Android ViewPager 实现多个页面切换滑动(一)

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：

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 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();
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 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,