Android notification

EndrII 0

Hi
I want to add notifications to my application written to qml.

I studied the example and created the same for myself, the application is successfully compiled, but when I try to show the notification it falls.

Here is the console output:

E/MediaPlayer(24986): Should have subtitle controller already set
F/art     (24986): art/runtime/check_jni.cc:70] JNI DETECTED ERROR IN APPLICATION: JNI GetMethodID called with pending exception 'java.lang.NullPointerException' thrown in unknown throw location
F/art     (24986): art/runtime/check_jni.cc:70]     in call to GetMethodID
F/art     (24986): art/runtime/check_jni.cc:70]     from void org.qtproject.qt5.android.QtNative.startQtApplication()
F/art     (24986): art/runtime/check_jni.cc:70] "qtMainLoopThread" prio=5 tid=18 Runnable
F/art     (24986): art/runtime/check_jni.cc:70]   | group="main" sCount=0 dsCount=0 obj=0x12e5d460 self=0xf46bac00
F/art     (24986): art/runtime/check_jni.cc:70]   | sysTid=25015 nice=0 cgrp=default sched=0/0 handle=0xf3012000
F/art     (24986): art/runtime/check_jni.cc:70]   | state=R schedstat=( 1749781057 405706930 1629 ) utm=164 stm=10 core=0 HZ=100
F/art     (24986): art/runtime/check_jni.cc:70]   | stack=0xe0afe000-0xe0b00000 stackSize=1036KB
F/art     (24986): art/runtime/check_jni.cc:70]   | held mutexes= "mutator lock"(shared held)
F/art     (24986): art/runtime/check_jni.cc:70]   at org.qtproject.qt5.android.QtNative.startQtApplication(Native method)
F/art     (24986): art/runtime/check_jni.cc:70]   at org.qtproject.qt5.android.QtNative$6.run(QtNative.java:359)
F/art     (24986): art/runtime/check_jni.cc:70]   at org.qtproject.qt5.android.QtThread$1.run(QtThread.java:61)
F/art     (24986): art/runtime/check_jni.cc:70]   at java.lang.Thread.run(Thread.java:818)
F/art     (24986): art/runtime/check_jni.cc:70]
W/InputMethodManagerService(  860): Starting input on non-focused client com.android.internal.view.IInputMethodClient$Stub$Proxy@2a70763 (uid=10136 pid=24986)
W/InputMethodManager(24986): startInputInner : InputBindResult == null
F/libc    (24986): Fatal signal 6 (SIGABRT), code -6 in tid 25015 (qtMainLoopThrea)
I/AEE/AED (25314): check process 24986 name:sarapp.sounband
I/AEE/AED (25314): tid 25015 abort msg address is:0xdc1c5000, si_code is:-6 (request from 24986:10136)
I/AEE/AED (25314): BOOM: pid=24986 uid=10136 gid=10136 tid=25015
I/ActivityManager(  860): Process org.quasarapp.sounband (pid 24986) has died
I/SurfaceFlinger(  302): EventThread Client Pid (24986) disconnected by (302)
I/SurfaceFlinger(  302): EventThread Client Pid (24986) disconnected by (302)
W/ADB_SERVICES(20741): terminating JDWP 24986 connection: Try again
I/Zygote  (  363): Process 24986 exited due to signal (6)

java code:

package org.quasarapp.sounband;

import android.app.Notification;
import android.app.NotificationManager;
import android.content.Context;

public class NotificationClient extends org.qtproject.qt5.android.bindings.QtActivity
{
    private static NotificationManager m_notificationManager;
    private static Notification.Builder m_builder;
    private static NotificationClient m_instance;

    public NotificationClient()
    {
        m_instance = this;
    }

    public static void notify(String s)
    {

        if (m_notificationManager == null) {
            m_notificationManager = (NotificationManager)m_instance.getSystemService(Context.NOTIFICATION_SERVICE);
            m_builder = new Notification.Builder(m_instance);
            m_builder.setSmallIcon(R.drawable.icon);
            m_builder.setContentTitle("A message from SoundBand!");
        }

        m_builder.setContentText(s);
        m_notificationManager.notify(1, m_builder.build());
    }
}

c++ header code


#ifndef ANDROIDPLAYER_H
#define ANDROIDPLAYER_H

#include <QObject>
#ifdef Q_OS_ANDROID

class AndroidPlayer : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QString notification READ notification WRITE setNotification NOTIFY notificationChanged)

private:
    QString m_notification;

private slots:
    void updateAndroidNotification();

public:
    explicit AndroidPlayer(QObject *parent = nullptr);

