如何从父类中调用孩子的方法? [英] How do I call a child's method from the parent class?

问题描述

假设我有一个 ChildFragment 类，它是从 ParentFragment 继承的.目的是让几个带有按钮的活动"和片段"通常由一个 ParentFragment 处理.

Let's say I have a class, ChildFragment that inherits from a ParentFragment. The purpose is to have several Activities and Fragments with buttons that are commonly used handled by one ParentFragment.

当用户按下刷新按钮时，它将在ParentFragment中调用refresh()函数.但是，实际上下载此文件的操作由ChildFragment处理，因为每个片段都有不同的内容.因此，只要refresh()完成，我希望此ParentFragment在子级中调用某些东西.

When the user presses a refresh button, it will call a refresh() function in the ParentFragment. However, the action of actually downloading this file is handled by the ChildFragment, because every fragment has different content. So I want this ParentFragment to call something in the child, whenever the refresh() is done.

我该怎么做?或者，如果有更好的方法，这样做也有帮助.

How can I do this? Or if there is a better way of doing it, it would help too.

推荐答案

您需要在子片段中覆盖refresh方法.

You need to override the refresh method in child fragments.

public class PFragment extends Fragment{
  protected void refresh(){
    //Common stuff here
  }
}

在子类ovveride中的刷新方法

In child class ovveride the refresh method

public class CFragment extends PFragment{
 public void onClick(){
  super.refresh();
 }

@Override
protected void refresh(){
 //Custom stuff here
}

}

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