From d9f5c393d3f871a8561969f9ee7843b26057caec Mon Sep 17 00:00:00 2001
From: Andi Semler <andirobinsemler@gmail.com>
Date: Thu, 4 Jul 2019 22:32:45 +0200
Subject: [PATCH 1/4] Experimental reader mode API on Android

Using a lot of code from
https://code.tutsplus.com/tutorials/reading-nfc-tags-with-android--mobile-17278

Current caveats and to-dos:
Tags content type must be text/plain. This is a hardcoded value.
---
 .idea/vcs.xml                                 |  7 ++
 .idea/workspace.xml                           | 91 +++++++++++-------
 .../nfc_in_flutter/NfcInFlutterPlugin.java    | 96 ++++++++++++++++++-
 .../android/app/src/main/AndroidManifest.xml  | 14 ++-
 .../app/src/main/res/xml/nfc_tech_filter.xml  |  6 ++
 example/lib/main.dart                         |  2 +-
 lib/src/api.dart                              | 17 +++-
 7 files changed, 192 insertions(+), 41 deletions(-)
 create mode 100644 .idea/vcs.xml
 create mode 100644 example/android/app/src/main/res/xml/nfc_tech_filter.xml

diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..1624a13
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$/example/ios/.symlinks/plugins/nfc_in_flutter" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 660c112..6825159 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -1,7 +1,16 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ChangeListManager">
-    <list default="true" id="61ca71e0-a041-4df5-88bf-471f088cfe68" name="Default Changelist" comment="" />
+    <list default="true" id="61ca71e0-a041-4df5-88bf-471f088cfe68" name="Default Changelist" comment="">
+      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/android/src/main/java/me/andisemler/nfc_in_flutter/NfcInFlutterPlugin.java" beforeDir="false" afterPath="$PROJECT_DIR$/android/src/main/java/me/andisemler/nfc_in_flutter/NfcInFlutterPlugin.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/example/android/app/src/main/AndroidManifest.xml" beforeDir="false" afterPath="$PROJECT_DIR$/example/android/app/src/main/AndroidManifest.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/example/ios/.symlinks/plugins/nfc_in_flutter/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/example/ios/.symlinks/plugins/nfc_in_flutter/.idea/workspace.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/example/ios/.symlinks/plugins/nfc_in_flutter/android/src/main/java/me/andisemler/nfc_in_flutter/NfcInFlutterPlugin.java" beforeDir="false" afterPath="$PROJECT_DIR$/example/ios/.symlinks/plugins/nfc_in_flutter/android/src/main/java/me/andisemler/nfc_in_flutter/NfcInFlutterPlugin.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/example/ios/.symlinks/plugins/nfc_in_flutter/lib/src/api.dart" beforeDir="false" afterPath="$PROJECT_DIR$/example/ios/.symlinks/plugins/nfc_in_flutter/lib/src/api.dart" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/example/lib/main.dart" beforeDir="false" afterPath="$PROJECT_DIR$/example/lib/main.dart" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/lib/src/api.dart" beforeDir="false" afterPath="$PROJECT_DIR$/lib/src/api.dart" afterDir="false" />
+    </list>
     <ignored path="$PROJECT_DIR$/.dart_tool/" />
     <ignored path="$PROJECT_DIR$/.idea/" />
     <ignored path="$PROJECT_DIR$/.pub/" />
@@ -18,34 +27,37 @@
     <option name="testRunner" value="GRADLE" />
     <option name="delegatedBuild" value="true" />
   </component>
+  <component name="FavoritesManager">
+    <favorites_list name="nfc_in_flutter" />
+  </component>
   <component name="FileEditorManager">
     <leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
       <file pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/lib/nfc_in_flutter.dart">
           <provider selected="true" editor-type-id="text-editor">
             <state>
-              <caret column="24" selection-start-column="24" selection-end-column="24" />
+              <caret column="17" selection-start-column="17" selection-end-column="17" />
             </state>
           </provider>
         </entry>
       </file>
       <file pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/lib/src/messages.dart">
+        <entry file="file://$PROJECT_DIR$/lib/src/api.dart">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="225">
-              <caret line="15" column="35" selection-start-line="15" selection-start-column="35" selection-end-line="15" selection-end-column="35" />
+            <state relative-caret-position="312">
+              <caret line="116" column="7" selection-start-line="116" selection-start-column="7" selection-end-line="116" selection-end-column="7" />
+              <folding>
+                <element signature="e#0#20#0" expanded="true" />
+              </folding>
             </state>
           </provider>
         </entry>
       </file>
-      <file pinned="false" current-in-tab="true">
-        <entry file="file://$PROJECT_DIR$/lib/src/api.dart">
+      <file pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/lib/src/messages.dart">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="292">
-              <caret line="70" column="9" selection-start-line="70" selection-start-column="9" selection-end-line="70" selection-end-column="9" />
-              <folding>
-                <element signature="e#0#20#0" expanded="true" />
-              </folding>
+            <state relative-caret-position="345">
+              <caret line="23" column="3" selection-start-line="23" selection-start-column="3" selection-end-line="23" selection-end-column="3" />
             </state>
           </provider>
         </entry>
@@ -54,16 +66,16 @@
         <entry file="file://$PROJECT_DIR$/lib/src/exceptions.dart">
           <provider selected="true" editor-type-id="text-editor">
             <state relative-caret-position="705">
-              <caret line="47" column="12" lean-forward="true" selection-start-line="47" selection-start-column="12" selection-end-line="47" selection-end-column="12" />
+              <caret line="47" column="12" selection-start-line="47" selection-start-column="12" selection-end-line="47" selection-end-column="12" />
             </state>
           </provider>
         </entry>
       </file>
-      <file pinned="false" current-in-tab="false">
+      <file pinned="false" current-in-tab="true">
         <entry file="file://$PROJECT_DIR$/example/lib/main.dart">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="1920">
-              <caret line="131" column="12" lean-forward="true" selection-start-line="131" selection-start-column="12" selection-end-line="131" selection-end-column="12" />
+            <state relative-caret-position="236">
+              <caret line="26" column="109" selection-start-line="26" selection-start-column="90" selection-end-line="26" selection-end-column="109" />
