问广播接收机在片段中不接收服务意图

EN

@Override
public void onStart() {
   // TODO Auto-generated method stub
   super.onStart();
   IntentFilter intentFilter = new IntentFilter();
   intentFilter.addAction(ffmpegService.PROGRESS);
   intentFilter.addAction(ffmpegService.DONE);
   LocalBroadcastManager.getInstance(getActivity()).
       registerReceiver(receiver, intentFilter);
}

@Override
public void onStop() {
   LocalBroadcastManager.getInstance(getActivity()).unregisterReceiver(receiver); 
   super.onStop();
}

private final BroadcastReceiver receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
   if(intent.getAction().equalsIgnoreCase(ffmpegService.PROGRESS)){
     ....
   }
}

private Handler handler;
private Context mContext;

public void onCreate() {
   mContext = this.getApplicationContext();
}

@Override
public void onStart(Intent intent, int startid) {
   handler = new Handler();
   handler.postDelayed(workTask, 3000);
}

private Runnable workTask = new Runnable() {
   @Override
   public void run() {
     Intent intent = new Intent(PROGRESS);
     intent.putExtra("progress", 90);
     LocalBroadcastManager.getInstance(mContext).sendBroadcast(intent);
   }
}