Android: how to call method only on installation of App

Question

I need to call a method (or start an activity, or something else) that will update a file containing data the app needs.

But I want it to be done only once, when the

Answer 1

to do something only once in app you need something like this :

boolean mboolean = false;

SharedPreferences settings = getSharedPreferences("PREFS_NAME", 0);
mboolean = settings.getBoolean("FIRST_RUN", false);
if (!mboolean) {
 // do the thing for the first time 
  settings = getSharedPreferences("PREFS_NAME", 0);
                    SharedPreferences.Editor editor = settings.edit();
                    editor.putBoolean("FIRST_RUN", true);
                    editor.commit();                    
} else {
 // other time your app loads
}