android move a view

 float wechatIconX = ivWechat.getX();
        int weChatIconWidth = ivWechat.getWidth();
        float wechatIconCenterX = wechatIconX + weChatIconWidth / 2;
        float popupWidthPX = getResources().getDimension(R.dimen.wechatPopUp_width);
        ivWechatPopUp.setX(wechatIconCenterX - popupWidthPX / 2);