Fixed notifcation when resuming app. Updated docs.

Author: phongcao

android/src/main/java/com/azure/reactnative/notificationhub/ReactNativeFirebaseMessagingService.java

@@ -16,12 +16,9 @@ public class ReactNativeFirebaseMessagingService extends FirebaseMessagingServic
     private static final String TAG = "ReactNativeFMS";
 
     private static ReactNativeNotificationsHandler notificationHandler;
-    private static Context appContext;
     private static String notificationChannelID;
 
     public static void createNotificationHandler(Context context) {
-        appContext = context;
-
         if (notificationHandler == null) {
             notificationHandler = new ReactNativeNotificationsHandler();
             NotificationHubUtil notificationHubUtil = NotificationHubUtil.getInstance();
@@ -63,15 +60,14 @@ public void onNewToken(String token) {
 
     @Override
     public void onMessageReceived(RemoteMessage remoteMessage) {
-        Log.d(TAG, "From: " + remoteMessage.getFrom());
+        Log.d(TAG, "Remote message from: " + remoteMessage.getFrom());
 
         if (notificationHandler == null) {
-            Log.e(TAG, "Notification handler hasn't been created");
-            return;
+            createNotificationHandler(this);
         }
 
         Bundle bundle = remoteMessage.toIntent().getExtras();
-        notificationHandler.sendNotification(appContext, bundle, notificationChannelID);
-        notificationHandler.sendBroadcast(appContext, bundle, 0);
+        notificationHandler.sendNotification(this, bundle, notificationChannelID);
+        notificationHandler.sendBroadcast(this, bundle, 0);
     }
 }

docs/android-installation.md

@@ -167,6 +167,15 @@ On the [Azure Portal](https://portal.azure.com) page for your notification hub,
 The example below shows how you can register and unregister from Azure Notification Hub in your React component.
 
 ```js
+import React, { Component } from 'react';
+import { NativeEventEmitter } from 'react-native';
+import {
+  StyleSheet,
+  Text,
+  TouchableOpacity,
+  View,
+} from 'react-native';
+
 const NotificationHub = require('react-native-azurenotificationhub');
 const PushNotificationEmitter = new NativeEventEmitter(NotificationHub);
 
@@ -193,7 +202,7 @@ class myapp extends Component {
     PushNotificationEmitter.addListener(NOTIF_REGISTER_AZURE_HUB_EVENT, this._onAzureNotificationHubRegistered);
     PushNotificationEmitter.addListener(NOTIF_AZURE_HUB_REGISTRATION_ERROR_EVENT, this._onAzureNotificationHubRegistrationError);
 
-   NotificationHub.register({
+    NotificationHub.register({
       connectionString,
       hubName,
       senderID,
@@ -243,5 +252,25 @@ class myapp extends Component {
   _onRemoteNotification(notification) {
     // Note notification will be a JSON string for android
     console.warn('Notification received: ' + notification);
-  }  
+  }
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    justifyContent: 'center',
+    alignItems: 'center',
+    backgroundColor: '#F5FCFF',
+  },
+  welcome: {
+    fontSize: 20,
+    textAlign: 'center',
+    margin: 10,
+  },
+  instructions: {
+    textAlign: 'center',
+    color: '#333333',
+    marginBottom: 5,
+  },
+});
 ```