如何在视图分页器中的片段内处理MediaPlayer对象 [英] How to handle MediaPlayer object inside a fragment inside view pager

问题描述

我有一个viewpager来保存片段，每个片段都具有MediaPlayer对象，即每个片段都具有附加的音频.我的要求是，如果我滑动Viewpager，当前片段媒体播放器应停止播放，而下一个片段媒体播放器应播放.如果我向后滑动viewpager，则当前的片段媒体播放器应停止并且先前的片段媒体播放器应启动.不必在每个片段上都附加音频，这就是为什么每个片段都具有自己的媒体播放器对象，而我已经检查了音频以处理它.到目前为止，我已经尝试过以下代码

I have viewpager which holds fragments, each fragment is having MediaPlayer object i.e each fragment is having audio attached to it. My requirement is if i swipe the viewpager,current fragment media player should stop and next fragment media player should play. If i swipe viewpager backwards then current fragment media player should stop and previous fragment media player should start. It is not necessary that each fragment should have a audio attached to it so thats why each fragment is having own media player object and i have put the check for audio to handle it. so far i have tried below code

在每个片段中进行可见性检查并相应地播放音频，

In each fragment is having a visibility check and play the audio accordingly,

@Override
    public void setUserVisibleHint(boolean isVisibleToUser) {
        super.setUserVisibleHint(isVisibleToUser);
        if (isVisibleToUser) {
            if (mPlayer != null ) {
                mPlayer.start();
            }
        } else {
            if (mPlayer != null && mPlayer.isPlaying()) {
                mPlayer.pause();
                mPlayer.seekTo(0);
            }
        }
    }

如果我在片段的OnStop中释放媒体播放器对象，那么如果我再次遇到相同的片段，音频将停止工作.

If i release media player object in OnStop of fragment then audio stop working if i comes again to same fragment.

  @Override
    public void onStop() {
        if (mPlayer != null && mPlayer.isPlaying()) {
            mPlayer.stop();
            mPlayer.reset(); // Might not be necessary, since release() is called right after, but it doesn't seem to hurt/cause issues
            mPlayer.release();
            mPlayer = null;
        }
        super.onStop();
    }

该如何解决?我不知道如何在viewpager片段的内部控制媒体播放器.

How to resolve this ? I dont know how to control media player inside fragment of a viewpager.

推荐答案

最好在片段中重写onPause()和onResume().并且我们需要为媒体播放器保存当前位置.因此，我正在使用共享首选项来保存媒体播放器的位置.
在onCreateView, mediaPlayer_position = getActivity().getSharedPreferences("PLAY_PAUSE", Activity.MODE_PRIVATE).getInt("CHECK_PLAY_PAUSE", 0);

It is better to override onPause() and onResume() in fragment. And we need to save the current position for media player. So, I am using the shared preference to save the position for media player.
In onCreateView, mediaPlayer_position = getActivity().getSharedPreferences("PLAY_PAUSE", Activity.MODE_PRIVATE).getInt("CHECK_PLAY_PAUSE", 0);

@Override
public void onResume() {
    super.onResume();

    int position = getActivity().getSharedPreferences("PLAY_PAUSE", Activity.MODE_PRIVATE).getInt("CHECK_PLAY_PAUSE", 0);
    if(position > 0) {
        try {
            mediaPlayer.setDataSource(mp3_link); //mp3_link from url to mediaplayer data source
            mediaPlayer.prepare(); 
        } catch (Exception e) {
            e.printStackTrace();
        }

        mediaPlayer.seekTo(position);
        mediaPlayer.start();
    }
}

@Override
public void onPause() {
    super.onPause();
    if(mediaPlayer.isPlaying()) {
        mediaPlayer_position = mediaPlayer.getCurrentPosition();
        getActivity().getSharedPreferences("PLAY_PAUSE", Context.MODE_PRIVATE).edit().putInt("CHECK_PLAY_PAUSE", mediaPlayer_position).apply();
        mediaPlayer.pause();
    }  
}

参考:" https://www.hrupin.com/2011/02/example-of-streaming-mp3-mediafile-with-android-mediaplayer-class "

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