My NFC Scan application starts only if NFC Type 2

Question

I've made an NFC application who can reads NFC tag. It works well. (With all types)

But since yesterday i'm trying to start automatically my app once a NFC tag is maintained against my device.

So i've updated my Manifest :

        <activity android:name=".MainActivity" android:screenOrientation="portrait" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
            <intent-filter>
                <action android:name="android.nfc.action.NDEF_DISCOVERED" />
                <category android:name="android.intent.category.DEFAULT" />
                <data android:scheme="http" />
                <data android:scheme="https" />
            </intent-filter>


            <intent-filter>
                <action android:name="android.nfc.action.TECH_DISCOVERED"/>
            </intent-filter>

            <meta-data android:name="android.nfc.action.TECH_DISCOVERED"
                android:resource="@xml/nfc_tech_filter" />
        </activity>

Then, here is my nfc_tech_filter.xml

<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
    <tech-list>
        <tech>android.nfc.tech.IsoDep</tech>
        <tech>android.nfc.tech.NfcA</tech>
        <tech>android.nfc.tech.NfcB</tech>
        <tech>android.nfc.tech.NfcF</tech>
        <tech>android.nfc.tech.NfcV</tech>
        <tech>android.nfc.tech.Ndef</tech>
        <tech>android.nfc.tech.NdefFormatable</tech>
        <tech>android.nfc.tech.MifareClassic</tech>
        <tech>android.nfc.tech.MifareUltralight</tech>
    </tech-list>
</resources>

And surprise, it works only when I hold a NFC Type 2 against my device. I've try with my appartement key (Mifare Classic) and my bank card (IsoDep), and it doesn't launch my app... I specify that it works when my app is already started.

Any idea?

EDIT :

This is my Manifest right now :

        <activity android:name=".MainActivity" android:screenOrientation="portrait" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
            <intent-filter>
                <action android:name="android.nfc.action.NDEF_DISCOVERED" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
            <intent-filter>
                <action android:name="android.nfc.action.TECH_DISCOVERED" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
            <intent-filter>
                <action android:name="android.nfc.action.TAG_DISCOVERED" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
            <meta-data android:name="android.nfc.action.TECH_DISCOVERED" android:resource="@xml/nfc_tech_filter" />
        </activity>

Now, when I pass my bank card, it opens the application but doesn't display any result.

Parcelable[] rawMessages =
                    intent.getParcelableArrayExtra(NfcAdapter.EXTRA_TAG);

rawMessages variable is NULL after that. Same if I put NfcAdapter.EXTRA_NDEF_MESSAGES

Answer 1

ACTION_TAG_DISCOVERED:

This intent is started if no activities handle the ACTION_NDEF_DISCOVERED or ACTION_TECH_DISCOVERED intents.

https://developer.android.com/guide/topics/connectivity/nfc/nfc

You get this Intent when no others has captured it, so there is something wrong in your setup.

You can capture it explicitly like:

<intent-filter>
    <action android:name="android.nfc.action.TAG_DISCOVERED"/>
</intent-filter>