这是一个显示视频的 fragment 。

这个 fragment 可以是

1) 在点击按钮上打开一个新 Activity

2) 通过调用替换为另一个 fragment

fragmentManager.beginTransaction().replace(R.id.container, f).addToBackStack(tag).commit();

对于第 1) 种情况，我想调用 player.stopPlayBack() 以在后台停止播放视频

对于第 2) 种情况，我想调用 player.stopPlayBack() 和 player.release() 来终止播放器

问题是，对于情况 1) 和 2) 我应该调用什么事件？我尝试使用 onPause 或 onStop 但它们似乎都没有被触发。

如何解决？

非常感谢您的帮助。

Updated:

视频 fragment 代码

public class Video extends Fragment implements MediaPlayer.OnPreparedListener {
    @Bind(R.id.player) EMVideoView player;
    @Bind(R.id.full_screen) ImageView full_screen;
    Context ctx;
    MyApp app;
    String video_url;
    int intent_code = 5545;
    int pos;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.video, container, false);
        ButterKnife.bind(this, view);

        Bundle bundle = this.getArguments();
        video_url = bundle.getString("video_url");
        String id = bundle.getString("id");

        app = (MyApp) getActivity().getApplicationContext();
        app.record_view(id);

        Main m = (Main)getActivity();
        m.toggle_upload_btn(false);

        pos = 0;

        full_screen.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i = new Intent(getActivity(), VideoFullScreen.class);
                i.putExtra("video_url", video_url);
                i.putExtra("time", (int) player.getCurrentPosition());
                startActivityForResult(i, intent_code); //random intent number
            }
        });

        return view;
    }

    @Override
    public void onPrepared(MediaPlayer mp) {
        player.seekTo(pos);
        player.start();
    }

    @Override
    public void onResume() {
        super.onResume();
        player.setOnPreparedListener(this);
        player.setVideoURI(Uri.parse(video_url));
    }

    @Override
    public void onStop() {
        super.onStop();
        player.stopPlayback();
        //player.release();
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == intent_code) {
            if(resultCode == Activity.RESULT_OK){
                pos = data.getIntExtra("time", 0);
            }
        }
    }

最佳答案

当 fragment 被添加到后台堆栈，然后被替换或删除时——它会像这样:

onPause() -> onSaveInstanceState() -> onStop() -> onDestroyView() 

如果 fragment 被删除，或被替换而没有被添加到返回堆栈，那么会发生以下情况:

onPause() -> onSaveInstanceState() -> onStop() -> onDestroyView()  -> onDestroy() -> onDetach() -> Fragment is destroyed.

当一个 Activity 开始另一个 Activity 时(source):

The order of lifecycle callbacks is well defined, particularly when the two activities are in the same process and one is starting the other. Here's the order of operations that occur when Activity A starts Acivity B:

Activity A's onPause() method executes. Activity B's onCreate(), onStart(), and onResume() methods execute in sequence. (Activity B now has user focus.) Then, if Activity A is no longer visible on screen, its onStop() method executes.

因为您需要在您的 fragment 所在的位置调用您的 Activity ，以开始一个新的 Activity 。

关于android - 调用 fragment 替换或打开新 Activity 时的生命周期？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34783984/