让popwindow在view 上方显示的

上方显示

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());
	}

下方

popupWindow.showAsDropDown(v);

左方

popupWindow.showAtLocation(v, Gravity.NO_GRAVITY, location[0]-popupWindow.getWidth(), location[1]);

右方

popupWindow.showAtLocation(v, Gravity.NO_GRAVITY, location[0]+v.getWidth(), location[1]);