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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtAndroidExtras module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** 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.
**
** $QT_END_LICENSE$
**
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****************************************************************************/
/*!
\title Android Custom Activity
\ingroup examples-qtandroidextras
\example customactivity
\brief Demonstrates working with custom Android activities.
\image customactivity.png
This example demonstrates how to create an Android Activity and run it from
your Qt application. The activity is composed of a Java class and an Android
XML layout which is started from the main app. The activity can send back data
after finishing which can be used in QML.
When you click the \uicontrol{"Start custom Android activity"} button, the
activity is started, and the activity has a text view and a button to exit.
The activity can either use the button or the back gesture to go back.
\include examples-run.qdocinc
\section1 Create Activity Class
Define an Android class called \c CustomActivity in the CustomActivity.java
file as follows:
\quotefromfile customactivity/android/src/org/qtproject/example/activityhandler/CustomActivity.java
\skipto package
\printuntil /^\}/
The Activity's layout is defined at \e {customactivity/android/res/layout/second_activity.xml}.
To use this Activity, it must be defined in the \e AndroidManifest.xml file
as follows:
\quotefromfile customactivity/android/AndroidManifest.xml
\skipto :custom_activity
\printuntil </activity>
\note To use any native JNI calls, you must extend \c QtActivity instead of
\c Activity.
\section1 Start the Activity
To start an Activity from Qt, you need to create an intent using \l{QAndroidIntent},
then call \l{QtAndroid::startActivity} providing the intent, a custom request
code, and a callback function. The latter is called after the activity has
finished. You can start the activity as follows:
\quotefromfile customactivity/activityhandler.cpp
\skipto showSecondActivity
\printuntil });
\printline }
Then, define the callback function that is called directly after the activity
is done:
\quotefromfile customactivity/activityhandler.cpp
\skipto ActivityHandler::activityReceiver
\printuntil }
\note You can first check that the \c requestCode and \c resultCode are correct.
To connect C++ with QML, add an instance of the C++ class that is handling
the JNI logic as a QML property in the \e main.cpp file:
\quotefromfile customactivity/main.cpp
\skipto ActivityHandler
\printuntil setContextProperty
Then, add a \l Connections element to watch for messages from C++ in the
\e main.qml file:
\quotefromfile customactivity/main.qml
\skipto Connections
\printuntil /^\ {4}\}/
And set the \c onClicked for the \uicontrol{"Start custom Android activity"}
button to:
\quotefromfile services/common/main.qml
\skipto onClicked
\printline onClicked
\sa {Qt for Android}, {Qt Android Extras}
*/
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