Android: How to prevent а device from going to sleep?

Recongalina · March 27, 2026, 4:35pm

Ok, I made it just a screen hold like for a video player. It doesn’t even require permission.

Here is the service I wrote:

android_services/keep_screen/app/src/main/java/io/castleengine/ServiceKeepScreen.java

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/* -*- tab-width: 4 -*- */

/*
  ----------------------------------------------------------------------------
*/

package io.castleengine;

import android.app.Activity;
import android.view.WindowManager;

/**
 * For this service no need special permission on Android.
 */
public class ServiceKeepScreen extends ServiceAbstract
{
    public ServiceKeepScreen(MainActivity activity)
    {
        super(activity);
    }

This file has been truncated. show original

Here is Pascale usage:

github.com/SerufuYua/training_timer_2

code/seqkeepscreenservice.pas

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          procedure KeepScreen(AEnable: Boolean);
          begin
            {$ifdef DEBUG}
            if AEnable then
              WritelnLog('keep-screen is ON')
            else
              WritelnLog('keep-screen is OFF');
            {$endif}
          
            {$if defined(ANDROID)}
            if AEnable then
              Messaging.Send(['keep-screen', 'ON'])
            else
              Messaging.Send(['keep-screen', 'OFF']);
            {$endif}
          end;
          
          end.

According to this documentation:

This functionality is already enough to make my app fully usable. And I can make the release.

PS: For Windows version added same functionality.

PS2: Background counting isn’t implemented yet, but I thinking on it.