本文實例講述了Android開發之ViewSwitcher用法。分享給大家供大家參考,具體如下:
android.widget.ViewSwitcher是ViewAnimator的子類,用于在兩個View之間切換,但每次只能顯示一個View。
ViewSwitcher的addView函數的代碼如下:
/** * {@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的數量超過兩個,會拋出異常:java.lang.IllegalStateException,打印 "Can't add more than 2 views to a ViewSwitcher" 。你可以使用ViewSwitcher的factory創建View或添加自己創建的View。
下面用一個例子介紹一下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" > <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的代碼:
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(); } }); ; }}實現效果圖:

使用ViewSwitcher的setFactory設置切換的View,分為兩步。
第一步:獲得ViewSwithcer的實例
switcher = (ViewSwitcher) findViewById(R.id.viewSwitcher);
第二部:實現接口ViewFactory
switcher.setFactory(new ViewFactory(){ @Override public View makeView() { return inflater.inflate(R.layout.slidelistview, null); }});更多關于Android相關內容感興趣的讀者可查看本站專題:《Android開發入門與進階教程》、《Android控件用法總結》、《Android短信與電話操作技巧匯總》及《Android多媒體操作技巧匯總(音頻,視頻,錄音等)》
希望本文所述對大家Android程序設計有所幫助。
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