原生Android缩略图填满SD卡的问题
本人博客原文
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：
modified : frameworks / base / media / java / android / media / MediaScanner . javamodified : frameworks / base / media / java / android / media / MiniThumbFile . java
MiniThumbFile.java文件的主要修改如下：
/**
@@ -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：
@@
-
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！