Java – Android: the sampling microphone does not record to obtain real-time amplitude / level?

I'm trying to get the microphone amplitude level on Android:

MediaRecorder recorder = new MediaRecorder();
recorder.setAudioSource(MediaRecorder.AudioSource.MIC);

Timer timer = new Timer();
timer.scheduleAtFixedRate(new RecorderTask(recorder),1000);

private class RecorderTask extends TimerTask {
    private MediaRecorder recorder;

    public RecorderTask(MediaRecorder recorder) {
        this.recorder = recorder;
    }

    public void run() {
        Log.v("MicInfoService","amplitude: " + recorder.getMaxAmplitude());
    }
}

Unfortunately, this will only always return 0

It seems that for this job, I must actually start recording Is that right?

If so, do I need to record 500ms, get the amplitude, stop recording and repeat?

Finally, do I have to record to a file? I don't need to save this audio file. I can't get the current amplitude or maximum amplitude from the last call input by the current microphone without recording?

Thank you for any help

resolvent

Solution

Yes, you must call recorder first Start (), you can't forget to call recorder. at the end. stop()！

For a sample application, see http://code.google.com/p/android-labs/source/browse/trunk/NoiseAlert/src/com/google/android/noisealert/ , you may need to check soundmeter Java and noisealert java

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