Android PopupWindow实现遮罩层效果

此篇博客实现的功能是：点击界面中的图片，跳出一个PopupWindow，PopupWindow中含有相应的文字和图标，并且在显示PopupWindow的时候，背景为半透明。

看图描述：点击加号，跳出PopupWindow，其中包含三个图片，点击叉号PopupWindow消失；当PopupWindow显示的时候，背景为半透明

显示PopupWindow的代码

private void showPopupWindow() {
 View view = (LinearLayout) getLayoutInflater().inflate(R.layout.popup_window_layout, null);
 ImageView ivP = (ImageView) view.findViewById(R.id.ivP);
 ImageView ivX = (ImageView) view.findViewById(R.id.ivX);
 ImageView ivClose = (ImageView) view.findViewById(R.id.ivClose);
 LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,
   LayoutParams.WRAP_CONTENT);
 ivP.setLayoutParams(params);
 ivX.setLayoutParams(params);
 ivClose.setLayoutParams(params);
 ivClose.setOnClickListener(this);
 popupWindow = new PopupWindow(WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.WRAP_CONTENT);
 popupWindow.setContentView(view);
 popupWindow.setFocusable(true);
 popupWindow.setTouchable(true);
 popupWindow.setOutsideTouchable(false);
 popupWindow.showAsDropDown(ivAdd, 0, 0);
 backgroundAlpha(0.4f);
}

private void backgroundAlpha(float f) {
 WindowManager.LayoutParams lp =getWindow().getAttributes();
 lp.alpha = f;
 getWindow().setAttributes(lp);
}

backgroundAlpha()方法用于设置PopupWindow显示后的背景半透明，参数 f 的范围是0.0~1.0，数值越大透明度越高。

源码下载

来源：https://blog.csdn.net/carter_yu/article/details/50687982?utm_source=blogxgwz1