使用MediaRecorder进行录音

public class Recorder {

    private static final int MAX_LENGTH=1000*60*3;//3分钟

    private MediaRecorder recorderl;

    public Recorder()
    {
        initial();
    }

    private void initial() {
        recorderl=new MediaRecorder();
        String path= Environment.getExternalStorageDirectory().getAbsolutePath()+"/test.amr";
        recorderl.setAudioSource(MediaRecorder.AudioSource.MIC);
        recorderl.setOutputFormat(MediaRecorder.OutputFormat.RAW_AMR);
        recorderl.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
        recorderl.setMaxDuration(MAX_LENGTH);
        recorderl.setOutputFile(path);
    }

    public void startRecorder() {
        initial();
        try {
            recorderl.prepare();
        } catch (IOException e) {
            e.printStackTrace();
        }
        recorderl.start();
    }

    public void stopRecorder() {
        if(recorderl!=null)
        {
            recorderl.stop();
            recorderl.release();
        }
        recorderl=null;
    }


    public void startRecorderVoice()
    {
        handler.postDelayed(run,200);
    }

    public void stopRecorderVoice()
    {
        handler.removeCallbacks(run);
    }

    private Handler handler=new Handler();

    private Runnable run=new Runnable() {
        @Override
        public void run() {
            Log.i("view","test"+recorderl.getMaxAmplitude());
            handler.postDelayed(run,200);
        }
    };
}