CSDN客户端实现

本文主要讲解实现了一个****的安卓客户端，主要知识点如下

java爬虫获取网页数据
将java程序打包成jar包
Fragment+viewpager+TabPageIndicator实现Tab效果
gestureImageView实现放大缩小图片
imageLodar实现异步加载图上
XListView实现下拉刷新

java爬虫获取网页资源

package com.zhy.biz;  

import java.util.ArrayList;

import java.util.List;  

import org.jsoup.Jsoup;

import org.jsoup.nodes.Document;

import org.jsoup.nodes.Element;

import org.jsoup.select.Elements;  

import com.zhy.bean.CommonException;

import com.zhy.bean.NewsItem;

import com.zhy.****.DataUtil;

import com.zhy.****.URLUtil;  

/**

 * 处理NewItem的业务类

 * @author zhy

 *

 */

public class NewsItemBiz

{

    /**

     * 业界、移动、云计算

     *

     * @param htmlStr

     * @return

     * @throws CommonException

     */

    public List<NewsItem> getNewsItems( int newsType , int currentPage) throws CommonException

    {

        String urlStr = URLUtil.generateUrl(newsType, currentPage);  

        String htmlStr = DataUtil.doGet(urlStr);  

        List<NewsItem> newsItems = new ArrayList<NewsItem>();

        NewsItem newsItem = null;  

        Document doc = Jsoup.parse(htmlStr);

        Elements units = doc.getElementsByClass("unit");

        for (int i = 0; i < units.size(); i++)

        {

            newsItem = new NewsItem();

            newsItem.setNewsType(newsType);  

            Element unit_ele = units.get(i);  

            Element h1_ele = unit_ele.getElementsByTag("h1").get(0);

            Element h1_a_ele = h1_ele.child(0);

            String title = h1_a_ele.text();

            String href = h1_a_ele.attr("href");  

            newsItem.setLink(href);

            newsItem.setTitle(title);  

            Element h4_ele = unit_ele.getElementsByTag("h4").get(0);

            Element ago_ele = h4_ele.getElementsByClass("ago").get(0);

            String date = ago_ele.text();  

            newsItem.setDate(date);  

            Element dl_ele = unit_ele.getElementsByTag("dl").get(0);// dl

            Element dt_ele = dl_ele.child(0);// dt

            try

            {// 可能没有图片

                Element img_ele = dt_ele.child(0);

                String imgLink = img_ele.child(0).attr("src");

                newsItem.setImgLink(imgLink);

            } catch (IndexOutOfBoundsException e)

            {  

            }

            Element content_ele = dl_ele.child(1);// dd

            String content = content_ele.text();

            newsItem.setContent(content);

            newsItems.add(newsItem);

        }  

        return newsItems;  

    }  

}

详细实现参见链接

抓取****上的各类别的文章（制作**** app 二） - Hongyang - 博客频道 - ****.NET

将java项目打包成jar包

参考链接：在Eclipse中将Java项目打包为jar - 闵开慧的个人页面 - 开源中国社区

Fragment+viewpager+TabPageIndicator实现Tab效果

package com.zhy.****demo;  

import com.viewpagerindicator.TabPageIndicator;  

import android.os.Bundle;

import android.support.v4.app.FragmentActivity;

import android.support.v4.app.FragmentPagerAdapter;

import android.support.v4.view.ViewPager;  

public class MainActivity extends FragmentActivity

{

    private TabPageIndicator mIndicator ;

    private ViewPager mViewPager ;

    private FragmentPagerAdapter mAdapter ;  

    @Override

    protected void onCreate(Bundle savedInstanceState)

    {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);  

        mIndicator = (TabPageIndicator) findViewById(R.id.id_indicator);

        mViewPager = (ViewPager) findViewById(R.id.id_pager);

        mAdapter = new TabAdapter(getSupportFragmentManager());

        mViewPager.setAdapter(mAdapter);

        mIndicator.setViewPager(mViewPager, 0);  

