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personnages


ViewSwitcher

版本:Android 2.3 r1

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結(jié)構(gòu)

繼承關(guān)系

public class ViewSwitcher extends ViewAnimator

????????

java.lang.Object

android.view.View

???????? android.view.ViewGroup

?????????????????? android.widget.FrameLayout

??????????????????????????? android.widget.ViewAnimator

???????????????????????????????????? android.widget.ViewSwitcher

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已知直接子類

ImageSwitcher, TextSwitcher

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類概述

在兩個(gè)視圖間轉(zhuǎn)換時(shí)顯示動(dòng)畫,有一個(gè)可以創(chuàng)建這些視圖的工廠類。你可以用工廠來創(chuàng)建這些視圖,也可以自己創(chuàng)建。一個(gè)ViewSwitcher只允許包含兩個(gè)子視圖,且一次僅能顯示一個(gè)。

(譯者注:與ViewFlipper類相似,但該類不常用,常用其兩個(gè)子類ImageSwitcher:轉(zhuǎn)換圖片時(shí)增加動(dòng)畫效果; TextSwitcher 轉(zhuǎn)換文字時(shí)增加動(dòng)畫效果; 其實(shí)例見apidemosImageSwitcher實(shí)例和TextSwitcher實(shí)例

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內(nèi)部類

interface ???????? ViewSwitcher.ViewFactory?????

在一個(gè)ViewSwitcher里創(chuàng)建視圖

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構(gòu)造函數(shù)

public ViewSwitcher (Context context)

構(gòu)造一個(gè)新的空的視圖轉(zhuǎn)換器(ViewSwitcher)

參數(shù)

context ? 應(yīng)用環(huán)境(譯者注:應(yīng)用程序上下文)

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public ViewSwitcher (Context context, AttributeSet attrs)

構(gòu)造一個(gè)指定上下文、屬性集合的空的視圖轉(zhuǎn)換器(ViewSwitcher)。

參數(shù)

context ? 應(yīng)用環(huán)境(譯者注:應(yīng)用程序上下文)

attrs ?????? 屬性集合

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公共方法

public void addView(View child, int index, ViewGroup.LayoutParams params)

??? 添加一個(gè)指定布局參數(shù)的子視圖

??????? 參數(shù)

child ??????? 添加的子視圖

index ????? 添加的子視圖的索引

params??? 子視圖的布局參數(shù)

異常

IllegalStateException?????? 如果切換器中已經(jīng)包含了兩個(gè)視圖時(shí)。

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public View getNextView ()

返回下一個(gè)要顯示的視圖

返回 ?

?????? 視圖切換之后將要顯示出的下一個(gè)視圖

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public void reset ()

重置視圖轉(zhuǎn)換器(ViewSwitcher)來隱藏所有存在的視圖,并使轉(zhuǎn)換器達(dá)到一次動(dòng)畫都還沒有播放的狀態(tài)。

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public void setFactory (ViewSwitcher.ViewFactory factory)

設(shè)置用來生成將在視圖轉(zhuǎn)換器中切換的兩個(gè)視圖的工廠。也可以調(diào)用兩次 addView(android.view.View, int, android.view.ViewGroup.LayoutParams)來替代使用工廠的方法。

參數(shù)

factory?? 用來生成轉(zhuǎn)換器內(nèi)容的視圖工廠

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補(bǔ)充

???????? 文章精選

?????????????????? android UI ViewSwitcher的使用(續(xù)二)

???????? Android: Don’t Overlook ViewSwitcher

???????? Using a ViewSwitcher in your Android xml layouts


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