C# Toast通知不'；t工作

我写了一些代码，检查互联网连接的可用性，但它不起作用

我没有看到任何吐司通知。我在清单文件中写入了所有权限

这个代码有什么问题

namespace MurakamiKiev

[Activity(Label = "Murakami",MainLauncher = true,Icon = "@drawable/logo", Theme = "@android:style/Theme.Black.NoTitleBar", ScreenOrientation = ScreenOrientation.Portrait)]
public class MainActivity : Activity
{
    protected override void OnCreate (Bundle bundle)
    {
        base.OnCreate (bundle);

        // Set our view from the "main" layout resource
        SetContentView (Resource.Layout.Main);
        ImageButton next = FindViewById<ImageButton> (Resource.Id.nextButton);
        ImageButton previous = FindViewById<ImageButton> (Resource.Id.previousButton);
        ImageButton home = FindViewById<ImageButton> (Resource.Id.homeButton);
        ImageButton cart = FindViewById<ImageButton> (Resource.Id.cartButton);
        Button sushi = FindViewById<Button> (Resource.Id.sushiButton);
        Button sets = FindViewById<Button> (Resource.Id.setsbutton);
        //Button rolli = FindViewById<Button>(Resource.Id.rollibutton);
        ImageButton menu = FindViewById<ImageButton> (Resource.Id.menuButton);

        //Otslezivaem click po knopke 'next' i perehodim dalshe
        /*rolli.Click += delegate
        {
            var intent139 = new Intent(this, typeof(RolliActivity));
            StartActivity(intent139);

        };*/
        sets.Click += delegate {
            var intent121 = new Intent (this, typeof(SetsActivity));
            StartActivity (intent121);

        };
        sushi.Click += delegate {
            var intent24 = new Intent (this, typeof(SushiActivity));
            StartActivity (intent24);

        };
        next.Click += delegate {
            var intent = new Intent (this, typeof(MenuActivity));
            StartActivity (intent);
        };
        //Otlezivaem click po knopke 'Korzina' i perehodim v nee
        cart.Click += delegate {
            var intent2 = new Intent (this, typeof(CartActivity));
            StartActivity (intent2);
        };
        menu.Click += delegate {
            var intent39 = new Intent (this, typeof(MenuTopActivity));
            StartActivity (intent39);

        };
    }

    public void CheckNetwork()
    {
        var connectivityManager = (ConnectivityManager)GetSystemService(ConnectivityService);

        var activeConnection = connectivityManager.ActiveNetworkInfo;

        if ((activeConnection != null) && activeConnection.IsConnected)
        {
            Toast.MakeText (this, "OK", ToastLength.Short).Show ();
        } 

        else 
        {
            Toast.MakeText (this, "Connect to the wi-fi", ToastLength.Short).Show ();
        }       
    }
}

namespace MurakamiKiev
[Activity（Label=“Murakami”，MainLauncher=true，Icon=“@drawable/logo”，Theme=“@android:style/Theme.Black.NoTitleBar”，ScreenOrientation=ScreenOrientation.肖像）]
公共课活动：活动
{
创建时受保护的覆盖无效（捆绑包）
{
base.OnCreate（bundle）；
//从“主”布局资源设置视图
SetContentView（Resource.Layout.Main）；
ImageButton next=findviewbyd（Resource.Id.nextButton）；
ImageButton previous=FindViewById（Resource.Id.previousButton）；
ImageButton home=FindViewById（Resource.Id.homeButton）；
ImageButton购物车=FindViewById（Resource.Id.cartButton）；
Button sushi=FindViewById（Resource.Id.sushiButton）；
按钮集=FindViewById（Resource.Id.setsbutton）；
//按钮rolli=findviewbyd（Resource.Id.rollibutton）；
ImageButton菜单=FindViewById（Resource.Id.menuButton）；
//Otslezivaem单击“下一步”我将继续
/*rolli.Click+=委托
{
var intent139=新的意图（这是，typeof（RolliActivity））；
起始触觉（意图139）；
};*/
设置。单击+=委派{
var intent121=新意图（此，类型为（设置活动））；
星触觉（intent121）；
};
sushi.Click+=委托{
var intent24=新意图（此，类型为（活动））；
起始触觉（意图24）；
};
下一步。单击+=委派{
var intent=新的意图（此，类型为（MenuActivity））；
星触觉（意向）；
};
//Otlezivaem单击“Korzina”一词和“perehodim v nee”一词
购物车。单击+=委托{
var intent2=新的意图（此，类型为（CartActivity））；
星触觉（intent2）；
};
菜单。单击+=委派{
var intent39=新的意图（此，类型为（MenuTopActivity））；
起始触觉（意图39）；
};
}
公共网络
{
var connectivityManager=（connectivityManager）GetSystemService（ConnectivityService）；
var activeConnection=connectivityManager.ActiveNetworkInfo；
if（（activeConnection！=null）&&activeConnection.IsConnected）
{
Toast.MakeText（这个“OK”，ToastLength.Short）.Show（）；
} 
其他的
{
Toast.MakeText（这是“连接到wi-fi”，ToastLength.Short）.Show（）；
}       
}
}

