AlertDialog 宽度充满整个屏幕

//设置对话框铺满屏幕
Window win = dialog.getWindow();
win.getDecorView().setPadding(0, 0, 0, 0);
WindowManager.LayoutParams lp = win.getAttributes();
lp.width = WindowManager.LayoutParams.MATCH_PARENT;
lp.height = WindowManager.LayoutParams.WRAP_CONTENT;
win.setAttributes(lp);