如何使AlertDialog阻止代码？

AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("标题");
builder.setMessage("消息内容");
builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        // 点击确定按钮后的操作
    }
});
builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        // 点击取消按钮后的操作
    }
});
AlertDialog dialog = builder.create();

dialog.show();

dialog.setCancelable(false);