diff options
author | Assam Boudjelthia <assam.boudjelthia@qt.io> | 2020-03-04 16:26:51 +0200 |
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committer | Assam Boudjelthia <assam.boudjelthia@qt.io> | 2020-03-12 19:07:18 +0200 |
commit | fe69fb5371b193288fcb1b38d70c9fd4ac4fd74a (patch) | |
tree | a575b5b298c097940ea60891b24559799b2a5e62 /examples/androidextras/jnimessenger/jnimessenger.cpp | |
parent | a55cae70165206bd2a04306291fb3442968b69c3 (diff) |
Introduce new example JNI Messenger
This examples shows the proper way to communication between QML/C++
and Java in both ways. This example calls a Java method from QML and
C++, then the Java method will also call back a C++ function that will
be forwarded to a QML connection.
Task-number: QTBUG-80717
Change-Id: I96d9551d1abcaf80899c4dd3c727a267fb6f3c07
Reviewed-by: BogDan Vatra <bogdan@kdab.com>
Diffstat (limited to 'examples/androidextras/jnimessenger/jnimessenger.cpp')
-rw-r--r-- | examples/androidextras/jnimessenger/jnimessenger.cpp | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/examples/androidextras/jnimessenger/jnimessenger.cpp b/examples/androidextras/jnimessenger/jnimessenger.cpp new file mode 100644 index 0000000..3c309ba --- /dev/null +++ b/examples/androidextras/jnimessenger/jnimessenger.cpp @@ -0,0 +1,86 @@ +/**************************************************************************** +** +** 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 +** contributors may be used to endorse or promote products derived +** from this software without specific prior written permission. +** +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** 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, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "jnimessenger.h" + +#include <QAndroidJniObject> +#include <QAndroidJniEnvironment> +#include <QtAndroid> + +JniMessenger *JniMessenger::m_instance = nullptr; + +static void callFromJava(JNIEnv *env, jobject /*thiz*/, jstring value) +{ + emit JniMessenger::instance()->messageFromJava(env->GetStringUTFChars(value, nullptr)); +} + +JniMessenger::JniMessenger(QObject *parent) : QObject(parent) +{ + m_instance = this; + + JNINativeMethod methods[] {{"callFromJava", "(Ljava/lang/String;)V", reinterpret_cast<void *>(callFromJava)}}; + QAndroidJniObject javaClass("org/qtproject/example/jnimessenger/JniMessenger"); + + QAndroidJniEnvironment env; + jclass objectClass = env->GetObjectClass(javaClass.object<jobject>()); + env->RegisterNatives(objectClass, + methods, + sizeof(methods) / sizeof(methods[0])); + env->DeleteLocalRef(objectClass); +} + +void JniMessenger::printFromJava(const QString &message) +{ + QAndroidJniObject javaMessage = QAndroidJniObject::fromString(message); + QAndroidJniObject::callStaticMethod<void>("org/qtproject/example/jnimessenger/JniMessenger", + "printFromJava", + "(Ljava/lang/String;)V", + javaMessage.object<jstring>()); +} |