使用VideoFragment在Leanback上播放视频时如何设置缩放模式以拉伸到全屏

Question

没有ExoPlayer的Google Leanback showcase视频播放器

带有ExoPlayer的Google Leanback showcase视频播放器

我已经尝试了Google的leanback展示柜，它也以“适合屏幕显示”模式播放视频，并且两侧带有黑条。我也找不到在API文档的任何位置更改缩放模式的选项

Answer 1

我不得不调查VideoFragment来源以弄清楚这一点。 VideoFragment有一个简单的SurfaceView作为其布局的根元素，您要做的就是使SurfaceView与父级（即设备屏幕）的宽度和高度匹配。为此，只需覆盖onVideoSizeChanged并使用getSurfaceView获取对SurfaceView中使用的程序包专用VideoFragment实例的引用。

@Override
protected void onVideoSizeChanged(int width, int height) {
    switch (scaleMode) {
        //Flag indicates that this video should stretch to screen
        case MediaMetaData.SCALE_MODE_STRETCH:  
            View rootView = getView();
            SurfaceView surfaceView = getSurfaceView();
            ViewGroup.LayoutParams params = surfaceView.getLayoutParams();
            params.height = rootView.getHeight();
            params.width = rootView.getWidth();
            surfaceView.setLayoutParams(params);
            break;
        //When the video shouldn't stretch, just invoke super to have the VideoFragment's default behavior which is fit to screen
        default:                            
            super.onVideoSizeChanged(width, height);
    }
}