               <folding>
                 <element signature="e#0#20#0" expanded="true" />
               </folding>
@@ -80,6 +92,9 @@
       </list>
     </option>
   </component>
+  <component name="Git.Settings">
+    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
+  </component>
   <component name="IdeDocumentHistory">
     <option name="CHANGED_PATHS">
       <list>
@@ -88,10 +103,10 @@
         <option value="$PROJECT_DIR$/pubspec.yaml" />
         <option value="$PROJECT_DIR$/example/lib/src/messages.dart" />
         <option value="$PROJECT_DIR$/lib/nfc_in_flutter.dart" />
-        <option value="$PROJECT_DIR$/example/lib/main.dart" />
         <option value="$PROJECT_DIR$/lib/src/messages.dart" />
         <option value="$PROJECT_DIR$/lib/src/exceptions.dart" />
         <option value="$PROJECT_DIR$/lib/src/api.dart" />
+        <option value="$PROJECT_DIR$/example/lib/main.dart" />
       </list>
     </option>
   </component>
@@ -101,11 +116,14 @@
     <option name="width" value="1087" />
     <option name="height" value="823" />
   </component>
+  <component name="ProjectLevelVcsManager" settingsEditedManually="true" />
   <component name="ProjectView">
     <navigator proportions="" version="1">
       <foldersAlwaysOnTop value="true" />
     </navigator>
     <panes>
+      <pane id="PackagesPane" />
+      <pane id="Scope" />
       <pane id="ProjectPane">
         <subPane>
           <expand>
@@ -144,11 +162,10 @@
           <select />
         </subPane>
       </pane>
-      <pane id="Scope" />
-      <pane id="PackagesPane" />
     </panes>
   </component>
   <component name="PropertiesComponent">
+    <property name="SHARE_PROJECT_CONFIGURATION_FILES" value="true" />
     <property name="dart.analysis.tool.window.force.activate" value="false" />
     <property name="io.flutter.reload.alreadyRun" value="true" />
     <property name="last_opened_file_path" value="$PROJECT_DIR$" />
@@ -178,13 +195,13 @@
     <frame x="573" y="70" width="1087" height="823" extended-state="0" />
     <editor active="true" />
     <layout>
-      <window_info active="true" content_ui="combo" id="Project" order="0" visible="true" weight="0.25454545" />
+      <window_info content_ui="combo" id="Project" order="0" sideWeight="0.4979592" visible="true" weight="0.26411483" />
       <window_info id="Structure" order="1" side_tool="true" />
       <window_info id="Designer" order="2" />
-      <window_info id="Favorites" order="3" side_tool="true" />
+      <window_info active="true" id="Favorites" order="3" sideWeight="0.5020408" side_tool="true" visible="true" weight="0.26411483" />
       <window_info anchor="bottom" id="Dart Analysis" order="0" weight="0.32968536" />
       <window_info anchor="bottom" id="Docker" order="1" />
-      <window_info anchor="bottom" id="Run" order="2" weight="0.32968536" />
+      <window_info anchor="bottom" id="Run" order="2" visible="true" weight="0.32968536" />
       <window_info anchor="bottom" id="TODO" order="3" />
       <window_info anchor="bottom" id="Debug" order="4" />
       <window_info anchor="bottom" id="Event Log" order="5" side_tool="true" />
@@ -276,41 +293,41 @@
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/example/lib/main.dart">
+    <entry file="file://$PROJECT_DIR$/lib/src/exceptions.dart">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="1920">
-          <caret line="131" column="12" lean-forward="true" selection-start-line="131" selection-start-column="12" selection-end-line="131" selection-end-column="12" />
-          <folding>
-            <element signature="e#0#20#0" expanded="true" />
-          </folding>
+        <state relative-caret-position="705">
+          <caret line="47" column="12" selection-start-line="47" selection-start-column="12" selection-end-line="47" selection-end-column="12" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/lib/src/messages.dart">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="225">
-          <caret line="15" column="35" selection-start-line="15" selection-start-column="35" selection-end-line="15" selection-end-column="35" />
+        <state relative-caret-position="345">
+          <caret line="23" column="3" selection-start-line="23" selection-start-column="3" selection-end-line="23" selection-end-column="3" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/lib/nfc_in_flutter.dart">
       <provider selected="true" editor-type-id="text-editor">
         <state>
-          <caret column="24" selection-start-column="24" selection-end-column="24" />
+          <caret column="17" selection-start-column="17" selection-end-column="17" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/lib/src/exceptions.dart">
+    <entry file="file://$PROJECT_DIR$/lib/src/api.dart">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="705">
-          <caret line="47" column="12" lean-forward="true" selection-start-line="47" selection-start-column="12" selection-end-line="47" selection-end-column="12" />
+        <state relative-caret-position="312">
+          <caret line="116" column="7" selection-start-line="116" selection-start-column="7" selection-end-line="116" selection-end-column="7" />
+          <folding>
+            <element signature="e#0#20#0" expanded="true" />
+          </folding>
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/lib/src/api.dart">
+    <entry file="file://$PROJECT_DIR$/example/lib/main.dart">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="292">
-          <caret line="70" column="9" selection-start-line="70" selection-start-column="9" selection-end-line="70" selection-end-column="9" />
+        <state relative-caret-position="236">
+          <caret line="26" column="109" selection-start-line="26" selection-start-column="90" selection-end-line="26" selection-end-column="109" />
           <folding>
             <element signature="e#0#20#0" expanded="true" />
           </folding>
diff --git a/android/src/main/java/me/andisemler/nfc_in_flutter/NfcInFlutterPlugin.java b/android/src/main/java/me/andisemler/nfc_in_flutter/NfcInFlutterPlugin.java
index 475e599..6f0e24e 100644
--- a/android/src/main/java/me/andisemler/nfc_in_flutter/NfcInFlutterPlugin.java
+++ b/android/src/main/java/me/andisemler/nfc_in_flutter/NfcInFlutterPlugin.java
@@ -1,6 +1,9 @@
 package me.andisemler.nfc_in_flutter;
 
 import android.app.Activity;
+import android.app.PendingIntent;
+import android.content.Intent;
+import android.content.IntentFilter;
 import android.nfc.FormatException;
 import android.nfc.NdefMessage;
 import android.nfc.NdefRecord;
@@ -9,6 +12,7 @@
 import android.nfc.tech.Ndef;
 import android.os.Bundle;
 import android.os.Handler;
+import android.util.Log;
 
