Android 扫描SDCard上的音乐文件以及监听扫描事件
广播接收机代码：
public class ScanSdReceiver extends BroadcastReceiver
{
@Override
public void onReceive(Context context, Intent intent)
{
String action = intent.getAction();
if (Intent.ACTION_MEDIA_SCANNER_STARTED.equals(action))
{
//开始扫描，把你的代码放这里
}
else if (Intent.ACTION_MEDIA_SCANNER_FINISHED.equals(action))
{
//扫描结束，把你的代码放这里
}
}
} IntentFilter intentfilter = new IntentFilter(Intent.ACTION_MEDIA_SCANNER_STARTED);
intentfilter.addAction(Intent.ACTION_MEDIA_SCANNER_FINISHED);
intentfilter.addDataScheme("file");
ScanSdReceiver scanSdReceiver = new ScanSdReceiver();
registerReceiver(scanSdReceiver, intentfilter); 扫描SDCard
sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,
Uri.parse("file://" + Environment.getExternalStorageDirectory().getAbsolutePath()))); ================================================================================
如果你做过多媒体应用，一定会苦恼过，怎样获取sd卡中的多媒体文件。android还是很强大的，如果你知道怎么调用android的api，万事就ok了。
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当手机或模拟器开机时，会调用android的MediaScanner，扫描sd卡和内存里的文件。以下是log信息。
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12
-
13
15
:
39
:
11.062
: VERBOSE/MediaPlayerService(
67
): Create
new
media retriever from pid
349
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12
-
13
15
:
39
:
11.082
: DEBUG/MediaScannerService(
349
): getDefaultLocale =zh_CN
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12
-
13
15
:
39
:
11.122
: DEBUG/SurfaceFlinger(
102
): Layer::requestBuffer(
this
=
0x7c8c68
), index=
1
, pid=
12866
, w=
309
, h=
192
success
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12
-
13
15
:
39
:
11.142
: INFO/MediaScanner(
349
): mOriginalCount =
14
, prune thumb flag =
false
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12
-
13
15
:
39
:
11.142
: DEBUG/MediaScanner(
349
): prescan time: 44ms
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12
-
13
15
:
39
:
11.142
: DEBUG/MediaScanner(
349
): scan time: 13ms
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12
-
13
15
:
39
:
11.142
: DEBUG/MediaScanner(
349
): postscan time: 2ms
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12
-
13
15
:
39
:
11.142
: DEBUG/MediaScanner(
349
): total time: 59ms
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12
-
13
15
:
39
:
11.152
: DEBUG/MediaProvider(
349
): un-lock thumbnail worker
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12
-
13
15
:
39
:
11.152
: DEBUG/MediaProvider(
349
): un-lock thumbnail worker
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12
-
13
15
:
39
:
11.182
: DEBUG/MediaScannerService(
349
): done scanning volume external
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那么扫描后的记录它保存到哪里了呢。哈。你觉得在哪里呢？data/data/com.android.media/providers/databases/external
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它存了些什么信息呢，拉出来看看吧：
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那么，我们直接使用ContentProvider就可以直接获取到sd卡中多媒体的信息了，你还用去listfile么？还用去自己解析媒体文件中的信息么(时长，文件名，专辑名。。应有尽有哦)？
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Cursor cursor = context.getContentResolver().query(
new
String[] { MediaStore.Audio.Media._ID, MediaStore.Audio.Media.DISPLAY_NAME, MediaStore.Audio.Media.TITLE,
"_size>?"
,
new
String[]{
1024
*
1024
+
""
},
null
);
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好了，最后一个问题
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IntentFilter intentFilter =
new
IntentFilter(Intent.ACTION_MEDIA_SCANNER_STARTED);
intentFilter.addAction(Intent.ACTION_MEDIA_SCANNER_FINISHED);
intentFilter.addDataScheme(
"file"
);
scanReceiver =
new
ScanSdFilesReceiver();
registerReceiver(scanReceiver, intentFilter);
sendBroadcast(
new
Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse(
"file://"
+ Environment.getExternalStorageDirectory())));
private
class
ScanSdFilesReceiver
extends
BroadcastReceiver {
public
void
onReceive(Context context, Intent intent) {
String action = intent.getAction();
if
(Intent.ACTION_MEDIA_SCANNER_STARTED.equals(action)) {
scanHandler.sendEmptyMessage(STARTED);
}
if
(Intent.ACTION_MEDIA_SCANNER_FINISHED.equals(action)) {
scanHandler.sendEmptyMessage(FINISHED);
}
}
}
private
Handler scanHandler =
new
Handler() {
public
void
handleMessage(Message msg) {
super
.handleMessage(msg);
switch
(msg.what) {
case
STARTED:
MyDialog scanDialog =
new
MyDialog(LocalList.
this
);
scanAlertDialog = scanDialog.scanFile();
scanAlertDialog.show();
Log.i(TAG,
"showing"
);
break
;
case
FINISHED:
ArrayList
this
, LOCAL);
if
(tempSongs !=
null
&& tempSongs.size()>
0
) {
if
(songs !=
null
&& songs.size()>
0
) {
songs.clear();
songs.addAll(tempSongs);
songAdapter.notifyDataSetChanged();
}
else
{
songs =
new
ArrayList
songs.addAll(tempSongs);
initSong_lv();
}
}
else
{
Toast.makeText(LocalList.
this
,
"SD卡中没有歌曲，请添加后再扫描"
, Toast.LENGTH_SHORT).show();
}
Log.i(TAG,
"finish"
);
if
(scanAlertDialog!=
null
&& scanAlertDialog.isShowing()) {
scanAlertDialog.dismiss();
}
unregisterReceiver(scanReceiver);
break
;
case
DISMISS:
Log.i(TAG,
"dismiss"
);
if
(scanAlertDialog!=
null
&& scanAlertDialog.isShowing()) {
scanAlertDialog.dismiss();
}
default
:
break
;
}
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