1.问题描述

AlertDialog在同事9.0.0的手机上不居中显示，处于屏幕偏右。

2.解决方案

添加以下代码：
AlertDialog dialog = builder.create();

dialog.show();

Window dialogWindow = dialog.getWindow();

WindowManager m =activity.getWindowManager();

Display d = m.getDefaultDisplay();

WindowManager.LayoutParams p = dialogWindow.getAttributes();

p.width = (int) (d.getWidth() *0.95);

p.gravity = Gravity.CENTER;

dialogWindow.setAttributes(p);