扩展Activity和扩展ListActivity有什么区别? [英] What are the differences between extending Activity and extending ListActivity?

问题描述

我正在使用一个扩展Activity的类来从API获取列表...

I am using a class which extends Activity to obtain a list from an API...

在一些基本相同的应用中，开发人员扩展了ListActivity ...

In some apps which do basically the same, the devs extended ListActivity...

有哪些区别?

推荐答案

ListActivity通过提供一些免费"的以列表为中心的功能扩展了常见的android.app.Activity的功能.例如，列表条目单击的处理完全包含在ListActivity的onListItemClick(...)中，而如果使用的是普通android.app.Activity，则需要使用OnClickListener和实现手动实现.

ListActivity extends the functionality of the common android.app.Activity by providing a number of list centric features 'for-free' if you like. For example, the handling of a list entry click is neatly contained within ListActivity's onListItemClick(...) whereas if you were using a plain android.app.Activity then you would need to implement this manually with an OnClickListener and implementation.

对于所有帐户，如果布局包含列表，则使用ListActivity/ListFragment，因为它是有用的扩展.这并不意味着您的整个屏幕布局都必须是列表，而是其中的一部分必须托管一个标识符为id="@android:id/list"的ListView小部件.

By all accounts, if your layout contains a list then use a ListActivity/ListFragment since it is a useful extension. It does not mean your whole screen layout has to be list but a portion of it has to host a ListView widget with identifier, id="@android:id/list".

可以在此处找到有关该类的Javadoc以及有关如何使用它的有用示例.

The Javadoc on the class with useful examples of how to use it can be found here.

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