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 */@Overridepublic 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
<?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" ><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="horizontal" ><Buttonandroid:id="@+id/prev"android:layout_width="0dp"android:layout_height="wrap_content"android:layout_weight="1"android:text="previous" /><Buttonandroid:id="@+id/next"android:layout_width="0dp"android:layout_height="wrap_content"android:layout_weight="1"android:text="next" /></LinearLayout><ViewSwitcherandroid:id="@+id/viewswitcher"android:layout_width="match_parent"android:layout_height="wrap_content" ><ImageViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@drawable/ic_launcher" /><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:gravity="center"android:orientation="vertical" ><Buttonandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="- Button 2 -" /><TextViewandroid: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;@Overrideprotected 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() {@Overridepublic void onClick(View arg0) {viewSwitcher.showPrevious();}});buttonNext.setOnClickListener(new View.OnClickListener() {@Overridepublic 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(){@Overridepublic View makeView(){return inflater.inflate(R.layout.slidelistview, null);}});更多关于Android相关内容感兴趣的读者可查看本站专题:《Android开发入门与进阶教程》、《Android控件用法总结》、《Android短信与电话操作技巧汇总》及《Android多媒体操作技巧汇总(音频,视频,录音等)》
希望本文所述对大家Android程序设计有所帮助。