// Get data back from child activity.
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode != RESULT_OK) {
      return;
    }

    String id = data.getStringExtra(Constants.KEY_ID);
    String subject = data.getStringExtra(Constants.KEY_SUBJECT);
    String body = data.getStringExtra(Constants.KEY_BODY);
    String url = data.getStringExtra(Constants.KEY_URL);
    float rating = data.getFloatExtra(Constants.KEY_RATING, 0);
    boolean isWatched = data.getBooleanExtra(Constants.KEY_IS_WATCHED, false);

    // When returning from Editor Screen, add/update a movie in the list.
    if (requestCode == REQUEST_EDITOR) {
      if (id.equals(Constants.VALUE_NEW_MOVIE)) {
        // New Movie in list.
        Movie movie = new Movie(subject, body, url, rating, isWatched);
        mMovies.add(movie);

        // Add to file.
        FileManager.addToFile(this, FILE_NAME, movie);
      } else {
        int position = data.getIntExtra(Constants.KEY_POSITION, -1);
        // Update the movie in list at id position.
        Movie movie = mMovies.get(position);
        movie.setSubject(subject);
        movie.setBody(body);
        movie.setUrl(url);
        movie.setRating(rating);
        movie.setIsWatched(isWatched);

        // Rewrite the file.
        FileManager.saveFile(this, FILE_NAME, mMovies);
      }
    }
    // On returning from Search screen, add new movie in the list.
    else if (requestCode == REQUEST_SEARCH) {
      // New Movie in list.
      Movie movie = new Movie(id, subject, body, url);
      movie.setRating(rating);
      mMovies.add(movie);

      // Add to file.
      FileManager.addToFile(this, FILE_NAME, movie);
    }

    mMainListAdapter.notifyDataSetChanged();
  }