Run Activity from another app

Question

Is it possible to run an Activity from another app? I don’t want to call it through an Intent, something like this:

public class AnotherActivity extends com.otherapp.app.ActivityName
{
     // Aqui vai conter o código original da Activity
}

I know it is possible to do this with Nativeactivity by implementing the original methods within Activity and loading the . so library of the app. But the app in question does not have Nativeactivity.

My intention is to make a modification at runtime of the app, for example: Assuming that the other app’s Activity has the getIcon() method, overwriting it in my Anotheractivity(which is the same app’s Activity) I can change the app icon.