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private static final String SOME_KEY = "KEY_ANYTHING_YOU_WANT"

public class Preference {
  // Set Prefrence
  SharedPreferences.Editor e = PreferenceManager.getDefaultSharedPreferences(context).edit();
  e.putBoolean(SOME_KEY, true);
  e.apply(); 
  
  // Get Preference
  return PreferenceManager.getDefaultSharedPreferences(context).getBoolean(SOME_KEY, false);
}