Android ViewPager 实现多个页面切换滑动

长平狐 发布于 2013/04/25 10:53
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使用ViewPager这个类可以轻松实现多个页面的滑动功能,而且相对viewgroup来讲要简单容易一些,在此之前我们需要导入 android-support-v4.jar这个jar包,是google提供的扩展包,位置路径为 android-sdk-windows\extras\android\support\v4\ android-support-v4.jar,如果没有找到,需要打开Android SDK Manager在Extras中进行下载,最后记得引入工程中并build path。

    在本示例中,我参考了几个demo整理出来的viewpager的最基本用法,制作了一个类似新闻导航功能的界面,每个页面的下方有对应的项目符号,当页面进行切换的时候项目符号也随之变化,下面是实现后的图片:

                                          

 

java代码:

复制代码
package com.cogent.viewpager;

import java.util.ArrayList;

import android.app.Activity;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.view.Window;
import android.widget.ImageView;

public  class ViewPagerGuideActivity  extends Activity {
     private ViewPager viewPager;
     /** 装分页显示的view的数组 */
     private ArrayList<View> pageViews;
     private ImageView imageView;
     /** 将小圆点的图片用数组表示 */
     private ImageView[] imageViews;
     // 包裹滑动图片的LinearLayout
     private ViewGroup viewPics;
     // 包裹小圆点的LinearLayout
     private ViewGroup viewPoints;
     /**  Called when the activity is first created.  */
    @Override
     public  void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE); // 设置无标题栏
        
        
// 将要分页显示的View装入数组中
        LayoutInflater inflater = getLayoutInflater();
        pageViews =  new ArrayList<View>();
        pageViews.add(inflater.inflate(R.layout.page01,  null));
        pageViews.add(inflater.inflate(R.layout.page02,  null));
        pageViews.add(inflater.inflate(R.layout.page03,  null));
        
         // 创建imageviews数组,大小是要显示的图片的数量
        imageViews =  new ImageView[pageViews.size()];
         // 从指定的XML文件加载视图
        viewPics = (ViewGroup) inflater.inflate(R.layout.view_pics,  null);
        
         // 实例化小圆点的linearLayout和viewpager
        viewPoints = (ViewGroup) viewPics.findViewById(R.id.viewGroup);
        viewPager = (ViewPager) viewPics.findViewById(R.id.guidePages);
        
         // 添加小圆点的图片
         for( int i=0;i<pageViews.size();i++){
            imageView =  new ImageView(ViewPagerGuideActivity. this);
             // 设置小圆点imageview的参数
            imageView.setLayoutParams( new LayoutParams(20,20)); // 创建一个宽高均为20 的布局
            imageView.setPadding(20, 0, 20, 0);
             // 将小圆点layout添加到数组中
            imageViews[i] = imageView;
            
             // 默认选中的是第一张图片,此时第一个小圆点是选中状态,其他不是
             if(i==0){
                imageViews[i].setBackgroundResource(R.drawable.page_indicator_focused);
            } else{
                imageViews[i].setBackgroundResource(R.drawable.page_indicator);
            }
            
             // 将imageviews添加到小圆点视图组
            viewPoints.addView(imageViews[i]);
        }
        
         // 显示滑动图片的视图
        setContentView(viewPics);
        
         // 设置viewpager的适配器和监听事件
        viewPager.setAdapter( new GuidePageAdapter());
        viewPager.setOnPageChangeListener( new GuidePageChangeListener());
    }
    
    
     class GuidePageAdapter  extends PagerAdapter{

         // 销毁position位置的界面
        @Override
         public  void destroyItem(View v,  int position, Object arg2) {
             //  TODO Auto-generated method stub
            ((ViewPager)v).removeView(pageViews.get(position));
            
        }

        @Override
         public  void finishUpdate(View arg0) {
             //  TODO Auto-generated method stub
            
        }
        
         // 获取当前窗体界面数
        @Override
         public  int getCount() {
             //  TODO Auto-generated method stub
             return pageViews.size();
        }

         // 初始化position位置的界面
        @Override
         public Object instantiateItem(View v,  int position) {
             //  TODO Auto-generated method stub
            ((ViewPager) v).addView(pageViews.get(position));  
             return pageViews.get(position);  
        }

         //  判断是否由对象生成界面
        @Override
         public  boolean isViewFromObject(View v, Object arg1) {
             //  TODO Auto-generated method stub
             return v == arg1;
        }



        @Override
         public  void startUpdate(View arg0) {
             //  TODO Auto-generated method stub
            
        }

        @Override
         public  int getItemPosition(Object object) {
             //  TODO Auto-generated method stub
             return  super.getItemPosition(object);
        }

        @Override
         public  void restoreState(Parcelable arg0, ClassLoader arg1) {
             //  TODO Auto-generated method stub
            
        }

        @Override
         public Parcelable saveState() {
             //  TODO Auto-generated method stub
             return  null;
        }
    }
    
    
     class GuidePageChangeListener  implements OnPageChangeListener{

        @Override
         public  void onPageScrollStateChanged( int arg0) {
             //  TODO Auto-generated method stub
            
