How to read URL in NFC in android

Question

I used this code for integrating NFC reading in my android application. Write a plain text to the NFC tag and read using app it is perfectly working. Now my requirement is to read URL from the NFC tag.When reading value from NFC tag it automatically open the browser and loading the URL.So what changes needed to achieve the reading content and open my app?

score 1 · Accepted Answer · answered Mar 24 '15 at 04:24

1

Add to your Manifest

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

            <data
                android:host="your host name"
                android:scheme="http" />

            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>

in the activity you want to open

answered Mar 24 '15 at 04:24

user3458049

70
6

can you please clarify me how to add the hostname? – Rosemary Feb 01 '19 at 06:25

score 0 · Answer 2 · answered Mar 23 '15 at 08:56

Here I assume that results returned will be only url and no other data with it, so just modify onPostExecute as :

@Override
protected void onPostExecute(String result) {
    if (result != null) {
        String url = result;
        Intent i = new Intent(Intent.ACTION_VIEW);
        i.setData(Uri.parse(url));
        startActivity(i);
    }
}

If other data also included than parse results to get only URL.

score 0 · Answer 3 · answered Mar 26 '15 at 16:10

You can use filter if you want to start the app when get closer to NFC tag, but be aware if your app is running it won't be notified about the tag. You have to register it inside your app:

protected void onCreate(Bundle savedInstanceState) {
    ...
    Intent nfcIntent = new Intent(this, getClass());
    nfcIntent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);

    nfcPendingIntent =
            PendingIntent.getActivity(this, 0, nfcIntent, 0);

    IntentFilter tagIntentFilter =
            new IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED);
    try {
        tagIntentFilter.addDataType("text/plain");
        intentFiltersArray = new IntentFilter[]{tagIntentFilter};
    }
    catch (Throwable t) {
        t.printStackTrace();
    }
}

and remember to enable it in onResume:

nfcAdpt.enableForegroundDispatch(
            this,
            nfcPendingIntent,
            intentFiltersArray,
            null);
    handleIntent(getIntent());

and unregister it in onPause:

nfcAdpt.disableForegroundDispatch(this);

..be aware that the data can be stored in SmartPoster structure in your NFC tag. In this case you have to read it in another way. In my blog you can find a post about reading SmartPoster and more

How to read URL in NFC in android

3 Answers3