volumeandbrightnessobserver.cpp

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// Copyright (C) 2025 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

#include <QGuiApplication>

#include <QJniObject>

#include <QDebug>

#include "volumeandbrightnessobserver.h"

#include "qtjenny_output/jenny/proxy/android_provider_SystemProxy.h"

#include "qtjenny_output/jenny/proxy/android_os_LooperProxy.h"

VolumeAndBrightnessObserver::VolumeAndBrightnessObserver(QObject *parent, BackEnd *backend) : QObject(parent), m_backend(backend)

    m_context = m_backend->m_context;

    m_audioManager = m_backend->m_audioManager;

    m_system = m_backend->m_system;

    m_handler = android::os::HandlerProxy::newInstance(

        android::os::LooperProxy::getMainLooper().object<jobject>(),

        qt_getProxy("org/qtproject/qtjennydemo/NativeInvocationHandler").object<jobject>());

    m_resolver = m_context.getContentResolver();

    m_lastBrightness = m_backend->m_brightness;

    m_lastVolume = m_backend->m_volume;

void VolumeAndBrightnessObserver::start()

    m_contentObserver.setHandler(m_handler);

    jlong nativeHandle = reinterpret_cast<jlong>(static_cast<NativeInterface*>(&m_contentObserver));

    QJniObject handler("org/qtproject/qtjennydemo/NativeInvocationHandler", nativeHandle);

    m_volumeObserver = QJniObject("org/qtproject/qtjennydemo/ContentObserverProxy",

                                 "(Landroid/os/Handler;Lorg/qtproject/qtjennydemo/NativeInvocationHandler;)V",

                                 m_handler->object<jobject>(),

                                 handler.object<jobject>());

    m_resolver.registerContentObserver(

        m_system.getCONTENT_URI().object<jobject>(), true, m_volumeObserver.object<jobject>());

jobject VolumeAndBrightnessObserver::handleMessage(jobject arg0)

    int currentMusicVolume = m_audioManager.getStreamVolume(m_audioManager.STREAM_MUSIC);

    if (currentMusicVolume != m_lastVolume) {

        m_lastVolume = currentMusicVolume;

        emit volumeChangeObserved(currentMusicVolume);

    int currentBrightness = m_system.getInt(

        m_resolver->object<jobject>(),

        QJniObject::fromString(m_system.SCREEN_BRIGHTNESS).object<jstring>(),

        0 // default value if not found

);

    if (currentBrightness != m_lastBrightness) {

        m_lastBrightness = currentBrightness;

        emit brightnessChangeObserved(currentBrightness);

    QJniObject res("java/lang/Boolean", true);

    QJniEnvironment env;

    return env->NewGlobalRef(res.object<jobject>());