如何在我的SupportFragment中添加YouTube播放器？

Question

我的XML代码：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    style="@style/Container.MainBackground"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <fragment android:name="com.google.android.youtube.player.YouTubePlayerSupportFragment"
        android:layout_alignParentTop="true"
        android:id="@+id/youtube_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
</RelativeLayout>

片断中的代码

public class VideoFragment extends YouTubePlayerSupportFragment implements YouTubePlayer.OnInitializedListener {

    static private final String DEVELOPER_KEY = "MyKey";
    static private final String VIDEO = "ToMpzhdUD1Q";
    static private final String VIDEO1 = "K77avo920Jc";
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View videoView = inflater.inflate(R.layout.video_fragment, container, false);
        getActivity().setTitle("Youtube");

        YouTubePlayerSupportFragment youTubePlayerSupportFragment = new YouTubePlayerSupportFragment();
        youTubePlayerSupportFragment.initialize(DEVELOPER_KEY, this);

        return videoView;
    }

    @Override
    public void onInitializationSuccess(YouTubePlayer.Provider provider, YouTubePlayer youTubePlayer, boolean b) {

        List<String> list = new ArrayList<>();
        list.add(VIDEO);
        list.add(VIDEO1);
        youTubePlayer.setPlayerStyle(YouTubePlayer.PlayerStyle.DEFAULT);
        youTubePlayer.cueVideos(list);

    }

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

        Toast.makeText(getContext(), "FAIL!" + youTubeInitializationResult.toString(), Toast.LENGTH_LONG)
                .show();

    }
}

getSupportFragmentManager().beginTransaction().replace(R.id.main_container,fragment).addToBackStack(null).commit();

java.lang.NullPointerException：试图对com.google.Android.YouTube.Player.YouTubePlayerSupportFragment.OnStart（未知源）上的空对象引用调用虚拟方法“void com.google.Android.YouTube.Player.YouTubePlayerView.a（）”

Answer 1

这里的问题是，您覆盖了超级类YouTubePlayerSupportFragment中的onCreateView（）方法，该方法不是抽象的，实际上有一个实现，如图所示：

    public View onCreateView(LayoutInflater var1, ViewGroup var2, Bundle var3) {
        this.c = new YouTubePlayerView(this.getActivity(), (AttributeSet)null, 0, this.a);
        this.a();
        return this.c;
    }

实际的变量名称和类型超出了本答案的范围。这里重要的是YouTubePlayerView在这里被实例化，并且您覆盖了该方法，因此当在onStart（）方法中调用时（也在YouTubePlayerSupportFragment中找到）YouTubePlayerView是空的。

    public void onStart() {
        super.onStart();
        this.c.a();
    }

因此，基本上，您需要的唯一事情是实例化您的VideoFragment类，并且，如果您想要实际的视频，而不是黑盒，您需要在创建片断时初始化片断（像这样：）

    public VideoFragment()
    {
        this.initialize("yourAPIKeyHere", this);
    }