NFC Reader And Writer using Android devices

NFC Reader And Writer using Android devices

Fudi NFC

NFC Reader And Writer using Android devices by Romell Domínguez.

Add the following in your app's build.gradle file:

repositories {
dependencies {
    implementation 'com.romellfudi.fudinfc:fudi-nfc:${latestVersion}'

Add the following to your AndroidManifest.xml file :

<uses-permission android:name="android.permission.NFC" />

Now go to the created activity, and either

  • Implement [FGD] yourself
// write email
OpCallback { it.writeEmailToTagFromIntent(text, null, null, intent) }

// write sms
OpCallback { it.writeSmsToTagFromIntent(text, null, intent) }

// write geolocation - latitude & longitude
OpCallback { it.writeGeolocationToTagFromIntent(latitude, longitude, intent) } 

// write uri
OpCallback { it.writeUriToTagFromIntent(text, intent) }

// write phone contact
OpCallback { it.writeTelToTagFromIntent(text, intent) }

// write rolling-on bluetooth device
OpCallback { it.writeBluetoothAddressToTagFromIntent(text, intent) }


Paste this in the activity if you're extending our class :

override fun onNewIntent(Intent intent) {
    for (String message in getNfcMessages()) { 
        // message 
  • Otherwise :
override fun onNewIntent(intent: Intent?) {
    val items: SparseArray<String> = NfcReadUtilityImpl().readFromTagWithSparseArray(intent)
    for (i in 0 until items.size()) {
        // items.valueAt(i) 
  • If you like the Map implementation more you might as well use :
override fun onNewIntent(intent: Intent?) {
    for (message in NfcReadUtilityImpl().readFromTagWithMap(intent).values()) {
        // message
  • Now you're able to read the NFC Tags as long as the library supports the data in it when held to your phone!

Write to a tag

  • Let your activity implement TaskCallback:
fun onReturn(result: Boolean) {
    val message = if (result) "Success" else "Failed!"
    Toast.makeText(this, message, Toast.LENGTH_SHORT).show()

fun onProgressUpdate(vararg booleans: Boolean) {
    Toast.makeText(this, if (booleans[0]) "We started writing" else "We could not write!", Toast.LENGTH_SHORT).show()

fun onError(e: Exception) {
    Toast.makeText(this, e.message, Toast.LENGTH_SHORT).show()
  • If you hold a tag against the phone and it is NFC Enabled, your implementation of the methods will be executed.