Android的多项活动访问一个Java类 [英] Android multiple activities access one java class

问题描述

我是新android开发和AP preciate任何帮助。
我有一个要访问一个Java类的多个机器人的活动。此类已同步的getter和setter方法​​，但我有使整个活动这个类的一个实例的问题。有什么办法可以轻松地做到这一点？

I am new to android development and appreciate any help. I have multiple android activities that have to access one java class. This class has synchronized getters and setters, but I'm having problems making a single instance of this class across the activities. Is there any way to easily do this?

推荐答案

您需要的是一个'单身' 模式：

public final class Singleton {
    private final static Singleton ourInstance = new Singleton();
    public static Singleton getInstance() {
        return ourInstance;
    }

    // Contructor is private, so it won't be possible 
    // to create instance of this class from outside of it.
    private Singleton() {
    }
}

现在在你的子类，只需使用：

Now in your child classes, just use:

Singleton.getInstance()

要访问一个，这个类的一个对象。

to access one, single object of this class.

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