使用＆QUOT;这＆Q​​UOT;与类名 [英] Using "this" with class name

问题描述

我做机器人编程，并学习意图，当我看到一个构造函数，我的C＃训练有素的头脑，显得时髦。该电话是：

I am doing Android programming and was learning about Intents, when I saw a constructor that, to my C# trained mind, seemed funky. The call was:

Intent myIntent = new Intent(CurrentActivity.this, NextActivity.class);

这两个参数是新的我。如何有一个静态的。这个关的类名？这是一个Java的东西或Android的事吗？我猜想，这是一样的只是说这个，因为我在 CurrentActivity 的背景下，但我不明白怎么这个可取消了类名本身。也。 .class的看起来是用来思考，而我熟悉C＃，但是任何洞察到这将受到欢迎也是如此。

Both of the parameters are new to me. How is there a static ".this" off of a Class Name? Is this a Java thing or an Android thing? I am assuming that it is the same as just saying "this", since I am in the context of CurrentActivity, but I don't get how the "this" can be called off of the Class name itself. Also. The ".class" looks like it is used for reflection, which I am familiar with in C#, but any insight into this would be welcomed as well.

感谢。

推荐答案

通常情况下，你只能使用这。但是，有时这引用了一个内部​​类......所以，例如：

Usually, you can use only this. But, sometimes this makes reference to an inner class... so, for example:

Button button = (Button)findViewById(R.id.ticket_details_sell_ticket);
button.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
        // it will be wrong to use only "this", because it would
        // reference the just created OnClickListener object
        Intent login = new Intent(ClassName.this, Login.class);
        startActivityForResult(login, LOGIN_REQUEST);
    }
});

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