PopupWindow 简单实用（居中显示）

final View inflate = View.inflate(this, R.layout.layout, null);

p = new PopupWindow(inflate,100,100);
p.setTouchable(true);
p.setFocusable(true);
p.setBackgroundDrawable(new ColorDrawable(getResources().getColor(R.color.cc)));
p.showAtLocation(inflate, Gravity.CENTER,0,0);
p.showAsDropDown(inflate,100,100);