    }  

}

详细实现参见链接

Android 使用Fragment，ViewPagerIndicator 制作**** app主要框架 - Hongyang - 博客频道 - ****.NET

viewPager的适配器

package com.zhy.****demo;

import android.support.v4.app.Fragment;

import android.support.v4.app.FragmentManager;

import android.support.v4.app.FragmentPagerAdapter;

public class TabAdapter extends FragmentPagerAdapter

{

    public static final String[] TITLES = new String[] { "业界", "移动", "研发", "程序员杂志", "云计算" };

    public TabAdapter(FragmentManager fm)

    {

        super(fm);

    }

    @Override

    public Fragment getItem(int arg0)

    {

        MainFragment fragment = new MainFragment(arg0+1);

        return fragment;

    }

    @Override

    public CharSequence getPageTitle(int position)

    {

        return TITLES[position % TITLES.length];

    }

    @Override

    public int getCount()

    {

        return TITLES.length;

    }

}

viewPager中的Fragment实现，其中用xListView实现了获取数据与刷新等功能

package com.zhy.****demo;

import java.util.ArrayList;

import java.util.List;

import me.maxwin.view.IXListViewLoadMore;

import me.maxwin.view.IXListViewRefreshListener;

import me.maxwin.view.XListView;

import android.annotation.SuppressLint;

import android.os.AsyncTask;

import android.os.Bundle;

import android.support.v4.app.Fragment;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import com.zhy.bean.CommonException;

import com.zhy.bean.NewsItem;

import com.zhy.biz.NewsItemBiz;

import com.zhy.****.Constaint;

import com.zhy.****demo.adapter.NewsItemAdapter;

@SuppressLint("ValidFragment")

public class MainFragment extends Fragment implements IXListViewRefreshListener, IXListViewLoadMore

{

    /**

     * 默认的newType

     */

    private int newsType = Constaint.NEWS_TYPE_YEJIE;

    /**

     * 当前页面

     */

    private int currentPage = 1;

    /**

     * 处理新闻的业务类

     */

    private NewsItemBiz mNewsItemBiz;

    /**

     * 扩展的ListView

     */

    private XListView mXListView;

    /**

     * 数据适配器

     */

    private NewsItemAdapter mAdapter;

    /**

     * 数据

     */

    private List<NewsItem> mDatas = new ArrayList<NewsItem>();

    /**

     * 获得newType

     * @param newsType

     */

    public MainFragment(int newsType)

    {

        this.newsType = newsType;

        mNewsItemBiz = new NewsItemBiz();

    }

    @Override

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)

    {

        return inflater.inflate(R.layout.tab_item_fragment_main, null);

    }

    @Override

    public void onActivityCreated(Bundle savedInstanceState)

    {

        super.onActivityCreated(savedInstanceState);

        mAdapter = new NewsItemAdapter(getActivity(), mDatas);

        /**

         * 初始化

         */

        mXListView = (XListView) getView().findViewById(R.id.id_xlistView);

        mXListView.setAdapter(mAdapter);

        mXListView.setPullRefreshEnable(this);

        mXListView.setPullLoadEnable(this);

        //mXListView.NotRefreshAtBegin();

        /**

         * 进来时直接刷新

         */

        mXListView.startRefresh();

    }

    @Override

    public void onRefresh()

    {

        new LoadDatasTask().execute();

    }

    @Override

    public void onLoadMore()

    {

        // TODO Auto-generated method stub

    }

    /**

     * 记载数据的异步任务

     * @author zhy

     *

     */

    class LoadDatasTask extends AsyncTask<Void, Void, Void>

    {

        @Override

        protected Void doInBackground(Void... params)

        {

            try

            {

                List<NewsItem> newsItems = mNewsItemBiz.getNewsItems(newsType, currentPage);

                mDatas = newsItems;

            } catch (CommonException e)

            {

                // TODO Auto-generated catch block

                e.printStackTrace();

            }

            return null;

        }

        @Override

        protected void onPostExecute(Void result)

