java - 如何暂停播放并停止来自parse.com(android)的音频文件流？

Question

我正在尝试在parse.com的应用程序中播放音频。我能够启动和播放媒体文件，但无法暂停和停止它。这是代码:

ParseQuery<ParseObject> query = ParseQuery.getQuery("Table");
query.getInBackground(ObjId, new GetCallback<ParseObject>() {
public void done(ParseObject recording, com.parse.ParseException e) {
    if (e != null) { 
       //do nothing
    }
    else {
        ParseFile audioFile = recording.getParseFile("Audio"); 
        String audioFileURL = audioFile.getUrl();
        mediaPlayer = new MediaPlayer();
        mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
        try {
            mediaPlayer.setDataSource(audioFileURL);
            mediaPlayer.prepare();
              //mediaPlayer.start();
           mediaPlayer.start();

          finalTime = mediaPlayer.getDuration();
          startTime = mediaPlayer.getCurrentPosition();
        } catch (IllegalArgumentException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        } catch (SecurityException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        } catch (IllegalStateException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }        
    }
}
}); 

Answer 1

您不是在播放实时流，而是在对象内部设置操作后下载对象后播放文件。
public void done(ParseObject recording, com.parse.ParseException e)
并且此方法在另一个线程中执行，这使情况变得非常复杂，您应该首先使用以下命令获取文件:

ParseQuery<ParseObject> query = ParseQuery.getQuery("Table");
ParseObject obj = query.getFirst()
ParseFile audioFile = obj.getParseFile("Audio"); 
        String audioFileURL = audioFile.getUrl();
        mediaPlayer = new MediaPlayer();
        mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);

然后实现您的其他功能。