从父母那里获得孩子的班级名称 [英] Get child class name from parent

问题描述

我有一个我自己的所有活动(ActivityBase)的基类，而这些活动本身是从android.app.Activity派生的.在onCreate中，我想基于当前正在执行的子类执行一些条件逻辑.如果SomeCustomActivity和AnotherCustomActivity都扩展了ActivityBase，如何在父类(ActivityBase)中确定当前执行的是哪两个?

I have a base class for my all of activities (ActivityBase) that itself derives from android.app.Activity. In onCreate I want to execute some conditional logic based on the currently executing child class. If SomeCustomActivity and AnotherCustomActivity both extend ActivityBase, how can I determine in the parent class (ActivityBase) which of the two is the currently executing one?

推荐答案

使用 instanceof 运算符.

假设您有一个基类和两个名为Base，SubOne和SubTwo的子类，如果要检查变量ref是SubOne还是SubTwo的实例，说:

Supposing you have a base class and two subclasses named Base, SubOne and SubTwo, if you want to check if a variable ref is an instance of SubOne or SubTwo you'd say:

if(ref instanceof SubOne){
}
else if(ref instanceof SubTwo){
}

请注意:尽管(ref instanceof Base)始终会返回true.

Note that: (ref instanceof Base) will always return true though.

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