如何使用 exoplayer 在 vi​​ewpager 中播放一个视频

Posted 2023-04-13

【中文标题】如何使用 exoplayer 在 vi​​ewpager 中播放一个视频

【英文标题】：how to play one video in view pager with exo player

【发布时间】：2020-10-05 22:58:25

【问题描述】：

我正在制作一个应用程序，我在视图寻呼机中使用 exo 播放器播放视频，但问题是我一次无法播放一个视频。一次播放所有视频。我无法在滑动时暂停视频。请帮助。

**this is my activity where i am setting data in view pager**

 ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager(),list);


    viewpager.setAdapter(adapter);

这是我的视图寻呼机

public class ViewPagerAdapter extends FragmentPagerAdapter 

List<VideosModel> list;

public ViewPagerAdapter(FragmentManager fragmentManager, List<VideosModel> list) 
    super(fragmentManager);
    this.list=list;


// Returns total number of pages
@Override
public int getCount() 
    return list.size();


// Returns the fragment to display for that page
@Override
public Fragment getItem(int position) 
    return GlobalFragment.newInstance(list.get(position).getVideo());

这是我获取视频网址并在 exo 播放器中播放的片段

public class GlobalFragment extends Fragment 

public static String video_url;
public static ExoPlayer player;
private PlayerView my_player_view;

public GlobalFragment() 
    // Required empty public constructor


// newInstance constructor for creating fragment with arguments
public static GlobalFragment newInstance(String title) 
    GlobalFragment fragmentFirst = new GlobalFragment();
    Bundle args = new Bundle();
    args.putString(Commn.video_url,title);


    fragmentFirst.setArguments(args);
    return fragmentFirst;


@Override
public void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);

    video_url=getArguments().getString(Commn.video_url);


    Log.e("Videoss","Videoss"+video_url+"");




@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) 
    // Inflate the layout for this fragment
    View view= inflater.inflate(R.layout.fragment_global, container, false);

    iniViews(view);
    setDimension();

    playVideo();


    return view;


private void iniViews(View view) 
    my_player_view=view.findViewById(R.id.my_player_view);
    my_player_view.setRepeatToggleModes(10);


private void playVideo() 
    try 


        BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
        TrackSelector trackSelector = new DefaultTrackSelector(new AdaptiveTrackSelection.Factory(bandwidthMeter));
        player = ExoPlayerFactory.newSimpleInstance(getActivity(), trackSelector);

        Uri videoURI = Uri.parse(video_url);

        DefaultHttpDataSourceFactory dataSourceFactory = new DefaultHttpDataSourceFactory("exoplayer_video");
        ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();
        MediaSource mediaSource = new ExtractorMediaSource(videoURI, dataSourceFactory, extractorsFactory, null, null);

        my_player_view.setPlayer(player);
        player.prepare(mediaSource);
        player.setPlayWhenReady(true);

    catch (Exception e)
        Log.e("MainAcvtivity"," exoplayer error "+ e.toString());
    

private void setDimension() 

    float videoProportion = getVideoProportion();
    int screenWidth = getResources().getDisplayMetrics().widthPixels;
    int screenHeight = getResources().getDisplayMetrics().heightPixels;
    float screenProportion = (float) screenHeight / (float) screenWidth;
    android.view.ViewGroup.LayoutParams lp = my_player_view.getLayoutParams();

    if (videoProportion < screenProportion) 
        lp.height= screenHeight;
        lp.width = (int) ((float) screenHeight / videoProportion);
     else 
        lp.width = screenWidth;
        lp.height = (int) ((float) screenWidth * videoProportion);
    
    my_player_view.setLayoutParams(lp);

private float getVideoProportion()
    return 2f;

【参考方案1】：

int pager fragment layouts 我定义了这个：

                        <com.google.android.exoplayer2.ui.PlayerView
                        android:layout_
                        android:layout_
                        android:orientation="vertical"
                        android:id="@+id/playerView"/>

然后在片段 onCreateView 我添加了这些行：

        PlayerView playerView = v.findViewById(R.id.playerView);
        playerView.getLayoutParams().width = ListPager.widthPixels;
        playerView.getLayoutParams().height = ListPager.widthPixels;
        if(player!=null)
            player.release();
        player = new SimpleExoPlayer.Builder(App.applicationContext).build();
        playerView.setPlayer(player);
        MediaItem mediaItem = MediaItem.fromUri(url);
        player.setMediaItem(mediaItem);
        player.prepare();
        player.play();

【参考方案2】：

我只想将任何未来的读者指向这个 repo，代码太棒了！ https://github.com/nihk/video-pager

【讨论】：

虽然此链接可能会回答问题，但最好在此处包含答案的基本部分并提供链接以供参考。如果链接页面发生更改，仅链接答案可能会失效。 - From Review