MediaRecorder.getMaxAmplitude()总是返回0.0

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MediaRecorder recorder = new MediaRecorder();
public void start() {
    MediaRecorder recorder = new MediaRecorder();
    recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
    recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    recorder.setOutputFile("/dev/null");
    try {
        recorder.prepare();
        recorder.start();
    } catch (IllegalStateException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
public void stop() {
    try {
        recorder.stop();
        recorder.release();
        recorder = null;
    } catch (Exception e) {
        e.printStackTrace();
public double getAmplitude() {
    try {
        return recorder.getMaxAmplitude();
    } catch (Exception e) {
        return 0;
}

public class MainActivity extends AppCompatActivity {
    MediaRecorder mMediaRecorder;
    private int amplitudeValue = 0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mMediaRecorder = new MediaRecorder();
        start(mMediaRecorder);
    public void start(MediaRecorder recorder) {
        recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
        recorder.setOutputFile("/dev/null");
        Timer timer = new Timer();
        timer.scheduleAtFixedRate(new RecorderTask(recorder), 0, 1000);// will update Max Amplitude Value every 1 second
        try {
            recorder.prepare();
            recorder.start();
        } catch (IllegalStateException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
    private class RecorderTask extends TimerTask { ;
        private MediaRecorder recorder;
        public RecorderTask(MediaRecorder recorder) {
            this.recorder = recorder;

MediaRecorder.getMaxAmplitude()总是返回0.0

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