Xamarin~Android篇~监听返回键，单击返回某个webView，双击退出

https://www.cnblogs.com/lori/p/5088627.html

 DateTime? lastBackKeyDownTime;

        public override bool OnKeyDown(Keycode keyCode, KeyEvent e)

        {

            if (keyCode == Keycode.Back && e.Action == KeyEventActions.Down)

            {

                if (!lastBackKeyDownTime.HasValue || DateTime.Now - lastBackKeyDownTime.Value > new TimeSpan(0, 0, 2))

                {

                    Toast.MakeText(this.ApplicationContext, "再按一次退出程序", ToastLength.Short).Show();

                    lastBackKeyDownTime = DateTime.Now;

                    loadUrl("/Task/CurrentTaskList");

                }

                else

                {

                    Finish();

                }

                return true;

            }

            return base.OnKeyDown(keyCode, e);

        }

巴特西

Xamarin~Android篇~监听返回键，单击返回某个webView，双击退出

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