From 5b458624745c7ea80d1e63c9a6ef77075763ff5f Mon Sep 17 00:00:00 2001
From: Adam Soltys <adam@coinos.io>
Date: Thu, 10 Jul 2025 12:36:50 -0700
Subject: user onboarding

---
 .../app/src/main/java/io/coinos/MainActivity.java  |  5 ++
 .../java/io/coinos/nfcwriter/NfcWriterPlugin.java  | 62 ++++++++++++++++++++++
 2 files changed, 67 insertions(+)
 create mode 100644 android/app/src/main/java/io/coinos/nfcwriter/NfcWriterPlugin.java

(limited to 'android/app/src/main/java')

diff --git a/android/app/src/main/java/io/coinos/MainActivity.java b/android/app/src/main/java/io/coinos/MainActivity.java
index 501d2e0f..271ee363 100644
--- a/android/app/src/main/java/io/coinos/MainActivity.java
+++ b/android/app/src/main/java/io/coinos/MainActivity.java
@@ -23,11 +23,16 @@ import android.nfc.NfcAdapter;
 import java.nio.charset.Charset;
 import java.util.Arrays;
 
+import io.coinos.nfcwriter.NfcWriterPlugin;
+
 public class MainActivity extends BridgeActivity {
+    private NfcAdapter nfcAdapter;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         // ✅ Let Capacitor inflate its layout and wire everything
         super.onCreate(savedInstanceState);
+        registerPlugin(NfcWriterPlugin.class);
 
         WebView webView = bridge.getWebView(); // This works *after* super.onCreate()
 
diff --git a/android/app/src/main/java/io/coinos/nfcwriter/NfcWriterPlugin.java b/android/app/src/main/java/io/coinos/nfcwriter/NfcWriterPlugin.java
new file mode 100644
index 00000000..d2954e9b
--- /dev/null
+++ b/android/app/src/main/java/io/coinos/nfcwriter/NfcWriterPlugin.java
@@ -0,0 +1,62 @@
+// src/android/NfcWriterPlugin.java
+package io.coinos.nfcwriter;
+
+import android.nfc.NfcAdapter;
+import android.nfc.Tag;
+import android.nfc.NfcAdapter.ReaderCallback;
+import android.os.Bundle;
+import android.util.Log;
+
+import com.getcapacitor.Plugin;
+import com.getcapacitor.PluginCall;
+import com.getcapacitor.PluginMethod;
+import com.getcapacitor.annotation.CapacitorPlugin;
+
+@CapacitorPlugin(name = "NfcWriter")
+public class NfcWriterPlugin extends Plugin {
+  private NfcAdapter nfcAdapter;
+
+  @Override
+  public void load() {
+    super.load();
+    nfcAdapter = NfcAdapter.getDefaultAdapter(getContext());
+  }
+
+  @PluginMethod
+  public void enableExclusiveNfcMode(PluginCall call) {
+    if (nfcAdapter == null) {
+      call.reject("NFC adapter not available");
+      return;
+    }
+
+    nfcAdapter.enableReaderMode(
+      getActivity(),
+      new ReaderCallback() {
+        @Override
+        public void onTagDiscovered(Tag tag) {
+          Log.d("NfcWriter", "Tag discovered");
+          bridge.getWebView().post(() -> {
+            bridge.getWebView().evaluateJavascript(
+              "window.dispatchEvent(new CustomEvent('nativeNfcTagDiscovered'))",
+              null
+            );
+          });
+        }
+      },
+      NfcAdapter.FLAG_READER_NFC_A |
+      NfcAdapter.FLAG_READER_SKIP_NDEF_CHECK |
+      NfcAdapter.FLAG_READER_NO_PLATFORM_SOUNDS,
+      null
+    );
+
+    call.resolve();
+  }
+
+  @PluginMethod
+  public void disableExclusiveNfcMode(PluginCall call) {
+    if (nfcAdapter != null) {
+      nfcAdapter.disableReaderMode(getActivity());
+    }
+    call.resolve();
+  }
+}
-- 
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