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watak


AbsListView.OnScrollListener

版本:Android 2.3 r1

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結(jié)構(gòu)

繼承關(guān)系

public static class AbsListView.OnScrollListener

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android.widget.AbsListView.OnScrollListener

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概述

???????? 為了在列表或網(wǎng)格滾動(dòng)時(shí)執(zhí)行回調(diào)函數(shù)而定義的接口。

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常量

public static final int SCROLL_STATE_FLING

用戶之前通過(guò)觸控滾動(dòng)并執(zhí)行了快速滾動(dòng)。滾動(dòng)動(dòng)畫(huà)正滑向停止點(diǎn)。

常量值: 2 (0x00000002)

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public static final int SCROLL_STATE_IDLE

視圖沒(méi)有滾動(dòng)。注意,使用軌跡球滾動(dòng)時(shí),在滾動(dòng)停止之前,一直處于空閑狀態(tài)。

常量值: 0 (0x00000000)

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public static final int SCROLL_STATE_TOUCH_SCROLL

用戶通過(guò)觸控滾動(dòng),并且手指沒(méi)有離開(kāi)屏幕。

常量值: 1 (0x00000001)

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公共方法

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

當(dāng)列表或網(wǎng)格的滾動(dòng)已經(jīng)完成時(shí)調(diào)用的回調(diào)函數(shù)。會(huì)在滾動(dòng)完成后調(diào)用。

參數(shù)

view ??????? 報(bào)告滾動(dòng)狀態(tài)的對(duì)象視圖。

firstVisibleItem ????? 第一個(gè)可見(jiàn)單元格的索引(如果 visibleItemCount == 0 則忽略該參數(shù))。

visibleItemCount ?? 可見(jiàn)單元格數(shù)。

totalItemCount ????? 列表適配器中的條目數(shù)。

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public abstract void onScrollStateChanged (AbsListView view, int scrollState)

當(dāng)列表視圖或網(wǎng)格視圖正在滾動(dòng)是執(zhí)行的回調(diào)函數(shù)。如果視圖正在滾動(dòng), 該方法會(huì)在渲染下一幀之前調(diào)用該方法。就是說(shuō),會(huì)在調(diào)用任何 getView(int, View, ViewGroup)方法之前調(diào)用。

參數(shù)

view ??????? 報(bào)告滾動(dòng)狀態(tài)的對(duì)象視圖。

scrollState ????? 當(dāng)前滾動(dòng)狀態(tài)。值為 SCROLL_STATE_IDLE、 SCROLL_STATE_TOUCH_SCROLLSCROLL_STATE_IDLE

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