Android利用Jsoup解析实现简单新闻客户端
16lz
2021-01-26
预备知识：关于Jsoup，这个问题百度就能为你 解决：
Jsoup
先看效果图：
这是 2015/09/24 18:50左右获取来自腾讯新闻的一些新闻
这是 2015/09/24 18:50左右获取来自凤凰新闻的一些新闻
请看代码：
这是 获取数据的代码：
package com.example.cywtest1;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import org.jsoup.Jsoup;import org.jsoup.nodes.Document;import org.jsoup.nodes.Element;import org.jsoup.select.Elements;import android.annotation.SuppressLint;import android.app.Fragment;import android.content.Intent;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.AsyncTask;import android.os.Bundle;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.Button;import android.widget.ImageView;import android.widget.ListView;import android.widget.SimpleAdapter;import android.widget.AdapterView.OnItemClickListener;import android.widget.SimpleAdapter.ViewBinder;@SuppressLint("NewApi")public class MyTab1 extends Fragment { private View view; private ViewPager viewPager; private List<View> lists = new ArrayList<View>(); private ViewPagerAdapter adapter; private List<String> webUrl; private static boolean isInit = false; private ListView lv1; private ListView lv2; private ListView lv3; private Button btn1; private Button btn2; private Button btn3; private List<Map<String,Object>> listdata1; private List<Map<String,Object>> listdata2; private List<Map<String,Object>> listdata3; private SimpleAdapter simpleadapter1; private SimpleAdapter simpleadapter2; private SimpleAdapter simpleadapter3; private static boolean listdata1isInit = false; private static boolean listdata2isInit = false; private static boolean listdata3isInit = false; public void onCreate(){ fillWebUrl();// lists.add(getActivity().getLayoutInflater().inflate(R.layout.activity_list1, null));// lists.add(getActivity().getLayoutInflater().inflate(R.layout.activity_list2, null)); // lists.add(getActivity().getLayoutInflater().inflate(R.layout.activity_list3, null)); } public void fillWebUrl(){ webUrl = new ArrayList<String>(); webUrl.add("http://www.news.qq.com"); webUrl.add("http://www.news.qq.com/world_index.shtml"); webUrl.add("http://news.ifeng.com/society"); } public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { view = inflater.inflate(R.layout.mytab1, container, false); if(!isInit) { lists.add(inflater.inflate(R.layout.activity_list1, null)); lists.add(inflater.inflate(R.layout.activity_list2, null)); // lists.add(inflater.inflate(R.layout.activity_list3, null)); isInit = true; } initView(inflater,view); return view; } void initView(LayoutInflater inflater,View view){ viewPager = (ViewPager) view.findViewById(R.id.viewpager_firstpage_todaytopline); adapter=new ViewPagerAdapter(lists); viewPager.setAdapter(adapter); listdata1 = new ArrayList<Map<String, Object>>(); lv1 =(ListView) adapter.getPageList().get(0).findViewById(R.id.listview_news_list1); btn1 = (Button)adapter.getPageList().get(0).findViewById(R.id.button1_list1); simpleadapter1 = new SimpleAdapter(getActivity(), listdata1, R.layout.rlist, new String[] { "title", "info", "img" }, new int[] { R.id.title, R.id.info, R.id.img }); lv1.setAdapter(simpleadapter1); btn1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { // TODO Auto-generated method stub if(!listdata1isInit) { **new GetDataTask1().execute();**/*异步任务类获取数据*/ listdata1isInit = true; } } }); lv1.setOnItemClickListener(new OnItemClickListener(){ @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // TODO Auto-generated method stub HashMap<String, String> map = (HashMap<String, String>)lv1.getItemAtPosition(position); String url = map.get("url"); String title = map.get("title"); goWeb(url,title); } }); simpleadapter1.setViewBinder(new ViewBinder() { @Override public boolean setViewValue(View view, Object data, String textRepresentation) { if (view instanceof ImageView && data instanceof Bitmap) { ImageView iv = (ImageView) view; iv.setImageBitmap((Bitmap) data); return true; } return false; } }); listdata2 = new ArrayList<Map<String, Object>>(); lv2 =(ListView) adapter.getPageList().get(1).findViewById(R.id.listview_news_list2); btn2 = (Button)adapter.getPageList().get(1).findViewById(R.id.button1_list2); simpleadapter2 = new SimpleAdapter(getActivity(), listdata2, R.layout.rlist, new String[] { "title", "info", "img" }, new int[] { R.id.title, R.id.info, R.id.img }); lv2.setAdapter(simpleadapter2); btn2.