file=mMiniThumbFilesMap.get(key); </span></li><li><span> </span><span class="keyword">if</span><span>(file!=</span><span class="keyword">null</span><span>) </span></li><li class="alt"><span> { </span></li><li><span> mMiniThumbFilesMap.put(key, </span><span class="keyword">null</span><span>); </span></li><li class="alt"><span> file.close(); </span></li><li><span> } </span></li><li class="alt"><span> } </span></li><li><span> mMiniThumbFilesMap.clear(); </span></li><li class="alt"><span> } </span><span class="keyword">catch</span><span> (IOException ex) { </span></li><li><span> </span><span class="comment">// ignore exception </span><span> </span></li><li class="alt"><span> } </span></li><li><span>@@ -</span><span class="number">205</span><span>,</span><span class="number">18</span><span> +</span><span class="number">256</span><span>,</span><span class="number">20</span><span> @@ </span><span class="keyword">public</span><span> </span><span class="keyword">class</span><span> MiniThumbFile { </span></li><li class="alt"><span> </span><span class="comment">// check the mini thumb file for the right data. Right is </span><span> </span></li><li><span> </span><span class="comment">// defined as having the right magic number at the offset </span><span> </span></li><li class="alt"><span> </span><span class="comment">// reserved for this "id". </span><span> </span></li><li><span> RandomAccessFile r = miniThumbDataFile(); </span></li><li class="alt"><span> </span><span class="keyword">final</span><span> </span><span class="keyword">long</span><span> miniThumbDataFileId=getMiniThumbFileId(id); </span></li><li><span> RandomAccessFile r = miniThumbDataFile(miniThumbDataFileId,</span><span class="keyword">true</span><span>); </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (r != </span><span class="keyword">null</span><span>) { </span></li><li><span> </span><span class="keyword">long</span><span> pos = id * BYTES_PER_MINTHUMB; </span></li><li class="alt"><span> FileChannel channel=r.getChannel(); </span></li><li><span> </span><span class="keyword">long</span><span> pos = getPositionInMiniThumbFile(id); </span></li><li class="alt"><span> FileLock lock = </span><span class="keyword">null</span><span>; </span></li><li><span> </span><span class="keyword">try</span><span> { </span></li><li class="alt"><span> mBuffer.clear(); </span></li><li><span> mBuffer.limit(</span><span class="number">1</span><span> + </span><span class="number">8</span><span>); </span></li><li class="alt"><span> lock = mChannel.lock(pos, </span><span class="number">1</span><span> + </span><span class="number">8</span><span>, </span><span class="keyword">true</span><span>); </span></li><li><span> lock = channel.lock(pos, </span><span class="number">1</span><span> + </span><span class="number">8</span><span>, </span><span class="keyword">true</span><span>); </span></li><li class="alt"><span> </span><span class="comment">// check that we can read the following 9 bytes </span><span> </span></li><li><span> </span><span class="comment">// (1 for the "status" and 8 for the long) </span><span> </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (mChannel.read(mBuffer, pos) == </span><span class="number">9</span><span>) { </span></li><li><span> </span><span class="keyword">if</span><span> (channel.read(mBuffer, pos) == </span><span class="number">9</span><span>) { </span></li><li class="alt"><span> mBuffer.position(</span><span class="number">0</span><span>); </span></li><li><span> </span><span class="keyword">if</span><span> (mBuffer.get() == </span><span class="number">1</span><span>) { </span></li><li class="alt"><span> </span><span class="keyword">return</span><span> mBuffer.getLong(); </span></li><li><span>@@ -</span><span class="number">242</span><span>,</span><span class="number">10</span><span> +</span><span class="number">295</span><span>,</span><span class="number">12</span><span> @@ </span><span class="keyword">public</span><span> </span><span class="keyword">class</span><span> MiniThumbFile { </span></li><li class="alt"><span> </span><span class="keyword">public</span><span> </span><span class="keyword">synchronized</span><span> </span><span class="keyword">void</span><span> saveMiniThumbToFile(</span><span class="keyword">byte</span><span>[] data, </span><span class="keyword">long</span><span> id, </span><span class="keyword">long</span><span> magic) </span></li><li><span> </span><span class="keyword">throws</span><span> IOException { </span></li><li class="alt"><span> RandomAccessFile r = miniThumbDataFile(); </span></li><li><span> </span><span class="keyword">final</span><span> </span><span class="keyword">long</span><span> miniThumbDataFileId=getMiniThumbFileId(id); </span></li><li class="alt"><span> RandomAccessFile r = miniThumbDataFile(miniThumbDataFileId); </span></li><li><span> </span><span class="keyword">if</span><span> (r == </span><span class="keyword">null</span><span>) </span><span class="keyword">return</span><span>; </span></li><li class="alt"><span> </span><span class="keyword">long</span><span> pos = id * BYTES_PER_MINTHUMB; </span></li><li><span> </span><span class="keyword">final</span><span> </span><span class="keyword">long</span><span> pos = getPositionInMiniThumbFile(id); </span></li><li class="alt"><span> FileChannel channel=r.getChannel(); </span></li><li><span> FileLock lock = </span><span class="keyword">null</span><span>; </span></li><li class="alt"><span> </span><span class="keyword">try</span><span> { </span></li><li><span> </span><span class="keyword">if</span><span> (data != </span><span class="keyword">null</span><span>) { </span></li><li class="alt"><span>@@ -</span><span class="number">266</span><span>,</span><span class="number">14</span><span> +</span><span class="number">321</span><span>,</span><span class="number">13</span><span> @@ </span><span class="keyword">public</span><span> </span><span class="keyword">class</span><span> MiniThumbFile { </span></li><li><span> check = sChecker.getValue(); </span></li><li class="alt"><span> } </span></li><li><span> mBuffer.putLong(check); </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (LOG) Log.i(TAG, </span><span class="string">"saveMiniThumbToFile("</span><span> + id + </span><span class="string">") flag=1, magic="</span><span> </span></li><li><span> + magic + </span><span class="string">", length="</span><span> + data.length + </span><span class="string">", check="</span><span> + check); </span></li><li class="alt"><span> </span></li><li><span> mBuffer.put(data); </span></li><li class="alt"><span> mBuffer.flip(); </span></li><li><span> lock = mChannel.lock(pos, BYTES_PER_MINTHUMB, </span><span class="keyword">false</span><span>); </span></li><li class="alt"><span> mChannel.write(mBuffer, pos); </span></li><li><span> lock = channel.lock(pos, BYTES_PER_MINTHUMB, </span><span