Android 给主视图增加蒙层(转载)

做完一个app之后发现给视图增加全屏的蒙层是很常用的一个功能，之前是在BaseActiviy中写死一个全屏的view，在子类中控制其显示，这样会大大增加基类中的代码量，于是查询在当前类中通过代码来增加蒙层的方法，如下：

public void showGuideView() {
 
    View view = getWindow().getDecorView().findViewById(R.id.activity_main);
    if (view == null) return;
 
    ViewParent viewParent = view.getParent();
    if (viewParent instanceof FrameLayout) {
        final FrameLayout frameParent = (FrameLayout) viewParent;//整个父布局
 
        final LinearLayout linearLayout = new LinearLayout(this);//新建一个LinearLayout
        linearLayout.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
        linearLayout.setOrientation(LinearLayout.VERTICAL);
        linearLayout.setBackgroundColor(#88000000);//背景设置灰色透明
        linearLayout.setGravity(Gravity.CENTER_HORIZONTAL);
        linearLayout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
              frameParent.removeView(linearLayout);
            }
        });
 
        Rect rect = new Rect();
        Point point = new Point();
        nearby.getGlobalVisibleRect(rect, point);//获得nearby这个控件的宽高以及XY坐标 nearby这个控件对应就是需要高亮显示的地方
 
        ImageView topGuideview = new ImageView(this);
        topGuideview.setLayoutParams(new ViewGroup.LayoutParams(rect.width(), rect.height()));           topGuideview.setBackgroundResource(R.drawable.iv_topguide);
 
  Rect rt = new Rect();
getWindow().getDecorView().getWindowVisibleDisplayFrame(rt);
        topGuideview.setY(point.y - rt.top);//rt.top是手机状态栏的高度
        ImageView bottomGuideview = new ImageView(this);
        bottomGuideview.setLayoutParams(new ViewGroup.LayoutParams(WRAP_CONTENT, WRAP_CONTENT));
        bottomGuideview.setBackgroundResource(R.drawable.iv_bottomguide);
        bottomGuideview.setY(point.y + topGuideview.getHeight());
 
        linearLayout.addView(topGuideview);
        linearLayout.addView(bottomGuideview);
        frameParent.addView(linearLayout);
    }
}

参考文章
https://blog.csdn.net/u013299273/article/details/54137847
https://blog.csdn.net/qq_31743309/article/details/77934273
https://blog.csdn.net/Dreamj1991/article/details/80267464