FCM Service

app/build.gradle

@@ -38,4 +38,6 @@ dependencies {
 
     implementation platform('com.google.firebase:firebase-bom:29.2.1')
     implementation 'com.google.firebase:firebase-analytics'
+    implementation 'com.google.firebase:firebase-messaging'
+    implementation 'com.google.firebase:firebase-messaging-directboot'
 }

app/src/main/AndroidManifest.xml

@@ -9,8 +9,13 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.SMSGateway">
+        <service
+            android:name=".services.FCMService"
+            android:exported="false"
+            android:directBootAware="true">
+        </service>
         <activity
-            android:name="com.vernu.sms.MainActivity"
+            android:name="com.vernu.sms.activities.MainActivity"
             android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />

app/src/main/java/com/vernu/sms/MainActivity.java → app/src/main/java/com/vernu/sms/activities/MainActivity.java

@@ -1,4 +1,4 @@
-package com.vernu.sms;
+package com.vernu.sms.activities;
 
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.core.app.ActivityCompat;
@@ -15,6 +15,7 @@ import android.widget.Switch;
 import android.widget.Toast;
 
 import com.google.android.material.snackbar.Snackbar;
+import com.vernu.sms.R;
 
 public class MainActivity extends AppCompatActivity {
 

app/src/main/java/com/vernu/sms/services/FCMService.java

@@ -0,0 +1,80 @@
+package com.vernu.sms.services;
+
+import android.app.NotificationChannel;
+import android.app.NotificationManager;
+import android.app.PendingIntent;
+import android.content.Context;
+import android.content.Intent;
+import android.media.RingtoneManager;
+import android.net.Uri;
+import android.os.Build;
+
+import androidx.core.app.NotificationCompat;
+
+import com.google.firebase.messaging.FirebaseMessagingService;
+import com.google.firebase.messaging.RemoteMessage;
+import com.vernu.sms.R;
+import com.vernu.sms.activities.MainActivity;
+
+
+public class FCMService extends FirebaseMessagingService {
+
+    private static final String TAG = "MyFirebaseMsgService";
+    private static final String DEFAULT_NOTIFICATION_CHANNEL_ID = "N1";
+
+    @Override
+    public void onMessageReceived(RemoteMessage remoteMessage) {
+
+        // Check if message contains a data payload.
+        if (remoteMessage.getData().size() > 0) {
+            sendNotification("data msg", "msg boody");
+        }
+
+        // Check if message contains a notification payload.
+        if (remoteMessage.getNotification() != null) {
+            sendNotification("notif msg", "msg body");
+        }
+
+    }
+
+    @Override
+    public void onNewToken(String token) {
+        sendRegistrationToServer(token);
+    }
+
+    private void sendRegistrationToServer(String token) {
+
+    }
+
+    /* build and show notification */
+    private void sendNotification(String title, String messageBody) {
+        Intent intent = new Intent(this, MainActivity.class);
+        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
+        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
+                PendingIntent.FLAG_ONE_SHOT);
+
+        String channelId = DEFAULT_NOTIFICATION_CHANNEL_ID;
+        Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
+        NotificationCompat.Builder notificationBuilder =
+                new NotificationCompat.Builder(this, DEFAULT_NOTIFICATION_CHANNEL_ID)
+                        .setSmallIcon(R.drawable.ic_launcher_foreground)
+                        .setContentTitle(title)
+                        .setContentText(messageBody)
+                        .setAutoCancel(true)
+                        .setSound(defaultSoundUri)
+                        .setContentIntent(pendingIntent);
+
+        NotificationManager notificationManager =
+                (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
+
+        // Since android Oreo notification channel is needed.
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            NotificationChannel channel = new NotificationChannel(channelId,
+                    "Channel human readable title",
+                    NotificationManager.IMPORTANCE_DEFAULT);
+            notificationManager.createNotificationChannel(channel);
+        }
+
+        notificationManager.notify(0 /* ID of notification */, notificationBuilder.build());
+    }
+}

app/src/main/res/layout/activity_main.xml

@@ -4,7 +4,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    tools:context=".MainActivity">
+    tools:context=".activities.MainActivity">
 
     <Switch
         android:id="@+id/gatewaySwitch"