C++ QAndroidJniEnvironment::ExceptionOccurred方法代码示例

void QLowEnergyControllerPrivate::readDescriptor(
        const QSharedPointer<QLowEnergyServicePrivate> service,
        const QLowEnergyHandle /*charHandle*/,
        const QLowEnergyHandle descriptorHandle)
{
    Q_ASSERT(!service.isNull());

    QAndroidJniEnvironment env;
    bool result = false;
    if (hub) {
        qCDebug(QT_BT_ANDROID) << "Read descriptor with handle"
                               <<  descriptorHandle << service->uuid;
        result = hub->javaObject().callMethod<jboolean>("readDescriptor",
                      "(I)Z", descriptorHandle);
    }

    if (env->ExceptionOccurred()) {
        env->ExceptionDescribe();
        env->ExceptionClear();
        result = false;
    }

    if (!result)
        service->setError(QLowEnergyService::DescriptorReadError);
}

void QLowEnergyControllerPrivate::writeDescriptor(
        const QSharedPointer<QLowEnergyServicePrivate> service,
        const QLowEnergyHandle /*charHandle*/,
        const QLowEnergyHandle descHandle,
        const QByteArray &newValue)
{
    Q_ASSERT(!service.isNull());

    QAndroidJniEnvironment env;
    jbyteArray payload;
    payload = env->NewByteArray(newValue.size());
    env->SetByteArrayRegion(payload, 0, newValue.size(),
                            (jbyte *)newValue.constData());

    bool result = false;
    if (hub) {
        qCDebug(QT_BT_ANDROID) << "Write descriptor with handle " << descHandle
                 << newValue.toHex() << "(service:" << service->uuid << ")";
        result = hub->javaObject().callMethod<jboolean>("writeDescriptor", "(I[B)Z",
                                                        descHandle, payload);
    }

    if (env->ExceptionOccurred()) {
        env->ExceptionDescribe();
        env->ExceptionClear();
        result = false;
    }

    env->DeleteLocalRef(payload);

    if (!result)
        service->setError(QLowEnergyService::DescriptorWriteError);
}

void QLowEnergyControllerPrivate::readCharacteristic(
        const QSharedPointer<QLowEnergyServicePrivate> service,
        const QLowEnergyHandle charHandle)
{
    Q_ASSERT(!service.isNull());

    if (!service->characteristicList.contains(charHandle))
        return;

    QAndroidJniEnvironment env;
    bool result = false;
    if (hub) {
        qCDebug(QT_BT_ANDROID) << "Read characteristic with handle"
                               <<  charHandle << service->uuid;
        result = hub->javaObject().callMethod<jboolean>("readCharacteristic",
                      "(I)Z", charHandle);
    }

    if (env->ExceptionOccurred()) {
        env->ExceptionDescribe();
        env->ExceptionClear();
        result = false;
    }

    if (!result)
        service->setError(QLowEnergyService::CharacteristicReadError);
}

void QASystemDispatcher::registerNatives()
{
#ifdef Q_OS_ANDROID
    QAndroidJniEnvironment env;
    jclass clazz = env->FindClass(JCLASS_Name);
    if (!clazz)
    {
        qCritical() << QString("Can't find %1 class").arg(QString(JCLASS_Name));
        return ;
    }

    JNINativeMethod methods[] =
    {
        {"jniEmit", EMIT_SIGNATURE, (void *)&jniEmit},
    };

    int numMethods = sizeof(methods) / sizeof(methods[0]);
    if (env->RegisterNatives(clazz, methods, numMethods) < 0) {
        if (env->ExceptionOccurred()) {
            env->ExceptionDescribe();
            env->ExceptionClear();
            qCritical() << "Exception occurred!!!";
            return;
        }
    }
#endif
}

static jobject createHashMap(const QVariantMap &data) {
    QAndroidJniEnvironment env;

    jclass mapClass = env->FindClass("java/util/HashMap");

    if (mapClass == NULL)  {
        qWarning() << "Failed to find class" << "java/util/HashMap";
        return NULL;
    }

    jclass integerClass = env->FindClass("java/lang/Integer");

    jmethodID integerConstructor = env->GetMethodID(integerClass, "<init>", "(I)V");

    jclass booleanClass = env->FindClass("java/lang/Boolean");
    jmethodID booleanConstructor = env->GetMethodID(booleanClass,"<init>","(Z)V");


    jsize map_len = data.size();

    jmethodID init = env->GetMethodID(mapClass, "<init>", "(I)V");
    jobject hashMap = env->NewObject( mapClass, init, map_len);

    jmethodID put = env->GetMethodID( mapClass, "put",
                "(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;");


