Оставайтесь в текущей активности после приема NFC

У меня есть приложение, которое работает нормально и отлично передает данные через NFC. У меня есть основное действие, действие по передаче данных и другое действие по получению данных.

Действия отправителя работают отлично, но когда получатель получает намерение NFC, он перезапускает приложение обратно к основному действию.

Я не совсем уверен, почему это так. Я бы хотел, чтобы он отклонял любые нажатия, если пользователь уже не участвует в этом действии, и, если они есть, оставаться в этом действии и обрабатывать намерение NFC.

Вот манифест:

<activity android:name=".MainActivity">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>
<activity android:name=".Timer" />
<activity android:name=".AddSlaves"
          android:label="Add Slave Devices"
          android:launchMode="singleTask">
    <intent-filter>
        <action android:name="android.nfc.action.NDEF_DISCOVERED" />
        <category android:name="android.intent.category.DEFAULT" />
        <data android:mimeType="text/plain" />
    </intent-filter>
</activity>
<activity android:name=".JoinSrv"
          android:launchMode="singleTask">
    <intent-filter>
        <action android:name="android.nfc.action.NDEF_DISCOVERED" />
        <category android:name="android.intent.category.DEFAULT"/>
        <data android:mimeType="text/plain" />
    </intent-filter>
</activity>

Вот класс отправителя:

public class JoinSrv extends Activity implements NfcAdapter.OnNdefPushCompleteCallback, NfcAdapter.CreateNdefMessageCallback {
    //The array lists to hold our messages
    private ArrayList<String> messagesToSendArray = new ArrayList<>();
    private ArrayList<String> messagesReceivedArray = new ArrayList<>();

    //Text boxes to add and display our messages
    private NfcAdapter mNfcAdapter;

    //Save our Array Lists of Messages for if the user navigates away
    @Override
    public void onSaveInstanceState(@NonNull Bundle savedInstanceState) {
        super.onSaveInstanceState(savedInstanceState);
        savedInstanceState.putStringArrayList("messagesToSend", messagesToSendArray);
        savedInstanceState.putStringArrayList("lastMessagesReceived", messagesReceivedArray);
    }

    //Load our Array Lists of Messages for when the user navigates back
    @Override
    public void onRestoreInstanceState(@NonNull Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        messagesToSendArray = savedInstanceState.getStringArrayList("messagesToSend");
        messagesReceivedArray = savedInstanceState.getStringArrayList("lastMessagesReceived");
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_join_srv);


        //Check if NFC is available on device
        mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
        if (mNfcAdapter != null) {
            //Handle some NFC initialization here
        } else {
            Toast.makeText(this, "NFC not available on this device",
                    Toast.LENGTH_SHORT).show();
        }

        //Check if NFC is available on device
        mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
        if (mNfcAdapter != null) {
            //This will refer back to createNdefMessage for what it will send
            mNfcAdapter.setNdefPushMessageCallback(this, this);

            //This will be called if the message is sent successfully
            mNfcAdapter.setOnNdefPushCompleteCallback(this, this);
        }
    }

    @Override
    public NdefMessage createNdefMessage(NfcEvent event) {
        //This will be called when another NFC capable device is detected.
        //We'll write the createRecords() method in just a moment
        NdefRecord[] recordsToAttach = createRecords();
        //When creating an NdefMessage we need to provide an NdefRecord[]
        return new NdefMessage(recordsToAttach);
    }

    @Override
    public void onNdefPushComplete(NfcEvent event) {
        //This is called when the system detects that our NdefMessage was
        //Successfully sent.
        messagesToSendArray.clear();
    }

    public NdefRecord[] createRecords() {
        NdefRecord[] records = new NdefRecord[1];
        //To Create Messages Manually if API is less than
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {

            byte[] payload = "192.168.1.100".
                    getBytes(Charset.forName("UTF-8"));
            NdefRecord record = new NdefRecord(
                    NdefRecord.TNF_WELL_KNOWN,      //Our 3-bit Type name format
                    NdefRecord.RTD_TEXT,            //Description of our payload
                    new byte[0],                    //The optional id for our Record
                    payload);                       //Our payload for the Record

            records[1] = record;

        }
        //Api is high enough that we can use createMime, which is preferred.
        else {

                byte[] payload = "192.168.1.100".
                        getBytes(Charset.forName("UTF-8"));

                NdefRecord record = NdefRecord.createMime("text/plain",payload);
                records[1] = record;

