Work in progress...

1_before.java

public class MyActivity extends Activity {
  private static final String STATEFUL_COUNT = “count”;

  private int count;

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

    if (savedInstanceState != null) {
      count = savedInstanceState.getInt(STATEFUL_COUNT);
    } else {
      count = 1;
    }
    
    ... normal activity stuff ...
  }

  @Override
  public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.put(STATEFUL_COUNT, count);
  }
}

2_after.java

public class MyActivity extends Activity {
  
  @Stateful(initial=1) 
  private int count;

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

    ... normal activity stuff (state has already been restored) ...
  }
}

3_ideal_injection points.txt

It is save to ignore this file if you are just reading sample code!!!

onCreate(savedInstanceState) {
  super.onCreate(savedInstanceState)
  (( "injected" state magic ))
  ... useful implementation
}

onSaveInstanceState(out) {
  super.onSaveInstanceState(out)
  (( "injected" state magic ))
  ... optional interesting implementation (otherwise explicit onSaveInstanceState is not required)
}

4_probable_injection points.txt

It is save to ignore this file if you are just reading sample code!!!

(( "injected" state magic ))
onCreate(savedInstanceState) {
  super.onCreate(savedInstanceState)
  ... useful implementation
}

onSaveInstanceState(out) {
  super.onSaveInstanceState(out)
  ... optional interesting implementation (otherwise explicit onSaveInstanceState is not required)
}
(( "injected" state magic )) <-- Not perfect due to potential of state clobbering.