WaterLevelSensor/service.cpp

#include "service.h"

#include <QGuiApplication>
#include <QtCore/private/qandroidtypes_p.h>
#include <QtCore/qjniobject.h>
#include <QtCore/qcoreapplication.h>
#include <QSysInfo>
#include <QtCore/private/qandroidextras_p.h>

// Q_DECLARE_JNI_CLASS(Intent, "android/content/Intent")
Q_DECLARE_JNI_CLASS(ComponentName, "android/content/ComponentName")
Q_DECLARE_JNI_CLASS(WaterLevelService, "org/qtproject/example/appwaterLevelSensor/WaterLevelService")


static volatile float level = -1;

static void handleWaterLevelUpdate(JNIEnv *env, jobject /*obj*/, jbyteArray data) {
    jbyte *bytes = env->GetByteArrayElements(data, nullptr);
    jsize len = env->GetArrayLength(data);

    // Process your data here
    qDebug() << "Received data from Java broadcast! Length:" << len;


    level = *((float *) (bytes));

    qDebug() << "Level received as: " << level;

    env->ReleaseByteArrayElements(data, bytes, JNI_ABORT);
}


service::service(QObject *parent)
    : QObject{parent}
{
    if(QSysInfo::productType() == "android") {
        qDebug() << "Running android service";

        using namespace QtJniTypes;
        using namespace QNativeInterface;


        JNINativeMethod methods[] = {
            {"updateWaterLevel", "([B)V", (void *)handleWaterLevelUpdate}
        };


        // auto *androidApp = qGuiApp->nativeInterface<QAndroidApplication>();
        // Context context = androidApp->context();
        QJniObject context = QNativeInterface::QAndroidApplication::context();

        QJniEnvironment env;
        auto serviceClass = env.findClass(Traits<WaterLevelService>::className());
        if (!serviceClass) {
            qDebug() << "FAILED to find WaterLevelService class!";
            env->ExceptionDescribe();   // VERY important
            env->ExceptionClear();
            return;
        }

        jclass javaClass = env.findClass("org/qtproject/example/appwaterLevelSensor/WaterLevelReceiver");
        env->RegisterNatives(javaClass, methods, 1);


        QJniObject::callStaticMethod<void>(
            "org/qtproject/example/appwaterLevelSensor/WaterLevelServiceStarter",
            "startService",
            "(Landroid/content/Context;)V",
            context.object<jobject>());  // pass the QtActivity instance            );

        // QJniObject activity = QNativeInterface::QAndroidApplication::context();
        // activity.callMethod<void>("startWaterLevelService", "()V");
        // Intent serviceIntent(activity, serviceClass);
        // activity.callMethod<WaterLevelService>("startWaterLevelService");

        // activity.callMethod<()
        // QJniObject::callStaticMethod<void>(
        //     "org/qtproject/example/appwaterLevelSensor/WaterLevelService",
        //     "startQtAndroidService",
        //     "(Landroid/content/Context;)V",
        //     activity.object<jobject>()
        //     );

        // activity.callMethod<void>("startWaterLevelService", "()V");        // Intent serviceIntent(context, serviceClass);
        // context.callMethod<ComponentName>("startService", serviceIntent);

        // context.callMethod<ComponentName>(
        //     "startForegroundService",
        //     serviceIntent
        //     );
        // QJniObject className = QJniObject::fromString(
        //     "org.qtproject.example.appwaterLevelSensor.WaterLevelService"
        //     );

        // QJniObject serviceClassObj = QJniObject::callStaticObjectMethod(
        //     "java/lang/Class",
        //     "forName",
        //     "(Ljava/lang/String;)Ljava/lang/Class;",
        //     className.object<jstring>()
        //     );

        // QJniObject intent(
        //     "android/content/Intent",
        //     "(Landroid/content/Context;Ljava/lang/Class;)V",
        //     context.object(),
        //     serviceClassObj.object()
        //     );

        // context.callObjectMethod(
        //     "startForegroundService",
        //     "(Landroid/content/Intent;)Landroid/content/ComponentName;",
        //     intent.object()
        //     );        // WaterLevelService::callStaticMethod<void>("startQtAndroidService", context);
    }
}