如何居中弹出窗口?

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?

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);

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