Ackermann Function AsyncTask

Application calculates value of Ackermann function using AsyncTask. Common problem of AsyncTask such as view leaking, configuration change handling are solved via retain fragment, design principles (SOLID).

Ackermann function values is calculated recursively:

Usage

Action	Screenshot
Start application
Calculation process
Calculation result
Stack overflow error result
Wrong arguments error result

References

Android developers documentation:

• AsyncTask - https://developer.android.com/reference/kotlin/android/os/AsyncTask
• Handling configuration changes with fragments - https://www.androiddesignpatterns.com/2013/04/retaining-objects-across-config-changes.html

Java documentation:

• WeakReference - https://docs.oracle.com/javase/7/docs/api/java/lang/ref/WeakReference.html

Ackermann function description:

• https://en.wikipedia.org/wiki/Ackermann_function
• https://studbooks.net/2195922/matematika_himiya_fizika/funktsiya_akkermana