CountdownTimer: How to restart from a remaining time when the user goes back to the previous activity?

Question

I'm beginner in Android and it might be really basic question. I'm trying to create a CountDownTimer which keeps countdown between two activities. Users can go to the Activity B and go back to Activity A from Activity B. And I am thinking of saving the remaining time in SharedPreferences. What I want to know is when the user does OnBackPressed and save the current remaining time into SharedPreferences and goes back to the previous activity, how can I restart the countdown timer from the remaining time in previous activity?

Answer 1

I think this method should help you:

@Override
public void onResume() { // This will be trigger when your activity is created or come to front
    // Load preference
    // Start timer
}

@Override
public void onStop() { // This will be triggered when your activity goes behind or before your activity destroyed.
   // Cancel timer
   // Save preference
}

It's really simple, just follow the comments. Let me know if this helps