class="keyword">false</span><span>); </span></li><li class="alt"><span> channel.write(mBuffer, pos); </span></li><li><span> </span><span class="keyword">if</span><span> (LOG) Log.i(TAG, </span><span class="string">"saveMiniThumbToFile("</span><span> + id + </span><span class="string">") flag=1, magic="</span><span> </span></li><li class="alt"><span> + magic + </span><span class="string">", length="</span><span> + data.length + </span><span class="string">", check="</span><span> + check); </span></li><li><span> } </span></li><li class="alt"><span> } </span><span class="keyword">catch</span><span> (IOException ex) { </span></li><li><span> Log.e(TAG, </span><span class="string">"couldn't save mini thumbnail data for "</span><span> </span></li><li class="alt"><span>@@ -</span><span class="number">319</span><span>,</span><span class="number">27</span><span> +</span><span class="number">373</span><span>,</span><span class="number">29</span><span> @@ </span><span class="keyword">public</span><span> </span><span class="keyword">class</span><span> MiniThumbFile { </span></li><li><span> * </span><span class="annotation">@return</span><span> </span></li><li class="alt"><span> */ </span></li><li><span> </span><span class="keyword">public</span><span> </span><span class="keyword">synchronized</span><span> </span><span class="keyword">byte</span><span>[] getMiniThumbFromFile(</span><span class="keyword">long</span><span> id, </span><span class="keyword">byte</span><span> [] data, ThumbResult result) { </span></li><li class="alt"><span> RandomAccessFile r = miniThumbDataFile(); </span></li><li><span> </span><span class="keyword">final</span><span> </span><span class="keyword">long</span><span> miniThumbDataFileId=getMiniThumbFileId(id); </span></li><li class="alt"><span> RandomAccessFile r = miniThumbDataFile(miniThumbDataFileId,</span><span class="keyword">true</span><span>); </span></li><li><span> </span><span class="keyword">if</span><span> (r == </span><span class="keyword">null</span><span>) </span><span class="keyword">return</span><span> </span><span class="keyword">null</span><span>; </span></li><li class="alt"><span> </span><span class="keyword">long</span><span> pos = id * BYTES_PER_MINTHUMB; </span></li><li><span> </span><span class="keyword">long</span><span> pos = getPositionInMiniThumbFile(id); </span></li><li class="alt"><span> FileChannel channel=r.getChannel(); </span></li><li><span> FileLock lock = </span><span class="keyword">null</span><span>; </span></li><li class="alt"><span> </span><span class="keyword">try</span><span> { </span></li><li><span> mBuffer.clear(); </span></li><li class="alt"><span> lock = mChannel.lock(pos, BYTES_PER_MINTHUMB, </span><span class="keyword">true</span><span>); </span></li><li><span> </span><span class="keyword">int</span><span> size = mChannel.read(mBuffer, pos); </span></li><li class="alt"><span> lock = channel.lock(pos, BYTES_PER_MINTHUMB, </span><span class="keyword">true</span><span>); </span></li><li><span> </span><span class="keyword">int</span><span> size = channel.read(mBuffer, pos); </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (size > </span><span class="number">1</span><span> + </span><span class="number">8</span><span> + </span><span class="number">4</span><span> + </span><span class="number">8</span><span>) { </span><span class="comment">// flag, magic, length, check code </span><span> </span></li><li><span> mBuffer.position(</span><span class="number">0</span><span>); </span></li><li class="alt"><span> </span><span class="keyword">byte</span><span> flag = mBuffer.get(); </span></li><li><span> </span><span class="keyword">long</span><span> magic = mBuffer.getLong(); </span></li><li class="alt"><span> </span><span class="keyword">int</span><span> length = mBuffer.getInt(); </span></li><li><span> </span><span class="keyword">long</span><span> check = mBuffer.getLong(); </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (LOG) Log.i(TAG, </span><span class="string">"getMiniThumbFromFile("</span><span> + id + </span><span class="string">") flag="</span><span> + flag </span></li><li><span> + </span><span class="string">", magic="</span><span> + magic + </span><span class="string">", length="</span><span> + length + </span><span class="string">", check="</span><span> + check); </span></li><li class="alt"><span> </span></li><li><span> </span><span class="keyword">long</span><span> newCheck = UNKNOWN_CHECK_CODE; </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (size >= </span><span class="number">1</span><span> + </span><span class="number">8</span><span> + </span><span class="number">4</span><span> + </span><span class="number">8</span><span> + length && data.length >= length) { </span></li><li><span> mBuffer.get(data, </span><span class="number">0</span><span>, length); </span></li><li class="alt"><span> Log.i(TAG, </span><span class="string">" success to getMiniThumbFromFile("</span><span> + id + </span><span class="string">") flag="</span><span> + flag </span></li><li><span> + </span><span class="string">", magic="</span><span> + magic + </span><span class="string">", length="</span><span> + length + </span><span class="string">", check="</span><span> + check); </span></li><li class="alt"><span> </span><span class="keyword">synchronized</span><span> (sChecker) { </span></li><li><span> sChecker.reset(); </span></li><li class="alt"><span> sChecker.update(data, </span><span class="number">0</span><span>, length); </span></li></ol></div><pre class="java" style="DISPLAY: none" name="code">/**
@@ -85,16 +89,34 @@ public class MiniThumbFile {
/*add 1 on google's version.*/
/*this version add check code for thumbdata.*/
private static final int MINI_THUMB_DATA_FILE_VERSION = 3 + 1;
public static final int BYTES_PER_MINTHUMB = 17000;
public static final int BYTES_PER_MINTHUMB = 17000;
private static final int HEADER_SIZE = 1 + 8 + 4 + 8;
private Uri mUri;
private RandomAccessFile mMiniThumbFile;
Map<Long,RandomAccessFile> mMiniThumbFilesMap = Collections.synchronizedMap(new HashMap<Long,RandomAccessFile>(5));
private FileChannel mChannel;
private ByteBuffer mBuffer;
private static Hashtable<String, MiniThumbFile> sThumbFiles =
new Hashtable<String, MiniThumbFile>();
private static java.util.zip.Adler32 sChecker = new Adler32();
private static final long UNKNOWN_CHECK_CODE = -1;
final static char SEPERATE_CHAR='_';
public static String[] parseFileName(String fileName)
{
String str=fileName;
if(fileName==null)
return null;
int index=fileName.lastIndexOf("/");
if(index!=-1)
{
str=fileName.substring(index+1);
}
String strs[]=str.split(SEPERATE_CHAR+"");
if(strs==null||strs.length!=4||(!str.startsWith(".thumbdata")))
{
return null;
}
return strs;
}
/**
* We store different types of thumbnails in different files. To remain backward compatibility,
* we should hashcode of content://media/external/images/media remains the same.
