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Added in API level 1

public interface SpinnerAdapter
implements Adapter

android.widget.SpinnerAdapter

Known Indirect Subclasses

扩展Adapter ，这是Spinner及其数据之间的桥梁。微调适配器允许定义两个不同的视图：一个显示微调器本身的数据，另一个显示按下微调器时下拉列表中的数据。

From interface android.widget.Adapter

Public methods
`abstract View`	`getDropDownView(int position, View convertView, ViewGroup parent)` 获取一个 `View` ，它在下拉式弹出 `View`中显示数据集中指定位置的数据。

From interface android.widget.Adapter

Added in API level 1

View getDropDownView (int position, 
                View convertView, 
                ViewGroup parent)

获取一个 View ，它在下拉式弹出 View中显示数据集中指定位置的数据。

Parameters
`position`	`int`: index of the item whose view we want.
`convertView`	`View`: the old view to reuse, if possible. Note: You should check that this view is non-null and of an appropriate type before using. If it is not possible to convert this view to display the correct data, this method can create a new view.
`parent`	`ViewGroup`: the parent that this view will eventually be attached to

Returns
`View`	a `View` corresponding to the data at the specified position.