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/****************************************************************************
**
** Copyright (C) 2020 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtAndroidExtras module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
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** accordance with the commercial license agreement provided with the
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** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
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****************************************************************************/
/*!
\title Native Android Service in Same Process
\ingroup examples-qtandroidextras
\example services/servicesameprocess
\brief Demonstrates how to run an Android service in the main process,
and how to communicate between QML/C++ and a Java service.
\image androidservices.png
This example demonstrates how to create and run a simple Android service in
the same process as the main activity \c QtActivity, and then exchange data
between QML/C++ and the Java service. This service is a pure Java
implementation.
When clicking the \uicontrol {Send to Service} button, the name entered in
the QML view, Qt, in this case, is sent to the Android service. Then, the service
replies back with a message \c {Hello Qt} which is printed in the QML view.
\include examples-run.qdocinc
\section1 Create the Service
When running the app's process, you can extend either \c QtService or \c Service.
Extending \c QtService allows Qt to load all the necessary libraries to load
Qt components correctly and call native methods on Android. However, here
the service is running in the same process, so extending either class works.
Start by creating the Java service class. This is a normal Android \c Service
that receives a name from QML and replies back with \c {Hello <name>}:
\quotefromfile services/servicesameprocess/android/src/org/qtproject/example/qtandroidservice/QtAndroidService.java
\skipto package
\printuntil /^\}/
In the overwritten method
\l{Android: Service onStartCommand}{onStartCommand()}, the service receives a
name from the calling intent, then calls the native method
\c {sendToQt(String message)}. For more information on managing native
calls in Qt, see \l{Calling QML/C++ Functions from Java Code}.
\section1 Manage the AndroidManifest.xml File
To use the service, it must be declared in the \c AndroidManifest.xml
file. When using pure Android Service in the main app process, use the following:
\quotefromfile services/servicesameprocess/android/AndroidManifest.xml
\skipto <service
\printuntil </service>
\section1 Start the Service
Before starting the service, register the native methods, then call the
\l{Android: Service startService}{startService()} method, as follows:
\quotefromfile services/servicesameprocess/qtandroidservice.cpp
\skipto sendToService
\printuntil /^\}/
This function is used to start the Service. If the service is already running,
it will only send the names without starting a new service instance.
Then, you have to add the necessary \l Connections, as described in
\l{Qt JNI Messenger}{Qt JNI Messenger Example}.
\sa {Android Services}, {Qt for Android}, {Qt Android Extras}
*/
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