@@ -105,7 +127,18 @@ public class MiniThumbFile {
}
sThumbFiles.clear();
}
private final static long getMiniThumbFileId(long id)
{
return (id>>8);
}
public final static int getMiniThumbDataFileBlockNum()
{
return (1<<8);
}
private final static long getPositionInMiniThumbFile(long id)
{
return (id&0xff)*BYTES_PER_MINTHUMB;
}
public static synchronized MiniThumbFile instance(Uri uri) {
String type = uri.getPathSegments().get(1);
MiniThumbFile file = sThumbFiles.get(type);
@@ -120,10 +153,11 @@ public class MiniThumbFile {
}
private String randomAccessFilePath(int version) {
String type = mUri.getPathSegments().get(1);
String directoryName =
Environment.getExternalStorageDirectory().toString() + "/DCIM/.thumbnails";
return directoryName + "/.thumbdata" + version + "-" + mUri.hashCode();
return directoryName + "/.thumbdata" + version + SEPERATE_CHAR + mUri.hashCode()+SEPERATE_CHAR+type;
}
/**
@@ -131,18 +165,18 @@ public class MiniThumbFile {
* @param uri the Uri same as instance(Uri uri).
* @return
*/
public static String getThumbdataPath(Uri uri) {
/*public static String getThumbdataPath(Uri uri) {
String type = uri.getPathSegments().get(1);
Uri thumbFileUri = Uri.parse("content://media/external/" + type + "/media");
String directoryName = Environment.getExternalStorageDirectory().toString()
+ "/DCIM/.thumbnails";
String path = directoryName + "/.thumbdata" + MINI_THUMB_DATA_FILE_VERSION + "-" + thumbFileUri.hashCode();
String path = directoryName + "/.thumbdata" + MINI_THUMB_DATA_FILE_VERSION +SEPERATE_CHAR + thumbFileUri.hashCode()+SEPERATE_CHAR+type;
if (LOG) Log.i(TAG, "getThumbdataPath(" + uri + ") return " + path);
return path;
}
}*/
private void removeOldFile() {
String oldPath = randomAccessFilePath(MINI_THUMB_DATA_FILE_VERSION - 1);
private void removeOldMiniThumbDataFile(long miniThumbDataFileId) {
String oldPath =getMiniThumbDataFilePath(MINI_THUMB_DATA_FILE_VERSION - 1,miniThumbDataFileId);
File oldFile = new File(oldPath);
if (oldFile.exists()) {
try {
@@ -152,35 +186,43 @@ public class MiniThumbFile {
}
}
}
private RandomAccessFile miniThumbDataFile() {
if (mMiniThumbFile == null) {
removeOldFile();
String path = randomAccessFilePath(MINI_THUMB_DATA_FILE_VERSION);
File directory = new File(path).getParentFile();
if (!directory.isDirectory()) {
if (!directory.mkdirs()) {
Log.e(TAG, "Unable to create .thumbnails directory "
+ directory.toString());
}
}
final private String getMiniThumbDataFilePath(int version,long miniThumbDataFileId)
{
return randomAccessFilePath(version)+SEPERATE_CHAR+miniThumbDataFileId;
}
private RandomAccessFile miniThumbDataFile(final long miniThumbDataFileId) {
return miniThumbDataFile(miniThumbDataFileId,false);
}
private RandomAccessFile miniThumbDataFile(final long miniThumbDataFileId,boolean onlyRead) {
RandomAccessFile miniThumbFile=mMiniThumbFilesMap.get(miniThumbDataFileId);
String path = getMiniThumbDataFilePath(MINI_THUMB_DATA_FILE_VERSION,miniThumbDataFileId);
File f = new File(path);
if (miniThumbFile == null||!f.exists()) {
if(onlyRead)
return null;
removeOldMiniThumbDataFile(miniThumbDataFileId);
File directory = new File(path).getParentFile();
if (!directory.isDirectory()) {
if (!directory.mkdirs()) {
Log.e(TAG, "Unable to create .thumbnails directory "
+ directory.toString());
}
}
try {
mMiniThumbFile = new RandomAccessFile(f, "rw");
miniThumbFile = new RandomAccessFile(f, "rw");
} catch (IOException ex) {
// Open as read-only so we can at least read the existing
// thumbnails.
try {
mMiniThumbFile = new RandomAccessFile(f, "r");
miniThumbFile = new RandomAccessFile(f, "r");
} catch (IOException ex2) {
}
}
if (mMiniThumbFile != null) {
mChannel = mMiniThumbFile.getChannel();
}
mMiniThumbFilesMap.put(miniThumbDataFileId, miniThumbFile);
}
return mMiniThumbFile;
return miniThumbFile;
}
public MiniThumbFile(Uri uri) {
@@ -189,10 +231,19 @@ public class MiniThumbFile {
}
public synchronized void deactivate() {
if (mMiniThumbFile != null) {
if (mMiniThumbFilesMap != null) {
Set<Long> keySet=mMiniThumbFilesMap.keySet();
try {
mMiniThumbFile.close();
mMiniThumbFile = null;
for(Long key:keySet)
{
RandomAccessFile file=mMiniThumbFilesMap.get(key);
if(file!=null)
{
mMiniThumbFilesMap.put(key, null);
file.close();
}
}
mMiniThumbFilesMap.clear();
} catch (IOException ex) {
// ignore exception
}
@@ -205,18 +256,20 @@ public class MiniThumbFile {
// check the mini thumb file for the right data. Right is
// defined as having the right magic number at the offset
// reserved for this "id".
