参考： http://blog.csdn.net/ithe1001/article/details/56281750
Android7.0 以上popupwindow showAsDropDown在屏幕上方弹出解决方法，通过版本控制解决，
public static void showAsDropDown(PopupWindow pw, View anchor, int xoff, int yoff) {
if (Build.VERSION.SDK_INT >= 24) {
Rect visibleFrame = new Rect();
anchor.getGlobalVisibleRect(visibleFrame);
int height = anchor.getResources().getDisplayMetrics().heightPixels - visibleFrame.bottom;
pw.setHeight(height);
pw.showAsDropDown(anchor, xoff, yoff);
} else {
pw.showAsDropDown(anchor, xoff, yoff);
}
}
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