private void restartPreviewAndDecode() {
   if (state == State.SUCCESS) {
     state = State.PREVIEW;
     CameraManager.get().requestPreviewFrame(decodeThread.getHandler(), R.id.decode);
     CameraManager.get().requestAutoFocus(this, R.id.auto_focus);
     activity.drawViewfinder();
   }
 }
  public void quitSynchronously() {
    state = State.DONE;
    CameraManager.get().stopPreview();
    Message quit = Message.obtain(decodeThread.getHandler(), R.id.quit);
    quit.sendToTarget();
    try {
      decodeThread.join();
    } catch (InterruptedException e) {
      // continue
    }

    // Be absolutely sure we don't send any queued up messages
    removeMessages(R.id.decode_succeeded);
    removeMessages(R.id.decode_failed);
  }
  @Override
  public void handleMessage(Message message) {
    switch (message.what) {
      case R.id.auto_focus:
        // Log.d(TAG, "Got auto-focus message");
        // When one auto focus pass finishes, start another. This is the closest thing to
        // continuous AF. It does seem to hunt a bit, but I'm not sure what else to do.
        if (state == State.PREVIEW) {
          CameraManager.get().requestAutoFocus(this, R.id.auto_focus);
        }
        break;
      case R.id.restart_preview:
        Log.d(TAG, "Got restart preview message");
        restartPreviewAndDecode();
        break;
      case R.id.decode_succeeded:
        Log.d(TAG, "Got decode succeeded message");
        state = State.SUCCESS;
        Bundle bundle = message.getData();

        /** ******************************************************************** */
        Bitmap barcode =
            bundle == null
                ? null
                : (Bitmap) bundle.getParcelable(DecodeThread.BARCODE_BITMAP); // 锟斤拷锟矫憋拷锟斤拷锟竭筹拷

        activity.handleDecode((Result) message.obj, barcode); // 锟斤拷锟截斤拷锟�
        // /***********************************************************************/
        break;
      case R.id.decode_failed:
        // We're decoding as fast as possible, so when one decode fails, start another.
        state = State.PREVIEW;
        CameraManager.get().requestPreviewFrame(decodeThread.getHandler(), R.id.decode);
        break;
      case R.id.return_scan_result:
        Log.d(TAG, "Got return scan result message");
        activity.setResult(Activity.RESULT_OK, (Intent) message.obj);
        activity.finish();
        break;
      case R.id.launch_product_query:
        Log.d(TAG, "Got product query message");
        String url = (String) message.obj;
        Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
        activity.startActivity(intent);
        break;
    }
  }