Android ViewPager 实现多个页面切换滑动

作者: Mr梵谷
发布时间:2015-07-28 10:19:43

    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:

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);
                }
            }
            
        }
    }   
 }

 

 

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似。

 点击下载demo源码

 

 

标签: Android Droid
来源:http://www.cnblogs.com/eyu8874521/archive/2012/08/07/2626455

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