How to process an NFC tag in a running Activity?

Question

NFC

Good day.
I am writing a program to read / write data to the controller via NFC. There was an unexpected problem in usability: if several programs for working with NFC are installed on the smartphone, the OS each time prompts me to choose which one to use, even if my program is already running. If you choose mine, it correctly works either onCreate or onNewIntent (depending on whether it was launched or not).
How can an android explain that if the application is already running, it is not necessary to re-offer a choice of programs for working with the label?
I write in Java in Android Studio under Android 6.
Manifest file:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="aaa.nfctest">
    <uses-sdk android:minSdkVersion="10"/>
    <uses-permission android:name="android.permission.NFC"/>
    <uses-feature
        android:name="android.hardware.nfc"
        android:required="true"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity
            android:name=".MainActivity"
            android:launchMode="standard">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
        <activity android:name=".nfc" android:launchMode="singleTask">
            <intent-filter>
                <action android:name="android.nfc.action.TECH_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>
        <meta-data
            android:name="com.google.android.gms.version"
            android:value="@integer/google_play_services_version"/>
    </application>
</manifest>