android - How to detect the presence of another app? -

This is a theoretical condition:

• I write an app to detect presence
• The square path, name, activity name, etc. of the target app are random, I can not just check that it is there (it is i.e.
• I have root access on the phone
• App is an open source, and (different than package names and app names) <
• App does not generate any log output Does it .

  I'm thinking about ways to find out whether this second app is present on the phone or not it is actually running from time to time), what are the following methods Are all possible?

  • Note from time to time for the presence of certain classes in memory
  • Find the known segments code compiled into each installed APK
  • Fixed Detecting the memory of the device while monitoring the memory of the device detects

    Are there other ways to find another app in these situations?

    Use the rest of this method about all installed applications in the system:.