android 扫描SD卡与系统文件(转)
16lz
2021-01-23
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
12-13 15:39:11.082: DEBUG/MediaScannerService(349): getDefaultLocale =zh_CN
12-13 15:39:11.122: DEBUG/SurfaceFlinger(102): Layer::requestBuffer(this=0x7c8c68), index=1, pid=12866, w=309, h=192 success
12-13 15:39:11.142: INFO/MediaScanner(349): mOriginalCount = 14, prune thumb flag = false
12-13 15:39:11.142: DEBUG/MediaScanner(349): prescan time: 44ms
12-13 15:39:11.142: DEBUG/MediaScanner(349): scan time: 13ms
12-13 15:39:11.142: DEBUG/MediaScanner(349): postscan time: 2ms
12-13 15:39:11.142: DEBUG/MediaScanner(349): total time: 59ms
12-13 15:39:11.152: DEBUG/MediaProvider(349): un-lock thumbnail worker
12-13 15:39:11.152: DEBUG/MediaProvider(349): un-lock thumbnail worker
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:
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)?
好了,最后一个问题,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:
转自:
http://blog.csdn.net/cai200711/article/details/6594985
12-13 15:39:11.062: VERBOSE/MediaPlayerService(67): Create new media retriever from pid 349
12-13 15:39:11.082: DEBUG/MediaScannerService(349): getDefaultLocale =zh_CN
12-13 15:39:11.122: DEBUG/SurfaceFlinger(102): Layer::requestBuffer(this=0x7c8c68), index=1, pid=12866, w=309, h=192 success
12-13 15:39:11.142: INFO/MediaScanner(349): mOriginalCount = 14, prune thumb flag = false
12-13 15:39:11.142: DEBUG/MediaScanner(349): prescan time: 44ms
12-13 15:39:11.142: DEBUG/MediaScanner(349): scan time: 13ms
12-13 15:39:11.142: DEBUG/MediaScanner(349): postscan time: 2ms
12-13 15:39:11.142: DEBUG/MediaScanner(349): total time: 59ms
12-13 15:39:11.152: DEBUG/MediaProvider(349): un-lock thumbnail worker
12-13 15:39:11.152: DEBUG/MediaProvider(349): un-lock thumbnail worker
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:
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(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,new String[]{MediaStore.Audio.Media._ID,MediaStore.Audio.Media.DISPLAY_NAME,MediaStore.Audio.Media.TITLE,MediaStore.Audio.Media.DURATION,MediaStore.Audio.Media.ARTIST,MediaStore.Audio.Media.ALBUM,MediaStore.Audio.Media.YEAR,MediaStore.Audio.Media.MIME_TYPE,MediaStore.Audio.Media.SIZE,MediaStore.Audio.Media.DATA}, "_size>?", new String[]{1024*1024+""},null);
好了,最后一个问题,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 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(); 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; }
转自:
http://blog.csdn.net/cai200711/article/details/6594985