RandomAccessFile r = miniThumbDataFile();
final long miniThumbDataFileId=getMiniThumbFileId(id);
RandomAccessFile r = miniThumbDataFile(miniThumbDataFileId,true);
if (r != null) {
long pos = id * BYTES_PER_MINTHUMB;
FileChannel channel=r.getChannel();
long pos = getPositionInMiniThumbFile(id);
FileLock lock = null;
try {
mBuffer.clear();
mBuffer.limit(1 + 8);
lock = mChannel.lock(pos, 1 + 8, true);
lock = channel.lock(pos, 1 + 8, true);
// check that we can read the following 9 bytes
// (1 for the "status" and 8 for the long)
if (mChannel.read(mBuffer, pos) == 9) {
if (channel.read(mBuffer, pos) == 9) {
mBuffer.position(0);
if (mBuffer.get() == 1) {
return mBuffer.getLong();
@@ -242,10 +295,12 @@ public class MiniThumbFile {
public synchronized void saveMiniThumbToFile(byte[] data, long id, long magic)
throws IOException {
RandomAccessFile r = miniThumbDataFile();
final long miniThumbDataFileId=getMiniThumbFileId(id);
RandomAccessFile r = miniThumbDataFile(miniThumbDataFileId);
if (r == null) return;
long pos = id * BYTES_PER_MINTHUMB;
final long pos = getPositionInMiniThumbFile(id);
FileChannel channel=r.getChannel();
FileLock lock = null;
try {
if (data != null) {
@@ -266,14 +321,13 @@ public class MiniThumbFile {
check = sChecker.getValue();
}
mBuffer.putLong(check);
if (LOG) Log.i(TAG, "saveMiniThumbToFile(" + id + ") flag=1, magic="
+ magic + ", length=" + data.length + ", check=" + check);
mBuffer.put(data);
mBuffer.flip();
lock = mChannel.lock(pos, BYTES_PER_MINTHUMB, false);
mChannel.write(mBuffer, pos);
lock = channel.lock(pos, BYTES_PER_MINTHUMB, false);
channel.write(mBuffer, pos);
if (LOG) Log.i(TAG, "saveMiniThumbToFile(" + id + ") flag=1, magic="
+ magic + ", length=" + data.length + ", check=" + check);
}
} catch (IOException ex) {
Log.e(TAG, "couldn't save mini thumbnail data for "
@@ -319,27 +373,29 @@ public class MiniThumbFile {
* @return
*/
public synchronized byte[] getMiniThumbFromFile(long id, byte [] data, ThumbResult result) {
RandomAccessFile r = miniThumbDataFile();
final long miniThumbDataFileId=getMiniThumbFileId(id);
RandomAccessFile r = miniThumbDataFile(miniThumbDataFileId,true);
if (r == null) return null;
long pos = id * BYTES_PER_MINTHUMB;
long pos = getPositionInMiniThumbFile(id);
FileChannel channel=r.getChannel();
FileLock lock = null;
try {
mBuffer.clear();
lock = mChannel.lock(pos, BYTES_PER_MINTHUMB, true);
int size = mChannel.read(mBuffer, pos);
lock = channel.lock(pos, BYTES_PER_MINTHUMB, true);
int size = channel.read(mBuffer, pos);
if (size > 1 + 8 + 4 + 8) { // flag, magic, length, check code
mBuffer.position(0);
byte flag = mBuffer.get();
long magic = mBuffer.getLong();
int length = mBuffer.getInt();
long check = mBuffer.getLong();
if (LOG) Log.i(TAG, "getMiniThumbFromFile(" + id + ") flag=" + flag
+ ", magic=" + magic + ", length=" + length + ", check=" + check);
long newCheck = UNKNOWN_CHECK_CODE;
if (size >= 1 + 8 + 4 + 8 + length && data.length >= length) {
mBuffer.get(data, 0, length);
Log.i(TAG, " success to getMiniThumbFromFile(" + id + ") flag=" + flag
+ ", magic=" + magic + ", length=" + length + ", check=" + check);
synchronized (sChecker) {
sChecker.reset();
sChecker.update(data, 0, length);
MediaScanner.java文件的修改如下：
<div class="dp-highlighter bg_java" sizcache="27" sizset="68"><div class="bar" sizcache="27" sizset="68"><div class="tools" sizcache="27" sizset="68"><strong>[java]</strong> <a target=_blank title="view plain" class="ViewSource" href="http://blog.csdn.net/fengye810130/article/details/9118221#">view plain</a><a target=_blank title="copy" class="CopyToClipboard" href="http://blog.csdn.net/fengye810130/article/details/9118221#">copy</a><a target=_blank title="print" class="PrintSource" href="http://blog.csdn.net/fengye810130/article/details/9118221#">print</a><a target=_blank title="?" class="About" href="http://blog.csdn.net/fengye810130/article/details/9118221#">?</a></div></div><ol class="dp-j"><li class="alt"><span><span>@@ -</span><span class="number">1224</span><span>,</span><span class="number">14</span><span> +</span><span class="number">1224</span><span>,</span><span class="number">14</span><span> @@ </span><span class="keyword">public</span><span> </span><span class="keyword">class</span><span> MediaScanner </span></span></li><li><span> c.close(); </span></li><li class="alt"><span> } </span></li><li><span> </span><span class="keyword">if</span><span> (videoCount != </span><span class="number">0</span><span>) { </span></li><li class="alt"><span> </span><span class="comment">/*if (videoCount != 0) {</span> </li><li><span><span class="comment"> String fullPathString = MiniThumbFile.getThumbdataPath(mVideoThumbsUri);</span> </span></li><li class="alt"><span><span class="comment"> existingFiles.remove(fullPathString);</span> </span></li><li><span><span class="comment"> }</span> </span></li><li class="alt"><span><span class="comment"> if (imageCount != 0) {</span> </span></li><li><span><span class="comment"> String fullPathString = MiniThumbFile.getThumbdataPath(mThumbsUri);</span> </span></li><li class="alt"><span><span class="comment"> existingFiles.remove(fullPathString);</span> </span></li><li><span><span class="comment"> }</span> </span></li><li class="alt"><span><span class="comment"> }*/</span><span> </span></span></li><li><span> </span><span class="keyword">for</span><span> (String fileToDelete : existingFiles) { </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (LOG) </span></li><li><span> Log.v(TAG, </span><span