How to start a second activity in Android

[mrdebug]

My, my class called NFCInterface does not starts as activity when my app starts.
I have added these lines in the AndroidManifest.xml file but the lines don't be considered. What it is wrong?

    <activity android:name="it.labcsp.handyman.handymantouch.NFCInterface" >
        <intent-filter>
            <action android:name="android.nfc.action.TAG_DISCOVERED"/>
            <category android:name="android.intent.category.DEFAULT"/>
        </intent-filter>
    </activity>

[Gojir4]

@mrdebug Hi,

Does your NFCInterface class inherits from QtActivity ?

[mrdebug]

It works but only one time.
After the first ufc event the app goes to freeze here

    @Override
    protected void onResume() {
        super.onResume();