MediaRecorder不适用于三星A8设备上的Android 5.1.1

Question

我正在从我的Android应用程序录制语音呼叫，每件事情都按预期工作但是当我在Android 5.1.1下在三星A8上测试时，我得到了一个非法状态异常，这是我的代码：

public MediaRecorder startRecordCall(String contactName, String contactE164Phone, String callType, Date callTime){
    if (!isRecording){
        try {
            Toast.makeText(this, R.string.ancare_service_recording_started, Toast.LENGTH_LONG).show();
            extractRecordingSettings();
            pCurrentAudioVolume = pAudioManager.getStreamVolume(AudioManager.STREAM_VOICE_CALL);
            int pMaxVolume = pAudioManager.getStreamMaxVolume(AudioManager.STREAM_VOICE_CALL);
            int vol = pMaxVolume;
            switch (pAudioVolume) {
                case 0:
                    vol = 1;
                    break;
                case 1:
                    vol = (pMaxVolume / 2) + 1;
                    break;
                case 2:
                    vol = pMaxVolume;
                    break;
            }
            pAudioManager.setStreamVolume(AudioManager.STREAM_VOICE_CALL, vol, 0);
            File currentRecordFile = MyStorage.makeRecordFile(contactName, contactE164Phone, callType, callTime);
            pMediaRecorder = new MediaRecorder();
            pMediaRecorder.setAudioSource(MediaRecorder.AudioSource.VOICE_CALL);
            pMediaRecorder.setOutputFormat(pAudioFormat);
            pMediaRecorder.setOutputFile(currentRecordFile.getPath());
            pMediaRecorder.setAudioEncoder(pAudioCodec);
            pMediaRecorder.setMaxDuration(pAudioDuration * 1000);
            pMediaRecorder.setMaxFileSize(pAudioSize * 1024);
            pMediaRecorder.prepare();
            pMediaRecorder.start();
            pCurrentRecordStartTime = System.currentTimeMillis();
            pCurrentObserver = new RecordObserver(this, currentRecordFile.getAbsolutePath());
            pCurrentObserver.startWatching();
            isRecording = true;
        }catch (IllegalStateException isex) {
            Toast.makeText(this, R.string.ancare_service_recording_failed, Toast.LENGTH_LONG).show();
            isRecording = false;
            if(pMediaRecorder != null){
                pMediaRecorder.release();
                pMediaRecorder = null;
            }
        }catch(IOException ioex) {
            Toast.makeText(this, R.string.ancare_service_recording_failed, Toast.LENGTH_LONG).show();
            isRecording = false;
            if(pMediaRecorder != null){
                pMediaRecorder.release();
                pMediaRecorder = null;
            }
        }
    }
    return pMediaRecorder;
}
public void stopRecordCall(){
    if(isRecording){
        long callDuration = System.currentTimeMillis() - pCurrentRecordStartTime;
        pCurrentObserver.setCallDuration(callDuration);
        pMediaRecorder.stop();
        pMediaRecorder.release();
        pMediaRecorder = null;
        isRecording = false;
        Toast.makeText(this, R.string.ancare_service_recording_succeeded, Toast.LENGTH_LONG).show();
        pAudioManager.setStreamVolume(AudioManager.STREAM_VOICE_CALL, pCurrentAudioVolume, 0);
    }
}

在Android 5.1.1上是否有任何改变，或者它来自我的代码，