Interface Adapter

public interface  Adapter:

(所在包)android.widget.Adapter

Known Indirect Subclasses(已知的间接子类)

ArrayAdapter<T>, BaseAdapter, CursorAdapter, HeaderViewListAdapter, ListAdapter, ResourceCursorAdapter, SimpleAdapter, 

SimpleCursorAdapter, SpinnerAdapter,WrapperListAdapter。

Class Overview(类概述)

An Adapter object acts as(充当,起什么作用,作为) a bridge between an AdapterView and the underlying(潜在的,在...下面的;所代表或相关的) data for that view. The Adapter provides access to the data items. The Adapter is also responsible for making a View for each item in the data set.

(一个Adapter对象充当着一个AdapterView和这个view相关的数据之间的桥梁。Adapter也提供对数据条目的访问。Adapter也负责为数据设置中的每个条目生产view。)

See Also(参见)

• ArrayAdapter
• CursorAdapter
• SimpleCursorAdapter

方法:

(1)public abstract int getCount ()

How many items are in the data set represented by this Adapter.

Returns:Count of items.

(这个Adapter所代表的数据集有多少项。返回值:项目的计数)

(2)public abstract Object getItem(int position)

Get the data item associated with the specified position in the data set.

(得到数据集里指定位置的数据项。)

Parameters(参数)

positionPosition of the item whose data we want within the adapter's data set.(位置:我们需要的在Adapter数据集里的数据的位置。)

Returns:

• The data at the specified position.(返回:在指定位置的数据。)
• (3)public abstract long getItemId(int position)
• Get the row id associated with the specified position in the list.
  
• (得到与列表指定位置相关的行的id)

• Parameters

  positionThe position of the item within the adapter's data set whose row id we want.

  Returns

  • The id of the item at the specified position.