Qt Android service in an pure external c++ library
In order to have a working Qt Android service there are several steps to follow (Qt Creator 6.0.2 on Debian 11):
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The app and the service projects (.pro files) must be in the same folder. During the build, the .so files will be generated in the same folder and, when the deploy tool creates the apk it will copy all them.
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In order to manage the gui project and the service project at the same time, a project called "QtAndroidCommons.pro" was been created.
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The service project called "QtAndroidLib01" must use "QAndroidService app(argc, argv);" and have these options:
QT += androidextras
TEMPLATE = lib
TARGET = QtAndroidLib01
CONFIG += c++11 dll-
The app with the service embedded must contains the class "QtAndroidService.java"
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The "QtAndroidService.java" must contains the onCreate() and onDestroy() functions
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The package declared in the "AndroidManifest.xml" file has to match the "QtAndroidService.java" package
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Pay attention at the service section of the "AndroidManifest.xml" and be very accurate when you write "android:name", "android:process", "android.app.lib_name"
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The example starts the service on demand by calling the static method callStaticMethod("serviceStart"). If you want you can start the service at boot time.