How to disable screensaver on Qt6.9.1 Android App

SMF-Qt

Someone suggested this solution but again the isValid() tests pass but the result fails.

    #ifdef ANDROID
    int a=0,b=0,c=0,d=0;
    QJniObject window;
    QJniObject activity = QNativeInterface::QAndroidApplication::context();
    if(activity.isValid())
    {
        a=1;
        activity.callMethod<void>("setRequestedOrientation", "(I)V", 0);
        window = activity.callObjectMethod("getWindow", "()Landroid/view/Window;");
        if (window.isValid())
        {
            b=1;
            window.callMethod<void>("addFlags", "(I)V","WindowManager.LayoutParams.FLAG_FULLSCREEN | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)");
        }
    }
    #endif

Miszkurka2000

Hi everyone. I'm new here out of curiosity.
I don't know if I can be of any help, but try asking Grok.

SMF-Qt

@SMF-Qt

Noticed this output from QtCreator while debugging my test App, could it be relevant to my problem ?

/EGL_emulation: app_time_stats: avg=500.33ms min=498.20ms max=501.49ms count=3
W/qtMainLoopThrea: type=1400 audit(0.0:9194): avc: denied { read } for name="usb" dev="tmpfs" ino=713 scontext=u:r:untrusted_app:s0:c213,c256,c512,c768 tcontext=u:object_r:usb_device:s0 tclass=dir permissive=0 app=org.qtproject.example.QtTest4D
W/qtMainLoopThrea: type=1400 audit(0.0:9195): avc: denied { read } for name="/" dev="tmpfs" ino=1 scontext=u:r:untrusted_app:s0:c213,c256,c512,c768 tcontext=u:object_r:device:s0 tclass=dir permissive=0 app=org.qtproject.example.QtTest4D
W/qtMainLoopThrea: type=1400 audit(0.0:9196): avc: denied { read } for name="devices" dev="sysfs" ino=4521 scontext=u:r:untrusted_app:s0:c213,c256,c512,c768 tcontext=u:object_r:sysfs:s0 tclass=dir permissive=0 app=org.qtproject.example.QtTest4D
D/EGL_emulation: app_time_stats: avg=500.41ms min=499.71ms max=501.11ms count=2

I expect the usb open I have in my code to fail in an Android context it is looking for a particular usb dongle in a Linux context. But this again seems to be a permissons issue at the lowest level???

SMF-Qt

@Miszkurka2000

Thanks, but Grok was unable to help.

SMF-Qt

@SMF-Qt

Ok giving up on a programatic C++ solution and going down the AndroidManifest.xml route.

The setting of the screen in Landscape works <added: android:screenOrientation="landscape"> to the AndroidManifest.xml file.

From the Android devlopers site [https://developer.android.com/develop/background-work/background-tasks/awake/screen-on] they recommend adding:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:keepScreenOn="true">
</RelativeLayout>

I have tried this code in the AndroidManifest.xml file. However this results in a build error:

AAPT: error: unexpected element <RelativeLayout> found in <manifest>

Can anyone suggest the correct syntax and/or the correct file to include it in?

SMF-Qt

@SMF-Qt

Found this piece of java code which I have built in my project. How do I get it executed as part of an activity in my AndroidManifest.xml file.

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

    public class KeepScreenOn extends Activity {
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
    
            // Keep the screen on
            getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        }
    }

SMF-Qt

@SMF-Qt

Add :

<activity android:name="KeepScreenOn">
</activity>

To AndroidManifest.xml compiles but does not work!!?

SMF-Qt

@SMF-Qt

Someone suggested adding

setContentView(R.layout.activity_main);

Above the getwindow() call in the java file.

but this errors on building with:

/work/Qt-Android/QtTest4/build/Android_Qt_6_9_1_qt_androidX86_Clang_x86_64-Debug/android-build/src/KeepScreenOn.java:9: error: package R does not exist
setContentView(R.layout.activity_main);

SMF-Qt

@SMF-Qt

Could not get anything to work apart from adding:

getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)

To the QtActivity.java file onCreate method. Which does work. Not an elegant solution but it will do until I can find a better way.

SMF-Qt

I have tried various ways to get "getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)" running however the only solution that works for me is to put it in the "onCreate" method in the QtActivity java class (Qt6.9.1) . It really needs to be conditional but I don't know enough about java to do that. Any suggestions welcome.