如何等待sendBroadcast完成

Question

我正在使用sendBroadcast进行媒体文件扫描。然后我需要等到sendBroadcast完成后再完成。我如何在Android中执行此操作？

我知道我可以用一个简单的，而这里的逻辑，但我正在寻找一个更好的办法

context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://" + Environment.getExternalStorageDirectory()))); 

// wait here till till do something completed 

接收机

private BroadcastReceiver mediaScanner = new BroadcastReceiver(){ 

     @Override 
     public void onReceive(Context context, Intent intent) { 
      String action = intent.getAction(); 
       if (action.equals(Intent.ACTION_MEDIA_SCANNER_FINISHED)) { 
        // Do some thing here. 
       } 
    } 
} 

Answer 1

以下是检查媒体扫描仪是否正在运行的代码。

public static final boolean isMediaScannerScanning(final ContentResolver cr) { 
    boolean result = false; 
    final Cursor cursor = query(cr, MediaStore.getMediaScannerUri(), new String[] { MediaStore.MEDIA_SCANNER_VOLUME }, null, 
      null, null); 
    if (cursor != null) { 
     if (cursor.getCount() == 1) { 
      cursor.moveToFirst(); 
      result = "external".equals(cursor.getString(0)); 
     } 
     cursor.close(); 
    } 
    return result; 
} 

我这里张贴了答案 http://androidbridge.blogspot.com/2012/06/how-to-check-whether-android-media.html

Answer 2

你可以看看在Java中Observable pattern，它配衬你的意志