QString notification() const;

public slots:
    void setNotification(QString notification);

signals:
    void notificationChanged();
};

#endif // OS_ANDROID

#endif // ANDROIDPLAYER_H

c++ source code

#include "androidplayer.h"
#ifdef Q_OS_ANDROID

#include <QAndroidJniObject>

AndroidPlayer::AndroidPlayer(QObject *parent)
    : QObject(parent) {

    connect(this, SIGNAL(notificationChanged()),
            this, SLOT(updateAndroidNotification()));
}

QString AndroidPlayer::notification() const {
    return m_notification;
}

void AndroidPlayer::setNotification(QString notification) {
    if (m_notification == notification)
        return;

    m_notification = notification;
    emit notificationChanged();
}

void AndroidPlayer::updateAndroidNotification() {
    QAndroidJniObject javaNotification = QAndroidJniObject::fromString(m_notification);
    QAndroidJniObject::callStaticMethod<void>("org.quasarapp.sounband.NotificationClient",
                                       "notify",
                                       "(Ljava/lang/String;)V",
                                       javaNotification.object<jstring>());
}

#endif

adddeeee

Hi!

I'm having the exact same problem. Did you solve this?

KroMignon

@EndrII-0 I don't know if it will change anything, but I would do it like this, to ensure it will run on main thread:

void AndroidPlayer::setNotification(QString notification) {
    if (m_notification == notification)
        return;

    m_notification = notification;
    QtAndroid::runOnAndroidThread([notification] {
        auto javaString = QAndroidJniObject::fromString(notification);
        QAndroidJniObject::callStaticMethod<void>("org.quasarapp.sounband.NotificationClient",
                                           "notify",
                                           "(Ljava/lang/String;)V",
                                           javaString.object());        
    });
}

Or if you only want to show a toast notification:

void AndroidPlayer::showToast(const QString &message, bool shortTime)
{
    const int duration(shortTime ? 0 : 1);
    QtAndroid::runOnAndroidThread([message, duration] {
        auto javaString = QAndroidJniObject::fromString(message);
        auto toast = QAndroidJniObject::callStaticObjectMethod(
                    "android/widget/Toast",
                    "makeText",
                    "(Landroid/content/Context;Ljava/lang/CharSequence;I)Landroid/widget/Toast;",
                    QtAndroid::androidActivity().object(),
                    javaString.object(),
                    jint(duration)
                    );
        toast.callMethod<void>("show");
    });

}

KroMignon

@adddeeee @EndrII-0 , there is an open source (MIT licence) on github which could help you to solve your problem.
Take a look at QtAndroidTools

adddeeee

Thanks! I think I have that code implemented.

I'm starting to think something's wrong with where I place the icon itself.

Where do you place the icon?

KroMignon

@adddeeee I never used Notification on Android, so I can't reply to your question.
I don't think you are using same code a QtAndroidTools, because there is a C++ wrapper around all Android/JNI stuff which seems to made it quiet simple to use.. Take a look at the documentation: https://falsinsoft.github.io/QtAndroidTools/Documentation/#Notification

adddeeee

@KroMignon said in Android notification:

@adddeeee I never used Notification on Android, so I can't reply to your question.
I don't think you are using same code a QtAndroidTools, because there is a C++ wrapper around all Android/JNI stuff which seems to made it quiet simple to use.. Take a look at the documentation:

No, that's true. I'm using the same code as in the Qt Notifier example.

Please have a look in this thread where I'm posting my code:

https://forum.qt.io/topic/103921/android-notification-not-shown/7

Important: Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

Android notification