Android 从原始文件夹播放声音

我试着从原始文件夹播放一个声音，我试着做什么-

    Uri alert = Uri.parse("android.resource://" + this.getPackageName() + "/" + R.raw.ring_tone);
    mMediaPlayer = new MediaPlayer();
    AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
    try {
        mMediaPlayer.setDataSource(this, alert);
        mMediaPlayer.setVolume(Float.parseFloat(Double.toString(am.getStreamVolume(AudioManager.STREAM_NOTIFICATION) / 7.0)),
                Float.parseFloat(Double.toString(am.getStreamVolume(AudioManager.STREAM_NOTIFICATION) / 7.0)));

        mMediaPlayer.setLooping(true);
        mMediaPlayer.prepare();
        mMediaPlayer.start();

        Handler handler = new Handler();
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                mMediaPlayer.stop();
                mMediaPlayer.release();
            }
        }, 1000 * 60);

但是我得到了一个例外

E/MediaPlayer﹕ Uri是D/MediaPlayer﹕ start（）mUri是

我正在根据请求添加日志-

06-27 11:00:00.118 26004-26004/com.altaoferta.reunio D/ActivityThread﹕ SetTargetSeapUtilization:0.25
06-27 11:00:00.118 26004-26004/com.altaoferta.reunio D/ActivityThread﹕ SetTargetTheApidealFree:8388608
06-27 11:00:00.118 26004-26004/com.altaoferta.reunio D/ActivityThread﹕ setTargetHeapConcurrentStart:2097152
06-27 11:00:00.358 26004-26004/com.altaoferta.reunio D/dalvikvm﹕ GC_FOR_ALLOC freed 97K，37%free 12543K/19779K，暂停26ms，总计26ms
06-27 11:00:00.378 26004-26004/com.altaoferta.reunio I/dalvikvm堆﹕ 对于6551056字节分配，将堆（frag大小写）增加到27.252MB
06-27 11:00:00.408 26004-26008/com.altaoferta.reunio D/dalvikvm﹕ GC_并发释放1K，28%释放18939K/26183K，暂停7ms+4ms，总计28ms
06-27 11:00:00.438 26004-26004/com.altaoferta.reunio E/MediaPlayer﹕ Uri是
06-27 11:00:00.478 26004-26004/com.altaoferta.reunio D/MediaPlayer﹕ 开始（）穆里是
06-27 11:00:00.568 26004-26004/com.altaoferta.reunio D/libEGL﹕ 已加载/system/lib/egl/libEGL_adreno200.so
06-27 11:00:00.588 26004-26004/com.altaoferta.reunio D/libEGL﹕ loaded/system/lib/egl/libGLESv1_CM_adreno200.so
06-27 11:00:00.588 26004-26004/com.altaoferta.reunio D/libEGL﹕ loaded/system/lib/egl/libGLESv2_-adreno200。因此

请张贴日志check@codeprocessor任何更新都知道你。。。让我查一下