如何使用VideoFragment在Leanback上播放视频时将缩放模式设置为全屏

在Leanback上使用VideoFragment播放视频并将缩放模式设置为全屏，您可以按照以下步骤进行操作：

首先，确保您的项目已经包含了Leanback库和相关依赖。您可以在build.gradle文件中添加以下依赖项：

implementation 'androidx.leanback:leanback:1.1.0'
implementation 'androidx.leanback:leanback-preference:1.1.0'
implementation 'androidx.leanback:leanback-presenter:1.1.0'
implementation 'androidx.leanback:leanback-databinding:1.1.0'
implementation 'androidx.leanback:leanback-tab:1.1.0'
implementation 'androidx.leanback:leanback-transition:1.1.0'

创建一个继承自VideoFragment的自定义片段类，并重写onCreateView方法。在onCreateView方法中，设置VideoView的缩放模式为全屏：

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.VideoView;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.leanback.app.VideoFragment;

public class CustomVideoFragment extends VideoFragment {

    private VideoView mVideoView;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View rootView = super.onCreateView(inflater, container, savedInstanceState);

        mVideoView = rootView.findViewById(androidx.leanback.R.id.lb_video_surface);
        mVideoView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                | View.SYSTEM_UI_FLAG_FULLSCREEN
                | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);

        mVideoView.setOnSystemUiVisibilityChangeListener(visibility -> {
            if ((visibility & View.SYSTEM_UI_FLAG_FULLSCREEN) == 0) {
                mVideoView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                        | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                        | View.SYSTEM_UI_FLAG_FULLSCREEN
                        | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                        | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
            }
        });

        return rootView;
    }
}

在您的Activity或Fragment中，使用FragmentManager将自定义的VideoFragment添加到布局中。您可以在onCreate方法或其他适当的地方执行此操作：

import android.os.Bundle;
import androidx.fragment.app.FragmentActivity;
import androidx.fragment.app.FragmentManager;

public class MainActivity extends FragmentActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        FragmentManager fragmentManager = getSupportFragmentManager();
        CustomVideoFragment videoFragment = new CustomVideoFragment();

        fragmentManager.beginTransaction()
                .replace(R.id.fragment_container, videoFragment)
                .commit();
    }
}

请注意，上述代码中的R.id.fragment_container应替换为您要放置VideoFragment的布局容器的ID。

这样，当您在Leanback上播放视频时，视频将以全屏缩放模式展示。

关于VideoFragment的更多详细信息，请参考腾讯云的产品介绍链接地址：腾讯云VideoFragment产品介绍