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
@@ -16,23 +20,29 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 
 import io.flutter.plugin.common.EventChannel;
 import io.flutter.plugin.common.MethodCall;
 import io.flutter.plugin.common.MethodChannel;
 import io.flutter.plugin.common.MethodChannel.MethodCallHandler;
 import io.flutter.plugin.common.MethodChannel.Result;
+import io.flutter.plugin.common.PluginRegistry;
 import io.flutter.plugin.common.PluginRegistry.Registrar;
 
 /**
  * NfcInFlutterPlugin
  */
-public class NfcInFlutterPlugin implements MethodCallHandler, EventChannel.StreamHandler, NfcAdapter.ReaderCallback {
+public class NfcInFlutterPlugin implements MethodCallHandler,
+        EventChannel.StreamHandler,
+        PluginRegistry.NewIntentListener,
+        NfcAdapter.ReaderCallback {
     private static final String LOG_TAG = "NfcInFlutterPlugin";
 
     private final Activity activity;
     private NfcAdapter adapter;
     private EventChannel.EventSink events;
+    private String currentReadingMode = null;
 
     /**
      * Plugin registration.
@@ -41,6 +51,7 @@ public static void registerWith(Registrar registrar) {
         final MethodChannel channel = new MethodChannel(registrar.messenger(), "nfc_in_flutter");
         final EventChannel tagChannel = new EventChannel(registrar.messenger(), "nfc_in_flutter/tags");
         NfcInFlutterPlugin plugin = new NfcInFlutterPlugin(registrar.activity());
+        registrar.addNewIntentListener(plugin);
         channel.setMethodCallHandler(plugin);
         tagChannel.setStreamHandler(plugin);
     }
@@ -56,6 +67,29 @@ public void onMethodCall(MethodCall call, Result result) {
                 result.success(nfcIsEnabled());
                 break;
             case "startNDEFReading":
+                if (call.arguments instanceof HashMap) {
+                    HashMap args = (HashMap) call.arguments;
+                    String readerMode = (String) args.get("reader_mode");
+                    if (readerMode != null) {
+                        if (currentReadingMode != null && !readerMode.equals(currentReadingMode)) {
+                            // Throw error if the user tries to start reading with another reading mode
+                            // than the one currently active
+                            result.error("NFCMultipleReadingModes", "multiple reading modes", "");
+                            return;
+                        }
+                        switch (readerMode) {
+                            case "normal":
+                                startReading();
+                                break;
+                            case "foreground_dispatch":
+                                startReadingWithForegroundDispatch();
+                                break;
+                            default:
+                                result.error("NFCUnknownReaderMode", "unknown reader mode: " + readerMode, "");
+                        }
+                        return;
+                    }
+                }
                 startReading();
                 result.success(null);
                 break;
@@ -77,6 +111,30 @@ private void startReading() {
         adapter.enableReaderMode(activity, this, NfcAdapter.FLAG_READER_NFC_A, bundle);
     }
 
+    private void startReadingWithForegroundDispatch() {
+        adapter = NfcAdapter.getDefaultAdapter(activity);
+        if (adapter == null) return;
+        Intent intent = new Intent(activity.getApplicationContext(), activity.getClass());
+        intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
+
+        PendingIntent pendingIntent = PendingIntent.getActivity(activity.getApplicationContext(), 0, intent, 0);
+
+        IntentFilter[] filters = new IntentFilter[1];
+        String[][] techList = new String[][]{};
+
+        filters[0] = new IntentFilter();
+        filters[0].addAction(NfcAdapter.ACTION_NDEF_DISCOVERED);
+        filters[0].addCategory(Intent.CATEGORY_DEFAULT);
+        try {
+            filters[0].addDataType("text/plain");
+        } catch (IntentFilter.MalformedMimeTypeException e) {
+            // TODO: THROW THE ERROR
+            return;
+        }
+
+        adapter.enableForegroundDispatch(activity, pendingIntent, filters, techList);
+    }
+
     @Override
     public void onListen(Object args, EventChannel.EventSink eventSink) {
         events = eventSink;
@@ -85,10 +143,16 @@ public void onListen(Object args, EventChannel.EventSink eventSink) {
     @Override
     public void onCancel(Object args) {
         events = null;
+        currentReadingMode = null;
     }
 
     @Override
     public void onTagDiscovered(Tag tag) {
+        handleNDEFTag(tag);
+    }
+
+    private void handleNDEFTag(Tag tag) {
+        Log.i(LOG_TAG, "new tag");
         Ndef ndef = Ndef.get(tag);
         if (ndef == null) {
             // tag is not in NDEF format; skip!
@@ -158,4 +222,34 @@ public void run() {
         mainThread.post(runnable);
     }
 
+    @Override
+    public boolean onNewIntent(Intent intent) {
+        String action = intent.getAction();
+        if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(action)) {
+
+            String type = intent.getType();
+            if (Objects.equals(type, "text/plain")) {
+
+                Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
+                handleNDEFTag(tag);
+                return true;
+            } else {
+                Log.d(LOG_TAG, "Wrong mime type: " + type);
+            }
+        } else if (NfcAdapter.ACTION_TECH_DISCOVERED.equals(action)) {
+
+            // In case we would still use the Tech Discovered Intent
+            Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
+            String[] techList = tag.getTechList();
+            String searchedTech = Ndef.class.getName();
+
+            for (String tech : techList) {
+                if (searchedTech.equals(tech)) {
+                    handleNDEFTag(tag);
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
 }
diff --git a/example/android/app/src/main/AndroidManifest.xml b/example/android/app/src/main/AndroidManifest.xml
index aaccaa0..723bf5e 100644
--- a/example/android/app/src/main/AndroidManifest.xml
+++ b/example/android/app/src/main/AndroidManifest.xml
@@ -1,4 +1,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     package="me.andisemler.nfc_in_flutter_example">
 
