NFC Problem on android

mhusari

Hello,

I have a problem with NFC on android, QNearFieldManager seems to work ok but I do not get the signals. I suspect that the problem is within android and/or AndroidManifest.xml since rest of the code is very simple. Please advice :)

Here is relevant part of main.cpp

#include "mynfc.h"

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

    qmlRegisterType<MyNFC>("omat.kirjastot.nfc", 1, 0, "MyNFC");

    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

    return app.exec();
}

Here is the code from my constructor that initiates the manager and connects the signals:

MyNFC::MyNFC(QObject *parent) : QObject(parent)
{
    manager = new QNearFieldManager(this);

// Both of these return "true"
    qDebug() << "manager->isAvailable(); == " << manager->isAvailable();
    qDebug() << "manager->startTargetDetection(); == " << manager->startTargetDetection();

// These signals I am waiting for, but they never fire
    connect(manager, SIGNAL(targetDetected(QNearFieldTarget*)),
            this, SLOT(targetDetected(QNearFieldTarget*)));
    connect(manager, SIGNAL(targetLost(QNearFieldTarget*)),
            this, SLOT(targetLost(QNearFieldTarget*)));

}

Here are the slots for those signals:

void MyNFC::targetDetected(QNearFieldTarget *target)
{
    qDebug() << "tag found....";

    if (!target)
        return;
}

void MyNFC::targetLost(QNearFieldTarget *target)
{
    if (target)
        target->deleteLater();

    qDebug() << "tag lost....";
}

Here is some of what I have in AndroidManifest.xml

    <uses-feature android:name="android.hardware.nfc" android:required="true"/>
    <uses-permission android:name="android.permission.NFC"/>
    <uses-sdk android:minSdkVersion="16" android:targetSdkVersion="16"/>
    <application android:hardwareAccelerated="true" android:name="org.qtproject.qt5.android.bindings.QtApplication" android:label="-- %%INSERT_APP_NAME%% --">
        <activity android:configChanges="orientation|uiMode|screenLayout|screenSize|smallestScreenSize|layoutDirection|locale|fontScale|keyboard|keyboardHidden|navigation" android:name="org.qtproject.qt5.android.bindings.QtActivity" android:label="-- %%INSERT_APP_NAME%% --" android:screenOrientation="landscape" android:launchMode="singleTop">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
    </application>

Should I post all xml file contents?

I suppose "intent-filter" is unnecessary for my app as I do not want my app to start on read event. I just want to react to nfc/tag-discovery while app is "focused".

tag that I am trying to read is read fine on another android app, it reports these values:

Type: ISO 14443-3A
Serial number: 20:71:E5:16
Technologies available: NfcA
Memory information: 1 kBytes

So, the question is: "What happens to the signals, why don't they fire?"