这个代码有什么问题

namespace MurakamiKiev

[Activity(Label = "Murakami",MainLauncher = true,Icon = "@drawable/logo", Theme = "@android:style/Theme.Black.NoTitleBar", ScreenOrientation = ScreenOrientation.Portrait)]
public class MainActivity : Activity
{
    protected override void OnCreate (Bundle bundle)
    {
        base.OnCreate (bundle);

        // Set our view from the "main" layout resource
        SetContentView (Resource.Layout.Main);
        ImageButton next = FindViewById<ImageButton> (Resource.Id.nextButton);
        ImageButton previous = FindViewById<ImageButton> (Resource.Id.previousButton);
        ImageButton home = FindViewById<ImageButton> (Resource.Id.homeButton);
        ImageButton cart = FindViewById<ImageButton> (Resource.Id.cartButton);
        Button sushi = FindViewById<Button> (Resource.Id.sushiButton);
        Button sets = FindViewById<Button> (Resource.Id.setsbutton);
        //Button rolli = FindViewById<Button>(Resource.Id.rollibutton);
        ImageButton menu = FindViewById<ImageButton> (Resource.Id.menuButton);

        //Otslezivaem click po knopke 'next' i perehodim dalshe
        /*rolli.Click += delegate
        {
            var intent139 = new Intent(this, typeof(RolliActivity));
            StartActivity(intent139);

        };*/
        sets.Click += delegate {
            var intent121 = new Intent (this, typeof(SetsActivity));
            StartActivity (intent121);

        };
        sushi.Click += delegate {
            var intent24 = new Intent (this, typeof(SushiActivity));
            StartActivity (intent24);

        };
        next.Click += delegate {
            var intent = new Intent (this, typeof(MenuActivity));
            StartActivity (intent);
        };
        //Otlezivaem click po knopke 'Korzina' i perehodim v nee
        cart.Click += delegate {
            var intent2 = new Intent (this, typeof(CartActivity));
            StartActivity (intent2);
        };
        menu.Click += delegate {
            var intent39 = new Intent (this, typeof(MenuTopActivity));
            StartActivity (intent39);

        };
    }

    public void CheckNetwork()
    {
        var connectivityManager = (ConnectivityManager)GetSystemService(ConnectivityService);

        var activeConnection = connectivityManager.ActiveNetworkInfo;

        if ((activeConnection != null) && activeConnection.IsConnected)
        {
            Toast.MakeText (this, "OK", ToastLength.Short).Show ();
        } 

        else 
        {
            Toast.MakeText (this, "Connect to the wi-fi", ToastLength.Short).Show ();
        }       
    }
}

您没有在任何地方调用您的方法，因此它永远不会显示

Toast

，因为该方法是从不调用的

如何解决

例如，如果要在启动

活动时检查连接，只需按如下方式添加此方法：

 protected override void OnCreate (Bundle bundle)
{
    base.OnCreate (bundle);

    // Set our view from the "main" layout resource
    SetContentView (Resource.Layout.Main);
    ImageButton next = FindViewById<ImageButton> (Resource.Id.nextButton);
    ImageButton previous = FindViewById<ImageButton> (Resource.Id.previousButton);
    ImageButton home = FindViewById<ImageButton> (Resource.Id.homeButton);
    ImageButton cart = FindViewById<ImageButton> (Resource.Id.cartButton);
    Button sushi = FindViewById<Button> (Resource.Id.sushiButton);
    Button sets = FindViewById<Button> (Resource.Id.setsbutton);
    //Button rolli = FindViewById<Button>(Resource.Id.rollibutton);
    ImageButton menu = FindViewById<ImageButton> (Resource.Id.menuButton);


    CheckNetwork(); //Here you'll ask if you have connection or not and Toast will show

protectedoverride void OnCreate（捆绑包）
{
base.OnCreate（bundle）；
//从“主”布局资源设置视图
SetContentView（Resource.Layout.Main）；
ImageButton next=findviewbyd（Resource.Id.nextButton）；
ImageButton previous=FindViewById（Resource.Id.previousButton）；
ImageButton home=FindViewById（Resource.Id.homeButton）；
ImageButton购物车=FindViewById（Resource.Id.cartButton）；
Button sushi=FindViewById（Resource.Id.sushiButton）；
按钮集=FindViewById（Resource.Id.setsbutton）；
//按钮rolli=findviewbyd（Resource.Id.rollibutton）；
ImageButton菜单=FindViewById（Resource.Id.menuButton）；
CheckNetwork（）；//在这里，您将询问是否有连接，Toast将显示
在Main Activity@arunth中调用checkNetwork方法在上述代码中没有调用checkNetwork的迹象。public void checkNetwork（）{var connectivityManager=（connectivityManager）GetSystemService（ConnectivityService）；var activeConnection=connectivityManager.ActiveNetworkInfo；如果(（activeConnection！=null）&&activeConnection.IsConnected）{Toast.MakeText（这个“OK”，ToastLength.Short.Show（）；}其他{Toast.MakeText（这个“连接到wi-fi”，ToastLength.Short.Show（）；}}}@aru您没有调用CheckNetwork（）；在某些情况下，在oncreate方法上没有问题，这是愉快的编码；）始终使用断点调试应用程序和您认为无法正常工作的每个函数，始终从最后一个不期望的结果开始到第一个