        {

            mAdapter.addAll(mDatas);

            mAdapter.notifyDataSetChanged();

            mXListView.stopRefresh();

        }

    }

}

xListView的adapter,其中使用了imageLoder

package com.zhy.****demo.adapter;

import java.util.List;

import android.content.Context;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.ImageView;

import android.widget.TextView;

import com.nostra13.universalimageloader.core.DisplayImageOptions;

import com.nostra13.universalimageloader.core.ImageLoader;

import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;

import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer;

import com.nostra13.universalimageloader.core.display.RoundedBitmapDisplayer;

import com.zhy.bean.NewsItem;

import com.zhy.****.DataUtil;

import com.zhy.****demo.R;

public class NewsItemAdapter extends BaseAdapter

{

    private LayoutInflater mInflater;

    private List<NewsItem> mDatas;

    /**

     * 使用了github开源的ImageLoad进行了数据加载

     */

    private ImageLoader imageLoader = ImageLoader.getInstance();

    private DisplayImageOptions options;

    public NewsItemAdapter(Context context, List<NewsItem> datas)

    {

        this.mDatas = datas;

        mInflater = LayoutInflater.from(context);

        imageLoader.init(ImageLoaderConfiguration.createDefault(context));

        options = new DisplayImageOptions.Builder().showStubImage(R.drawable.images)

                .showImageForEmptyUri(R.drawable.images).showImageOnFail(R.drawable.images).cacheInMemory()

                .cacheOnDisc().displayer(new RoundedBitmapDisplayer(20)).displayer(new FadeInBitmapDisplayer(300))

                .build();

    }

    public void addAll(List<NewsItem> mDatas)

    {

        this.mDatas.addAll(mDatas);

    }

    @Override

    public int getCount()

    {

        return mDatas.size();

    }

    @Override

    public Object getItem(int position)

    {

        return mDatas.get(position);

    }

    @Override

    public long getItemId(int position)

    {

        return position;

    }

    @Override

    public View getView(int position, View convertView, ViewGroup parent)

    {

        ViewHolder holder = null;

        if (convertView == null)

        {

            convertView = mInflater.inflate(R.layout.news_item_yidong, null);

            holder = new ViewHolder();

            holder.mContent = (TextView) convertView.findViewById(R.id.id_content);

            holder.mTitle = (TextView) convertView.findViewById(R.id.id_title);

            holder.mDate = (TextView) convertView.findViewById(R.id.id_date);

            holder.mImg = (ImageView) convertView.findViewById(R.id.id_newsImg);

            convertView.setTag(holder);

        } else

        {

            holder = (ViewHolder) convertView.getTag();

        }

        NewsItem newsItem = mDatas.get(position);

        holder.mTitle.setText(DataUtil.ToDBC(newsItem.getTitle()));

        holder.mContent.setText(newsItem.getContent());

        holder.mDate.setText(newsItem.getDate());

        if (newsItem.getImgLink() != null)

        {

            holder.mImg.setVisibility(View.VISIBLE);

            imageLoader.displayImage(newsItem.getImgLink(), holder.mImg, options);

        } else

        {

            holder.mImg.setVisibility(View.GONE);

        }

        return convertView;

    }

    private final class ViewHolder

    {

        TextView mTitle;

        TextView mContent;

        ImageView mImg;

        TextView mDate;

    }

}

参考链接：

客户端上显示****上的各类别下的的文章列表（制作**** app 三） - Hongyang - 博客频道 - ****.NET

效果如下

****客户端实现

秒客网

CSDN客户端实现

本文主要讲解实现了一个****的安卓客户端，主要知识点如下

java爬虫获取网页资源

详细实现参见链接

将java项目打包成jar包

Fragment+viewpager+TabPageIndicator实现Tab效果

详细实现参见链接

viewPager的适配器

viewPager中的Fragment实现，其中用xListView实现了获取数据与刷新等功能

xListView的adapter,其中使用了imageLoder

参考链接：

效果如下

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