class="string">"fileToDelete is "</span><span> + fileToDelete); </span></li><li class="alt"><span>@@ -</span><span class="number">1247</span><span>,</span><span class="number">7</span><span> +</span><span class="number">1247</span><span>,</span><span class="number">163</span><span> @@ </span><span class="keyword">public</span><span> </span><span class="keyword">class</span><span> MediaScanner </span></li><li><span> e.printStackTrace(); </span></li><li class="alt"><span> } </span></li><li><span> } </span></li><li class="alt"><span> </span><span class="comment">/*[robin_20120511*/</span><span> </span></li><li><span> </span><span class="keyword">private</span><span> </span><span class="keyword">void</span><span> pruneDeadMiniThumbnailFiles() { </span></li><li class="alt"><span> HashSet<String> existingFiles = </span><span class="keyword">new</span><span> HashSet<String>(); </span></li><li><span> String directory = Environment.getExternalStorageDirectory().toString() + </span><span class="string">"/DCIM/.thumbnails"</span><span>; </span></li><li class="alt"><span> File file=</span><span class="keyword">new</span><span> File(directory); </span></li><li><span> String [] files = (file).list(); </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (files == </span><span class="keyword">null</span><span>) { </span></li><li><span> files = </span><span class="keyword">new</span><span> String[</span><span class="number">0</span><span>]; </span></li><li class="alt"><span> } </span></li><li><span> </span><span class="keyword">for</span><span> (</span><span class="keyword">int</span><span> i=</span><span class="number">0</span><span>; i < files.length; i++) { </span></li><li class="alt"><span> String fullPathString = directory + </span><span class="string">"/"</span><span> + files[i]; </span></li><li><span> existingFiles.add(fullPathString); </span></li><li class="alt"><span> } </span></li><li><span> </span><span class="keyword">try</span><span> { </span></li><li class="alt"><span> Cursor c = mMediaProvider.query( </span></li><li><span> mThumbsUri, </span></li><li class="alt"><span> </span><span class="keyword">new</span><span> String [] { </span><span class="string">"_data"</span><span> }, </span></li><li><span> </span><span class="keyword">null</span><span>, </span></li><li class="alt"><span> </span><span class="keyword">null</span><span>, </span></li><li><span> </span><span class="keyword">null</span><span>); </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (</span><span class="keyword">null</span><span> != c) { </span></li><li><span> </span><span class="keyword">if</span><span> (c.moveToFirst()) { </span></li><li class="alt"><span> </span><span class="keyword">do</span><span> { </span></li><li><span> String fullPathString = c.getString(</span><span class="number">0</span><span>); </span></li><li class="alt"><span> existingFiles.remove(fullPathString); </span></li><li><span> } </span><span class="keyword">while</span><span> (c.moveToNext()); </span></li><li class="alt"><span> } </span></li><li><span> c.close(); </span></li><li class="alt"><span> } </span></li><li><span> c = mMediaProvider.query( </span></li><li class="alt"><span> mVideoThumbsUri, </span></li><li><span> </span><span class="keyword">new</span><span> String [] { </span><span class="string">"_data"</span><span> }, </span></li><li class="alt"><span> </span><span class="keyword">null</span><span>, </span></li><li><span> </span><span class="keyword">null</span><span>, </span></li><li class="alt"><span> </span><span class="keyword">null</span><span>); </span></li><li><span> </span><span class="keyword">if</span><span> (</span><span class="keyword">null</span><span> != c) { </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (c.moveToFirst()) { </span></li><li><span> </span><span class="keyword">do</span><span> { </span></li><li class="alt"><span> String fullPathString = c.getString(</span><span class="number">0</span><span>); </span></li><li><span> existingFiles.remove(fullPathString); </span></li><li class="alt"><span> } </span><span class="keyword">while</span><span> (c.moveToNext()); </span></li><li><span> } </span></li><li class="alt"><span> c.close(); </span></li><li><span> } </span></li><li class="alt"><span> String strs[]; </span></li><li><span> </span><span class="keyword">long</span><span> fileSN; </span></li><li class="alt"><span> </span><span class="keyword">long</span><span> id0; </span></li><li><span> </span><span class="keyword">long</span><span> id1; </span></li><li class="alt"><span> </span><span class="keyword">int</span><span> blockNum=MiniThumbFile.getMiniThumbDataFileBlockNum(); </span></li><li><span> </span><span class="keyword">final</span><span> String selection_IMAGE=</span><span class="string">" "</span><span>+Images.Thumbnails.IMAGE_ID+</span><span class="string">">=? AND "</span><span>+Images.Thumbnails.IMAGE_ID+</span><span class="string">"<?"</span><span>; </span></li><li class="alt"><span> </span><span class="keyword">final</span><span> String sortOrder_IMAGE=Images.Thumbnails.IMAGE_ID; </span></li><li><span> </span><span class="keyword">final</span><span> String selection_VIDEO=</span><span class="string">" "</span><span>+Video.Thumbnails.VIDEO_ID+</span><span class="string">">=? AND "</span><span>+Video.Thumbnails.VIDEO_ID+</span><span class="string">"<?"