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我已经搜索了很多，但我无法找到解决这个问题的方法。我正在创建一个实时处理音频的应用程序。因此，我创建了一个 ASyncTask 来初始化麦克风并处理接收到的声音：

public class SoundSampler extends AsyncTask<Void, Void, Void>{

AudioRecord recorder;
int bufferSize;
final short[] audioData;

public SoundSampler() {
    int samplerate = 44100;
    int encoding = AudioFormat.ENCODING_PCM_16BIT;
    int config = AudioFormat.CHANNEL_IN_MONO;
    bufferSize = AudioRecord.getMinBufferSize(samplerate, config, encoding);
    recorder = new AudioRecord(MediaRecorder.AudioSource.MIC, samplerate, config, encoding, bufferSize);

    final int finalBufferSize = bufferSize;
    audioData = new short[finalBufferSize];             

    OnRecordPositionUpdateListener positionUpdater = new OnRecordPositionUpdateListener() {
        @Override
        public void onPeriodicNotification(AudioRecord recorder) {
        // do something amazing with audio data (long operations)
        }

        @Override
        public void onMarkerReached(AudioRecord recorder) {                            Log.d("Process", "marker reached");
        }
    };
    recorder.setRecordPositionUpdateListener(positionUpdater);
    recorder.setPositionNotificationPeriod(64);
    Log.d("Process", "starTAGt recording, bufferSize: " + bufferSize);
    Log.d("Process", "state = " + recorder.getState() + " aud = " + audioData.length);
    }

    @Override
    protected Void doInBackground(Void... params) {
        recorder.startRecording();
        Log.d("Process", "rec = " + recorder.getRecordingState());
        while (!isCancelled()) {
             recorder.read(audioData, 0, bufferSize);
        }
        recorder.stop();
        return null;
    }

}

这是我的主要活动的 onCreate：

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Button on = (Button) findViewById(R.id.on);
        Button off = (Button) findViewById(R.id.off);

        final SoundSampler smp =  new SoundSampler();

        on.setOnClickListener(new View.OnClickListener() {          
            @Override
            public void onClick(View v) {
                 smp.execute();
            }
        });

        off.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                smp.cancel(true);
            }
        });


    }

现在，声音已注册，但在我启动 SoundSampler AsyncTask 后，UI 被阻塞。我希望 SoundSampler 注册数据，但我希望他从主 UI 中按我的意愿停止。你对这样做有什么建议吗？

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1 回答 1

0

这些OnRecordPositionUpdateListener方法在 UI 线程上被调用。您可以通过在侦听器的方法中插入以下日志语句来确认这一点：

Log.i(TAG, "OnRecordPositionUpdateListener on thread: " + Thread.currentThread().getName());

您必须生成一个新线程才能在其中执行长时间运行的操作onPeriodicNotification(AudioRecord recorder){}

于 2012-11-01T21:23:36.497 回答