宝应网站设计,电子版简历免费的,公司形象墙设计图,电商网站策划书本文主要讲解实现了一个CSDN的安卓客户端#xff0c;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 FragmentviewpagerTabPageIndicator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…本文主要讲解实现了一个CSDN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 FragmentviewpagerTabPageIndicator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.csdn.DataUtil;
import com.zhy.csdn.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 ListNewsItem getNewsItems( int newsType , int currentPage) throws CommonException { String urlStr URLUtil.generateUrl(newsType, currentPage); String htmlStr DataUtil.doGet(urlStr); ListNewsItem newsItems new ArrayListNewsItem(); 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csdn上的各类别的文章 制作csdn app 二 - Hongyang - 博客频道 - CSDN.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
FragmentviewpagerTabPageIndicator实现Tab效果
package com.zhy.csdndemo; 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FragmentViewPagerIndicator 制作csdn app主要框架 - Hongyang - 博客频道 - CSDN.NET
viewPager的适配器
package com.zhy.csdndemo;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);}Overridepublic Fragment getItem(int arg0){MainFragment fragment new MainFragment(arg01);return fragment;}Overridepublic CharSequence getPageTitle(int position){return TITLES[position % TITLES.length];}Overridepublic 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.csdndemo;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.csdn.Constaint;
import com.zhy.csdndemo.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 ListNewsItem mDatas new ArrayListNewsItem();/*** 获得newType* param newsType*/public MainFragment(int newsType){this.newsType newsType;mNewsItemBiz new NewsItemBiz();}Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){return inflater.inflate(R.layout.tab_item_fragment_main, null);}Overridepublic 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();}Overridepublic void onRefresh(){new LoadDatasTask().execute();}Overridepublic void onLoadMore(){// TODO Auto-generated method stub}/*** 记载数据的异步任务* author zhy**/class LoadDatasTask extends AsyncTaskVoid, Void, Void{Overrideprotected Void doInBackground(Void... params){try{ListNewsItem newsItems mNewsItemBiz.getNewsItems(newsType, currentPage);mDatas newsItems;} catch (CommonException e){// TODO Auto-generated catch blocke.printStackTrace();}return null;}Overrideprotected void onPostExecute(Void result){mAdapter.addAll(mDatas);mAdapter.notifyDataSetChanged();mXListView.stopRefresh();}}}
xListView的adapter,其中使用了imageLoder
package com.zhy.csdndemo.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.csdn.DataUtil;
import com.zhy.csdndemo.R;public class NewsItemAdapter extends BaseAdapter
{private LayoutInflater mInflater;private ListNewsItem 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, ListNewsItem 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(ListNewsItem mDatas){this.mDatas.addAll(mDatas);}Overridepublic int getCount(){return mDatas.size();}Overridepublic Object getItem(int position){return mDatas.get(position);}Overridepublic long getItemId(int position){return position;}Overridepublic 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csdn上的各类别下的的文章列表 制作csdn app 三 - Hongyang - 博客频道 - CSDN.NET
效果如下
