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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
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** 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,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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****************************************************************************/
/*!
\title Android Service with BroadcastReceiver - Same Lib File
\ingroup examples-qtandroidextras
\example services/servicebroadcastsamelib
\brief Demonstrates how to run an Android service in a separate process,
and how to communicate with Qt using a BroadcastReceiver.
\image androidservices.png
This example demonstrates how to create and run an Android service in its
own process using the same main \c .so lib file, and then exchange data
between QML/C++ and the Java service using a
\l{Android: BroadcastReceiver}{BroadcastReceiver}.
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, and with the BroadcastReceiver you
don't need native calls to exchange messages with Qt, 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/servicebroadcastsamelib/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 sends a broadcast
to the BroadcastReceiver, which in turn will call 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:
\quotefromfile services/servicebroadcastsamelib/android/AndroidManifest.xml
\skipto <service
\printuntil </service>
\section1 Start the Service
Since the service is run using the same \c .so lib file with different arguments
for the service, you must handle the arguments. For the main application use:
\quotefromfile services/servicebroadcastsamelib/main.cpp
\skipto (argc
\printline (argc
Then take the following steps:
\list 1
\li Register the native method
\li Create the BroadcastReceiver in a custom Java class:
\quotefromfile services/servicebroadcastsamelib/android/src/org/qtproject/example/qtandroidservice/ActivityUtils.java
\skipto package
\printuntil /^\}/
\li Register the BroadcastReceiver:
\quotefromfile services/common/qtandroidservice.cpp
\skipto :registerBroadcastReceiver
\printuntil /^\}/
\li Call the \l{Android: Service startService}{startService()}
method, as follows:
\quotefromfile services/common/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.
\li Then, you have to add the necessary \l Connections, as described in
\l{Qt JNI Messenger}{Qt JNI Messenger Example}.
\endlist
Handle the service argument as follows:
\quotefromfile services/servicebroadcastsamelib/main.cpp
\skipto else if
\printuntil app.exec();
\sa {Android Service with BroadcastReceiver}, {Android Services},
{Qt for Android}, {Qt Android Extras}
*/
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