Android: Saving and Restoring data when switching between Activities

Question

I am trying to save some data in \"MainActivity\" when switching to another activity, and restoring that data as I switch back to it.

In \"MainActivity\": (restoring

Answer 1

You can use onRestoreInstanceState() witch is called after onStart(), whereas onCreate() is called before onStart().

Use the put methods to store values in onSaveInstanceState():

protected void onSaveInstanceState(Bundle bundle) {
  super.onSaveInstanceState(bundle);
  bundle.putInt("value", value);
}

And restore the value in onCreate():

public void onCreate(Bundle bundle) {
  if (bundle!= null){
    value = bundle.getInt("value");
  }
}