锁屏、切到后台 程序强制暂停时使用

  private long leaveTime;

    private void OnApplicationFocus(bool focus)

    {

        if (focus==false)

        {

            // 暂时APP切换到后台

            this.leaveTime = GetTimeStamp;

        }

        else

        {

            // 再次进入的时间

            long now = GetTimeStamp;

            if (this.leaveTime>0&&now -this.leaveTime>3)

            {

                //退出

            }

        }

    }

    private void OnApplicationPause(bool pause)

    {

        if (pause)

        {

            // app 暂停

            this.leaveTime = GetTimeStamp;

        }

        else

        {

            long now = GetTimeStamp;

            if (this.leaveTime > 0 && now - this.leaveTime > 3)

            {

                //退出

            }

        }

    }

转换自 1970.1.1至今的时间

using System;

static readonly DateTime DataTime1970 = new DateTime(1970, 1, 1);

  // 返回时间戳（秒）

    public static long GetTimeStamp

    {

        get

        {

            TimeSpan ts = DateTime.UtcNow - DataTime1970;

            return Convert.ToInt64(ts.TotalSeconds);

        }

    }

    /// 返回时间戳毫秒

    public static long GetTimeStapMs

    {

        get

        {

            TimeSpan ts = DateTime.UtcNow - DataTime1970;

            return Convert.ToInt64(ts.TotalMilliseconds);

        }

    }