popwindow在View的上，下，左，右 显示

 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]);