Android Domain and Coding | Dataford Interview Questions

Explain the Android domain concepts and programming challenges you expect to handle in a mobile engineering interview.

For the coding portion, implement a validator for an Android Activity callback sequence. Return True only when every callback follows the simplified lifecycle transition rules below. The function accepts a list of callback names and returns a Boolean.

onCreate starts the Activity. Valid transitions are onCreate to onStart or onDestroy, onStart to onResume or onStop, onResume to onPause, onPause to onResume or onStop, and onStop to onRestart or onDestroy. onRestart must transition to onStart; onDestroy is terminal.

Constraints

0 <= events.length <= 10^4
Each event is a string
Recognized callbacks are onCreate, onStart, onResume, onPause, onStop, onRestart, and onDestroy
The empty sequence is invalid
An Activity instance cannot transition after onDestroy

Function Signature

def is_valid_activity_lifecycle(events):

Your question is Android Domain and Coding. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.

Problem

Explain the Android domain concepts and programming challenges you expect to handle in a mobile engineering interview.

Constraints

0 <= events.length <= 10^4
Each event is a string
Recognized callbacks are onCreate, onStart, onResume, onPause, onStop, onRestart, and onDestroy
The empty sequence is invalid
An Activity instance cannot transition after onDestroy

Function Signature

def is_valid_activity_lifecycle(events):

Your question is Android Domain and Coding. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.