Broadcast receiver with activity inheritance

Question

I have a question. I have 2 activities in each I initialize the broadcast receiver to obtain internet connection changes. After changes are received, I notify the user about it by displaying some text on the screen.

In order not to write the code several times, I created BroadcastActivity that inherits from AppCompatActivity.

Now I pass views with super() to BroadcastActivity and manipulate with views (Change texts, visibilities etc.).

Question is: Is it best practice to do so or is there a more elegant solution? And if it can lead to memory leaks?

Thank you for your help!

Example of BroadcastActivity

open class BroadcastActivity : AppCompatActivity(), OnConnectionChangeListener {
    //some code
}

And example of activity (Secondary activity structure similar to this)

public class MainActivity extends BroadcastActivity{
    //some code
}

P.S. BroadcastActivity written on Kotlin and MainActivity on Java.

P.S. 2 At this moment I can't switch to single activity and looking for temporary solution.