Run Android Intent from Qt (#Android #application #Qt #Launcher)

runIntent.cpp

void runApplication(const QString &packageName, const QString &className)
{
    qDebug() << "Start app: " <<packageName <<", "<<className;
    QAndroidJniObject activity = QAndroidJniObject::callStaticObjectMethod(
                "org/qtproject/qt5/android/QtNative", "activity",
                "()Landroid/app/Activity;");   //activity is valid

    if ( activity.isValid() )
    {
        // Equivalent to Jave code: 'Intent intent = new Intent();'
        QAndroidJniObject intent("android/content/Intent","()V");

        if ( intent.isValid() )
        {
            QAndroidJniObject jPackageName = QAndroidJniObject::fromString(packageName);
            QAndroidJniObject jClassName = QAndroidJniObject::fromString(className);

            if ( jPackageName.isValid() && jClassName.isValid() )
            {
                // Equivalent to Jave code: 'intent.setClassName("com.android.settings", "com.android.settings.DevelopmentSettings");'
                intent.callObjectMethod("setClassName",
                                        "(Ljava/lang/String;Ljava/lang/String;)Landroid/content/Intent;",
                                        jPackageName.object<jstring>(),jClassName.object<jstring>());

                jint flag = QAndroidJniObject::getStaticField<jint>(
                            "android/content/Intent",
                            "FLAG_ACTIVITY_NEW_TASK");

                intent.callObjectMethod("setFlags", "(I)V",flag);

                // Equivalent to Jave code: 'startActivity(intent);'
                QAndroidJniEnvironment env;
                activity.callObjectMethod(
                            "startActivity",
                            "(Landroid/content/Intent;)V",
                            intent.object<jobject>());
                if (env->ExceptionCheck()) {
                    qDebug() << "Intent not found!";
                    env->ExceptionClear(); // TODO: stupid method! Remove this!
                }
            } else {
                qDebug() << "Action is not valid";
            }
        } else {
            qDebug() << "Intent is not valid";
        }
    } else {
        qDebug() << "Activity is not valid";
    }
}

Hi, could you please upload an example project or similar? How can I use this function?

Thanks a lot.

For those that are getting
JNI DETECTED ERROR IN APPLICATION: the return type of CallObjectMethodV does not match void android.app.Activity.startActivity(android.content.Intent)

You should use
activity.callMethod<void>("startActivity","(Landroid/content/Intent;)V", intent.object<jobject>());

Instead of
activity.callObjectMethod("startActivity","(Landroid/content/Intent;)V",intent.object<jobject>());

Starting from Android 5.x as filled in this QTBUG -> https://bugreports.qt.io/browse/QTBUG-48631

Hi, i am trying to Intent a Qt app from another Qt app (qt+android both) and always recieving "intent not found" :-(

What can i do?

Here a part of the manifest

    <activity android:configChanges="orientation|uiMode|screenLayout|screenSize|smallestScreenSize|layoutDirection|locale|fontScale|keyboard|keyboardHidden|navigation|mcc|mnc|density" android:name="org.qtproject.qt5.android.bindings.QtActivity" android:label="Devolucion" android:screenOrientation="landscape" android:launchMode="singleTop">
        <intent-filter>
            <action android:name="android.intent.action.MAIN"/>
            <category android:name="android.intent.category.LAUNCHER"/>
        <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>