anroid 滑动浏览

引用：http://www.2cto.com/kf/201204/126483.html

本文介绍Android中实现左右滑动的指引效果。

关于左右滑动效果，我在以前的一篇博文中提到过，有兴趣的朋友可以查看：http://www.2cto.com/kf/201203/123252.html

本文的目的是要实现左右滑动的指引效果。那么什么是指引效果呢？现在的应用为了有更好的用户体验，一般会在应用开始显示一些指引帮助页面，使用户能更好的理解应用的功能，甚至是一些新闻阅读器会把一些头条新闻以指引效果的形式显示。说个最基本的，就是我们的手机主屏幕就是这种效果。

下面我们就开始实现我们的左右滑动指引效果。为了大家更好的理解，我们先看下实现效果，如下图所示：

图所示：
 
  
 
  
 
      
 
在这里，我们需要用到google提到的一个包——android-support-v4.jar，这个包是为了方便实现android view之间的切换，关于android-support-v4.jar的详细信息，大家可以访问google官方网站：http://developer.android.com/sdk/compatibility-library.html
 
首先我们先看下项目结构：
 
 
 
核心实现代码如下所示：
  

 

package com.test.guide;
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.Window;
import android.view.ViewGroup.LayoutParams;
import android.widget.ImageView;

/**
 * Android实现左右滑动指引效果
 * @Description: Android实现左右滑动指引效果

 * @File: MyGuideViewActivity.java

 * @Package com.test.guide

 * @Author Hanyonglu

 * @Date 2012-4-6 下午11:15:18

 * @Version V1.0
 */
public class MyGuideViewActivity extends Activity {
     private ViewPager viewPager; 
     private ArrayList<View> pageViews; 
     private ImageView imageView; 
     private ImageView[] imageViews;
     // 包裹滑动图片LinearLayout
     private ViewGroup main;
     // 包裹小圆点的LinearLayout
     private ViewGroup group;
       
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // 设置无标题窗口
        requestWindowFeature(Window.FEATURE_NO_TITLE);
       
        LayoutInflater inflater = getLayoutInflater(); 
        pageViews = new ArrayList<View>(); 
        pageViews.add(inflater.inflate(R.layout.item05, null));
        pageViews.add(inflater.inflate(R.layout.item06, null));
        pageViews.add(inflater.inflate(R.layout.item01, null)); 
        pageViews.add(inflater.inflate(R.layout.item02, null)); 
        pageViews.add(inflater.inflate(R.layout.item03, null)); 
        pageViews.add(inflater.inflate(R.layout.item04, null)); 
       
        imageViews = new ImageView[pageViews.size()]; 
        main = (ViewGroup)inflater.inflate(R.layout.main, null); 
       
        group = (ViewGroup)main.findViewById(R.id.viewGroup); 
        viewPager = (ViewPager)main.findViewById(R.id.guidePages); 
       
        for (int i = 0; i < pageViews.size(); i++) { 
            imageView = new ImageView(MyGuideViewActivity.this); 
            imageView.setLayoutParams(new LayoutParams(20,20)); 
            imageView.setPadding(20, 0, 20, 0); 
            imageViews[i] = imageView; 
           
            if (i == 0) { 
                //默认选中第一张图片
                imageViews[i].setBackgroundResource(R.drawable.page_indicator_focused); 
            } else { 
                imageViews[i].setBackgroundResource(R.drawable.page_indicator); 
            } 
           
            group.addView(imageViews[i]); 
        } 
       
        setContentView(main);
       
        viewPager.setAdapter(new GuidePageAdapter()); 
        viewPager.setOnPageChangeListener(new GuidePageChangeListener()); 
    }
   
    // 指引页面数据适配器
    class GuidePageAdapter extends PagerAdapter { 
       
        @Override 
        public int getCount() { 
            return pageViews.size(); 
        } 
 
        @Override 
        public boolean isViewFromObject(View arg0, Object arg1) { 
            return arg0 == arg1; 
        } 
 
        @Override 
        public int getItemPosition(Object object) { 
            // TODO Auto-generated method stub 
            return super.getItemPosition(object); 
        } 
 
        @Override 
        public void destroyItem(View arg0, int arg1, Object arg2) { 
            // TODO Auto-generated method stub 
            ((ViewPager) arg0).removeView(pageViews.get(arg1)); 
        } 
 
        @Override 
        public Object instantiateItem(View arg0, int arg1) { 
            // TODO Auto-generated method stub 
            ((ViewPager) arg0).addView(pageViews.get(arg1)); 
            return pageViews.get(arg1); 
        } 
 
        @Override 
        public void restoreState(Parcelable arg0, ClassLoader arg1) { 
            // TODO Auto-generated method stub 
 
        } 
 
        @Override 
        public Parcelable saveState() { 
            // TODO Auto-generated method stub 
            return null; 
        } 
 
        @Override 
        public void startUpdate(View arg0) { 
            // TODO Auto-generated method stub 
 
        } 
 
        @Override 
        public void finishUpdate(View arg0) { 
            // TODO Auto-generated method stub 
 
        } 
    }
   
    // 指引页面更改事件监听器
    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 arg0) { 
            for (int i = 0; i < imageViews.length; i++) { 
                imageViews[arg0].setBackgroundResource(R.drawable.page_indicator_focused);
               
                if (arg0 != i) { 
                    imageViews[i].setBackgroundResource(R.drawable.page_indicator); 
                } 
            }
        } 
    } 
}

 

 

  item.xml代码如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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/linearLayout01"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

    </LinearLayout>   
   
    <LinearLayout
        android:id="@+id/linearLayout02"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:background="@drawable/divider_horizontal_line">
       
    </LinearLayout>
   
    <LinearLayout
        android:id="@+id/linearLayout1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

        <ImageView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:background="@drawable/feature_guide_0" >
        </ImageView>
    </LinearLayout>

    <LinearLayout
        android:id="@+id/linearLayout2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:background="@drawable/bg" >
       
        <LinearLayout
            android:id="@+id/linearLayout2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:layout_marginTop="30px"
            android:layout_marginBottom="30px"
            android:layout_marginLeft="30px"
            android:layout_marginRight="30px"
            android:background="@drawable/divider_horizontal_line" >
        </LinearLayout>

        <LinearLayout
            android:id="@+id/linearLayout3"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical" >

            <TextView
                android:id="@+id/textView1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textColor="#000000"
                android:paddingLeft="30px"
                android:paddingRight="30px"
                android:text="@string/text1" />
       
        </LinearLayout>
   
    </LinearLayout>

</LinearLayout>