public void quitSynchronously() { state = State.DONE; cameraManager.stopPreview(); Message quit = Message.obtain(decodeThread.getHandler(), R.id.quit); quit.sendToTarget(); try { // Wait at most half a second; should be enough time, and onPause() // will timeout quickly decodeThread.join(500L); } 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); }