DecroView的基本使用

最新推荐文章于 2024-08-13 17:53:17 发布

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最新推荐文章于 2024-08-13 17:53:17 发布

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分类专栏： Android进阶

本文链接：https://blog.youkuaiyun.com/qq_34203494/article/details/54021934

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本文提供了一个关于DecorView的示例代码，展示了如何通过DecorView进行界面元素的添加、移除及前景色设置等操作，并提供了获取DecorView的方法。

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DecorView的示例

public class SampleDecorView {
    private final Activity activity;

    public SampleDecorView(Activity activity) {
        this.activity = activity;
    }

    public final void fg(boolean show) {

        FrameLayout decor = getDecorView(activity);
        if (decor == null) {
            return;
        }

        if (show) {
            Drawable dr = activity.getResources().getDrawable(R.color.decor_foreground);
            //设置前景色，发现decorview占满整个屏幕
            decor.setForeground(dr);
        } else {
            decor.setForeground(null);
        }
    }

    public final void nav(boolean add) {
        FrameLayout decor = getDecorView(activity);
        if (decor == null) {
            return;
        }

        if (add) {
            Drawable dr = activity.getResources().getDrawable(R.color.decor_foreground);

            View nav = decor.getChildAt(1);
            nav.setBackground(dr);
        }
    }
    //追加或取消视图到decroView
    public final void view(boolean add) {
        FrameLayout decor = getDecorView(activity);
        if (decor == null) {
            return;
        }

        if (add) {
            Drawable dr = activity.getResources().getDrawable(R.color.decor_foreground);
            View view = new View(activity);
            view.setBackground(dr);

            FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(
                    ViewGroup.LayoutParams.MATCH_PARENT,
                    ViewGroup.LayoutParams.MATCH_PARENT
            );
            lp.leftMargin = 50;
            lp.rightMargin = 50;
            lp.topMargin = 50;
            lp.bottomMargin = 50;

            decor.addView(view, lp);
        } else {
            //最先remove可见的是nav,之后上是content和actionbar
            decor.removeViewAt(decor.getChildCount() - 1);
        }
    }

    //获取当前Activity的decorview
    private static FrameLayout getDecorView(Activity activity) {
        View view = activity.getWindow().getDecorView();
        if (view instanceof FrameLayout) {
            //decorview是一个Framelayout
            return (FrameLayout) view;
        }

        return null;
    }
}