这篇文章主要介绍了popupWindow 在控件的各个方向上的显示（上、下、左、右），主要用到popupWindow 的showAtLocation(）方法：
在控件的上方：
- private void showPopUp(View v) {
- LinearLayout layout = new LinearLayout(this);
- layout.setBackgroundColor(Color.GRAY);
- TextView tv = new TextView(this);
- tv.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
- tv.setText("I‘m a pop -----------------------------!");
- tv.setTextColor(Color.WHITE);
- layout.addView(tv);
- popupWindow = new PopupWindow(layout,120,120);
- popupWindow.setFocusable(true);
- popupWindow.setOutsideTouchable(true);
- popupWindow.setBackgroundDrawable(new BitmapDrawable());
- int[] location = new int[2];
- v.getLocationOnScreen(location);
- popupWindow.showAtLocation(v, Gravity.NO_GRAVITY, location[0], location[1]-popupWindow.getHeight());
- }
在控件的其他方向上显示只需修改最后一行代码即可，如：
下方：popupWindow.showAsDropDown(v);
左边：
- popupWindow.showAtLocation(v, Gravity.NO_GRAVITY, location[0]-popupWindow.getWidth(), location[1]);
右边：
- popupWindow.showAtLocation(v, Gravity.NO_GRAVITY, location[0]+v.getWidth(), location[1]);