Application Tag in manifest show me [App is not indexable by Google Search; consider adding at least one Activity with an ACTION-VIEW intent filter]

Question

i'm trying to add notification service in my application after add same line like service in manifest .... Tag Application show me this messegs i don't have any idea what suppose to mean this messege ,

  <?xml version="1.0" encoding="utf-8"?>
  <manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="ddd">
  <uses-permission android:name="android.permission.INTERNET" />
  <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
  <application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <meta-data
      android:name="com.google.firebase.messaging.default_notification_icon"
        android:resource="@mipmap/animal" />
    <meta-data
     android:name="com.google.firebase.messaging.default_notification_color"
        android:resource="@color/colorPrimary" />
    <activity
        android:name=".Splashscreen"
        android:configChanges="orientation|screenSize"
        android:screenOrientation="portrait"
        android:windowSoftInputMode="adjustResize"
        android:label="@string/app_name"
     android:theme="@android:style/Theme.Holo.Light.NoActionBar.Fullscreen">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:configChanges="orientation|screenSize"
        android:screenOrientation="portrait"
        android:windowSoftInputMode="adjustResize"
        android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>
    <service
        android:name=".MyFirebaseMessagingService">
        <intent-filter>
            <action android:name="com.google.firebase.MESSAGING_EVENT"/>
        </intent-filter>
    </service>
  </application>
  </manifest>

Answer 1

Your Solution is here

You can't write below code within multiple activity tag as per google index.

So, remove this code from all activity tags and just type it once on the main activity tag

<intent-filter>
      <action android:name="android.intent.action.MAIN" />
      <category android:name="android.intent.category.DEFAULT" />
</intent-filter>