仅在第二次访问活动时才发生OnResume

Question

I am trying to write code for my android application for things to happen when the activity is Resumed. Although I only want this stuff to happen when the activity is re-visited for the second time and not the first time.

So I want the user to do what they need in the onCreate method in their first visit to the activity and then when they go back to the activity then the onResume code happens.

Should I be using a different method or how can I achieve what I am looking to do?

public void onResume(){
    super.onResume();

    RunningStatus = sharedPreferences.getBoolean("RunningStatus", false);

    if (isS1Pressed) {
        if (isPressed) {
            if (RunningStatus = false) {
                pause.setBackgroundResource(R.drawable.start);
            }
        }
    }

EDIT:

I don't mean second time I mean every time after. Basically I have a production line and my app determines whether it is ahead or behind. So when the user enters this activity then the can perform the calculation. We have a pause button where the user can pause the line if the production line has been stopped in real life. Although I would like that the user can then go out of that specific production line and do calculations on other lines too. Although at the minute once I leave the activity I lose all its state.

Thanks

Answer 1

You could use a boolean flag. in onResume eg

if (secondVisit) {
  ...
} else secondVisit = true;

Answer 2

If you want to do some stuff for very specific time (only 2nd, not 1st or 3rd, 4th,...), I suggest you should use some counter variable and use activity method onSaveInstanceState() and onRestoreInstanceState() to store and retrieve. If you don't want to reset the counter when app got killed, use data persist like SharePreference to store counter.

Answer 3

i assume that you have gone through the activity life cycle if not then visit https://developer.android.com/guide/components/activities/activity-lifecycle

boolean secondUse=false;//this should be a field in the activity class

onRestart() method is called only when we visited the activity and and came back and then we visit(ie when the activity already in the activity stack).

if you have other use case, then using sharedPreference would be better.

override the onRestart() inside it write the following

if(!seconduse){
//do your stuff
secondUse=true;
}

as you said in the edit you need the stuff to work on every visit after first visit then simply put your code in onRestart() method

public void onRestart(){
super.onRestart();

RunningStatus = sharedPreferences.getBoolean("RunningStatus", false);
   if (isS1Pressed) {
    if (isPressed) {
        if (RunningStatus = false) {
            pause.setBackgroundResource(R.drawable.start);
        }
    }
   }
}