     <!-- io.flutter.app.FlutterApplication is an android.app.Application that
@@ -9,7 +10,8 @@
     <application
         android:name="io.flutter.app.FlutterApplication"
         android:label="nfc_in_flutter_example"
-        android:icon="@mipmap/ic_launcher">
+        android:icon="@mipmap/ic_launcher"
+        tools:ignore="GoogleAppIndexingWarning">
         <activity
             android:name=".MainActivity"
             android:launchMode="singleTop"
@@ -28,6 +30,16 @@
                 <action android:name="android.intent.action.MAIN"/>
                 <category android:name="android.intent.category.LAUNCHER"/>
             </intent-filter>
+
+            <intent-filter>
+                <action android:name="android.nfc.action.NDEF_DISCOVERED" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <data android:mimeType="text/plain" />
+            </intent-filter>
+
+            <meta-data
+                android:name="android.nfc.action.TECH_DISCOVERED"
+                android:resource="@xml/nfc_tech_filter" />
         </activity>
     </application>
 </manifest>
diff --git a/example/android/app/src/main/res/xml/nfc_tech_filter.xml b/example/android/app/src/main/res/xml/nfc_tech_filter.xml
new file mode 100644
index 0000000..01f7ade
--- /dev/null
+++ b/example/android/app/src/main/res/xml/nfc_tech_filter.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
+    <tech-list>
+        <tech>android.nfc.tech.Ndef</tech>
+    </tech-list>
+</resources>
\ No newline at end of file
diff --git a/example/lib/main.dart b/example/lib/main.dart
index 08107ed..a19df56 100644
--- a/example/lib/main.dart
+++ b/example/lib/main.dart
@@ -24,7 +24,7 @@ class _MyAppState extends State<MyApp> {
   // tags in state
   void _readNFC(BuildContext context) {
     // ignore: cancel_subscriptions
-    StreamSubscription<NDEFMessage> subscription = NFC.readNDEF().listen((tag) {
+    StreamSubscription<NDEFMessage> subscription = NFC.readNDEF(readerMode: NFCReaderMode.foreground_dispatch).listen((tag) {
       // On new tag, add it to state
       setState(() {
         _tags.insert(0, tag);
diff --git a/lib/src/api.dart b/lib/src/api.dart
index 732b694..9760b9e 100644
--- a/lib/src/api.dart
+++ b/lib/src/api.dart
@@ -6,6 +6,8 @@ import 'package:flutter/services.dart';
 import './exceptions.dart';
 import './messages.dart';
 
+enum NFCReaderMode { normal, foreground_dispatch }
+
 class NFC {
   static MethodChannel _channel = MethodChannel("nfc_in_flutter");
   static const EventChannel _eventChannel =
@@ -23,7 +25,10 @@ class NFC {
 
       /// throwOnUserCancel decides if a [NFCUserCanceledSessionException] error
       /// should be thrown on iOS when the user clicks Cancel/Done.
-      bool throwOnUserCancel = true}) {
+      bool throwOnUserCancel = true,
+
+      /// TODO: Documentation
+      NFCReaderMode readerMode = NFCReaderMode.normal}) {
     if (_tagStream == null) {
       _tagStream = _eventChannel.receiveBroadcastStream().where((tag) {
         // In the future when more tag types are supported, this must be changed.
@@ -96,9 +101,19 @@ class NFC {
       return controller.close();
     });
 
+    String mode;
+    switch (readerMode) {
+      case NFCReaderMode.normal:
+        mode = "normal";
+        break;
+      case NFCReaderMode.foreground_dispatch:
+        mode = "foreground_dispatch";
+        break;
+    }
     // Start reading
     _channel.invokeMethod("startNDEFReading", {
       "scan_once": once,
+      "reader_mode": mode,
     });
 
     return controller.stream;

From 40c000afd40317b07d46ef7dffcdbff0ffc79ebc Mon Sep 17 00:00:00 2001
From: Andi Semler <andirobinsemler@gmail.com>
Date: Fri, 5 Jul 2019 08:58:25 +0200
Subject: [PATCH 2/4] Possible fixes

---
 .../nfc_in_flutter/NfcInFlutterPlugin.java    | 63 +++++++++++--------
 1 file changed, 37 insertions(+), 26 deletions(-)

diff --git a/android/src/main/java/me/andisemler/nfc_in_flutter/NfcInFlutterPlugin.java b/android/src/main/java/me/andisemler/nfc_in_flutter/NfcInFlutterPlugin.java
index 6f0e24e..857106b 100644
--- a/android/src/main/java/me/andisemler/nfc_in_flutter/NfcInFlutterPlugin.java
+++ b/android/src/main/java/me/andisemler/nfc_in_flutter/NfcInFlutterPlugin.java
@@ -148,10 +148,6 @@ public void onCancel(Object args) {
 
