如何使用Xamarin.Android中的倒计时类设置、重置计时器

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我为另一个项目制作了一个简单的倒计时应用程序，我尽力运行这个简单的计时器来启动、暂停和重置timer.My第一个问题是，由于MainActivity不能继承多个类，所以我必须创建一个新的类，这样我才能继承抽象类倒计时，其次，我不完全知道我是否能够从抽象类中调用倒计时构造函数，因为我不能初始化一个抽象类，只能在子类构造函数中调用它的形式。而且，我不明白我的UI.I'm在这个问题上完全迷失了，有人能帮我吗。我也在github上发布了代码

GitHub:https://github.com/owais19m/TimerApp_Test

Thanks ,

Blockquote

using Android.App;

using Android.OS;

using Android.Support.V7.App;

using Android.Runtime;

using Android.Widget;

using Android.Content;

using Android.Telephony;

using Android.Provider;

using Android.Util;

using Java.Lang;

using System.Text.RegularExpressions;

using Xamarin.Essentials;

using System;

using Android;

using Android.Support.V4.Content;

using Android.Content.PM;

namespace TimerApp_Test

{

[Activity(Label = "@string/app_name", Theme = "@style/AppTheme", MainLauncher = true)]

public class MainActivity : AppCompatActivity

{

private static System.Boolean mTimerRunning;

protected override void OnCreate(Bundle savedInstanceState)

{

base.OnCreate(savedInstanceState);

Xamarin.Essentials.Platform.Init(this, savedInstanceState);

// Set our view from the "main" layout resource

SetContentView(Resource.Layout.activity_main);

//------------ Views -------------

Button ResetBtn = FindViewById<Button>(Resource.Id.ResetButton);

Button StartBtn = FindViewById<Button>(Resource.Id.StartButton);

TextView TimerText = FindViewById<TextView>(Resource.Id.CountdownText);

//--------------------------------

StartBtn.Click += (s, e) =>

{

if (mTimerRunning)

{

pauseTimer();

}

else

{

startTimer();

}

};

ResetBtn.Click += (s, e) =>

{

resetTimer();

};

}

public void startTimer()

{

CountDown1 Coutdwn = new CountDown1(6000,1000);

Coutdwn.OnTick(1000);

Coutdwn.Start();

mTimerRunning = true;

}

public void resetTimer()

{

}

public void pauseTimer()

{

}

public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)

{

Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);

base.OnRequestPermissionsResult(requestCode, permissions, grantResults);

}

public class CountDown1 : CountDownTimer

{

public static long Start_Time_Milliseconds = 600000;

public static CountDownTimer mcountDownTimer;

public static long mTimeLeftInMillis = Start_Time_Milliseconds;

public CountDown1(long mTimeLeftInMilli, long countDownInterva) : base(mTimeLeftInMilli,countDownInterva)

{

}

public override void OnFinish() { }

public override void OnTick(long millisUntilFinished)

{

mTimeLeftInMillis = millisUntilFinished;

updateCountDownText();

}

public string updateCountDownText()

{

int minutes = (int)mTimeLeftInMillis / 1000 / 60;

int seconds = (int)mTimeLeftInMillis / 1000 % 60;

string timeLeftFormatted = string.Format("%02d:%02d", minutes, seconds);

return timeLeftFormatted;

}

public void Cancellation()

{

mcountDownTimer.Cancel();

}

Blockquote

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