        }

        @Override
         public  void onPageScrolled( int arg0,  float arg1,  int arg2) {
             //  TODO Auto-generated method stub
            
        }

        @Override
         public  void onPageSelected( int position) {
             //  TODO Auto-generated method stub
             for( int i=0;i<imageViews.length;i++){
                imageViews[position].setBackgroundResource(R.drawable.page_indicator_focused);
                 // 不是当前选中的page,其小圆点设置为未选中的状态
                 if(position !=i){
                    imageViews[i].setBackgroundResource(R.drawable.page_indicator);
                }
            }
            
        }
    }   
 }
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主页面的布局:

?
<?xml version= "1.0"  encoding= "utf-8" ?>
<FrameLayout xmlns:android= "http://schemas.android.com/apk/res/android"
     android:layout_width= "fill_parent"
     android:layout_height= "fill_parent"
     android:orientation= "vertical"  >
     
     <LinearLayout
         android:id= "@+id/linearLayout1"
         android:layout_width= "fill_parent"
         android:layout_height= "wrap_content"
         android:orientation= "vertical" >
         
         <include layout= "@layout/page_header" />
         
         <android.support.v4.view.ViewPager
             android:id= "@+id/guidePages"
             android:layout_width= "fill_parent"
             android:layout_height= "wrap_content" />
     </LinearLayout>
     
     <LinearLayout
         android:id= "@+id/linearLayout2"
         android:layout_width= "fill_parent"
         android:layout_height= "wrap_content"
         android:orientation= "vertical" >
         
         <RelativeLayout
             android:layout_width= "fill_parent"
             android:layout_height= "wrap_content"
             android:orientation= "vertical" >
             
             <LinearLayout
                 android:id= "@+id/viewGroup"
                 android:layout_width= "fill_parent"
                 android:layout_height= "wrap_content"
                 android:layout_alignParentBottom= "true"
                 android:layout_marginBottom= "40dp"
                 android:gravity= "center_horizontal"
                 android:orientation= "horizontal" >
                 
             </LinearLayout>
         </RelativeLayout>
         
     </LinearLayout>
 
     
 
</FrameLayout>

 

标题栏的布局:

?
<?xml version= "1.0"  encoding= "utf-8" ?>
<LinearLayout xmlns:android= "http://schemas.android.com/apk/res/android"
     android:layout_width= "match_parent"
     android:layout_height= "wrap_content"
     android:orientation= "horizontal"
     android:background= "@drawable/title"
     android:gravity= "center_vertical"  >
     <Button
         android:id= "@+id/btn_left"
         android:layout_width= "80dp"
         android:layout_height= "30dp"
         android:text= "返回"
         android:textSize= "15sp"
         android:textColor= "@android:color/white"
         android:background= "@drawable/header_btn"
         android:layout_margin= "5dp" />
     <TextView
         android:id= "@+id/tvTitle"
         android:layout_width= "wrap_content"
         android:layout_height= "wrap_content"
         android:text= "奥运快报"
         android:textSize= "18sp"
         android:layout_weight= "1"
         android:ellipsize= "end"
         android:gravity= "center_horizontal" />
     <Button
         android:id= "@+id/btn_right"
         android:layout_width= "80dp"
         android:layout_height= "30dp"
         android:text= "首页"
         android:textSize= "15sp"
         android:textColor= "@android:color/white"
         android:background= "@drawable/header_btn"
         android:layout_margin= "5dp" />
 
</LinearLayout>

子页面的布局:

?
<?xml version= "1.0"  encoding= "utf-8" ?>
<LinearLayout xmlns:android= "http://schemas.android.com/apk/res/android"
     android:layout_width= "match_parent"
     android:layout_height= "match_parent"
     android:orientation= "vertical"
     android:background= "@android:color/white"  >
     <LinearLayout
         android:layout_width= "fill_parent"
         android:layout_height= "wrap_content" >
     <ImageView
         android:layout_width= "fill_parent"
         android:layout_height= "wrap_content"
         android:src= "@drawable/pic_lindan" />
     </LinearLayout>
     
     <LinearLayout
         android:layout_width= "fill_parent"
         android:layout_height= "wrap_content"
         android:layout_marginTop= "10dp"
         android:layout_marginBottom= "10dp"
         android:layout_marginLeft= "30dp"
         android:layout_marginRight= "30dp"
         android:background= "@drawable/divider_horizontal_line" >
     </LinearLayout>
     <LinearLayout
         android:layout_width= "fill_parent"
         android:layout_height= "fill_parent" >
         <TextView
             android:layout_width= "fill_parent"
             android:layout_height= "wrap_content"
             android:layout_marginRight= "30dp"
             android:layout_marginLeft= "30dp"
             android:textColor= "@android:color/black"
             android:text= "@string/string_lindan" />
     </LinearLayout>
     
 
</LinearLayout>

其余子页面的布局类。


原文链接:http://blog.csdn.net/eyu8874521/article/details/7838525
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