Question

我正在下载带DownloadManager的MP3，下载完成后我尝试用MediaPlayer播放MP3。

下载完成后，当我得到length()文件返回ZERO导致我得到java.io.IOException：来自MediaPlayer.setDataSource()的setDataSourceFD失败错误。如果我等待几秒钟然后为MediaPlayer设置数据源，那么工作正常！

public void initMediaPlayer() {
        if (mediaPlayer == null)
            mediaPlayer = new MediaPlayer();
        mediaPlayer.setOnCompletionListener(this);
        mediaPlayer.setOnErrorListener(this);
        mediaPlayer.setOnPreparedListener(this);
        mediaPlayer.setOnBufferingUpdateListener(this);
        mediaPlayer.setOnSeekCompleteListener(this);
        mediaPlayer.setOnInfoListener(this);
        mediaPlayer.reset();
        mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
        mediaPlayer.setWakeMode(getApplicationContext(), PowerManager.PARTIAL_WAKE_LOCK);

        try {
            File audioDir = new File(getExternalFilesDir(AUDIO_SERVICE), activeAudio.getAudioBooksTableOfContentsID() + ".mp3");
            if (audioDir.exists()) {
                FileInputStream is = new FileInputStream(audioDir);
                Log.d("audioDir.length()", String.valueOf(audioDir.length()));

                mediaPlayer.setDataSource(is.getFD()); //audioDir.getPath()

                mediaPlayer.prepareAsync();
                is.close();
            }
        } catch (Exception e) {
            //TODO
            e.printStackTrace();
        }
    }

错误：

W/System.err: java.io.IOException: setDataSourceFD failed.: status=0x80000000
W/System.err:     at android.media.MediaPlayer._setDataSource(Native Method)
W/System.err:     at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1153)
W/System.err:     at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1136)
W/System.err:     at com.example.services.MediaPlayerService.initMediaPlayer(MediaPlayerService.java:280)
W/System.err:     at com.example.services.MediaPlayerService.playNewAudio(MediaPlayerService.java:757)
W/System.err:     at com.example.services.MediaPlayerService.handleIncomingActions(MediaPlayerService.java:718)
at com.example.services.MediaPlayerService.onStartCommand(MediaPlayerService.java:132)
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3327)
at android.app.ActivityThread.-wrap21(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1583)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6121)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779)

抱歉我的英文不好

MediaPlayer.setDataSource（）; java.io.IOException：setDataSourceFD失败

0 个答案: