Android service

Montjet · wrote on 13 Oct 2018, 21:50

Hi,
I am trying to implement android service.
This service should start at boot time what is descripted on: https://www.kdab.com/qt-android-create-android-service-using-qt/
My application is crashing and I don't know why.
What's wrong with my code?

Qt: 5.11.1

Example.pro:

TEMPLATE = subdirs

SUBDIRS += Application.pro Service.pro

Service.pro:

TEMPLATE = lib
TARGET = Service
CONFIG += dll
QT += core
QT += remoteobjects
QT += androidextras


SOURCES += \
    sources/Service.cpp

REPC_SOURCE += \
    replicas/ServiceMessenger.rep

Application.pro:

QT += quick 
QT += remoteobjects
QT += androidextras
CONFIG += c++17

# The following define makes your compiler emit warnings if you use
# any feature of Qt which as been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
    sources/Application.cpp

REPC_REPLICA += \
    replicas/ServiceMessenger.rep

DISTFILES += \
    android/AndroidManifest.xml \
    android/gradle/wrapper/gradle-wrapper.jar \
    android/gradlew \
    android/res/values/libs.xml \
    android/build.gradle \
    android/gradle/wrapper/gradle-wrapper.properties \
    android/gradlew.bat \
    android/src/org/example/service/ServiceServer.java \
    android/src/org/example/service/ServiceBroadcastReceiver.java

ANDROID_PACKAGE_SOURCE_DIR = $$PWD/android

AndroidManifest.xml:

<?xml version="1.0"?>
<manifest package="org.example.example" xmlns:android="http://schemas.android.com/apk/res/android" android:versionName="1.0" android:versionCode="1" android:installLocation="auto">
    <application android:hardwareAccelerated="true" android:name="org.qtproject.qt5.android.bindings.QtApplication" android:label="test" android:icon="@drawable/icon">
        <activity android:configChanges="orientation|uiMode|screenLayout|screenSize|smallestScreenSize|layoutDirection|locale|fontScale|keyboard|keyboardHidden|navigation" android:name="org.qtproject.qt5.android.bindings.QtActivity" android:label="test" android:screenOrientation="unspecified" android:launchMode="singleTop">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>

            <!-- Application arguments -->
            <!-- meta-data android:name="android.app.arguments" android:value="arg1 arg2 arg3"/ -->
            <!-- Application arguments -->

            <meta-data android:name="android.app.lib_name" android:value="-- %%INSERT_APP_LIB_NAME%% --"/>
            <meta-data android:name="android.app.qt_sources_resource_id" android:resource="@array/qt_sources"/>
            <meta-data android:name="android.app.repository" android:value="default"/>
            <meta-data android:name="android.app.qt_libs_resource_id" android:resource="@array/qt_libs"/>
            <meta-data android:name="android.app.bundled_libs_resource_id" android:resource="@array/bundled_libs"/>
            <!-- Deploy Qt libs as part of package -->
            <meta-data android:name="android.app.bundle_local_qt_libs" android:value="-- %%BUNDLE_LOCAL_QT_LIBS%% --"/>
            <meta-data android:name="android.app.bundled_in_lib_resource_id" android:resource="@array/bundled_in_lib"/>
            <meta-data android:name="android.app.bundled_in_assets_resource_id" android:resource="@array/bundled_in_assets"/>
            <!-- Run with local libs -->
            <meta-data android:name="android.app.use_local_qt_libs" android:value="-- %%USE_LOCAL_QT_LIBS%% --"/>
            <meta-data android:name="android.app.libs_prefix" android:value="/data/local/tmp/qt/"/>
            <meta-data android:name="android.app.load_local_libs" android:value="-- %%INSERT_LOCAL_LIBS%% --"/>
            <meta-data android:name="android.app.load_local_jars" android:value="-- %%INSERT_LOCAL_JARS%% --"/>
            <meta-data android:name="android.app.static_init_classes" android:value="-- %%INSERT_INIT_CLASSES%% --"/>
            <!-- Used to specify custom system library path to run with local system libs -->
            <!-- <meta-data android:name="android.app.system_libs_prefix" android:value="/system/lib/"/> -->
            <!--  Messages maps -->
            <meta-data android:value="@string/ministro_not_found_msg" android:name="android.app.ministro_not_found_msg"/>
            <meta-data android:value="@string/ministro_needed_msg" android:name="android.app.ministro_needed_msg"/>
            <meta-data android:value="@string/fatal_error_msg" android:name="android.app.fatal_error_msg"/>
            <!--  Messages maps -->

            <!-- Splash screen -->
            <!-- meta-data android:name="android.app.splash_screen_drawable" android:resource="@drawable/logo"/ -->
            <!-- meta-data android:name="android.app.splash_screen_sticky" android:value="true"/ -->
            <!-- Splash screen -->

            <!-- Service -->
            <service android:process=":qt" android:name=".ServiceServer"/>
            <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>

            <receiver android:name=".ServiceBroadcastReceiver">
                <intent-filter>
                    <action android:name="android.intent.action.BOOT_COMPLETED"/>
                </intent-filter>
            </receiver>
            <!-- android:process=":qt" is needed to force the service to run on a separate
                                                        process than the Activity -->

            <!-- Service -->

            <!-- Background running -->
            <!-- Warning: changing this value to true may cause unexpected crashes if the
                          application still try to draw after
                          "applicationStateChanged(Qt::ApplicationSuspended)"
                          signal is sent! -->
            <meta-data android:name="android.app.background_running" android:value="true"/>
            <!-- Background running -->

            <!-- auto screen scale factor -->
            <meta-data android:name="android.app.auto_screen_scale_factor" android:value="false"/>
            <!-- auto screen scale factor -->

            <!-- extract android style -->
            <!-- available android:values :
                * full - useful QWidget & Quick Controls 1 apps
                * minimal - useful for Quick Controls 2 apps, it is much faster than "full"
                * none - useful for apps that don't use any of the above Qt modules
                -->
            <meta-data android:name="android.app.extract_android_style" android:value="full"/>
            <!-- extract android style -->
    </activity>

    <!-- For adding service(s) please check: https://wiki.qt.io/AndroidServices -->

    </application>

    <uses-sdk android:minSdkVersion="16" android:targetSdkVersion="16"/>
    <supports-screens android:largeScreens="true" android:normalScreens="true" android:anyDensity="true" android:smallScreens="true"/>

    <!-- The following comment will be replaced upon deployment with default permissions based on the dependencies of the application.
         Remove the comment if you do not require these default permissions. -->
    <!-- %%INSERT_PERMISSIONS -->

    <!-- The following comment will be replaced upon deployment with default features based on the dependencies of the application.
         Remove the comment if you do not require these default features. -->
    <!-- %%INSERT_FEATURES -->


</manifest>

Application.cpp:

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QQmlContext>
#include <QAndroidJniObject>
#include <QAndroidJniEnvironment>
#include <QtAndroid>
#include "rep_ServiceMessenger_replica.h"

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);
    QQmlApplicationEngine engine;


	//
	QRemoteObjectNode repNode;
    repNode.connectToNode(QUrl(QStringLiteral("local:replica")));
    QSharedPointer<ServiceMessengerReplica> rep(repNode.acquire<ServiceMessengerReplica>());
    bool res = rep->waitForSource();
    Q_ASSERT(res);
    QObject::connect(rep.data(), &ServiceMessengerReplica::pong, [](const QString &msg){
        qDebug() << "aaaaaaaaaaaaaaaaaaaaaa:" << msg;
    });
    qDebug() << "Test Test Test Test Test Test Test Test";
    rep->ping("Hello");
	
	//

    return app.exec();
}

Service.cpp:

#include <QAndroidService>
#include "rep_ServiceMessenger_source.h"
 
class ServiceMessenger : public ServiceMessengerSource {
public slots:
    // PingPongSource interface
    void ping(const QString &msg) override {
        emit pong(msg + " from server");
    }
};
 
int main(int argc, char *argv[])
{
    QAndroidService app(argc, argv);
 
    QRemoteObjectHost srcNode(QUrl(QStringLiteral("local:replica")));
    ServiceMessenger pingPongServer;
    srcNode.enableRemoting(&pingPongServer);
 
    return app.exec();
}

ServiceMessenger.rep:

class ServiceMessenger {
    SLOT(void ping(const QString &msg));
    SIGNAL(pong(const QString &msg));
}

"Test Test Test Test Test Test Test Test" is not displayed.
Error:

Abort message:'..\service-test\sources\Application.cpp:21 ((null)): ASSERT: "res" in file ..\service-test\sources\Application.cpp, line 21

Help :(

SGaist · wrote on 14 Oct 2018, 12:23

Hi,

I haven't work with QtRemoteObjects yet but some things you should do:

Check the return value of connectToNode
Connect the error signal to at least print something if it's called
Check lastError if the connection failed