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);
}

extern "C" JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved) {
    JNIEnv* env;
    if (vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6) != JNI_OK) {
        return JNI_ERR;
    }

    // Register your native method ONCE when the library loads
    jclass javaClass = env->FindClass("org/qtproject/example/appwaterLevelSensor/WaterLevelReceiver");
    if (javaClass) {
        static JNINativeMethod methods[] = {
            {"updateWaterLevel", "([B)V", (void *)handleWaterLevelUpdate}
        };
        env->RegisterNatives(javaClass, methods, 1);
    }

    return JNI_VERSION_1_6;
}



service::service(QObject *parent)
    : QObject{parent}
{
    if(QSysInfo::productType() == "android") {
        qDebug() << "Running android service";
        // QJniEnvironment env;
        // // if (env->ExceptionCheck()) env->ExceptionClear();
        // // static bool nativesRegistered = false;

        // // if(!nativesRegistered) {
        // //     // jclass javaClass = env.findClass("org/qtproject/example/appwaterLevelSensor/WaterLevelReceiver");
        // //     // if (javaClass) {
        // //     //     JNINativeMethod methods[] = {{"updateWaterLevel", "([B)V", (void *)handleWaterLevelUpdate}};
        // //     //     if (env->RegisterNatives(javaClass, methods, 1) < 0) {
        // //     //         qDebug() << "RegisterNatives failed!";
        // //     //     } else {
        // //     //         nativesRegistered = true;
        // //     //     }
        // //     // } else {
        // //     //     qDebug() << "Could not find WaterLevelReceiver class";
        // //     // }
        // //     // if (env->ExceptionCheck()) env->ExceptionClear();
        // // }
        // using namespace QtJniTypes;
        // using namespace QNativeInterface;



        // auto *androidApp = qGuiApp->nativeInterface<QAndroidApplication>();
        // // Context context = androidApp->context();
        // QJniObject context = QNativeInterface::QAndroidApplication::context();
        // auto serviceClass = env.findClass(Traits<WaterLevelService>::className());
        // if (!serviceClass) {
        //     qDebug() << "FAILED to find WaterLevelService class!";
        //     env->ExceptionDescribe();   // VERY important
        //     env->ExceptionClear();
        //     return;
        // }
        // if (context.isValid()) {
        //     QJniObject::callStaticMethod<
        //         void>(
        //         "org/qtproject/example/appwaterLevelSensor/WaterLevelServiceStarter",
        //         "startService",
        //         "(Landroid/content/Context;)V",
        //         context.object<jobject>());
        // }
    }
}

void service::moveAppToBackground()
{
    QJniObject activity = QNativeInterface::QAndroidApplication::context();
    if (activity.isValid()) {
        qDebug() << "Moved app to background";
        activity.callMethod<jboolean>("moveTaskToBack", "(Z)Z", true);
    }
    qDebug() << "Closing";
}

void service::begin() {


    // Only call this once the UI is visible
    QJniObject context = QNativeInterface::QAndroidApplication::context();
    QJniObject::callStaticMethod<void>(
        "org/qtproject/example/appwaterLevelSensor/WaterLevelServiceStarter",
        "startService",
        "(Landroid/content/Context;)V",
        context.object<jobject>()
        );
}