[android] Android - Adding at least one Activity with an ACTION-VIEW intent-filter after Updating SDK version 23

I am getting the following tool tip in AndroidManifest.xml:

App is not indexable by Google Search; consider adding at least one Activity with an ACTION-VIEW intent-filler. See issue explanation for more details.

Adds deep links to get your app into the Google index, to get installs and traffic to your app from Google Search.

Can anyone explain why it is so?

You can remove the warning by adding the below code in <intent-filter> inside <activity>

<action android:name="android.intent.action.VIEW" />

Adding this intent filter to one of the activities declared in app manifest fixed this for me.

<activity
    android:name=".MyActivity"
    android:screenOrientation="portrait"
    android:label="@string/app_name">

    <intent-filter>

       <action android:name="android.intent.action.VIEW" />

    </intent-filter>

</activity>

this solution work only .if your want to ignore this Warning

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    tools:ignore="GoogleAppIndexingWarning"
    package="com.example.saloononlinesolution">

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.example.app"
tools:ignore="GoogleAppIndexingWarning">

You can remove the warning by adding xmlns:tools="http://schemas.android.com/tools" and tools:ignore="GoogleAppIndexingWarning" to the <manifest> tag.