本文实例讲述了Android开发之ViewSwitcher用法。分享给大家供大家参考，具体如下：

android.widget.ViewSwitcher是ViewAnimator的子类，用于在两个View之间切换，但每次只能显示一个View。

ViewSwitcher的addView函数的代码如下：

/** * {@inheritDoc} * * @throws IllegalStateException if this switcher already contains two children */ @Override public void addView(View child, int index, ViewGroup.LayoutParams params) { if (getChildCount() >= 2) { throw new IllegalStateException("Can't add more than 2 views to a ViewSwitcher"); } super.addView(child, index, params); }

可以看出，若View的数量超过两个，会抛出异常：java.lang.IllegalStateException，打印 "Can't add more than 2 views to a ViewSwitcher" 。你可以使用ViewSwitcher的factory创建View或添加自己创建的View。

下面用一个例子介绍一下ViewSwitcher的用法。

布局文件：activity_main.xml

<"1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".MainActivity" > <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" > <Button android:id="@+id/prev" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="previous" /> <Button android:id="@+id/next" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="next" /> </LinearLayout> <ViewSwitcher android:id="@+id/viewswitcher" android:layout_width="match_parent" android:layout_height="wrap_content" > <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/ic_launcher" /> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:orientation="vertical" > <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="- Button 2 -" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="LinearLayout 2" /> </LinearLayout> </ViewSwitcher> </LinearLayout>

Activity的代码：

package com.example.AndroidTest; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.animation.Animation; import android.view.animation.AnimationUtils; import android.widget.Button; import android.widget.ViewSwitcher; public class MyActivity extends Activity { Button buttonPrev, buttonNext; ViewSwitcher viewSwitcher; Animation slide_in_left, slide_out_right; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); buttonPrev = (Button) findViewById(R.id.prev); buttonNext = (Button) findViewById(R.id.next); viewSwitcher = (ViewSwitcher) findViewById(R.id.viewswitcher); slide_in_left = AnimationUtils.loadAnimation(this, android.R.anim.slide_in_left); slide_out_right = AnimationUtils.loadAnimation(this, android.R.anim.slide_out_right); viewSwitcher.setInAnimation(slide_in_left); viewSwitcher.setOutAnimation(slide_out_right); buttonPrev.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { viewSwitcher.showPrevious(); } }); buttonNext.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { viewSwitcher.showNext(); } }); ; } }

实现效果图：

使用ViewSwitcher的setFactory设置切换的View，分为两步。

第一步：获得ViewSwithcer的实例

switcher = (ViewSwitcher) findViewById(R.id.viewSwitcher);

第二部：实现接口ViewFactory

switcher.setFactory(new ViewFactory() { @Override public View makeView() { return inflater.inflate(R.layout.slidelistview, null); } });

希望本文所述对大家Android程序设计有所帮助。