实现将android的AlertDialog弹框底部两个按钮靠右显示变为居中显示

一开始AlertDialog弹框按钮是这样的：（忽略我随便复制粘贴的弹框内容以及还未美化的界面哈）

然后，想把按钮居中显示：

方法如下：

 public void setDialogStyle(){
        Button btnPositive = dialog.getButton(AlertDialog.BUTTON_POSITIVE);
        Button btnNegative = dialog.getButton(AlertDialog.BUTTON_NEGATIVE);

        LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) btnPositive.getLayoutParams();
        layoutParams.weight = 10;
        btnPositive.setLayoutParams(layoutParams);
        btnNegative.setLayoutParams(layoutParams);
    }

在这发现的：https://stackoverflow.com/questions/30743038/align-alertdialog-buttons-to-center