        }
        records[messagesToSendArray.size()] =
                NdefRecord.createApplicationRecord(getPackageName());
        return records;
    }

    private void handleNfcIntent(Intent NfcIntent) {
        if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(NfcIntent.getAction())) {
            Parcelable[] receivedArray =
                    NfcIntent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);

            if (receivedArray != null) {
                messagesReceivedArray.clear();
                NdefMessage receivedMessage = (NdefMessage) receivedArray[0];
                NdefRecord[] attachedRecords = receivedMessage.getRecords();

                for (NdefRecord record : attachedRecords) {
                    String string = new String(record.getPayload());
                    //Make sure we don't pass along our AAR (Android Application Record)
                    if (string.equals(getPackageName())) {
                        continue;
                    }
                    messagesReceivedArray.add(string);
                }
                Toast.makeText(this, "Received " + messagesReceivedArray.size() +
                        " Messages", Toast.LENGTH_LONG).show();
            } else {
                Toast.makeText(this, "Received Blank Parcel", Toast.LENGTH_LONG).show();
            }
        }
    }

    @Override
    public void onNewIntent(Intent intent) {
        handleNfcIntent(intent);
    }

    @Override
    public void onResume() {
        super.onResume();
        handleNfcIntent(getIntent());
    }
}

Вот класс приемника:

public class AddSlaves extends Activity implements NfcAdapter.OnNdefPushCompleteCallback, NfcAdapter.CreateNdefMessageCallback{
    //The array lists to hold our messages
    private ArrayList<String> messagesToSendArray = new ArrayList<>();
    private ArrayList<String> messagesReceivedArray = new ArrayList<>();

    //Text boxes to add and display our messages
    private EditText txtBoxAddMessage;
    private TextView txtReceivedMessages;
    private TextView txtMessagesToSend;
    private NfcAdapter mNfcAdapter;

    private  void updateTextViews() {
        txtReceivedMessages.setText("Messages Received:\n");
        //Populate our list of messages we have received
        if (messagesReceivedArray.size() > 0) {
            for (int i = 0; i < messagesReceivedArray.size(); i++) {
                txtReceivedMessages.append(messagesReceivedArray.get(i));
                txtReceivedMessages.append("\n");
            }
        }
    }

    //Save our Array Lists of Messages for if the user navigates away
    @Override
    public void onSaveInstanceState(@NonNull Bundle savedInstanceState) {
        super.onSaveInstanceState(savedInstanceState);
        savedInstanceState.putStringArrayList("lastMessagesReceived",messagesReceivedArray);
    }

    //Load our Array Lists of Messages for when the user navigates back
    @Override
    public void onRestoreInstanceState(@NonNull Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        messagesReceivedArray = savedInstanceState.getStringArrayList("lastMessagesReceived");
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_add_slaves);

        txtReceivedMessages = (TextView) findViewById(R.id.txtMessagesReceived);
        Button btnAddMessage = (Button) findViewById(R.id.buttonAddMessage);


        //Check if NFC is available on device
        mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
        if(mNfcAdapter != null) {
            //Handle some NFC initialization here
        }
        else {
            Toast.makeText(this, "NFC not available on this device",
                    Toast.LENGTH_SHORT).show();
        }

        //Check if NFC is available on device
        mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
        if(mNfcAdapter != null) {
            //This will refer back to createNdefMessage for what it will send
            mNfcAdapter.setNdefPushMessageCallback(this, this);

            //This will be called if the message is sent successfully
            mNfcAdapter.setOnNdefPushCompleteCallback(this, this);
        }
    }

    @Override
    public NdefMessage createNdefMessage(NfcEvent event) {
        //This will be called when another NFC capable device is detected.
        return null;

    }

    @Override
    public void onNdefPushComplete(NfcEvent event) {
        //This is called when the system detects that our NdefMessage was
        //Successfully sent.
        messagesToSendArray.clear();
    }


    private void handleNfcIntent(Intent NfcIntent) {
        if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(NfcIntent.getAction())) {
            Parcelable[] receivedArray =
                    NfcIntent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);

            if(receivedArray != null) {
                messagesReceivedArray.clear();
                NdefMessage receivedMessage = (NdefMessage) receivedArray[0];
                NdefRecord[] attachedRecords = receivedMessage.getRecords();

                for (NdefRecord record:attachedRecords) {
                    String string = new String(record.getPayload());
                    //Make sure we don't pass along our AAR (Android Application Record)
                    if (string.equals(getPackageName())) { continue; }
                    messagesReceivedArray.add(string);
                }
                Toast.makeText(this, "Received " + messagesReceivedArray.size() +
                        " Messages", Toast.LENGTH_LONG).show();
                updateTextViews();
            }
            else {
                Toast.makeText(this, "Received Blank Parcel", Toast.LENGTH_LONG).show();
            }
        }
    }


    @Override
    public void onNewIntent(Intent intent) {
        handleNfcIntent(intent);
    }

    @Override
    public void onResume() {
        super.onResume();
        updateTextViews();
        handleNfcIntent(getIntent());
    }
}