Show notifications in foreground

app/src/main/AndroidManifest.xml

@@ -8,6 +8,7 @@
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
+    <uses-permission android:name="android.permission.VIBRATE" />
 
     <application
         android:allowBackup="true"

app/src/main/java/app/insti/InstiAppFirebaseMessagingService.java

 package app.insti;
 
+import android.app.Notification;
+import android.app.PendingIntent;
+import android.content.Intent;
+import android.os.Bundle;
+import android.support.v4.app.NotificationCompat;
+import android.support.v4.app.NotificationManagerCompat;
+import android.util.Log;
+
 import com.google.firebase.messaging.FirebaseMessagingService;
 import com.google.firebase.messaging.RemoteMessage;
 
+import java.util.Map;
+
+import app.insti.activity.MainActivity;
+
 public class InstiAppFirebaseMessagingService extends FirebaseMessagingService {
     @Override
     public void onNewToken(String s) {
@@ -10,9 +22,66 @@ public class InstiAppFirebaseMessagingService extends FirebaseMessagingService {
         super.onNewToken(s);
     }
 
+    /** Convert a string to string map to a bundle */
+    private Bundle stringMapToBundle(Map<String, String> map) {
+        Bundle bundle = new Bundle();
+        for (Map.Entry<String, String> entry : map.entrySet()) {
+            bundle.putString(entry.getKey(), entry.getValue());
+        }
+        return bundle;
+    }
+
+    /** Get a PendingIntent to open MainActivity from a notification message */
+    private PendingIntent getNotificationIntent(RemoteMessage remoteMessage) {
+        Intent intent = new Intent(this, MainActivity.class);
+        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
+        intent.putExtra(Constants.MAIN_INTENT_EXTRAS, stringMapToBundle(remoteMessage.getData()));
+        return PendingIntent.getActivity(this, 0, intent, 0);
+    }
+
     @Override
     public void onMessageReceived(RemoteMessage remoteMessage) {
-        /* For future functionality */
+        String TAG = "NOTIFICATION";
+        String channel = getResources().getString(R.string.default_notification_channel_id);
+
+        // Check if message contains a data payload.
+        if (remoteMessage.getData().size() > 0) {
+            Log.wtf(TAG, "Message data payload: " + remoteMessage.getData());
+            String isData = remoteMessage.getData().get("is_data");
+            if (isData != null && isData.equals("true")) {
+                // TODO: Implement this
+            } else {
+                /* Get data */
+                String title = remoteMessage.getNotification().getTitle();
+                String body = remoteMessage.getNotification().getBody();
+                Integer notification_id;
+                try {
+                    notification_id = Integer.parseInt(remoteMessage.getData().get(Constants.FCM_BUNDLE_NOTIFICATION_ID));
+                } catch (NumberFormatException ignored) {
+                    return;
+                }
+
+                /* Check malformed notifications */
+                if (title == null || body == null) { return; }
+
+                /* Build notification */
+                Notification notification = new NotificationCompat.Builder(this, channel)
+                        .setSmallIcon(R.drawable.ic_lotusgray)
+                        .setColor(getResources().getColor(R.color.colorPrimary))
+                        .setContentTitle(title)
+                        .setContentText(body)
+                        .setContentIntent(getNotificationIntent(remoteMessage))
+                        .setVibrate(new long[]{0, 400})
+                        .setAutoCancel(true)
+                        .setPriority(NotificationCompat.PRIORITY_DEFAULT)
+                    .build();
+
+                /* Show notification */
+                NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);
+                notificationManager.notify(notification_id, notification);
+            }
+        }
+
         super.onMessageReceived(remoteMessage);
     }
 }