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How can I know that my app gets in background.

    Question

  • Hello,

    Is there any way to know when user move away from my app. I need to stop some services when it navigate away from it.

    Thanks in advance.

    Monday, July 21, 2014 1:32 PM

Answers

  • Hi Zee,

    place it in the OnLaunched-Method in the App.xaml before the Window.Current.Activate()-method is called:

      public App()
            {
                this.InitializeComponent();
                this.Suspending += OnSuspending;
    
              
    
            }
    
            /// <summary>
            /// Invoked when the application is launched normally by the end user.  Other entry points
            /// will be used such as when the application is launched to open a specific file.
            /// </summary>
            /// <param name="e">Details about the launch request and process.</param>
            protected override void OnLaunched(LaunchActivatedEventArgs e)
            {
    
    #if DEBUG
                if (System.Diagnostics.Debugger.IsAttached)
                {
                    this.DebugSettings.EnableFrameRateCounter = true;
                }
    #endif
    
                Frame rootFrame = Window.Current.Content as Frame;
    
                // Do not repeat app initialization when the Window already has content,
                // just ensure that the window is active
                if (rootFrame == null)
                {
                    // Create a Frame to act as the navigation context and navigate to the first page
                    rootFrame = new Frame();
                    // Set the default language
                    rootFrame.Language = Windows.Globalization.ApplicationLanguages.Languages[0];
    
                    rootFrame.NavigationFailed += OnNavigationFailed;
    
                    if (e.PreviousExecutionState == ApplicationExecutionState.Terminated)
                    {
                        //TODO: Load state from previously suspended application
                    }
    
                    // Place the frame in the current Window
                    Window.Current.Content = rootFrame;
                }
    
                if (rootFrame.Content == null)
                {
                    // When the navigation stack isn't restored navigate to the first page,
                    // configuring the new page by passing required information as a navigation
                    // parameter
                    rootFrame.Navigate(typeof(MainPage), e.Arguments);
                }
    
                Window.Current.VisibilityChanged += (s, args) =>
                {
                    if (!args.Visible)
                    {
                        // Application went to background
                    }
                    else
                    {
                        // Application is FullScreen again
                    }
                };     
    
                // Ensure the current window is active
                Window.Current.Activate();
            }


    Thomas Claudius Huber

    "If you can't make your app run faster, make it at least look & feel extremly fast"

    My latest app: The "Womanizer" :-)
    twitter: @thomasclaudiush
    homepage: www.thomasclaudiushuber.com
    author of: ultimate Windows Store Apps handbook | ultimate WPF handbook | ultimate Silverlight handbook

    • Marked as answer by zee_patel Wednesday, July 23, 2014 5:13 AM
    Tuesday, July 22, 2014 8:44 PM

All replies

  • Hi Zee,

    you can use the VisibilityChanged-Event for that.

    Find more here: http://msdn.microsoft.com/en-us/library/windows/apps/hh464925.aspx


    Thomas Claudius Huber

    "If you can't make your app run faster, make it at least look & feel extremly fast"

    My latest app: The "Womanizer" :-)
    twitter: @thomasclaudiush
    homepage: www.thomasclaudiushuber.com
    author of: ultimate Windows Store Apps handbook | ultimate WPF handbook | ultimate Silverlight handbook

    Monday, July 21, 2014 2:58 PM
  • Hi Thomas

    Thanks for your reply,

    I already tried that code in App.xaml.cs but it is throwing ComException when app gets loaded. Here is the code.

    public App()
    {
       this.InitializeComponent();
       this.Suspending += OnSuspending;  
    
    
         Window.Current.VisibilityChanged += (s, e) =>
         {
            if (!e.Visible)
           {
              // Application went to background
           }
           else
           {
              // Application is FullScreen again
           }
         };     
    }


    • Edited by zee_patel Tuesday, July 22, 2014 7:39 AM
    Tuesday, July 22, 2014 7:39 AM
  • Hi Zee,

    place it in the OnLaunched-Method in the App.xaml before the Window.Current.Activate()-method is called:

      public App()
            {
                this.InitializeComponent();
                this.Suspending += OnSuspending;
    
              
    
            }
    
            /// <summary>
            /// Invoked when the application is launched normally by the end user.  Other entry points
            /// will be used such as when the application is launched to open a specific file.
            /// </summary>
            /// <param name="e">Details about the launch request and process.</param>
            protected override void OnLaunched(LaunchActivatedEventArgs e)
            {
    
    #if DEBUG
                if (System.Diagnostics.Debugger.IsAttached)
                {
                    this.DebugSettings.EnableFrameRateCounter = true;
                }
    #endif
    
                Frame rootFrame = Window.Current.Content as Frame;
    
                // Do not repeat app initialization when the Window already has content,
                // just ensure that the window is active
                if (rootFrame == null)
                {
                    // Create a Frame to act as the navigation context and navigate to the first page
                    rootFrame = new Frame();
                    // Set the default language
                    rootFrame.Language = Windows.Globalization.ApplicationLanguages.Languages[0];
    
                    rootFrame.NavigationFailed += OnNavigationFailed;
    
                    if (e.PreviousExecutionState == ApplicationExecutionState.Terminated)
                    {
                        //TODO: Load state from previously suspended application
                    }
    
                    // Place the frame in the current Window
                    Window.Current.Content = rootFrame;
                }
    
                if (rootFrame.Content == null)
                {
                    // When the navigation stack isn't restored navigate to the first page,
                    // configuring the new page by passing required information as a navigation
                    // parameter
                    rootFrame.Navigate(typeof(MainPage), e.Arguments);
                }
    
                Window.Current.VisibilityChanged += (s, args) =>
                {
                    if (!args.Visible)
                    {
                        // Application went to background
                    }
                    else
                    {
                        // Application is FullScreen again
                    }
                };     
    
                // Ensure the current window is active
                Window.Current.Activate();
            }


    Thomas Claudius Huber

    "If you can't make your app run faster, make it at least look & feel extremly fast"

    My latest app: The "Womanizer" :-)
    twitter: @thomasclaudiush
    homepage: www.thomasclaudiushuber.com
    author of: ultimate Windows Store Apps handbook | ultimate WPF handbook | ultimate Silverlight handbook

    • Marked as answer by zee_patel Wednesday, July 23, 2014 5:13 AM
    Tuesday, July 22, 2014 8:44 PM