Save settings on application close and restore settings on startup

In order to restore preferences upon application startup, you can use Android SharedPreferences class.

In onCreate metod call:

SharedPreferences sharedPref = getSharedPreferences("myprefs", 0);

// restore integer value, 1 - default
integer_value = sharedPref.getInt("integer_value", 1);

//same for the string value
string_value = sharedPref.getString("string_value", "this is a default value";

And in order to save values on application exit, write in onStop method:

SharedPreferences sharedPref= getSharedPreferences("myprefs", 0);
SharedPreferences.Editor editor= sharedPref.edit();

editor.putString("string_value", string_value);
editor.putInt("integer_value", integer_value);
editor.commit();

You can actually save other types of data also.

Also see these articles:
1. http://samir-mangroliya.blogspot.in/p/android-shared-preferences.html
2. http://developer.android.com/guide/topics/data/data-storage.html