    QMapIterator<QString, QVariant> iter(data);
    while (iter.hasNext()) {
        iter.next();

//        qDebug() << iter.key() << iter.value();
        QString key = iter.key();
        jstring jkey = env->NewStringUTF(key.toLocal8Bit().data());
        QVariant v = iter.value();
        if (v.type() == QVariant::String) {
            QString str = v.toString();
            jstring vString = env->NewStringUTF(str.toLocal8Bit().data());
            env->CallObjectMethod(hashMap,put,jkey,vString);
        } else if (v.type() == QVariant::Int) {
            jobject integer = env->NewObject(integerClass,integerConstructor,v.toInt());
            env->CallObjectMethod(hashMap,put,jkey,integer);
        } else if (v.type() == QVariant::Bool) {
            jobject boolean = env->NewObject(booleanClass,booleanConstructor,v.toBool());
            env->CallObjectMethod(hashMap,put,jkey,boolean);
        } else {
            qWarning() << "QASystemDispatcher: Non-supported data type - " <<  v.type();
        }
     }

    if (env->ExceptionOccurred()) {
        env->ExceptionDescribe();
        env->ExceptionClear();
    }

    return hashMap;
}

    void run() {
        // Example code to create WebView using C++ method.
        // However, it is not recommended to construct
        // everything using C++. It is very troublesome.
        // It just show how can you execute code with
        // Android application UI thread
        QAndroidJniEnvironment env;

        QAndroidJniObject activity = QAndroidJniObject::callStaticObjectMethod("org/qtproject/qt5/android/QtNative",
                                                                               "activity", "()Landroid/app/Activity;");
        QAndroidJniObject webView("android/webkit/WebView",
                                  "(Landroid/content/Context;)V",
                                   activity.object<jobject>());

        QAndroidJniObject frameLayout = activity.callObjectMethod("findViewById","(I)Landroid/view/View;",
                                                                  0x01020002); // Hard coded value of android.R.id.content
        QAndroidJniObject layout("android/widget/RelativeLayout",
                                  "(Landroid/content/Context;)V",
                                   activity.object<jobject>());

        QAndroidJniObject params = QAndroidJniObject("android/view/ViewGroup$LayoutParams",
                                    "(II)V",
                                    (int) 0xffffffff,
                                    (int) 0xffffffff);

        layout.callMethod<void>("addView",
                                "(Landroid/view/View;Landroid/view/ViewGroup$LayoutParams;)V",
                                webView.object<jobject>(),
                                params.object<jobject>());

        frameLayout.callMethod<void>("addView",
                                     "(Landroid/view/View;Landroid/view/ViewGroup$LayoutParams;)V",
                                     layout.object<jobject>(),
                                     params.object<jobject>());

        QAndroidJniObject url = QAndroidJniObject::fromString("http://qt-project.org");

        webView.callMethod<void>("loadUrl","(Ljava/lang/String;)V",url.object<jstring>());

        if (env->ExceptionOccurred()) {
            env->ExceptionDescribe();
            env->ExceptionClear();
        }

    }

void QLowEnergyControllerPrivate::writeCharacteristic(
        const QSharedPointer<QLowEnergyServicePrivate> service,
        const QLowEnergyHandle charHandle,
        const QByteArray &newValue,
        bool writeWithResponse)
{
    //TODO don't ignore WriteWithResponse, right now we assume responses
    Q_ASSERT(!service.isNull());

    if (!service->characteristicList.contains(charHandle))
        return;

