Create Custom manifest Variables

android {
    defaultConfig {
        manifestPlaceholders = [hostName:"www.example.com"]
    }
    ...
}

Now you can use hostname as:

<intent-filter ... >
    <data android:scheme="https" android:host="${hostName}" ... />
    ...
</intent-filter>

Read More:

Manage manifest files  |  Android Studio  |  Android DevelopersAndroid Developers