android popupwindow相关备忘录

1.让popupWidow在指定控件或位置上方显示：

int[] location = new int[2];
view.getLocationOnScreen(mLocation);
mPopupWindow.showAtLocation(mGradeView, Gravity.NO_GRAVITY, mLocation[0], mLocation[1]-mPopupWindow.getHeight());

2.点击popupWindow以外的区域，popupWindow消失：

 mPopupWindow.setBackgroundDrawable(new BitmapDrawable());
 mPopupWindow.setOutsideTouchable(true);