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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the documentation 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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** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** **********************************************************************/
//! [Working with lists]
QStringList getTrackTitles(const QAndroidJniObject &album) {
QStringList stringList;
QAndroidJniObject list = album.callObjectMethod("getTitles",
"()Ljava/util/List;");
if (list.isValid()) {
const int size = list.callMethod<jint>("size");
for (int i = 0; i < size; ++i) {
QAndroidJniObject title = list.callObjectMethod("get", "(I)Ljava/lang/Object;", i);
stringList.append(title.toString());
}
}
return stringList;
}
//! [Working with lists]
//! [QAndroidJniObject scope]
void functionScope()
{
QString helloString("Hello");
jstring myJString = 0;
{
QAndroidJniObject string = QAndroidJniObject::fromString(helloString);
myJString = string.object<jstring>();
}
// Ops! myJString is no longer valid.
}
//! [QAndroidJniObject scope]
//! [Check for exceptions]
void functionException()
{
QAndroidJniObject myString = QAndroidJniObject::fromString("Hello");
jchar c = myString.callMethod<jchar>("charAt", "(I)C", 1000);
QAndroidJniEnvironment env;
if (env->ExceptionCheck()) {
// Handle exception here.
env->ExceptionClear();
}
}
//! [Check for exceptions]
//! [Registering native methods]
static void fromJavaOne(JNIEnv *env, jobject thiz, jint x)
{
Q_UNUSED(env)
Q_UNUSED(thiz)
qDebug() << x << "< 100";
}
static void fromJavaTwo(JNIEnv *env, jobject thiz, jint x)
{
Q_UNUSED(env)
Q_UNUSED(thiz)
qDebug() << x << ">= 100";
}
void registerNativeMethods() {
JNINativeMethod methods[] {{"callNativeOne", "(I)V", reinterpret_cast<void *>(fromJavaOne)},
{"callNativeTwo", "(I)V", reinterpret_cast<void *>(fromJavaTwo)}};
QAndroidJniObject javaClass("my/java/project/FooJavaClass");
QAndroidJniEnvironment env;
jclass objectClass = env->GetObjectClass(javaClass.object<jobject>());
env->RegisterNatives(objectClass,
methods,
sizeof(methods) / sizeof(methods[0]));
env->DeleteLocalRef(objectClass);
}
void foo()
{
QAndroidJniObject::callStaticMethod<void>("my/java/project/FooJavaClass", "foo", "(I)V", 10); // Output: 10 < 100
QAndroidJniObject::callStaticMethod<void>("my/java/project/FooJavaClass", "foo", "(I)V", 100); // Output: 100 >= 100
}
//! [Registering native methods]
//! [Java native methods]
class FooJavaClass
{
public static void foo(int x)
{
if (x < 100)
callNativeOne(x);
else
callNativeTwo(x);
}
private static native void callNativeOne(int x);
private static native void callNativeTwo(int x);
}
//! [Java native methods]
|
