Android扫描ｓｄ卡和系统文件

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原创作品，转载请注明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。 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。12-13 15:39:11.062: VERBOSE/MediaPlayerService(67): Create new media retriever from pid 349<br>12-13 15:39:11.082: DEBUG/MediaScannerService(349): getDefaultLocale =zh_CN12-13 15:39:11.122: DEBUG/SurfaceFlinger(102): Layer::requestBuffer(this=0x7c8c68), index=1, pid=12866, w=309, h=192 success12-13 15:39:11.142: INFO/MediaScanner(349): mOriginalCount = 14, prune thumb flag = false<br>12-13 15:39:11.142: DEBUG/MediaScanner(349):  prescan time: 44ms<br>12-13 15:39:11.142: DEBUG/MediaScanner(349):     scan time: 13ms<br>12-13 15:39:11.142: DEBUG/MediaScanner(349): postscan time: 2ms<br>12-13 15:39:11.142: DEBUG/MediaScanner(349):    total time: 59ms<br>12-13 15:39:11.152: DEBUG/MediaProvider(349): un-lock thumbnail worker<br>12-13 15:39:11.152: DEBUG/MediaProvider(349): un-lock thumbnail worker<br>12-13 15:39:11.182: DEBUG/MediaScannerService(349): done scanning volume external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它存了些什么信息呢，拉出来看看吧：<img src="https://pic002.cnblogs.com/images/2010/210374/2010121315535739.gif" alt="">  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)？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);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：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;             }