Question

我目前正在尝试设计一个流媒体音乐播放器的简单应用。我有歌曲的网址，我正在设置MediaPlayer，如下所示。第一首歌的一切都还可以，但是当我播放另一首歌时，程序在模拟时没有崩溃，但没有播放，我收到以下错误：

E/MediaPlayer: Attempt to call getDuration without a valid mediaplayer
E/MediaPlayer: error (-38, 0)
E/MediaPlayer: Error (-38,0)

PlayerService.java

public class MusicPlayerService extends Service {
    private SongItem mSong;

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        mSong = ListSong.getListSong().get(ListSong.getSelectedItem());
        registerLocalFilter();
        playMedia();
        return START_STICKY;
    }

    private void playMedia() {
        if (handler == null) {
            thread = new Thread(new Runnable() {
                @Override
                public void run() {
                    Looper.prepare();
                    handler = new Handler();
                    handler.post(playAudioFromURL);
                    Looper.loop();
                }
            });
            thread.start();
        } else {
            handler.post(playAudioFromURL);
        }
    }

    private Runnable playAudioFromURL = new Runnable() {
        @Override
        public void run() {
            if (mediaPlayer != null) {
                mediaPlayer.release();
            }
            mediaPlayer = new MediaPlayer();
            mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
            try {
                mediaPlayer.setDataSource(mSong.getSongUrl());
                mediaPlayer.setOnPreparedListener(onPreparedListener);
                mediaPlayer.setOnCompletionListener(onCompletionListener);
                mediaPlayer.setOnSeekCompleteListener(onSeekCompleteListener);
                mediaPlayer.setOnErrorListener(onErrorListener);
                mediaPlayer.prepareAsync();
            } catch (IOException e) {
                e.printStackTrace();
                Log.w(TAG, "playAudioFromURL: " + e.toString());
            } catch (IllegalArgumentException ex) {
                Log.w(TAG, "playAudioFromURL: " + ex.toString());
            } catch (IllegalStateException ex) {
                Log.w(TAG, "playAudioFromURL: " + ex.toString());
            }
        }
    };


    private MediaPlayer.OnPreparedListener onPreparedListener = new MediaPlayer.OnPreparedListener() {
        @Override
        public void onPrepared(MediaPlayer mp) {
            ListSong.setPlaying(true);
            sendLoadComplete();
            updateTimer();
            mp.start();
        }
    };
}

我在mp.start()中写了onPrepared()并在Media Player called in state 0, error (-38,0)使用mediaPlayer.prepareAsync();解决方案，但它无效。

请帮助我！

Answer 1

在MediaPlayer mediaPlayer.setDataSource(mSong.getSongUrl());中的mediaPlayer.reset();之前，它可能会解决您的问题。

Answer 2

希望对大家有所帮助

mediaPlayer = new MediaPlayer();
mediaPlayer.reset();
        try {
            mediaPlayer.setDataSource(songURL);
            mediaPlayer.prepare();
            mediaPlayer.setOnPreparedListener(mp -> {
                mp.start();
                updateProgressBar();
            });
        } catch (IOException e) {
            e.printStackTrace();
        }

MediaPlayer错误代码（-38,0）getDuration

2 个答案: