如何使用Leanback库在Android电视中创建顶部导航栏

implementation 'androidx.leanback:leanback:1.1.0'

public class MainActivity extends BrowseFragment {
    // ...
}

<androidx.leanback.widget.BrowseFrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
</androidx.leanback.widget.BrowseFrameLayout>

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

    // 设置导航栏标题
    setTitle("顶部导航栏");

    // 设置导航栏样式
    setHeadersState(HEADERS_ENABLED);
    setHeadersTransitionOnBackEnabled(true);

    // ...
}

@Override
public void onCreate(Bundle savedInstanceState) {
    // ...

    // 创建导航栏行
    ArrayObjectAdapter rowsAdapter = new ArrayObjectAdapter(new ListRowPresenter());

    // 创建行标题
    HeaderItem header = new HeaderItem(0, "行标题");

    // 创建行中的项
    ArrayObjectAdapter rowAdapter = new ArrayObjectAdapter(new CardPresenter());
    rowAdapter.add(new MyItem("项1"));
    rowAdapter.add(new MyItem("项2"));

    // 将行添加到导航栏适配器中
    rowsAdapter.add(new ListRow(header, rowAdapter));

    // 设置导航栏适配器
    setAdapter(rowsAdapter);

    // ...
}

public class MyItem {
    private String title;
    private Drawable image;

    public MyItem(String title) {
        this.title = title;
        // 初始化图片
        // ...
    }

    public String getTitle() {
        return title;
    }

    public Drawable getImage() {
        return image;
    }
}

public class CardPresenter extends Presenter {
    // ...

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent) {
        // 创建自定义项的视图
        View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.item_card, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(ViewHolder viewHolder, Object item) {
        // 绑定自定义项的数据到视图
        MyItem myItem = (MyItem) item;
        ImageCardView cardView = (ImageCardView) viewHolder.view;
        cardView.setTitleText(myItem.getTitle());
        cardView.setMainImage(myItem.getImage());
    }

    // ...
}

<androidx.leanback.widget.ImageCardView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/card_view"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:focusable="true"
    android:clickable="true"
    android:background="?android:attr/selectableItemBackground">
</androidx.leanback.widget.ImageCardView>