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watak


AbsListView.OnScrollListener

版本：Android 2.3 r1

 

结构

继承关系

public static class AbsListView.OnScrollListener

        

android.widget.AbsListView.OnScrollListener

 

概述

         为了在列表或网格滚动时执行回调函数而定义的接口。

 

常量

public static final int SCROLL_STATE_FLING

用户之前通过触控滚动并执行了快速滚动。滚动动画正滑向停止点。

常量值： 2 (0x00000002)

 

public static final int SCROLL_STATE_IDLE

视图没有滚动。注意，使用轨迹球滚动时，在滚动停止之前，一直处于空闲状态。

常量值： 0 (0x00000000)

 

public static final int SCROLL_STATE_TOUCH_SCROLL

用户通过触控滚动，并且手指没有离开屏幕。

常量值： 1 (0x00000001)

 

公共方法

         public abstract void onScroll (AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)

当列表或网格的滚动已经完成时调用的回调函数。会在滚动完成后调用。

参数

view         报告滚动状态的对象视图。

firstVisibleItem       第一个可见单元格的索引（如果 visibleItemCount == 0 则忽略该参数）。

visibleItemCount    可见单元格数。

totalItemCount       列表适配器中的条目数。

 

public abstract void onScrollStateChanged (AbsListView view, int scrollState)

当列表视图或网格视图正在滚动是执行的回调函数。如果视图正在滚动， 该方法会在渲染下一帧之前调用该方法。就是说，会在调用任何 getView(int, View, ViewGroup)方法之前调用。

参数

view         报告滚动状态的对象视图。

scrollState       当前滚动状态。值为 SCROLL_STATE_IDLE、 SCROLL_STATE_TOUCH_SCROLL或SCROLL_STATE_IDLE。

 

 
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