如何仅在应用程序处于睡眠模式时从便携式项目调用pushNotification

Question

我正在使用CrossPlateForm技术使用xamarine创建Android和IOS应用程序，我想在应用程序处于睡眠模式时发送推送通知， this是我的方法

public void pushNotifications(int count) 
    { 
     Notification.Builder builder = new Notification.Builder(this) 
      .SetContentTitle("new Messages") 
      .SetContentText("Hello World! This is my first notification!") 
      .SetSmallIcon(Resource.Drawable.icon); 

     // Instantiate the Inbox style: 
     Notification.InboxStyle inboxStyle = new Notification.InboxStyle(); 

     // Set the title and text of the notification: 
     builder.SetContentTitle(count+" new messages"); 
     //builder.SetContentText("chimchim@xamarin.com"); 


     // Plug this style into the builder: 
     builder.SetStyle(inboxStyle); 

     // Build the notification: 
     Notification notification = builder.Build(); 

     // Get the notification manager: 
     NotificationManager notificationManager = 
      GetSystemService(Context.NotificationService) as NotificationManager; 

     // Publish the notification: 
     const int notificationId = 0; 
     notificationManager.Notify(notificationId, notification); 

    } 

计数将来自我在便携式项目写道，当我试图写在便携式项目Notification.Builder我无法访问Notification命名空间pushNotification方法的服务。我想在portable项目中触发一个方法，只要应用程序使用睡眠模式并使用pushNotification显示计数，或者是他们的任何替代方式来执行此操作？

Answer 1

你应该尝试调用OnSleep函数内部上App.cs方法：

public class App : Application 
{ 
    { 
     ... 
    } 

    protected override void OnSleep() 
    { 
     // Your method here 
    }