android记录在果冻豆中的通话声音非常差

Question

我已开发出用于录制呼叫的应用程序，并且在录音带中录制的语音在质量上比在姜饼os.Android应用程序代码中记录的语音质量要差，我用它来录制语音如下。

public void StartRecording(){
        try
        {
         GlobalValues.recorder = new MediaRecorder();
         GlobalValues.recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
         GlobalValues.recorder.setOutputFormat(MediaRecorder.OutputFormat.RAW_AMR);
         GlobalValues.recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
         GlobalValues.recorder.setOutputFile(this.getFullSdPath());
         try {
            Log.e("start recordng", GlobalValues.strRunningRecordNo);
            GlobalValues.recorder.prepare();
        } catch (IllegalStateException ex1) {
            dbHelper.InsertErrors(ex1);
            log.WriteErrors(ex1,"StartRecording-prepare");

        } catch (IOException ex2) {
            dbHelper.InsertErrors(ex2);
            log.WriteErrors(ex2,"StartRecording-prepare-IO");           
        }
         GlobalValues.recorder.start();   // Recording is now started

        }catch(Exception ex){  
            dbHelper.InsertErrors(ex);
            log.WriteErrors(ex,"StartRecording-start");

        }
    }

public void StopRecording(){
        try{
            GlobalValues.recorder.stop();
            Log.i("stopped", "stoprecording");
            GlobalValues.recorder.reset();   
            Log.i("reset", "stoprecording");
            GlobalValues.recorder.release();
            Log.i("released", "stoprecording");
            CallState = false;

        }catch(Exception ex)
        {
            Log.i(ex.toString(), "stoprecording");
            dbHelper.InsertErrors(ex);
            log.WriteErrors(ex,"StopRecording()");          
        }
    }

如果您有任何解决方案，请发布。