Java – Android NFC device owner configuration: send custom attributes Is it possible?

I am developing an application and have the following problems

When using NFC for device owner configuration, I want to send a string that will be used by the new device owner application

I know the standard mime attribute configured by the device owner and found here

This is a clip that can give you a better understanding of my problem Note the "mycustomvalue" attribute

Properties properties = new Properties();
properties.put("myCustomValue",value);
properties.put(DevicePolicyManager.EXTRA_PROVISIONING_DEVICE_ADMIN_PACKAGE_NAME,"com.example.some.app");
try {                    
    properties.store(stream,"NFC Provisioning");            
    ndefMessage = new NdefMessage(new NdefRecord[{NdefRecord.createMime(DevicePolicyManager.MIME_TYPE_PROVISIONING_NFC,stream.toByteArray())});
} catch (IOException e) {                         

}

This clip is inside

public NdefMessage createNdefMessage(NfcEvent event)

You can find a template here

If possible, I also want to know how to retrieve the string value immediately after the configured application starts

Solution

The following code should be what you are looking for For brevity, I only set the package name plus two strings to be sent to deviceadminreceiver

@Override
public NdefMessage createNdefMessage(NfcEvent event) {
    try {
        Properties p = new Properties();

        p.setProperty(
                DevicePolicyManager.EXTRA_PROVISIONING_DEVICE_ADMIN_PACKAGE_NAME,"com.example.some.app");

        Properties extras = new Properties();
        extras.setProperty("Key1","TestString1");
        extras.setProperty("Key2","TestString2");
        StringWriter sw = new StringWriter();
        try{
            extras.store(sw,"admin extras bundle");
            p.put(DevicePolicyManager.EXTRA_PROVISIONING_ADMIN_EXTRAS_BUNDLE,sw.toString());
            Log.d(TAG,"Admin extras bundle=" + p.get(
                    DevicePolicyManager.EXTRA_PROVISIONING_ADMIN_EXTRAS_BUNDLE));
        } catch (IOException e) {
            Log.e(TAG,"Unable to build admin extras bundle");
        }

        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        OutputStream out = new ObjectOutputStream(bos);
        p.store(out,"");
        final byte[] bytes = bos.toByteArray();

        NdefMessage msg = new NdefMessage(NdefRecord.createMime(
                DevicePolicyManager.MIME_TYPE_PROVISIONING_NFC,bytes));
        return msg;
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

The next fragment will enter your deviceadminreceiver to receive "admin extras"... If you do not overwrite onReceive, you need to overwrite onprofileprovisioningcomplete and process extras in it_ PROVISIONING_ ADMIN_ EXTRAS_ BUNDLE.

@Override
public void onReceive(Context context,Intent intent) {
    Log.d(TAG,"onReceive " + intent.getAction());
    if (ACTION_PROFILE_PROVISIONING_COMPLETE.equals(intent.getAction())) {
        PersistableBundle extras = intent.getParcelableExtra(
                EXTRA_PROVISIONING_ADMIN_EXTRAS_BUNDLE);
        Log.d(TAG,"onReceive Extras:" + extras.getString("Key1") + " / "  + extras.getString("Key2"));
    }
}