CardView未在Android中显示Youtube缩略图

Question

我在我的应用程序中随FirebaseRecyclerAdapter和RecyclerView一起使用了Youtube API，出于某些原因，我的YouTube缩略图未显示在我的应用程序中，尽管我已将它添加到我的CardView中， FirebaseRecyclerAdapter有访问CardView的代码，但是当我启动我的应用程序并转到该活动时，那里没有显示任何缩略图。如果没有Firebase适配器，我已将其实施为硬编码。

步骤我都试过：

1. 新增布局管理器

2. 调整cardView和thumbnailView

   的高度和宽度

我使用过Android Studio

YouTube的类文件：

public class YoutubeVideos extends YouTubeBaseActivity { 

    private RecyclerView YouRecycler; 
    private DatabaseReference YDatabaseReference; 


    @Override 
    protected void onCreate(Bundle bundle) { 
     super.onCreate(bundle); 
     setContentView(R.layout.youtube_videos); 
     YDatabaseReference = FirebaseDatabase.getInstance().getReference().child("youtubed"); 
     YouRecycler = (RecyclerView)findViewById(R.id.Youtube_recycler); 

    } 

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

    FirebaseRecyclerAdapter<post2youtube, YoutubeViewHolder> YfirebaseRecyclerAdapter = new FirebaseRecyclerAdapter<post2youtube, YoutubeViewHolder>(

      post2youtube.class, 
      R.layout.youtube_videos_card, 
      YoutubeViewHolder.class, 
      YDatabaseReference 
    ) { 
     @Override 
     protected void populateViewHolder(YoutubeViewHolder viewHolder, post2youtube model, int position) { 
      viewHolder.setYoutube(model.getYoutube()); 
     } 

    }; 

      YouRecycler.setAdapter(YfirebaseRecyclerAdapter); 
    }  


    public static class YoutubeViewHolder extends RecyclerView.ViewHolder { 
     View yView; 

     public YoutubeViewHolder(View YitemView) { 
      super(YitemView); 
      yView = YitemView; 
     } 
     public void setYoutube(final String youtube){ 
      final YouTubePlayerView youPlay = (YouTubePlayerView) yView.findViewById(R.id.youtuber); 
      youPlay.initialize("Some key", 
        new YouTubePlayer.OnInitializedListener() { 
         @Override 
         public void onInitializationSuccess(YouTubePlayer.Provider provider, YouTubePlayer youTubePlayer, boolean b) { 
          youTubePlayer.loadVideo(youtube); 
         } 

         @Override 
         public void onInitializationFailure(YouTubePlayer.Provider provider, YouTubeInitializationResult youTubeInitializationResult) { 

         } 

        }); 
     } 

    } 
} 

的YouTube RecyclerView文件：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 


    <android.support.v7.widget.RecyclerView 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:id ="@+id/Youtube_recycler"/> 

</LinearLayout> 

的YouTube cardView XML文件：

<?xml version="1.0" encoding="utf-8"?> 
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/youtube_cardView" 
    android:layout_width="match_parent" android:layout_height="match_parent"> 

<RelativeLayout 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical"> 


    <com.google.android.youtube.player.YouTubePlayerView 
     android:id="@+id/youtuber" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" /> 


</RelativeLayout> 

</android.support.v7.widget.CardView> 

Answer 1

YoutubePlayer观点是太大，被添加到recyclerview.So使用YouTubeThumbnailView来显示缩略图LS。当用户点击其中的一个时，您可以启动YouTubePlayerFragment或带有YouTubeplayerView视图的活动。

下面是参考代码，

在XML

：

<com.google.android.youtube.player.YouTubeThumbnailView 
        android:id="@+id/youtube_view" 
        android:layout_width="match_parent" 
        android:layout_height="180dp" 
        android:layout_marginBottom="@dimen/ten_dp" 
        android:visibility="gone"/> 

在Java：

// Initializing video player with developer key 
    youtube_view.initialize(Config.DEVELOPER_KEY, new YouTubeThumbnailView.OnInitializedListener() { 
     @Override 
     public void onInitializationSuccess(YouTubeThumbnailView youTubeThumbnailView, final YouTubeThumbnailLoader youTubeThumbnailLoader) { 
     youTubeThumbnailLoader.setVideo(videoId); 
     youTubeThumbnailLoader.setOnThumbnailLoadedListener(new YouTubeThumbnailLoader.OnThumbnailLoadedListener() { 
      @Override 
      public void onThumbnailLoaded(YouTubeThumbnailView youTubeThumbnailView, String s) { 
       youTubeThumbnailLoader.release(); 
       Toast.makeText(getActivity(), "It's a valid youtube url.", Toast.LENGTH_SHORT).show(); 
      } 
      @Override 
      public void onThumbnailError(YouTubeThumbnailView youTubeThumbnailView, YouTubeThumbnailLoader.ErrorReason errorReason) { 
       try { 
         Toast.makeText(getActivity(), "Not a valid youtube url.", Toast.LENGTH_SHORT).show(); 
        } catch (Exception ex) { 
          ex.printStackTrace(); 
        } 
       } 
       }); 
      } 
      @Override 
      public void onInitializationFailure(YouTubeThumbnailView youTubeThumbnailView, YouTubeInitializationResult youTubeInitializationResult) { 
      } 
     });