0

我是 android 应用程序开发的新手，这是我的第一个应用程序。我正在构建一个音乐播放器，我有以下方法

public void  playSong(int songIndex){
    // Play song

        mContext = getApplicationContext();
        AudioManager am = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);

        OnAudioFocusChangeListener afChangeListener = new OnAudioFocusChangeListener() {
            public void onAudioFocusChange(int focusChange) {
                if (focusChange == AudioManager.AUDIOFOCUS_LOSS_TRANSIENT){
                    mp.pause();
                } else if (focusChange == AudioManager.AUDIOFOCUS_GAIN) {
                    mp.start();
                } else if (focusChange == AudioManager.AUDIOFOCUS_LOSS) {
                    mp.stop();
                }
            }
        };

        // Request audio focus for playback
        int result = am.requestAudioFocus(afChangeListener,
                                         // Use the music stream.
                                         AudioManager.STREAM_MUSIC,
                                         // Request permanent focus.
                                         AudioManager.AUDIOFOCUS_GAIN);

        if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
            // Start playback.
            try {
                mp.reset();
                mp.setDataSource(songsList.get(songIndex).get("songPath"));
                mp.prepare();
                mp.start();
                String songTitle = songsList.get(songIndex).get("songTitle");
                songTitleLabel.setText(songTitle);

                // Changing Button Image to pause image
                btnPlay.setImageResource(R.drawable.btn_pause);

                // set Progress bar values
                songProgressBar.setProgress(0);
                songProgressBar.setMax(100);

                // Updating progress bar
                updateProgressBar();    
            }
            catch (IllegalArgumentException e) {
                e.printStackTrace();
            } catch (IllegalStateException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

}

当歌曲完成时，它应该开始播放下一首歌曲，但它没有。然后我播放切换到默认媒体播放器并切换回我的应用程序并播放应用程序。我想这与音频焦点有关。如何确定它是否已经具有焦点或释放完成的焦点。谢谢！！

4

1 回答 1

0

你试过这个

              @Override
    public void onCompletion(MediaPlayer arg0) {

        // check for repeat is ON or OFF
        if(isRepeat){
            // repeat is on play same song again
            //playSong(currentSongIndex);
             songPlayOnThread(currentSongIndex);
        } else if(isShuffle){
            // shuffle is on - play a random song
            Random rand = new Random();
            currentSongIndex = rand.nextInt((songsList.size() - 1) - 0 + 1) + 0;
            //playSong(currentSongIndex);
             playsong(currentSongIndex);
        } else{
            // no repeat or shuffle ON - play next song
            if(currentSongIndex < (songsList.size() - 1)){
                String result=playSong(currentSongIndex + 1);
                if(result!="success")
                {
                //  mp.stop();
                //  currentSongIndex=0;
                }
                currentSongIndex = currentSongIndex + 1;
            }else{
                // play first song
            //  playSong(0);
                currentSongIndex = 0;
            }
        }
    }
于 2013-04-25T07:31:20.460 回答