Please have a look
https://github.com/denisgottardello/QtAndroidServiceExternalLib
where you can find how to start and stop a service

@jsulm Hmm, it seems it was an Android/Samsung issue...

I have rebooted the device, and now calling startService works fine!

Please note https://bugreports.qt.io/browse/QTBUG-76411, as Android 8 and later have quite a few new restrictions to background services.

@Marcinecki
Hi,

Did you managed to use QAndroidServiceConnection?
I also created ServiceConnection class inherits from QAndroidServiceConnection and implements onServiceConnected but i'm getting the following error:
No implementation found for void org.qtproject.qt.android.extras.QtNative.onServiceConnected(long, java.lang.String, android.os.IBinder) (tried Java_org_qtproject_qt_android_extras_QtNative_onServiceConnected and Java_org_qtproject_qt_android_extras_QtNative_onServiceConnected__JLjava_lang_String_2Landroid_os_IBinder_2)

The "bindService" method returned success.
I'm using Qt version 6.5.1 and my service is java based and my main activity is Qt c++ code.
I'm trying to bind between both of them so my service could use my main activity API.

Hope you can help me with that, I have tried all without success.

Thanks!

Unfortunately it didn't work. I still get the same value. Any other suggestion?

It was me doing stupid things on JNI_Onload for application, and being called also for service; then crash.

Hi @tansgumus ,

Apple is very conservative in allowing developers long term background threats/events.

Taken from the Apple docu:

Implementing Long-Running Background Tasks For tasks that require more execution time to implement, you must request specific permissions to run them in the background without their being suspended. In iOS, only specific app types are allowed to run in the background: Apps that play audible content to the user while in the background, such as a music player app Apps that keep users informed of their location at all times, such as a navigation app Apps that support Voice over Internet Protocol (VoIP) Newsstand apps that need to download and process new content Apps that receive regular update from external accessories Apps that implement these services must declare the services they support and use system frameworks to implement the relevant aspects of those services. Declaring the services lets the system know which services you use, but in some cases it is the system frameworks that actually prevent your application from being suspended.

That said, a navigation app should fall in this category. But as it is, you're bound to do it in OBjective-C but its relative easy to include ObjectiveC code in Qt.

@kshegunov Thank you for your suggestion I will try to follow it.

@kshegunov I see, now i understand. Thank you for your help and for your patience.

There was no "src" directory at that location. So I created one and moved the java files there. I did not mention them in the .pro file. The files have not shown up in the project view within QtCreator. I executed qmake, rebuilt and ran the app. Same result (RuntimeException). Can I trace or debug somehow, what's going on?

After adding them to the DISTFILES variable, they got copied to the build directory and ignored afterwards. The Qt deploy tool obviously does not do anything with them. Shouldn't they be compiled into the dalvik executable?

OK, I found them as ".class" files in <build-folder>/android-build/build/intermediates/classes/debug/... among other java files like "BuildConfig.class". So maybe, some identifier is wrong or something.

@Mark81 ok, I found a way:

QDBusInterface *iface = new QDBusInterface("your.service", "/your/path", "org.freedesktop.DBus.Introspectable", QDBusConnection::systemBus(), this); qDebug() << iface->call("Introspect").arguments();

@lolopolosko
Oh, I was just about to suggest you buffer all the received data. But as you've solved your problem then my suggestion is moot. I'm glad it works now.

Kind regards.

@eiriham Were you able to get this question answered? My application is using QAndroidService and I would like to run code from Qt/c++? Thanks

Konstantin!
I am not very strong in English.
I would like to talk about your library.
Can we chat somewhere else?
Facebook? or somewhere else?

@Max13
Do let me know whether it's convenient to use, and of course suggestions are welcome. (bug reports please post on the issue tracker).

Solved using version 5.4.2..
Should to exist a bug with missing libraries for Qt 5.5 version

@vlada Android Visualizer class. But it probably has bug in API level 26.