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
}
}
}
注册广播接收机,监听SDcard扫描事件
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())));
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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 <br> |
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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 <br> |
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12 - 13 15 : 39 : 11.142 : DEBUG/MediaScanner( 349 ): prescan time: 44ms<br> |
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12 - 13 15 : 39 : 11.142 : DEBUG/MediaScanner( 349 ): scan time: 13ms<br> |
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12 - 13 15 : 39 : 11.142 : DEBUG/MediaScanner( 349 ): postscan time: 2ms<br> |
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12 - 13 15 : 39 : 11.142 : DEBUG/MediaScanner( 349 ): total time: 59ms<br> |
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12 - 13 15 : 39 : 11.152 : DEBUG/MediaProvider( 349 ): un-lock thumbnail worker<br> |
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12 - 13 15 : 39 : 11.152 : DEBUG/MediaProvider( 349 ): un-lock thumbnail worker<br> |
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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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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(<br> MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,<br> new String[] { MediaStore.Audio.Media._ID, MediaStore.Audio.Media.DISPLAY_NAME, MediaStore.Audio.Media.TITLE,<br> MediaStore.Audio.Media.DURATION, MediaStore.Audio.Media.ARTIST, MediaStore.Audio.Media.ALBUM,<br> MediaStore.Audio.Media.YEAR, MediaStore.Audio.Media.MIME_TYPE, MediaStore.Audio.Media.SIZE, MediaStore.Audio.Media.DATA}<br> , "_size>?" , new String[]{ 1024 * 1024 + "" }, null ); |
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好了,最后一个问题<br> 当你往sd卡中添加一些多媒体文件的时候,android没有自动将它刷新到数据库中。那么我们怎么让它手动刷新呢,如下: |
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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<Song> tempSongs = ReadFileList.readDataFromSD(LocalList. 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<Song>(); 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 ; } |