Recette n 07 Comment naviguer entre les fentres ? 
Page 19

@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
   if(savedInstanceState != null) {
      tf.setText(savedInstanceState.getString("text field 1", "");
   }
   super.onRestoreInstanceState(savedInstanceState);
}

@Override
protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);

   if(savedInstanceState != null) {
      tf.setText(savedInstanceState.getString("text field 1", "");
   }
   // ...
}