</span><span>; </span></li><li class="alt"><span> </span><span class="keyword">final</span><span> String sortOrder_VIDEO=Video.Thumbnails.VIDEO_ID; </span></li><li><span> HashSet<String> fileSet=</span><span class="keyword">new</span><span> HashSet<String>(existingFiles); </span></li><li class="alt"><span> </span><span class="keyword">for</span><span> (String fileToDelete : fileSet) { </span></li><li><span> strs=MiniThumbFile.parseFileName(fileToDelete); </span></li><li class="alt"><span> </span><span class="keyword">if</span><span>(strs==</span><span class="keyword">null</span><span>||strs.length!=</span><span class="number">4</span><span>) </span></li><li><span> { </span></li><li class="alt"><span> existingFiles.remove(fileToDelete); </span></li><li><span> </span><span class="keyword">continue</span><span>; </span></li><li class="alt"><span> } </span></li><li><span> </span><span class="keyword">if</span><span>(</span><span class="string">"images"</span><span>.equals(strs[</span><span class="number">2</span><span>])||</span><span class="string">"video"</span><span>.equals(strs[</span><span class="number">2</span><span>])) </span></li><li class="alt"><span> { </span></li><li><span> fileSN=Long.parseLong(strs[</span><span class="number">3</span><span>]); </span></li><li class="alt"><span> id0=blockNum*fileSN; </span></li><li><span> id1=blockNum*(fileSN+</span><span class="number">1</span><span>); </span></li><li class="alt"><span> </span><span class="keyword">final</span><span> String[] selectionArgs= </span><span class="keyword">new</span><span> String[]{id0+</span><span class="string">""</span><span>,id1+</span><span class="string">""</span><span>}; </span></li><li><span> </span><span class="keyword">if</span><span>(</span><span class="string">"images"</span><span>.equals(strs[</span><span class="number">2</span><span>])) </span></li><li class="alt"><span> { </span></li><li><span> </span></li><li class="alt"><span> c = mMediaProvider.query( </span></li><li><span> mThumbsUri, </span></li><li class="alt"><span> </span><span class="keyword">new</span><span> String [] { Images.Thumbnails.IMAGE_ID }, </span></li><li><span> selection_IMAGE, </span></li><li class="alt"><span> selectionArgs, </span></li><li><span> sortOrder_IMAGE); </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (</span><span class="keyword">null</span><span> != c) { </span></li><li><span> </span><span class="keyword">if</span><span> (c.getCount()></span><span class="number">0</span><span>) { </span></li><li class="alt"><span> </span></li><li><span> existingFiles.remove(fileToDelete); </span></li><li class="alt"><span> } </span></li><li><span> c.close(); </span></li><li class="alt"><span> } </span></li><li><span> } </span></li><li class="alt"><span> </span><span class="keyword">else</span><span> </span><span class="keyword">if</span><span> (</span><span class="string">"video"</span><span>.equals(strs[</span><span class="number">2</span><span>])) </span></li><li><span> { </span></li><li class="alt"><span> c = mMediaProvider.query( </span></li><li><span> mVideoThumbsUri, </span></li><li class="alt"><span> </span><span class="keyword">new</span><span> String [] { Video.Thumbnails.VIDEO_ID }, </span></li><li><span> selection_VIDEO, </span></li><li class="alt"><span> selectionArgs, </span></li><li><span> sortOrder_VIDEO); </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (</span><span class="keyword">null</span><span> != c) { </span></li><li><span> </span><span class="keyword">if</span><span> (c.getCount()></span><span class="number">0</span><span>) { </span></li><li class="alt"><span> existingFiles.remove(fileToDelete); </span></li><li><span> } </span></li><li class="alt"><span> c.close(); </span></li><li><span> } </span></li><li class="alt"><span> } </span></li><li><span> } </span></li><li class="alt"><span> </span><span class="keyword">else</span><span> </span></li><li><span> { </span></li><li class="alt"><span> existingFiles.remove(fileToDelete); </span></li><li><span> } </span></li><li class="alt"><span> } </span></li><li><span> </span><span class="keyword">for</span><span> (String fileToDelete : existingFiles) { </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (LOG) </span></li><li><span> Log.v(TAG, </span><span class="string">"fileToDelete is "</span><span> + fileToDelete); </span></li><li class="alt"><span> </span><span class="keyword">try</span><span> { </span></li><li><span> (</span><span class="keyword">new</span><span> File(fileToDelete)).delete(); </span></li><li class="alt"><span> } </span><span class="keyword">catch</span><span> (SecurityException ex) { </span></li><li><span> ex.printStackTrace(); </span></li><li class="alt"><span> } </span></li><li><span> } </span></li><li class="alt"><span> file=</span><span class="keyword">new</span><span> File(directory); </span></li><li><span> </span><span class="keyword">long</span><span> freeDiskSpape=(file.getUsableSpace()>></span><span class="number">20</span><span>); </span></li><li class="alt"><span> </span><span class="comment">/*</span> </li><li><span><span class="comment"> * when the free Disk is very low(<100M),delete all MiniThumbFile</span> </span></li><li class="alt"><span><span class="comment"> */</span><span> </span></span></li><li><span> </span><span class="keyword">if</span><span>(freeDiskSpape<</span><span class="number">100</span><span>) </span></li><li class="alt"><span> { </span></li><li><span> files = (file).list(); </span></li><li class="alt"><span> </span><span class="keyword">if</span><span> (files == </span><span class="keyword">null</span><span>) { </span></li><li><span> files = </span><span class="keyword">new</span><span> String[</span><span