The operation of reading from a file is very straight forward, we open a file stream, create an array to hold the data, and finally read all the data into the array.

从文件中读取内容的操作是非常直截了当的：我们打开一个文件流对象，创建一个数组来放置数据，最后把所有数据都读到这个数组中。

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There are several implementations of the Adapter class, for specific tasks, such as the CursorAdapter for reading database data from a Cursor, or an ArrayAdapter for reading from an arbitrary array.

针对特定的任务有着很多不同的Adapter类实现，比如CursorAdapter依据Cursor读出一个数据库的数据，而一个ArrayAdapter则从任一个数组进行读取。

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