     @Override
     public void onTagDiscovered(Tag tag) {
-        handleNDEFTag(tag);
-    }
-
-    private void handleNDEFTag(Tag tag) {
         Log.i(LOG_TAG, "new tag");
         Ndef ndef = Ndef.get(tag);
         if (ndef == null) {
@@ -159,25 +155,19 @@ private void handleNDEFTag(Tag tag) {
             return;
         }
         try {
-            final Map<String, Object> result = new HashMap<>();
-            List<Map<String, String>> records = new ArrayList<>();
             ndef.connect();
             NdefMessage message = ndef.getNdefMessage();
             if (message == null) {
                 return;
             }
-            for (NdefRecord record : message.getRecords()) {
-                Map<String, String> recordMap = new HashMap<>();
-                recordMap.put("payload", new String(record.getPayload(), StandardCharsets.UTF_8));
-                recordMap.put("id", new String(record.getId(), StandardCharsets.UTF_8));
-                recordMap.put("type", new String(record.getType(), StandardCharsets.UTF_8));
-                recordMap.put("tnf", String.valueOf(record.getTnf()));
-                records.add(recordMap);
-            }
-            result.put("message_type", "ndef");
-            result.put("type", ndef.getType());
-            result.put("records", records);
-            eventSuccess(result);
+            eventSuccess(formatNDEFMessageToResult(ndef, message));
+        } catch (IOException e) {
+            Map<String, Object> details = new HashMap<>();
+            details.put("fatal", true);
+            eventError("IOError", e.getMessage(), details);
+        } catch (FormatException e) {
+            eventError("NDEFBadFormatError", e.getMessage(), null);
+        } finally {
             try {
                 ndef.close();
             } catch (IOException e) {
@@ -185,15 +175,26 @@ private void handleNDEFTag(Tag tag) {
                 details.put("fatal", false);
                 eventError("IOError", e.getMessage(), details);
             }
-        } catch (IOException e) {
-            Map<String, Object> details = new HashMap<>();
-            details.put("fatal", true);
-            eventError("IOError", e.getMessage(), details);
-        } catch (FormatException e) {
-            eventError("NDEFBadFormatError", e.getMessage(), null);
         }
     }
 
+    private Map<String, Object> formatNDEFMessageToResult(Ndef ndef, NdefMessage message) {
+        final Map<String, Object> result = new HashMap<>();
+        List<Map<String, String>> records = new ArrayList<>();
+        for (NdefRecord record : message.getRecords()) {
+            Map<String, String> recordMap = new HashMap<>();
+            recordMap.put("payload", new String(record.getPayload(), StandardCharsets.UTF_8));
+            recordMap.put("id", new String(record.getId(), StandardCharsets.UTF_8));
+            recordMap.put("type", new String(record.getType(), StandardCharsets.UTF_8));
+            recordMap.put("tnf", String.valueOf(record.getTnf()));
+            records.add(recordMap);
+        }
+        result.put("message_type", "ndef");
+        result.put("type", ndef.getType());
+        result.put("records", records);
+        return result;
+    }
+
     private void eventSuccess(final Object result) {
         Handler mainThread = new Handler(activity.getMainLooper());
         Runnable runnable = new Runnable() {
@@ -231,7 +232,7 @@ public boolean onNewIntent(Intent intent) {
             if (Objects.equals(type, "text/plain")) {
 
                 Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
-                handleNDEFTag(tag);
+                handleNDEFTagFromIntent(tag);
                 return true;
             } else {
                 Log.d(LOG_TAG, "Wrong mime type: " + type);
@@ -245,11 +246,21 @@ public boolean onNewIntent(Intent intent) {
 
             for (String tech : techList) {
                 if (searchedTech.equals(tech)) {
-                    handleNDEFTag(tag);
+                    handleNDEFTagFromIntent(tag);
                     return true;
                 }
             }
         }
         return false;
     }
+
+    private void handleNDEFTagFromIntent(Tag tag) {
+        Ndef ndef = Ndef.get(tag);
+        if (ndef == null) {
+            return;
+        }
+
+        NdefMessage message = ndef.getCachedNdefMessage();
+        eventSuccess(formatNDEFMessageToResult(ndef, message));
+    }
 }

From 23cfeee09585f3d88bbe8b4e861d840c4cb827b6 Mon Sep 17 00:00:00 2001
From: Andi Semler <andirobinsemler@gmail.com>
Date: Sat, 6 Jul 2019 16:30:05 +0200
Subject: [PATCH 3/4] Finalize host card emulation support

---
 README.md                                     |  20 +++
 .../nfc_in_flutter/NfcInFlutterPlugin.java    | 135 +++++++-----------
 .../android/app/src/main/AndroidManifest.xml  |   6 +-
 .../app/src/main/res/xml/nfc_tech_filter.xml  |   6 -
 example/lib/main.dart                         |  78 +++++-----
 lib/nfc_in_flutter.dart                       |   3 +-
 lib/src/api.dart                              |  36 ++---
 lib/src/exceptions.dart                       |   9 ++
 lib/src/reader_modes.dart                     |  20 +++
 9 files changed, 165 insertions(+), 148 deletions(-)
 delete mode 100644 example/android/app/src/main/res/xml/nfc_tech_filter.xml
 create mode 100644 lib/src/reader_modes.dart

diff --git a/README.md b/README.md
index 052dcbf..4a94c28 100644
--- a/README.md
+++ b/README.md
@@ -141,6 +141,26 @@ If your app **requires** NFC, you can add the following to only allow it to be d
 
 If you're new to NFC you may come to expect a lot of `readNFC()` calls, but instead you see `readNDEF()` and `NDEFMessage`. NDEF is just a formatting standard the tags can be encoded in. There are other encodings than NDEF, but NDEF is the most common one. Currently NFC in Flutter only supports NDEF formatted tags.
 
+## Host Card Emulation
+
+NFC in Flutter supports reading from emulated host cards, however only on Android as Apple doesn't allow it on iOS.
+
+To read from emulated host cards, you need to do a few things.
+
+- Call `readNDEF()` with the `readerMode` argument set to an instance of `NFCDispatchReaderMode`.
+- Insert the following `<intent-filter />` in your `AndroidManifest.xml` activity:
+
+```xml
+<intent-filter>
+    <action android:name="android.nfc.action.NDEF_DISCOVERED" />
+    <category android:name="android.intent.category.DEFAULT" />
+</intent-filter>
+```
+
+### ⚠️ Multiple reader modes
+
+If you start a `readNDEF()` stream a `NFCDispatchReaderMode` while another stream is active with the `NFCNormalReaderMode`, it will throw a `NFCMultipleReaderModesException`.
+
 ## Platform differences
 
