Btukfyl

I want to disable auto-lock when my app is open. How can I do that?

For iOS, you need to override the DidFinishLaunchingWithOptions method in your Appdelegate class:

 public override bool FinishedLaunching(UIApplication uiApplication, NSDictionary launchOptions)

    {

       UIApplication.SharedApplication.IdleTimerDisabled = true;

       ....

    } 

For Android, you need to do the following things in your MainActivity for it:

you have to declare this uses-permission on AndroidManifest:

<uses-permission android:name="android.permission.WAKE_LOCK" />

Create a global field for WakeLock using static Android.OS.PowerManager;;

private WakeLock wakeLock;

And in your OnResume:

PowerManager powerManager = (PowerManager)this.GetSystemService(Context.PowerService);

WakeLock wakeLock = powerManager.NewWakeLock(WakeLockFlags.Full, "My Lock");

wakeLock.Acquire();

Just remember to release this lock when your application is paused or destroyed by doing this:

wakeLock.Release();

Usually, it's suggested to call the acquire method inside the onResume() of your activity and the release method in onPause(). This way we guarantee that our application still performs well in the case of being paused or resumed.

Goodluck revert in case of queries

Xamarin.Forms:

//show something important, do not sleep

DependencyService.Get<INativeTasks>().ExecuteTask("cannotSleep");



//can put in OnDisappearing event

DependencyService.Get<INativeTasks>().ExecuteTask("canSleep");

Native tasks helper:

 public interface INativeTasks

    {

        ...

        void ExecuteTask(string task, object param=null);

        ...

    }

Android:

Global variables and other..

public class DroidCore

{

    private static DroidCore instance;

    public static DroidCore Current

    {

        get { return instance ?? (instance = new DroidCore()); }

    }



    public static Window MainWindow { get; set; }

    ...

}

MainActivity.cs

protected override void OnCreate(Bundle bundle)

{

...        

DroidCore.Current.MainView = this.Window.DecorView;

...

}

Native helpers:

public class NativeTasks : INativeTasks

    {

    public void ExecuteTask(string task, object param = null)

    {

            switch (task)

            {



                ... //any native stuff you can imagine



            case "cannotSleep":

                DroidCore.MainWindow.AddFlags(WindowManagerFlags.KeepScreenOn);

                break;



            case "canSleep":

                DroidCore.MainWindow.ClearFlags(WindowManagerFlags.KeepScreenOn);

                break;

            }

        }

}

iOS:

Native helpers:

public class NativeTasks : INativeTasks

    {

    public void ExecuteTask(string task, object param = null)

    {

            switch (task)

            {



                ... //any native stuff you can imagine



            case "cannotSleep":

                UIApplication.SharedApplication.IdleTimerDisabled = true;

                break;



            case "canSleep":

                UIApplication.SharedApplication.IdleTimerDisabled = false;

                break;

            }

        }

}

We can achieve it by using Xamarin.Essentials plugin. Install it on solution level(While installing select include prerelease checkbox).

In your MainPage write this code

public partial class MainPage : ContentPage

{

    public MainPage()

    {

        InitializeComponent();

        ToggleScreenLock();

    }

    public void ToggleScreenLock()

    {

        if (!ScreenLock.IsActive)

            ScreenLock.RequestActive();

        else

            ScreenLock.RequestRelease();

    }

}

In Android project MainActivity add this line

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

before calling LoadApplication(new App());. For more information visit Microsoft docs.

This is working throughout the app. To install plugin refer below screenshot -