In general that shouldn't be allowed. I believe on the latest versions of Android, both apps need to explicitly set which apps may have visibility of each-other

In general that shouldn't be allowed. I believe on the latest versions of Android, both apps need to explicitly set which apps may have visibility of each-other. I think you can apply to Google to bless your app with visibility of all installed apps, but I think that's limited to things that need extra security. The banking app could qualify for that. https://developer.android.com/training/package-visibility https://developer.android.com/training/package-visibility