Android开发之ViewSwitcher用法实例
内容摘要
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
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
文章正文
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:
1 2 3 4 5 6 7 8 9 10 11 12 | /** * {@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 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | <?xml version= "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:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | 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
1 | switcher = (ViewSwitcher) findViewById(R.id.viewSwitcher); |
第二部:实现接口ViewFactory
1 2 3 4 5 6 7 8 | switcher.setFactory( new ViewFactory() { @Override public View makeView() { return inflater.inflate(R.layout.slidelistview, null); } }); |
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