问Java启动和停止线程

EN

private void startRecordingUserInput() {
    AudioDispatcher dispatcher =
            AudioDispatcherFactory.fromDefaultMicrophone(44100, 2048, 0);


    PitchDetectionHandler pdh = new PitchDetectionHandler() {
        @Override
        public void handlePitch(PitchDetectionResult res, AudioEvent e) {
            final float pitchInHz = res.getPitch();
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    pitchText.setText("" + pitchInHz);
                    gameView.setSingerArrowPitch(pitchInHz);
                    gameView.setCurrentTime(mid);
                    gameView.invalidate();
                }
            });
        }
    };
    AudioProcessor pitchProcessor = new PitchProcessor(PitchProcessor.PitchEstimationAlgorithm.FFT_YIN, 44100, 2048, pdh);
    dispatcher.addAudioProcessor(pitchProcessor);

    Thread audioThread = new Thread(dispatcher, "Audio Thread");
    audioThread.start();
} 

    //Start the Thread
    startRecordingUserInput();

    playRecordButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if(!isPlaying){

                //Start the Thread again if it is not running or 
                //make a new one

                isPlaying = true;

            } else if(isPlaying){

                //Stop the Thread

                isPlaying = false;

            }
        }
    });