    QAndroidJniEnvironment env;
    jbyteArray payload;
    payload = env->NewByteArray(newValue.size());
    env->SetByteArrayRegion(payload, 0, newValue.size(),
                            (jbyte *)newValue.constData());

    bool result = false;
    if (hub) {
        qCDebug(QT_BT_ANDROID) << "Write characteristic with handle " << charHandle
                 << newValue.toHex() << "(service:" << service->uuid
                 << ", writeWithResponse:" << writeWithResponse << ")";
        result = hub->javaObject().callMethod<jboolean>("writeCharacteristic", "(I[BI)Z",
                      charHandle, payload,
                      writeWithResponse ?  QLowEnergyService::WriteWithResponse : QLowEnergyService::WriteWithoutResponse);
    }

    if (env->ExceptionOccurred()) {
        env->ExceptionDescribe();
        env->ExceptionClear();
        result = false;
    }

    env->DeleteLocalRef(payload);

    if (!result)
        service->setError(QLowEnergyService::CharacteristicWriteError);
}

static QVariantMap createVariantMap(jobject data) {
    QVariantMap res;

    QAndroidJniEnvironment env;
    /* Reference : https://community.oracle.com/thread/1549999 */

    // Get the HashMap Class
    jclass jclass_of_hashmap = (env)->GetObjectClass(data);

    // Get link to Method "entrySet"
    jmethodID entrySetMethod = (env)->GetMethodID(jclass_of_hashmap, "entrySet", "()Ljava/util/Set;");

    // Invoke the "entrySet" method on the HashMap object
    jobject jobject_of_entryset = env->CallObjectMethod(data, entrySetMethod);

    // Get the Set Class
    jclass jclass_of_set = (env)->FindClass("java/util/Set"); // Problem during compilation !!!!!

    if (jclass_of_set == 0) {
         qWarning() << "java/util/Set lookup failed\n";
         return res;
    }

    jclass jclass_of_string = env->FindClass("java/lang/String");
    jclass jclass_of_integer = env->FindClass("java/lang/Integer");
    jclass jclass_of_boolean = env->FindClass("java/lang/Boolean");


    // Get link to Method "iterator"
    jmethodID iteratorMethod = env->GetMethodID(jclass_of_set, "iterator", "()Ljava/util/Iterator;");

    // Invoke the "iterator" method on the jobject_of_entryset variable of type Set
    jobject jobject_of_iterator = env->CallObjectMethod(jobject_of_entryset, iteratorMethod);

    // Get the "Iterator" class
    jclass jclass_of_iterator = (env)->FindClass("java/util/Iterator");

    // Get link to Method "hasNext"
    jmethodID hasNextMethod = env->GetMethodID(jclass_of_iterator, "hasNext", "()Z");

    jmethodID nextMethod = env->GetMethodID(jclass_of_iterator, "next", "()Ljava/lang/Object;");

    while (env->CallBooleanMethod(jobject_of_iterator, hasNextMethod) ) {
        QAndroidJniObject entry = env->CallObjectMethod(jobject_of_iterator,nextMethod);
        QAndroidJniObject key = entry.callObjectMethod("getKey","()Ljava/lang/Object;");
        QAndroidJniObject value = entry.callObjectMethod("getValue","()Ljava/lang/Object;");
        QString k = key.toString();

        if (!value.isValid())
            continue;

        if (env->IsInstanceOf(value.object<jobject>(),jclass_of_boolean)) {
            res[k] = QVariant::fromValue<bool>(value.callMethod<jboolean>("booleanValue","()Z"));
        } else if (env->IsInstanceOf(value.object<jobject>(),jclass_of_integer)) {
            res[k] = value.callMethod<jint>("intValue","()I");
        } else if (env->IsInstanceOf(value.object<jobject>(),jclass_of_string)) {
            QString v = value.toString();
            res[k] = v;
        }
    }

    if (env->ExceptionOccurred()) {
        env->ExceptionDescribe();
        env->ExceptionClear();
    }

    // Delete local reference
    return res;
}