Question

我正在MainActivity的onCreate（）方法中创建一个MediaPlayer实例

 MediaPlayer mPlayer = MediaPlayer.create(this, Uri.fromFile(new File("/storage/emulated/0/soundrecorder/My recording #26.wav")));

它已成功创建但我收到此错误：

07-06 18:33:44.266 18366-18366/com.audiorecorder.wel.voicerecorder E/MediaPlayer-JNI: JNIMediaPlayerFactory: bIsQCMediaPlayerPresent 0
07-06 18:33:44.267 18366-18366/com.audiorecorder.wel.voicerecorder E/MediaPlayer-JNI: JNIMediaPlayerFactory: bIsQCMediaPlayerPresent 0

还试过这个但是logcat上的错误：

MediaPlayer mp = new MediaPlayer();
    try {
        mp.setDataSource(this, Uri.fromFile(new File("/storage/emulated/0/soundrecorder/My recording #26.wav")));
    } catch (IOException e) {
        e.printStackTrace();
    }
    mp.prepareAsync();
    mp.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
        @Override
        public void onPrepared(MediaPlayer mp) {
            mp.start();
        }
    });

我尝试过不同格式的不同音频文件，但结果是同样的错误。我也尝试在stackoverflow上搜索答案，但无法解决问题。你能帮我解决这个问题吗？

Answer 1

您的文件似乎存在问题。用此更新：

musicUri = android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;

然后按照以下步骤操作：

    1.  getLoaderManager().initLoader(0,null,this);
    2.  @Override
        public Loader<Cursor> onCreateLoader(int id, Bundle args) {
            switch (id){
                case 0 : return new CursorLoader(getApplicationContext(),musicUri,null,null,null,null);        
            return new Loader<>(this);
        }

3. @Override
    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
        switch (loader.getId()) {
            case 0 :
                if(data != null && data.moveToFirst()) {
                    songTitleColumnIndex = data.getColumnIndex(MediaStore.Audio.Media.TITLE);
                    do {
                        songTitle = data.getString(songTitleColumnIndex);
                        songsList.add(songTitle);
                    } while (data.moveToNext());
                }
                break;

因此SongTitles被放入SongList中，这是一个字符串类型的ArraList。

希望这有助于。

Answer 2

尝试使用FileInputStream来改为使用FileDescriptor启动MediaPlayer：

String yourFilePath = "/wherever/your/file/is.wav";

MediaPlayer mPlayer = new MediaPlayer();

try{
    FileInputStream inputStream = new FileInputStream(yourFilePath);
    mPlayer.setDataSource(inputStream.getFD());
    inputStream.close();

    mPlayer.prepare();
    mPlayer.start();

}catch (IOException e){
    Log.e("IOException", e.getMessage());
}

Android MediaPlayer未知错误

2 个答案: