1、连接视图与数据、数据封装；

2、视图构造与配置；

3、数据更新监听；

4、视图重用机制。

 

* An Adapter object acts as a bridge between an {@link AdapterView} and the
* underlying data for that view. The Adapter provides access to the data items.
* The Adapter is also responsible for making a {@link android.view.View} for
* each item in the data set.

 

/**
 * Extended {@link Adapter} that is the bridge between a {@link ListView}
 * and the data that backs the list. Frequently that data comes from a Cursor,
 * but that is not
 * required. The ListView can display any data provided that it is wrapped in a
 * ListAdapter.
 */
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