BottomSheetDialog 沉浸式导航栏不生效

使用BottomSheetDialog 时底部导航栏、手势条部分颜色会显示变暗，影响视觉体验
试了各种沉浸式方法，都没办法生效

此方法用 LayerDrawable 替换了窗口背景，该 LayerDrawable 包含两个元素：背景暗淡和导航栏背景

@RequiresApi(api = Build.VERSION_CODES.M)
private void setWhiteNavigationBar(@NonNull Dialog dialog) {
    Window window = dialog.getWindow();
    if (window != null) {
        DisplayMetrics metrics = new DisplayMetrics();
        window.getWindowManager().getDefaultDisplay().getMetrics(metrics);

        GradientDrawable dimDrawable = new GradientDrawable();
        // ...customize your dim effect here

        GradientDrawable navigationBarDrawable = new GradientDrawable();
        navigationBarDrawable.setShape(GradientDrawable.RECTANGLE);
        navigationBarDrawable.setColor(Color.WHITE);

        Drawable[] layers = {dimDrawable, navigationBarDrawable};

        LayerDrawable windowBackground = new LayerDrawable(layers);
        windowBackground.setLayerInsetTop(1, metrics.heightPixels);

        window.setBackgroundDrawable(windowBackground);
    }
}

对比效果：

image.png

参考链接：

https://stackoverflow.com/questions/47553936/prevent-bottomsheetdialogfragment-covering-navigation-bar