 When you call `readNDEF()` on iOS, Core NFC (the iOS framework that allows NFC reading) opens a little window. On Android it just starts listening for NFC tag reads in the background.
diff --git a/android/src/main/java/me/andisemler/nfc_in_flutter/NfcInFlutterPlugin.java b/android/src/main/java/me/andisemler/nfc_in_flutter/NfcInFlutterPlugin.java
index 857106b..55cde67 100644
--- a/android/src/main/java/me/andisemler/nfc_in_flutter/NfcInFlutterPlugin.java
+++ b/android/src/main/java/me/andisemler/nfc_in_flutter/NfcInFlutterPlugin.java
@@ -3,7 +3,6 @@
 import android.app.Activity;
 import android.app.PendingIntent;
 import android.content.Intent;
-import android.content.IntentFilter;
 import android.nfc.FormatException;
 import android.nfc.NdefMessage;
 import android.nfc.NdefRecord;
@@ -12,7 +11,6 @@
 import android.nfc.tech.Ndef;
 import android.os.Bundle;
 import android.os.Handler;
-import android.util.Log;
 
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
@@ -20,7 +18,6 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.Objects;
 
 import io.flutter.plugin.common.EventChannel;
 import io.flutter.plugin.common.MethodCall;
@@ -37,12 +34,12 @@ public class NfcInFlutterPlugin implements MethodCallHandler,
         EventChannel.StreamHandler,
         PluginRegistry.NewIntentListener,
         NfcAdapter.ReaderCallback {
-    private static final String LOG_TAG = "NfcInFlutterPlugin";
 
     private final Activity activity;
     private NfcAdapter adapter;
     private EventChannel.EventSink events;
-    private String currentReadingMode = null;
+
+    private String currentReaderMode = null;
 
     /**
      * Plugin registration.
@@ -67,30 +64,35 @@ public void onMethodCall(MethodCall call, Result result) {
                 result.success(nfcIsEnabled());
                 break;
             case "startNDEFReading":
-                if (call.arguments instanceof HashMap) {
-                    HashMap args = (HashMap) call.arguments;
-                    String readerMode = (String) args.get("reader_mode");
-                    if (readerMode != null) {
-                        if (currentReadingMode != null && !readerMode.equals(currentReadingMode)) {
-                            // Throw error if the user tries to start reading with another reading mode
-                            // than the one currently active
-                            result.error("NFCMultipleReadingModes", "multiple reading modes", "");
-                            return;
-                        }
-                        switch (readerMode) {
-                            case "normal":
-                                startReading();
-                                break;
-                            case "foreground_dispatch":
-                                startReadingWithForegroundDispatch();
-                                break;
-                            default:
-                                result.error("NFCUnknownReaderMode", "unknown reader mode: " + readerMode, "");
-                        }
+                if (!(call.arguments instanceof HashMap)) {
+                    result.error("MissingArguments", "startNDEFReading was called with no arguments", "");
+                    return;
+                }
+                HashMap args = (HashMap) call.arguments;
+                String readerMode = (String) args.get("reader_mode");
+                if (readerMode == null) {
+                    result.error("MissingReaderMode", "startNDEFReading was called without a reader mode", "");
+                    return;
+                }
+
+                if (currentReaderMode != null && !readerMode.equals(currentReaderMode)) {
+                    // Throw error if the user tries to start reading with another reading mode
+                    // than the one currently active
+                    result.error("NFCMultipleReaderModes", "multiple reader modes", "");
+                    return;
+                }
+                currentReaderMode = readerMode;
+                switch (readerMode) {
+                    case "normal":
+                        startReading();
+                        break;
+                    case "dispatch":
+                        startReadingWithForegroundDispatch();
+                        break;
+                    default:
+                        result.error("NFCUnknownReaderMode", "unknown reader mode: " + readerMode, "");
                         return;
-                    }
                 }
-                startReading();
                 result.success(null);
                 break;
             default:
@@ -118,21 +120,9 @@ private void startReadingWithForegroundDispatch() {
         intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
 
         PendingIntent pendingIntent = PendingIntent.getActivity(activity.getApplicationContext(), 0, intent, 0);
-
-        IntentFilter[] filters = new IntentFilter[1];
         String[][] techList = new String[][]{};
 
-        filters[0] = new IntentFilter();
-        filters[0].addAction(NfcAdapter.ACTION_NDEF_DISCOVERED);
-        filters[0].addCategory(Intent.CATEGORY_DEFAULT);
-        try {
-            filters[0].addDataType("text/plain");
-        } catch (IntentFilter.MalformedMimeTypeException e) {
-            // TODO: THROW THE ERROR
-            return;
-        }
-
-        adapter.enableForegroundDispatch(activity, pendingIntent, filters, techList);
+        adapter.enableForegroundDispatch(activity, pendingIntent, null, techList);
     }
 
     @Override
@@ -143,12 +133,11 @@ public void onListen(Object args, EventChannel.EventSink eventSink) {
     @Override
     public void onCancel(Object args) {
         events = null;
-        currentReadingMode = null;
+        currentReaderMode = null;
     }
 
     @Override
     public void onTagDiscovered(Tag tag) {
-        Log.i(LOG_TAG, "new tag");
         Ndef ndef = Ndef.get(tag);
         if (ndef == null) {
             // tag is not in NDEF format; skip!
@@ -178,6 +167,27 @@ public void onTagDiscovered(Tag tag) {
         }
     }
 
