simplified NFC reading

app/src/main/AndroidManifest.xml

@@ -21,17 +21,9 @@
 
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
-
-                <action android:name="android.nfc.action.TECH_DISCOVERED" />
-                <action android:name="android.nfc.action.TAG_DISCOVERED" />
-
-                <category android:name="android.intent.category.DEFAULT" />
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
 
-            <meta-data android:name="android.nfc.action.TECH_DISCOVERED"
-                android:resource="@xml/nfc_tech_filter" />
-
         </activity>
     </application>
 

app/src/main/java/com/example/palto/MainActivity.kt

@@ -5,6 +5,9 @@ import android.content.Intent
 import android.content.IntentFilter
 import android.nfc.NfcAdapter
 import android.nfc.Tag
+import android.nfc.tech.IsoDep
+import android.nfc.tech.NdefFormatable
+import android.nfc.tech.NfcA
 import android.os.Build
 import android.os.Bundle
 import android.util.Log
@@ -32,70 +35,28 @@ class MainActivity : AppCompatActivity() {
         if (!(this.nfcAdapter!!.isEnabled)) {
             Log.w("NFC", "NFC is not enabled")
         }
-
-        // check if the application was started by an intent
-        if (this.intent != null) this.processIntent(intent)
     }
 
     override fun onResume() {
         super.onResume()
 
-        val intent = Intent(
+        nfcAdapter!!.enableReaderMode(
             this,
-            this::class.java
+            this::processTag,
+            NfcAdapter.FLAG_READER_NFC_A or NfcAdapter.FLAG_READER_SKIP_NDEF_CHECK,
+            null
         )
-        intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING)
-
-        val pendingIntent = PendingIntent.getActivity(this, 0, intent, 0)
-        val intentFilter = arrayOf<IntentFilter>()
-
-        // enable the NFC discovery
-        nfcAdapter?.enableForegroundDispatch(this, pendingIntent, intentFilter, null)
     }
 
     override fun onPause() {
         super.onPause()
 
         // disable the NFC discovery
-        this.nfcAdapter!!.disableForegroundDispatch(this)
+        this.nfcAdapter!!.disableReaderMode(this)
     }
 
-    override fun onNewIntent(intent: Intent?) {
-        super.onNewIntent(intent)
-
-        // check the new intent
-        if (intent != null) {
-            this.processIntent(intent)
-        }
-    }
-
-    private fun processIntent(intent: Intent) {
-        Log.d("NFC", "New : ${intent.action}")
-
-        var text: TextView = this.findViewById(R.id.test_text)
-        text.text = intent.action
-
-        if (intent.action == NfcAdapter.ACTION_TAG_DISCOVERED) {
-            val tag: Tag? = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
-                intent.getParcelableExtra(NfcAdapter.EXTRA_TAG, Tag::class.java)
-            } else {
-                intent.getParcelableExtra(NfcAdapter.EXTRA_TAG)
-            }
-
-            Log.d("NFC", "Tag : ${tag?.id.contentToString()}")
-        }
-
-        if (intent.action == NfcAdapter.ACTION_TECH_DISCOVERED) {  // TODO(Faraphel): switch ?
-
-            val tag: Tag? = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
-                intent.getParcelableExtra(NfcAdapter.EXTRA_TAG, Tag::class.java)
-            } else {
-                intent.getParcelableExtra(NfcAdapter.EXTRA_TAG)
-            }
-
-            Log.d("NFC", "Tag : $tag")
-
-        }
-
+    @OptIn(ExperimentalStdlibApi::class)
+    fun processTag(tag: Tag) {
+        Log.d("NFC", "Tag ID : ${tag.id.toHexString()}")
     }
 }

app/src/main/res/xml/nfc_tech_filter.xml

@@ -1,7 +0,0 @@
-<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
-    <tech-list>
-        <tech>android.nfc.tech.IsoDep</tech>
-        <tech>android.nfc.tech.NfcA</tech>
-        <tech>android.nfc.tech.NdefFormatable</tech>
-    </tech-list>
-</resources>