title: FCM not receiving notification messages
body: <p>I have my manifest in check, my services in check, my dependencies in check, class variables in check and still no notifications on my device. I'm using my computer to send firebase cloud messages and I should be receiving them on my android phone. However,my android phone is not picking up the notifications. And yes, my android device is in the background as I send the message. Anyone know what my problem is?</p>
  
  <p>Here's the source code:</p>
  
  <p><strong>My Service</strong></p>
  
  <pre><code>public class FirebaseIDMessage extends FirebaseMessagingService {
  
      private static final String TAG = "FirebaseIDMessage";
  
  
      @Override
      public void onNewToken(String s) {
          super.onNewToken(s);
          String token = s;
          Log.d(TAG, "Registered token: = " + token);
  
          sendRegistrationToServer(token);
      }
  
  
      private void sendRegistrationToServer(String token){
  
      }
  }
  </code></pre>
  
  <p><strong>My Manifest File</strong></p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.messaging"&gt;
  
     &lt;uses-permission android:name="android.permission.INTERNET" /&gt;
  
         &lt;application
          android:allowBackup="true"
          android:icon="@mipmap/ic_launcher"
          android:label="@string/app_name"
          android:roundIcon="@mipmap/ic_launcher_round"
          android:supportsRtl="true"
          android:theme="@style/AppTheme"&gt;
  
          &lt;!-- Services --&gt;
          &lt;service android:name=".FirebaseIDMessage"
              android:enabled="true"
              android:exported="true"&gt;
              &lt;intent-filter&gt;
                  &lt;action android:name="com.google.firebase.MESSAGING_EVENT"/&gt;
              &lt;/intent-filter&gt;
          &lt;/service&gt;
  
          &lt;activity android:name=".MessagingActivity"&gt;
              &lt;intent-filter&gt;
                  &lt;action android:name="android.intent.action.MAIN" /&gt;
  
                  &lt;category android:name="android.intent.category.LAUNCHER" /&gt;
              &lt;/intent-filter&gt;
          &lt;/activity&gt;
  
      &lt;/application&gt;
  
  &lt;/manifest&gt;
  </code></pre>
  
  <p><strong>My Activity</strong></p>
  
  <pre><code>public class MessagingActivity extends AppCompatActivity {
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_messaging);
      }
  }
  </code></pre>