+    @Override
+    public boolean onNewIntent(Intent intent) {
+        String action = intent.getAction();
+        if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(action)) {
+            Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
+            handleNDEFTagFromIntent(tag);
+            return true;
+        }
+        return false;
+    }
+
+    private void handleNDEFTagFromIntent(Tag tag) {
+        Ndef ndef = Ndef.get(tag);
+        if (ndef == null) {
+            return;
+        }
+
+        NdefMessage message = ndef.getCachedNdefMessage();
+        eventSuccess(formatNDEFMessageToResult(ndef, message));
+    }
+
     private Map<String, Object> formatNDEFMessageToResult(Ndef ndef, NdefMessage message) {
         final Map<String, Object> result = new HashMap<>();
         List<Map<String, String>> records = new ArrayList<>();
@@ -222,45 +232,4 @@ public void run() {
         };
         mainThread.post(runnable);
     }
-
-    @Override
-    public boolean onNewIntent(Intent intent) {
-        String action = intent.getAction();
-        if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(action)) {
-
-            String type = intent.getType();
-            if (Objects.equals(type, "text/plain")) {
-
-                Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
-                handleNDEFTagFromIntent(tag);
-                return true;
-            } else {
-                Log.d(LOG_TAG, "Wrong mime type: " + type);
-            }
-        } else if (NfcAdapter.ACTION_TECH_DISCOVERED.equals(action)) {
-
-            // In case we would still use the Tech Discovered Intent
-            Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
-            String[] techList = tag.getTechList();
-            String searchedTech = Ndef.class.getName();
-
-            for (String tech : techList) {
-                if (searchedTech.equals(tech)) {
-                    handleNDEFTagFromIntent(tag);
-                    return true;
-                }
-            }
-        }
-        return false;
-    }
-
-    private void handleNDEFTagFromIntent(Tag tag) {
-        Ndef ndef = Ndef.get(tag);
-        if (ndef == null) {
-            return;
-        }
-
-        NdefMessage message = ndef.getCachedNdefMessage();
-        eventSuccess(formatNDEFMessageToResult(ndef, message));
-    }
 }
diff --git a/example/android/app/src/main/AndroidManifest.xml b/example/android/app/src/main/AndroidManifest.xml
index 723bf5e..675d3c8 100644
--- a/example/android/app/src/main/AndroidManifest.xml
+++ b/example/android/app/src/main/AndroidManifest.xml
@@ -34,12 +34,8 @@
             <intent-filter>
                 <action android:name="android.nfc.action.NDEF_DISCOVERED" />
                 <category android:name="android.intent.category.DEFAULT" />
-                <data android:mimeType="text/plain" />
+                <data android:mimeType="application/json" />
             </intent-filter>
-
-            <meta-data
-                android:name="android.nfc.action.TECH_DISCOVERED"
-                android:resource="@xml/nfc_tech_filter" />
         </activity>
     </application>
 </manifest>
diff --git a/example/android/app/src/main/res/xml/nfc_tech_filter.xml b/example/android/app/src/main/res/xml/nfc_tech_filter.xml
deleted file mode 100644
index 01f7ade..0000000
--- a/example/android/app/src/main/res/xml/nfc_tech_filter.xml
+++ /dev/null
@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
-    <tech-list>
-        <tech>android.nfc.tech.Ndef</tech>
-    </tech-list>
-</resources>
\ No newline at end of file
diff --git a/example/lib/main.dart b/example/lib/main.dart
index a19df56..40315b2 100644
--- a/example/lib/main.dart
+++ b/example/lib/main.dart
@@ -23,45 +23,51 @@ class _MyAppState extends State<MyApp> {
   // _readNFC() calls `NFC.readNDEF()` and stores the subscription and scanned
   // tags in state
   void _readNFC(BuildContext context) {
-    // ignore: cancel_subscriptions
-    StreamSubscription<NDEFMessage> subscription = NFC.readNDEF(readerMode: NFCReaderMode.foreground_dispatch).listen((tag) {
-      // On new tag, add it to state
-      setState(() {
-        _tags.insert(0, tag);
-      });
-    },
-        // When the stream is done, remove the subscription from state
-        onDone: () {
-      setState(() {
-        _stream = null;
+    try {
+      // ignore: cancel_subscriptions
+      StreamSubscription<NDEFMessage> subscription =
+          NFC.readNDEF(readerMode: NFCDispatchReaderMode()).listen((tag) {
+        // On new tag, add it to state
+        setState(() {
+          _tags.insert(0, tag);
+        });
+      },
+              // When the stream is done, remove the subscription from state
+              onDone: () {
+        setState(() {
+          _stream = null;
+        });
+      },
+              // Errors are unlikely to happen on Android unless the NFC tags are
+              // poorly formatted or removed too soon, however on iOS at least one
+              // error is likely to happen. NFCUserCanceledSessionException will
+              // always happen unless you call readNDEF() with the `throwOnUserCancel`
+              // argument set to false.
+              // NFCSessionTimeoutException will be thrown if the session timer exceeds
+              // 60 seconds (iOS only).
+              // And then there are of course errors for unexpected stuff. Good fun!
+              onError: (e) {
+        setState(() {
+          _stream = null;
+        });
+
+        if (!(e is NFCUserCanceledSessionException)) {
+          showDialog(
+            context: context,
+            builder: (context) => AlertDialog(
+                  title: const Text("Error!"),
+                  content: Text(e.toString()),
+                ),
+          );
+        }
       });
-    },
-        // Errors are unlikely to happen on Android unless the NFC tags are
-        // poorly formatted or removed too soon, however on iOS at least one
-        // error is likely to happen. NFCUserCanceledSessionException will
-        // always happen unless you call readNDEF() with the `throwOnUserCancel`
-        // argument set to false.
-        // NFCSessionTimeoutException will be thrown if the session timer exceeds
-        // 60 seconds (iOS only).
-        // And then there are of course errors for unexpected stuff. Good fun!
-        onError: (e) {
+
       setState(() {
-        _stream = null;
+        _stream = subscription;
       });
-
-      if (!(e is NFCUserCanceledSessionException)) {
-        showDialog(
-          context: context,
-          builder: (context) => AlertDialog(
-                title: const Text("Error!"),
-                content: Text(e.toString()),
-              ),
-        );
-      }
-    });
-    setState(() {
-      _stream = subscription;
-    });
+    } catch (err) {
+      print("error: $err");
+    }
   }
 
   // _stopReading() cancels the current reading stream
diff --git a/lib/nfc_in_flutter.dart b/lib/nfc_in_flutter.dart
index 910e0dc..4b3b3fa 100644
--- a/lib/nfc_in_flutter.dart
+++ b/lib/nfc_in_flutter.dart
@@ -1,3 +1,4 @@
 export './src/api.dart';
 export "./src/messages.dart";
-export "./src/exceptions.dart";
\ No newline at end of file
+export "./src/exceptions.dart";
+export "./src/reader_modes.dart";
diff --git a/lib/src/api.dart b/lib/src/api.dart
index 9760b9e..7c82d66 100644
--- a/lib/src/api.dart
+++ b/lib/src/api.dart
@@ -3,11 +3,10 @@ import 'dart:core';
 
 import 'package:flutter/services.dart';
 
