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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.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** 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
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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****************************************************************************/
/*!
\title Android Service with Qt Remote Objects
\ingroup examples-qtandroidextras
\example services/serviceremoteobjects
\brief Demonstrates how to run an Android service in a separate process,
and how to communicate between the service process and the main process
using Qt Remote Objects.
\image androidservices.png
This example demonstrates how to create and run an Android service in
a separate process from the main application process, and then exchange data
between QML/C++ and the Java service using \l{Qt Remote Objects}.
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
To start a service in its own process, extend the \c QtService class for
your service. Extending \c QtService allows the service to load the necessary
Qt libraries used for Qt, like \l{Qt Remote Objects} libraries.
Start by creating the Java service class. The following class extends \c QtService
and acts as your service entry point:
\quotefromfile services/serviceremoteobjects/android/src/org/qtproject/example/qtandroidservice/QtAndroidService.java
\skipto package
\printuntil /^\}/
This class can have any logic you want using Java code. However, you don't need
any logic to communicate with Qt as that will be done using Qt Remote Objects.
\section1 Manage the AndroidManifest.xml File
To use the service, it must be declared in the \c AndroidManifest.xml
file as follows:
\quotefromfile services/serviceremoteobjects/android/AndroidManifest.xml
\skipto <service
\printuntil </service>
The important part of this service declaration is the \c lib_name part.
It will ensure that the service is run by the service's own lib file:
\quotefromfile services/serviceremoteobjects/android/AndroidManifest.xml
\skipto android:value="service"
\printuntil android:value="service"
\section1 Handle the Application Start
To start the service, call the following function from the application's
\c main():
\quotefromfile services/serviceremoteobjects/main.cpp
\skipto startService
\printuntil /^\}/
\section1 Handle the Service Start
\l{QAndroidService} is used to create the service process. For the service
to start from its own \c .so lib file, create a sub-project with the following
\c .pro file:
\quotefromfile services/serviceremoteobjects/service.pro
\printuntil CONFIG
\section1 Communication with Qt Remote Objects
To use \l{Qt Remote Objects}, define a \c .rep file:
\quotefromfile services/common/qtandroidservice.rep
\skipto class
\printuntil /^\}/
Define the \c .rep source file in the service project \c .pro:
\quotefromfile services/serviceremoteobjects/service.pro
\skipto REPC_SOURCE
\printline REPC_SOURCE
And in the application's \c .pro file:
\quotefromfile services/serviceremoteobjects/serviceremoteobjectsclient.pro
\skipto REPC_REPLICA
\printline REPC_REPLICA
Then define the class used by Qt Remote Objects, which has a
\c sendToService() slot and a \c messageFromService() signal:
\quotefromfile services/common/qtandroidservice_ro.h
\skipto include
\printuntil /^\};/
Include the class in the previous snippet in \c main.cpp:
\quotefromfile services/serviceremoteobjects/main.cpp
\skipto _replica.h
\printline _replica.h
Now, in the service's \c service_main.cpp, create the \l{QRemoteObjectHost}
node and start \l{QAndroidService}:
\quotefromfile services/serviceremoteobjects/service_main.cpp
\skipto include
\printuntil /^\}/
In the application's \c main.cpp, create the client node and connect it
to the source node created in the service and connect it to the QML view:
\quotefromfile services/serviceremoteobjects/main.cpp
\skipto QRemoteObjectNode
\printuntil sendToService
Then, add a \l Connections element to watch for the incoming messages from
the service:
\quotefromfile services/common/main.qml
\skipto Connections
\printuntil /^\ {4}\}/
And set the \c onClicked for the sending button to:
\quotefromfile services/common/main.qml
\skipto onClicked
\printline onClicked
\sa {Android Service with Qt Remote Objects - Same Lib File},
{Android Services}, {Qt for Android}, {Qt Android Extras}
*/
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