如何居中弹出窗口?

本文介绍了如何居中弹出窗口?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

I created an Activity in which i add a button that throws a popup when is clicked. Here is the code of showPopup() method:

private void showPopup() { LayoutInflater inflater = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE); View layout = inflater.inflate(R.layout.popup_layout, (ViewGroup) findViewById(R.id.popup_element), false); final PopupWindow pwindo = new PopupWindow(layout, LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT, true); Button btnAgree = (Button) layout.findViewById(R.id.ok); btnAgree.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { pwindo.dismiss(); } }); pwindo.showAtLocation(layout, Gravity.CENTER, 0, 0); } }

I would center it both vertically and orizzontally. I tried several ways that i see here on SO but none worked. Why i always get the popup window at the top of the screen?

解决方案

you can use setHorizontalOffset:

ListPopupWindow popupWindow = new ListPopupWindow(this); // Position popupWindow.setAnchorView(btn); popupWindow.setPromptPosition (ListPopupWindow.POSITION_PROMPT_ABOVE); popupWindow.setHorizontalOffset((btn.layoutParams.width - popupWindow.getWidth())/2);