+import './reader_modes.dart';
 import './exceptions.dart';
 import './messages.dart';
 
-enum NFCReaderMode { normal, foreground_dispatch }
-
 class NFC {
   static MethodChannel _channel = MethodChannel("nfc_in_flutter");
   static const EventChannel _eventChannel =
@@ -27,8 +26,12 @@ class NFC {
       /// should be thrown on iOS when the user clicks Cancel/Done.
       bool throwOnUserCancel = true,
 
-      /// TODO: Documentation
-      NFCReaderMode readerMode = NFCReaderMode.normal}) {
+      /// readerMode specifies which mode the reader should use. By default it
+      /// will use the normal mode, which scans for tags normally without
+      /// support for peer-to-peer operations, such as emulated host cards.
+      ///
+      /// This is ignored on iOS as it only has one reading mode.
+      NFCReaderMode readerMode = const NFCNormalReaderMode()}) {
     if (_tagStream == null) {
       _tagStream = _eventChannel.receiveBroadcastStream().where((tag) {
         // In the future when more tag types are supported, this must be changed.
@@ -101,20 +104,19 @@ class NFC {
       return controller.close();
     });
 
-    String mode;
-    switch (readerMode) {
-      case NFCReaderMode.normal:
-        mode = "normal";
-        break;
-      case NFCReaderMode.foreground_dispatch:
-        mode = "foreground_dispatch";
-        break;
-    }
     // Start reading
-    _channel.invokeMethod("startNDEFReading", {
-      "scan_once": once,
-      "reader_mode": mode,
-    });
+    try {
+      _channel.invokeMethod("startNDEFReading", {
+        "scan_once": once,
+        "reader_mode": readerMode.name,
+      });
+    } on PlatformException catch (err) {
+      controller.close();
+      if (err.code == "NFCMultipleReaderModes") {
+        throw NFCMultipleReaderModesException();
+      }
+      throw err;
+    }
 
     return controller.stream;
   }
diff --git a/lib/src/exceptions.dart b/lib/src/exceptions.dart
index 2d80ff3..2d2d911 100644
--- a/lib/src/exceptions.dart
+++ b/lib/src/exceptions.dart
@@ -7,6 +7,15 @@ class NDEFReadingUnsupportedException implements Exception {
   String toString() => "NDEF reading is not supported on this device";
 }
 
+/// NFCMultipleReaderModesException is thrown when multiple reading streams
+/// are open, but they use different reading modes. Only 1 reading mode can
+/// be used at the same time.
+class NFCMultipleReaderModesException implements Exception {
+  @override
+  String toString() =>
+      "started reading with a different reader mode than the one already in use";
+}
+
 /// NFCUserCanceledSessionException is thrown on iOS when the users cancels the
 /// reading session (Clicks OK/done).
 class NFCUserCanceledSessionException implements Exception {
diff --git a/lib/src/reader_modes.dart b/lib/src/reader_modes.dart
new file mode 100644
index 0000000..d774ef1
--- /dev/null
+++ b/lib/src/reader_modes.dart
@@ -0,0 +1,20 @@
+/// NFCReaderMode is an interface for different reading modes
+// The reading modes are implemented as classes instead of enums, so they could
+// support options in the future without breaking changes.
+abstract class NFCReaderMode {
+  String get name;
+}
+
+/// NFCNormalReaderMode uses the platform's normal reading mode. This does not
+/// allow reading from emulated host cards or other peer-to-peer operations.
+class NFCNormalReaderMode implements NFCReaderMode {
+  String get name => "normal";
+
+  const NFCNormalReaderMode();
+}
+
+/// NFCDispatchReaderMode allows reading from emulated host cards and other
+/// peer-to-peer operations by using different platform APIs.
+class NFCDispatchReaderMode implements NFCReaderMode {
+  String get name => "dispatch";
+}

From 5c08c18107692c648943fc0e0694977347f01cae Mon Sep 17 00:00:00 2001
From: Andi Semler <andirobinsemler@gmail.com>
Date: Sat, 6 Jul 2019 16:34:41 +0200
Subject: [PATCH 4/4] Revert readerMode in example

Formatting is crazy
---
 example/lib/main.dart | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/example/lib/main.dart b/example/lib/main.dart
index 40315b2..a242be0 100644
--- a/example/lib/main.dart
+++ b/example/lib/main.dart
@@ -25,28 +25,28 @@ class _MyAppState extends State<MyApp> {
   void _readNFC(BuildContext context) {
     try {
       // ignore: cancel_subscriptions
-      StreamSubscription<NDEFMessage> subscription =
-          NFC.readNDEF(readerMode: NFCDispatchReaderMode()).listen((tag) {
+      StreamSubscription<NDEFMessage> subscription = NFC.readNDEF().listen(
+          (tag) {
         // On new tag, add it to state
         setState(() {
           _tags.insert(0, tag);
         });
       },
-              // When the stream is done, remove the subscription from state
-              onDone: () {
+          // When the stream is done, remove the subscription from state
+          onDone: () {
         setState(() {
           _stream = null;
         });
       },
-              // Errors are unlikely to happen on Android unless the NFC tags are
-              // poorly formatted or removed too soon, however on iOS at least one
-              // error is likely to happen. NFCUserCanceledSessionException will
-              // always happen unless you call readNDEF() with the `throwOnUserCancel`
-              // argument set to false.
-              // NFCSessionTimeoutException will be thrown if the session timer exceeds
-              // 60 seconds (iOS only).
-              // And then there are of course errors for unexpected stuff. Good fun!
-              onError: (e) {
+          // Errors are unlikely to happen on Android unless the NFC tags are
+          // poorly formatted or removed too soon, however on iOS at least one
+          // error is likely to happen. NFCUserCanceledSessionException will
+          // always happen unless you call readNDEF() with the `throwOnUserCancel`
+          // argument set to false.
+          // NFCSessionTimeoutException will be thrown if the session timer exceeds
+          // 60 seconds (iOS only).
+          // And then there are of course errors for unexpected stuff. Good fun!
+          onError: (e) {
         setState(() {
           _stream = null;
         });