CardView未在Android

Question

我在我的应用程序中使用了Youtube API以及FirebaseRecyclerAdapter和RecyclerView，由于某些原因我的YouTube缩略图没有显示在我的应用程序中，尽管我已将其添加到我的CardView和我的FirebaseRecyclerAdapter有代码可以访问CardView但是当我启动我的应用程序并转到该活动时，那里没有显示缩略图。我已经将它实现为没有Firebase适配器的硬编码。

我尝试过的步骤：

1. 添加了布局管理器

2. 调整cardView和thumbnailView的高度和宽度

我正在使用Android Studio

YouTube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) {

                        }

                    });
        }

    }
}

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>

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视图太大，无法添加到recyclerview中。因此，请使用YouTubeThumbnailView显示缩略图。当用户点击其中一个时，您可以使用YouTubeplayerView视图启动YouTubePlayerFragment或活动。

下面是参考代码，

xml中的

：

<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中：

// 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) {
            }
       });