class="number">0</span><span>]; </span></li><li class="alt"><span> } </span></li><li><span> </span><span class="keyword">for</span><span> (</span><span class="keyword">int</span><span> i=</span><span class="number">0</span><span>; i < files.length; i++) { </span></li><li class="alt"><span> String fullPathString = directory + </span><span class="string">"/"</span><span> + files[i]; </span></li><li><span> existingFiles.add(fullPathString); </span></li><li class="alt"><span> } </span></li><li><span> fileSet=</span><span class="keyword">new</span><span> HashSet<String>(existingFiles); </span></li><li class="alt"><span> </span><span class="keyword">for</span><span> (String fileToDelete : fileSet) { </span></li><li><span> strs=MiniThumbFile.parseFileName(fileToDelete); </span></li><li class="alt"><span> </span><span class="keyword">if</span><span>(strs==</span><span class="keyword">null</span><span>||strs.length!=</span><span class="number">4</span><span>) </span></li><li><span> { </span></li><li class="alt"><span> existingFiles.remove(fileToDelete); </span></li><li><span> </span><span class="keyword">continue</span><span>; </span></li><li class="alt"><span> } </span></li><li><span> } </span></li><li class="alt"><span> </span><span class="keyword">for</span><span> (String fileToDelete : existingFiles) { </span></li><li><span> </span><span class="keyword">if</span><span> (LOG) </span></li><li class="alt"><span> Log.v(TAG, </span><span class="string">"Memeroy is very Low.delete MiniThumbFile:"</span><span> + fileToDelete); </span></li><li><span> </span><span class="keyword">try</span><span> { </span></li><li class="alt"><span> (</span><span class="keyword">new</span><span> File(fileToDelete)).delete(); </span></li><li><span> } </span><span class="keyword">catch</span><span> (SecurityException ex) { </span></li><li class="alt"><span> ex.printStackTrace(); </span></li><li><span> } </span></li><li class="alt"><span> } </span></li><li><span> </span></li><li class="alt"><span> } </span></li><li><span> Log.v(TAG, </span><span class="string">"pruneDeadMiniThumbnailFiles... "</span><span> + c); </span></li><li class="alt"><span> } </span><span class="keyword">catch</span><span> (RemoteException e) { </span></li><li><span> </span><span class="comment">/* We will soon be killed...*/</span><span> </span></li><li class="alt"><span> e.printStackTrace(); </span></li><li><span> } </span></li><li class="alt"><span> } </span></li><li><span> </span><span class="comment">/*robin_20120511]*/</span><span> </span></li><li class="alt"><span> </span><span class="keyword">private</span><span> </span><span class="keyword">void</span><span> postscan(String[] directories) </span><span class="keyword">throws</span><span> RemoteException { </span></li><li><span> Iterator<FileCacheEntry> iterator = mFileCache.values().iterator(); </span></li><li class="alt"><span>@@ -</span><span class="number">1306</span><span>,</span><span class="number">8</span><span> +</span><span class="number">1462</span><span>,</span><span class="number">12</span><span> @@ </span><span class="keyword">public</span><span> </span><span class="keyword">class</span><span> MediaScanner </span></li><li><span> </span><span class="keyword">if</span><span> ((mOriginalCount == </span><span class="number">0</span><span> || mOriginalVideoCount == </span><span class="number">0</span><span>) </span></li><li class="alt"><span> && mImagesUri.equals(Images.Media.getContentUri(</span><span class="string">"external"</span><span>))) { </span></li><li><span> pruneDeadThumbnailFiles(); </span></li><li class="alt"><span> }</span><span class="comment">/*[robin_20120511*/</span><span> </span></li><li><span> </span><span class="keyword">else</span><span> </span><span class="keyword">if</span><span> (mImagesUri.equals(Images.Media.getContentUri(</span><span class="string">"external"</span><span>))) </span></li><li class="alt"><span> { </span></li><li><span> pruneDeadMiniThumbnailFiles(); </span></li><li class="alt"><span> } </span></li><li><span> </span></li><li class="alt"><span> </span><span class="comment">/*robin_20120511]*/</span><span> </span></li><li><span> </span><span class="comment">/* allow GC to clean up*/</span><span> </span></li><li class="alt"><span> mPlayLists = </span><span class="keyword">null</span><span>; </span></li><li><span> mFileCache = </span><span class="keyword">null</span><span>; </span></li><li class="alt"><span>@@ -</span><span class="number">1399</span><span>,</span><span class="number">7</span><span> +</span><span class="number">1559</span><span>,</span><span class="number">12</span><span> @@ </span><span class="keyword">public</span><span> </span><span class="keyword">class</span><span> MediaScanner </span></li><li><span> </span><span class="keyword">long</span><span> prune = System.currentTimeMillis(); </span></li><li class="alt"><span> pruneDeadThumbnailFiles(); </span></li><li><span> </span><span class="keyword">if</span><span> (LOG) Log.d(TAG, </span><span class="string">"mtkPostscan: pruneDeadThumbnailFiles takes "</span><span> + (System.currentTimeMillis() - prune) + </span><span class="string">"ms."</span><span>); </span></li><li class="alt"><span> }</span><span class="comment">/*[robin_20120511*/</span><span> </span></li><li><span> </span><span class="keyword">else</span><span> </span><span class="keyword">if</span><span> (mImagesUri.equals(Images.Media.getContentUri(</span><span class="string">"external"</span><span>))) </span></li><li class="alt"><span> { </span></li><li><span> pruneDeadMiniThumbnailFiles(); </span></li><li class="alt"><span> } </span></li><li><span> </span><span class="comment">/*robin_20120511]*/</span><span> </span></li><li class="alt"><span> </span></li><li><span> </span><span class="comment">// allow GC to clean up </span><span> </span></li><li class="alt"><span> mPlayLists = </span><span class="keyword">null</span><span>; </span></li></ol></div><pre class="java" style="DISPLAY: none" name="code">@@ -1224,14 +1224,14 @@ public class MediaScanner
