fix: open nfc settings when switched off

android/app/src/main/kotlin/org/fossasia/magic_epaper_app/MainActivity.kt

@@ -1,5 +1,27 @@
 package org.fossasia.magic_epaper_app
 
+import android.content.Intent
+import android.os.Bundle
+import android.provider.Settings
 import io.flutter.embedding.android.FlutterActivity
+import io.flutter.embedding.engine.FlutterEngine
+import io.flutter.plugin.common.MethodChannel
 
-class MainActivity: FlutterActivity()
+class MainActivity : FlutterActivity() {
+    private val CHANNEL = "com.yourapp.nfc/settings"
+
+    override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
+        super.configureFlutterEngine(flutterEngine)
+        MethodChannel(flutterEngine.dartExecutor.binaryMessenger, CHANNEL).setMethodCallHandler {
+            call, result ->
+            if (call.method == "openNFCSettings") {
+                val intent = Intent(Settings.ACTION_NFC_SETTINGS)
+                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+                startActivity(intent)
+                result.success(null)
+            } else {
+                result.notImplemented()
+            }
+        }
+    }
+}

lib/util/nfc_settings_launcher.dart

@@ -0,0 +1,14 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+
+class NFCSettingsLauncher {
+  static const platform = MethodChannel('com.yourapp.nfc/settings');
+
+  static Future<void> openNFCSettings() async {
+    try {
+      await platform.invokeMethod('openNFCSettings');
+    } on PlatformException catch (e) {
+      debugPrint("Failed to open NFC settings: ${e.message}");
+    }
+  }
+}

lib/util/protocol.dart

@@ -1,11 +1,15 @@
+import 'dart:io';
 import 'dart:typed_data';
 
 import 'package:convert/convert.dart';
 import 'package:flutter/widgets.dart';
 import 'package:flutter_nfc_kit/flutter_nfc_kit.dart';
+import 'package:fluttertoast/fluttertoast.dart';
 import 'package:image/image.dart' as img;
 import 'package:magic_epaper_app/util/epd/edp.dart';
+import 'package:app_settings/app_settings.dart';
 import 'package:magic_epaper_app/util/magic_epaper_firmware.dart';
+import 'package:magic_epaper_app/util/nfc_settings_launcher.dart';
 
 class Protocol {
   final fw = MagicEpaperFirmware();
@@ -93,10 +97,24 @@ class Protocol {
 
   void writeImages(img.Image image) async {
     var availability = await FlutterNfcKit.nfcAvailability;
-    if (availability != NFCAvailability.available) {
-      throw "NFC is not available";
+    switch (availability) {
+      case NFCAvailability.available:
+        break;
+      case NFCAvailability.disabled:
+        Fluttertoast.showToast(msg: "NFC is disabled. Please enable it.");
+        if (Platform.isAndroid) {
+          await NFCSettingsLauncher.openNFCSettings();
+        } else if (Platform.isIOS) {
+          await AppSettings.openAppSettings();
+        }
+        return;
+      case NFCAvailability.not_supported:
+        Fluttertoast.showToast(msg: "This device does not support NFC.");
+        return;
     }
 
+    Fluttertoast.showToast(
+        msg: "Bring your phone near to the Magic Epaper Hardware");
     debugPrint("Bring your phone near to the Magic Epaper Hardware");
     final tag = await FlutterNfcKit.poll(timeout: timeout);
     debugPrint("Got a tag!");

pubspec.yaml

@@ -26,6 +26,8 @@ dependencies:
   image: ^4.3.0
   image_picker: ^1.1.2
   image_cropper: ^9.0.0
+  app_settings: ^6.1.1
+  fluttertoast: ^8.2.12
 
 
 dev_dependencies: