isWrongInstance() for Android Main Activities

wrong_instance.java

/**
   * Dev tools and the play store (and others?) launch with a different intent, and so
   * lead to a redundant instance of this activity being spawned. <a
   * href="http://stackoverflow.com/questions/17702202/find-out-whether-the-current-activity-will-be-task-root-eventually-after-pendin"
   * >Details</a>.
   */
  private boolean isWrongInstance() {
    if (!isTaskRoot()) {
      Intent intent = getIntent();
      boolean isMainAction = intent.getAction() != null && intent.getAction().equals(ACTION_MAIN);
      return intent.hasCategory(CATEGORY_LAUNCHER) && isMainAction;
    }
    return false;
  }