public class Recorder {

    private static final int MAX_LENGTH=1000*60*3;//3分鐘
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);
}
    };

}

每次start前記得initial,不然連續點選會出現stop,start這些錯誤

這是因為stop或者release後，MediaRecorder被回收了，不能重新start