如何随机开始活动？

Question

我希望在 android studio 中随机启动活动而不重复。我希望能够通过单击按钮并在“if”语句中随机启动一项活动。谁能提供帮助，那就太棒了！谢谢。

Answer 1

   ArrayList<Class> activities = new ArrayList<>();


  @Override
  public void onCreate(Bundle savedInstanceState) {
       //your codes...
       activities.add(History.class);
       activities.add(Bookmark.class);
       activities.add(Themes.class);  

       //your codes

   }



public void openActivity(Class class_) {
    Intent intent = new Intent(this, class_);
    startActivity(intent);
}

public void openRandomActivity(){

    Class that = activities.get(new Random().nextInt(activities.size()));

    activities.remove(that); // after using, remove from list

    openActivity(that);
}

当用户点击按钮时调用openRandomActivity。