在android7.0的版本測出popupwindow使用showAsDropDown方法之後,並不能顯示在指定view的下方,而是全屏顯示,只要重寫showAsDropDown判斷一下版本就好了.建議不要使用popupwindow了,使用DialogFragment代替

public class SingleFlowPopuwindow extends PopupWindow {

    public SingleFlowPopuwindow (View contentView, int width, int height){
        super(contentView,width,height);
    }

    @Override
 

    public void showAsDropDown(View anchor) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            Rect visibleFrame = new Rect();
            anchor.getGlobalVisibleRect(visibleFrame);
            int height = anchor.getResources().getDisplayMetrics().heightPixels - visibleFrame.bottom;
            setHeight(height);
        }
        super
 
.showAsDropDown(anchor);
    }

    @Override
    public void showAsDropDown(View anchor, int xoff, int yoff) {
        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            Rect visibleFrame = new Rect();
            anchor.getGlobalVisibleRect(visibleFrame);
            int height = anchor.getResources().getDisplayMetrics().heightPixels - visibleFrame.bottom;
            setHeight(height);
        }
        super
 
.showAsDropDown(anchor, xoff, yoff);
    }
}