java.lang.RuntimeException: setAudioSource failed Google Gui

Question

这是我的代码，实际上是谷歌开发者Android指南的代码。但是这段代码抛出错误"java.lang. "RuntimeException: setAudioSource failed."。我试过了所有的解，仍然有误差。

private static final String LOG_TAG = "AudioRecordTest";
private static String mFileName = null;
private RecordButton mRecordButton = null;
private MediaRecorder mRecorder = null;
private PlayButton   mPlayButton = null;
private MediaPlayer   mPlayer = null;
private void onRecord(boolean start) {
    if (start) {
        startRecording();
    } else {
        stopRecording();
    }
}
private void onPlay(boolean start) {
    if (start) {
        startPlaying();
    } else {
        stopPlaying();
    }
}
private void startPlaying() {
    mPlayer = new MediaPlayer();
    try {
        mPlayer.setDataSource(mFileName);
        mPlayer.prepare();
        mPlayer.start();
    } catch (IOException e) {
        Log.e(LOG_TAG, "prepare() failed");
    }
}
private void stopPlaying() {
    mPlayer.release();
    mPlayer = null;
}
private void startRecording() {
    mRecorder = new MediaRecorder();
    mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);  // This row is throwing error. 
    mRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
    mRecorder.setOutputFile(mFileName);
    mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    try {
        mRecorder.prepare();
    } catch (IOException e) {
        Log.e(LOG_TAG, "prepare() failed");
    }
    mRecorder.start();
}
private void stopRecording() {
    mRecorder.stop();
    mRecorder.release();
    mRecorder = null;
}
class RecordButton extends Button {
    boolean mStartRecording = true;
    OnClickListener clicker = new OnClickListener() {
        public void onClick(View v) {
            onRecord(mStartRecording);
            if (mStartRecording) {
                setText("Stop recording");
            } else {
                setText("Start recording");
            }
            mStartRecording = !mStartRecording;
        }
    };
    public RecordButton(Context ctx) {
        super(ctx);
        setText("Start recording");
        setOnClickListener(clicker);
    }
}
class PlayButton extends Button {
    boolean mStartPlaying = true;
    OnClickListener clicker = new View.OnClickListener() {
        public void onClick(View v) {
            onPlay(mStartPlaying);
            if (mStartPlaying) {
                setText("Stop playing");
            } else {
                setText("Start playing");
            }
            mStartPlaying = !mStartPlaying;
        }
    };
    public PlayButton(Context ctx) {
        super(ctx);
        setText("Start playing");
        setOnClickListener(clicker);
    }
}
public MainActivity() {
    mFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
    mFileName += "/audiorecordtest.mp4";
}
@Override
public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    LinearLayout ll = new LinearLayout(this);
    mRecordButton = new RecordButton(this);
    ll.addView(mRecordButton,
            new LinearLayout.LayoutParams(
                    ViewGroup.LayoutParams.WRAP_CONTENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT,
                    0));
    mPlayButton = new PlayButton(this);
    ll.addView(mPlayButton,
            new LinearLayout.LayoutParams(
                    ViewGroup.LayoutParams.WRAP_CONTENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT,
                    0));
    setContentView(ll);
}
@Override
public void onPause() {
    super.onPause();
    if (mRecorder != null) {
        mRecorder.release();
        mRecorder = null;
    }
    if (mPlayer != null) {
        mPlayer.release();
        mPlayer = null;
    }
}

}

这是我的Android Manifest

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<uses-permission android:name="android.permission.RECORD_AUDIO"></uses-permission>
<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

请帮助。我花了三天时间解决这个问题。

Answer 1

我解决了这个问题。Android 6.0之后，Android权限的使用方式发生了变化。我在代码中添加了这个方法:

private boolean Permissions(){
        int permissionWRITE_EXTERNAL_STORAGE = ContextCompat.checkSelfPermission(this, android.Manifest.permission.WRITE_EXTERNAL_STORAGE);
        int permissionRECORD = ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO);
        List<String> listPermissionsNeeded = new ArrayList<>();
        if (permissionWRITE_EXTERNAL_STORAGE != PackageManager.PERMISSION_GRANTED) {
            listPermissionsNeeded.add(android.Manifest.permission.WRITE_EXTERNAL_STORAGE);
        }
        if (permissionRECORD != PackageManager.PERMISSION_GRANTED) {
            listPermissionsNeeded.add(android.Manifest.permission.RECORD_AUDIO);
        }
        if (!listPermissionsNeeded.isEmpty()) {
            ActivityCompat.requestPermissions(this, listPermissionsNeeded.toArray(new String[listPermissionsNeeded.size()]), REQUEST_ID_MULTIPLE_PERMISSIONS);
            return false;
        }
        return  true;

    }

在我的onCreate方法中使用这个方法。

if (!Permissions()) {
            return;
        }