Add push notification functionality

android/app/build.gradle

@@ -8,7 +8,7 @@ if (localPropertiesFile.exists()) {
 
 def flutterRoot = localProperties.getProperty('flutter.sdk')
 if (flutterRoot == null) {
-    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
+    throw GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
 }
 
 def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
@@ -58,4 +58,7 @@ dependencies {
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'com.android.support.test:runner:1.0.2'
     androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+    implementation 'com.google.firebase:firebase-messaging:20.3.0'
 }
+
+apply plugin: 'com.google.gms.google-services'

android/app/src/main/AndroidManifest.xml

@@ -14,6 +14,7 @@
          FlutterApplication and put your custom class here. -->
     <application
         android:label="SpendTracker"
+        android:name=".Application"
         android:icon="@mipmap/ic_launcher">
 
         <meta-data

android/app/src/main/java/uk/co/localspend/localspend/Application.java

@@ -0,0 +1,21 @@
+package uk.co.localspend.localspend;
+
+import io.flutter.app.FlutterApplication;
+import io.flutter.plugin.common.PluginRegistry;
+import io.flutter.plugin.common.PluginRegistry.PluginRegistrantCallback;
+import io.flutter.plugins.GeneratedPluginRegistrant;
+import io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService;
+import io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin;
+
+public class Application extends FlutterApplication implements PluginRegistrantCallback {
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        FlutterFirebaseMessagingService.setPluginRegistrant(this);
+    }
+
+    @Override
+    public void registerWith(PluginRegistry registry) {
+        FirebaseMessagingPlugin.registerWith(registry.registrarFor("io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin"));
+    }
+}

android/build.gradle

@@ -5,7 +5,8 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.3.0'
+        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.google.gms:google-services:4.3.4'
     }
 }
 

android/gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.2-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.1.1-all.zip

lib/env/dev.json

@@ -1,5 +1,5 @@
 {
   "env": "DEV",
   "production": false,
-  "apiUrl": "https://dev.localspend.co.uk/api"
-}
+  "apiUrl": "https://localhost:/api"
+}

lib/main.dart

@@ -7,9 +7,12 @@ import 'package:local_spend/pages/spash_screen.dart';
 import 'package:local_spend/pages/more_page.dart';
 import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:local_spend/common/apifunctions/get_graph_data.dart';
+import 'package:firebase_messaging/firebase_messaging.dart';
 
 void main() {
-  runApp(MyApp());
+  runApp(
+      MyApp()
+  );
 }
 
 void loadGraphs() {}
@@ -22,27 +25,43 @@ class GraphWithTitle {
 }
 
 class MyApp extends StatelessWidget {
+  final FirebaseMessaging _firebaseMessaging = FirebaseMessaging();
   @override
   Widget build(BuildContext context) {
     // TODO: load graphs on app login and send to graph widgets
 
-    return new MaterialApp(
+    _firebaseMessaging.configure(
+      onMessage: (Map<String, dynamic> message) async {
+        print('onMessage: $message');
+      },
+      onLaunch: (Map<String, dynamic> message) async {
+        print('onLaunch: $message');
+      },
+      onResume: (Map<String, dynamic> message) async {
+        print('onResume: $message');
+      },
+    );
+
+    // Required on iOS; non-op on Android.
+    _firebaseMessaging.requestNotificationPermissions();
+
+    return MaterialApp(
       debugShowCheckedModeBanner: false,
       localizationsDelegates: [
         GlobalMaterialLocalizations.delegate,
         GlobalWidgetsLocalizations.delegate,
       ],
-      supportedLocales: [Locale("en")],
-      title: "Local Spend Tracker",
-      theme: new ThemeData(
+      supportedLocales: [Locale('en')],
+      title: 'Local Spend Tracker',
+      theme: ThemeData(
         primarySwatch: Colors.blueGrey,
       ),
       routes: <String, WidgetBuilder>{
-        "/HomePage": (BuildContext context) => HomePage(),
-        "/LoginPage": (BuildContext context) => LoginPage(),
+        '/HomePage': (BuildContext context) => HomePage(),
+        '/LoginPage': (BuildContext context) => LoginPage(),
         '/MapPage': (BuildContext context) => MapPage(),
-        "/ReceiptPage": (BuildContext context) => ReceiptPage2(),
-        "/MorePage": (BuildContext context) => MorePage(),
+        '/ReceiptPage': (BuildContext context) => ReceiptPage2(),
+        '/MorePage': (BuildContext context) => MorePage(),
       },
       home: SplashScreen(),
     );