c.close();
}
if (videoCount != 0) {
/*if (videoCount != 0) {
String fullPathString = MiniThumbFile.getThumbdataPath(mVideoThumbsUri);
existingFiles.remove(fullPathString);
}
if (imageCount != 0) {
String fullPathString = MiniThumbFile.getThumbdataPath(mThumbsUri);
existingFiles.remove(fullPathString);
}
}*/
for (String fileToDelete : existingFiles) {
if (LOG)
Log.v(TAG, "fileToDelete is " + fileToDelete);
@@ -1247,7 +1247,163 @@ public class MediaScanner
e.printStackTrace();
}
}
/*[robin_20120511*/
private void pruneDeadMiniThumbnailFiles() {
HashSet<String> existingFiles = new HashSet<String>();
String directory = Environment.getExternalStorageDirectory().toString() + "/DCIM/.thumbnails";
File file=new File(directory);
String [] files = (file).list();
if (files == null) {
files = new String[0];
}
for (int i=0; i < files.length; i++) {
String fullPathString = directory + "/" + files[i];
existingFiles.add(fullPathString);
}
try {
Cursor c = mMediaProvider.query(
mThumbsUri,
new String [] { "_data" },
null,
null,
null);
if (null != c) {
if (c.moveToFirst()) {
do {
String fullPathString = c.getString(0);
existingFiles.remove(fullPathString);
} while (c.moveToNext());
}
c.close();
}
c = mMediaProvider.query(
mVideoThumbsUri,
new String [] { "_data" },
null,
null,
null);
if (null != c) {
if (c.moveToFirst()) {
do {
String fullPathString = c.getString(0);
existingFiles.remove(fullPathString);
} while (c.moveToNext());
}
c.close();
}
String strs[];
long fileSN;
long id0;
long id1;
int blockNum=MiniThumbFile.getMiniThumbDataFileBlockNum();
final String selection_IMAGE=" "+Images.Thumbnails.IMAGE_ID+">=? AND "+Images.Thumbnails.IMAGE_ID+"<?";
final String sortOrder_IMAGE=Images.Thumbnails.IMAGE_ID;
final String selection_VIDEO=" "+Video.Thumbnails.VIDEO_ID+">=? AND "+Video.Thumbnails.VIDEO_ID+"<?";
final String sortOrder_VIDEO=Video.Thumbnails.VIDEO_ID;
HashSet<String> fileSet=new HashSet<String>(existingFiles);
for (String fileToDelete : fileSet) {
strs=MiniThumbFile.parseFileName(fileToDelete);
if(strs==null||strs.length!=4)
{
existingFiles.remove(fileToDelete);
continue;
}
if("images".equals(strs[2])||"video".equals(strs[2]))
{
fileSN=Long.parseLong(strs[3]);
id0=blockNum*fileSN;
id1=blockNum*(fileSN+1);
final String[] selectionArgs= new String[]{id0+"",id1+""};
if("images".equals(strs[2]))
{
c = mMediaProvider.query(
mThumbsUri,
new String [] { Images.Thumbnails.IMAGE_ID },
selection_IMAGE,
selectionArgs,
sortOrder_IMAGE);
if (null != c) {
if (c.getCount()>0) {
existingFiles.remove(fileToDelete);
}
c.close();
}
}
else if ("video".equals(strs[2]))
{
c = mMediaProvider.query(
mVideoThumbsUri,
new String [] { Video.Thumbnails.VIDEO_ID },
selection_VIDEO,
selectionArgs,
sortOrder_VIDEO);
if (null != c) {
if (c.getCount()>0) {
existingFiles.remove(fileToDelete);
}
c.close();
}
}
}
else
{
existingFiles.remove(fileToDelete);
}
}
for (String fileToDelete : existingFiles) {
if (LOG)
Log.v(TAG, "fileToDelete is " + fileToDelete);
try {
(new File(fileToDelete)).delete();
} catch (SecurityException ex) {
ex.printStackTrace();
}
}
file=new File(directory);
long freeDiskSpape=(file.getUsableSpace()>>20);
/*
* when the free Disk is very low(<100M),delete all MiniThumbFile
*/
if(freeDiskSpape<100)
{
files = (file).list();
if (files == null) {
files = new String[0];
}
for (int i=0; i < files.length; i++) {
String fullPathString = directory + "/" + files[i];
existingFiles.add(fullPathString);
}
fileSet=new HashSet<String>(existingFiles);
for (String fileToDelete : fileSet) {
strs=MiniThumbFile.parseFileName(fileToDelete);
if(strs==null||strs.length!=4)
{
existingFiles.remove(fileToDelete);
continue;
}
}
for (String fileToDelete : existingFiles) {
if (LOG)
Log.v(TAG, "Memeroy is very Low.delete MiniThumbFile:" + fileToDelete);
try {
(new File(fileToDelete)).delete();
} catch (SecurityException ex) {
ex.printStackTrace();
}
}
}
Log.v(TAG, "pruneDeadMiniThumbnailFiles... " + c);
} catch (RemoteException e) {
/* We will soon be killed...*/
e.printStackTrace();
}
}
/*robin_20120511]*/
private void postscan(String[] directories) throws RemoteException {
Iterator<FileCacheEntry> iterator = mFileCache.values().iterator();
@@ -1306,8 +1462,12 @@ public class MediaScanner
if ((mOriginalCount == 0 || mOriginalVideoCount == 0)
&& mImagesUri.equals(Images.Media.getContentUri("external"))) {
pruneDeadThumbnailFiles();
}/*[robin_20120511*/
else if (mImagesUri.equals(Images.Media.getContentUri("external")))
{
pruneDeadMiniThumbnailFiles();
}
/*robin_20120511]*/
/* allow GC to clean up*/
mPlayLists = null;
mFileCache = null;
@@ -1399,7 +1559,12 @@ public class MediaScanner
long prune = System.currentTimeMillis();
pruneDeadThumbnailFiles();
if (LOG) Log.d(TAG, "mtkPostscan: pruneDeadThumbnailFiles takes " + (System.currentTimeMillis() - prune) + "ms.");
}/*[robin_20120511*/
else if (mImagesUri.equals(Images.Media.getContentUri("external")))
{
pruneDeadMiniThumbnailFiles();
}
/*robin_20120511]*/
// allow GC to clean up
mPlayLists = null;
结束！