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Added in API level 1

public static interface AdapterView.OnItemSelectedListener

android.widget.AdapterView.OnItemSelectedListener

在此视图中的项目被选中时调用回调的接口定义。

Public methods
`abstract void`	`onItemSelected(AdapterView<?> parent, View view, int position, long id)` 当该视图中的项目被选中时，调用回调方法。
`abstract void`	`onNothingSelected(AdapterView<?> parent)` 当选择从此视图中消失时，将调用回调方法。

abstract void

onItemSelected(AdapterView<?> parent, View view, int position, long id)

当该视图中的项目被选中时，调用回调方法。

abstract void

onNothingSelected(AdapterView<?> parent)

当选择从此视图中消失时，将调用回调方法。

Added in API level 1

void onItemSelected (AdapterView<?> parent, 
                View view, 
                int position, 
                long id)

当该视图中的项目被选中时，调用回调方法。仅当新选择的职位与之前选定的职位不同或者没有选定的职位时，才会调用此回调。

Impelmenters can call getItemAtPosition(position) if they need to access the data associated with the selected item.

Parameters
`parent`	`AdapterView`: The AdapterView where the selection happened
`view`	`View`: The view within the AdapterView that was clicked
`position`	`int`: The position of the view in the adapter
`id`	`long`: The row id of the item that is selected

Added in API level 1

void onNothingSelected (AdapterView<?> parent)

当选择从此视图中消失时，将调用回调方法。例如，当触摸被激活或者适配器变空时，选择可以消失。

Parameters
`parent`	`AdapterView`: The AdapterView that now contains no selected item.