我已经看过了很多的android教程在互联网上。在这些教程中，他们使用了这上下文语境无处不在。我知道这关键字意味着在Java中，但我不能让这种平等，在Android上这关键词编程。例如，在 AlertDialog.Builder ，在developer.android.com现场，只有一个在参数上下文的参考，但我无法了解这是什么这这里的意思。

I have looked at a lot of android tutorials over the internet. In these tutorials they use the this context for the context everywhere. I know what this keyword means in Java, but I can't make equal this, with the this keyword in Android programming. For example, at AlertDialog.Builder, on the developer.android.com site, there is only one reference at the parameters to the Context, but I can't learn what this this means here.

推荐答案

如果你有一个活动，您可以使用这，因为：

if you have an Activity you can use this because:

所以你可以使用你当前活动的上下文。

so you can use your current Activity as a Context.

看这里的Acitivty文档： http://developer.android.com/reference/android/app/Activity.html

Look here for the Acitivty doc: http://developer.android.com/reference/android/app/Activity.html

和这里的解释这： http://download.oracle.com/javase/tutorial/java/javaOO/thiskey.html