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { // TODO Auto-generated method stub if(!listdata2isInit) { **new GetDataTask2().execute();** listdata2isInit = true; } } }); lv2.setOnItemClickListener(new OnItemClickListener(){ @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // TODO Auto-generated method stub HashMap<String, String> map = (HashMap<String, String>)lv2.getItemAtPosition(position); String url = map.get("url"); String title = map.get("title"); goWeb(url,title); } }); simpleadapter2.setViewBinder(new ViewBinder() { @Override public boolean setViewValue(View view, Object data, String textRepresentation) { if (view instanceof ImageView && data instanceof Bitmap) { ImageView iv = (ImageView) view; iv.setImageBitmap((Bitmap) data); return true; } return false; } }); // ViewPager滑动监听器 viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageSelected(int arg0) { // TODO Auto-generated method stub // 当滑动时，顶部的imageView是通过animation缓慢的滑动 switch (arg0) { case 0: listdata2isInit = false; listdata3isInit = false; break; case 1: listdata1isInit = false; listdata3isInit = false; break; case 2: listdata1isInit = false; listdata2isInit = false; break; default: break; } } @Override public void onPageScrolled(int arg0, float arg1, int arg2) { // TODO Auto-generated method stub // Toast.makeText(getApplicationContext(), "您正在滑动页面",Toast.LENGTH_SHORT).show(); } @Override public void onPageScrollStateChanged(int arg0) { // TODO Auto-generated method stub if(arg0==2){// Toast.makeText(getApplicationContext(), "页面滑动完毕", Toast.LENGTH_SHORT).show(); } } }); } void fillList1(){ if(!listdata1isInit) { new GetDataTask1().execute(); listdata1isInit = true; } } void fillList2(){ if(!listdata2isInit) { new GetDataTask2().execute(); listdata2isInit = true; } } void fillList3(){ if(!listdata3isInit) { new GetDataTask3().execute(); listdata3isInit = true; } } private void goWeb(String url,String title){ Intent it1 = new Intent(getActivity().getApplicationContext(),WebView1Activity.class); it1.putExtra("url", url); it1.putExtra("title", title); startActivity(it1); } public class ViewPagerAdapter extends PagerAdapter{ List<View> viewLists; ListView lv1; public ViewPagerAdapter(List<View> lists) { viewLists = lists; } @Override public int getCount() { //获得size // TODO Auto-generated method stub return viewLists.size(); } @Override public boolean isViewFromObject(View arg0, Object arg1) { // TODO Auto-generated method stub return arg0 == arg1; } @Override public void destroyItem(View view, int position, Object object) //销毁Item { ((ViewPager) view).removeView(viewLists.get(position)); } @Override public Object instantiateItem(View view, int position) //实例化Item { ((ViewPager) view).addView(viewLists.get(position), 0); return viewLists.get(position); } public List<View> getPageList(){ return viewLists; } } public Bitmap getBitmap(String urlStr) { Bitmap mBitmap = null; try { URL url = new URL(urlStr); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); InputStream is = conn.getInputStream(); mBitmap = BitmapFactory.decodeStream(is); } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return mBitmap; } public List<Map<String, Object>> requestHtml(int order) throws IOException { List<Map<String, Object>> list = new ArrayList<Map<String, Object>>(); Document doc = new Document(""); Elements listDiv = new Elements();// Document document = Jsoup.parse(new File("file:///android_asset/html/qqnews.html"),// "gbk"); switch(order){ case 0: /* 建立连接并获取HTML文档*/ **doc=Jsoup.connect("http://www.news.qq.com") .data("jquery", "java") .userAgent("Mozilla") .cookie("auth", "token") .timeout(50000) .get();** /*对文档进行解析，这个要自己去看新闻网站的新闻分类，以及元素组织结构*/ **listDiv = doc.select(".Q-tpList"); /* 利用“类选择器”选择元素*/ for (Element element : listDiv) { Elements aTag = element.getElementsByTag("a"); Elements pTag = element.getElementsByTag("p"); Element aTag1 = aTag.get(0); Element aTag2 = aTag.get(1); Element pTag1 = pTag.get(0); String url = aTag1.attr("href"); Elements imgTag = aTag1.getElementsByTag("img"); String imgUrl = imgTag.attr("src"); String title = aTag2.text().toString(); String info = pTag1.text().toString(); Map<String, Object> map = new HashMap<String, Object>(); map.put("title", title); map.put("img", getBitmap(imgUrl)); map.put("url", url); map.put("info", info); list.add(map); }** break; case 1: doc=Jsoup.connect("http://news.ifeng.com/society") .data("jquery", "java") .userAgent("Mozilla") .cookie("auth", "token") .timeout(50000) .get(); listDiv = doc.select(".juti_list"); for (Element element : listDiv) { Elements aTag = element.getElementsByTag("a"); Elements pTag = element.getElementsByTag("p"); Element aTag1 = aTag.get(0); Element aTag2 = aTag.get(1); Element pTag1 = pTag.get(0); String url = aTag1.attr("href"); Elements imgTag = aTag2.getElementsByTag("img"); String imgUrl = imgTag.attr("src"); String title = aTag1.text().toString(); String info = pTag1.text().toString(); Map<String, Object> map = new HashMap<String, Object>(); map.put("title", title); map.put("img", getBitmap(imgUrl)); map.put("url", url); map.put("info", info); list.add(map); } break; case 2: Log.i("163.com","start"); doc=Jsoup.connect("http://www.news.163.com") .data("jquery", "java") .userAgent("Mozilla") .cookie("auth", "token") .timeout(50000) .get(); Log.i("doc", doc.toString()); listDiv = doc.select("div.clearfix"); Log.i("163.com","end"); String listDiv_size = ""+listDiv.size(); Log.i("listDiv_size",listDiv_size); for (Element element : listDiv) { Elements aTag = element.getElementsByTag("a"); Elements pTag = element.getElementsByTag("p"); Element aTag1 = aTag.get(0); Element aTag2 = aTag.get(1); Element aTag3 = aTag.get(2); Element pTag1 = pTag.get(0); String url = aTag1.attr("href"); Elements imgTag = aTag1.getElementsByTag("img"); String imgUrl = imgTag.attr("src"); String title = aTag2.text().toString(); String info = aTag3.text().toString(); Map<String, Object> map = new HashMap<String, Object>(); map.put("title", title); map.put("img", getBitmap(imgUrl)); map.put("url", url); map.put("info", info); list.add(map); } Log.i("Jsoup-end","Jsoup-end"); String i = ""+list.size(); Log.i("list-size",i); break; default: break; } return list; } private class GetDataTask1 extends AsyncTask<String, Void, List<Map<String, Object>>> { @Override protected List<Map<String, Object>> doInBackground(String... params) { /** * 请求网络，获取新闻列表数据 */ List<Map<String, Object>> requestHtml = null; try { requestHtml = requestHtml(0); } catch (IOException e) { e.printStackTrace(); } return requestHtml; } @Override protected void onPostExecute(List<Map<String, Object>> data) { listdata1.addAll(data); simpleadapter1.notifyDataSetInvalidated(); } } private class GetDataTask2 extends AsyncTask<String, Void, List<Map<String, Object>>> { @Override protected List<Map<String, Object>> doInBackground(String... params) { /** * 请求网络，获取新闻列表数据 */ List<Map<String, Object>> requestHtml = null; try { requestHtml = requestHtml(1); } catch (IOException e) { e.printStackTrace(); } return requestHtml; } @Override protected void onPostExecute(List<Map<String, Object>> data) { listdata2.addAll(data); simpleadapter2.notifyDataSetInvalidated(); } } private class GetDataTask3 extends AsyncTask<String, Void, List<Map<String, Object>>> { @Override protected List<Map<String, Object>> doInBackground(String... params) { /** * 请求网络，获取新闻列表数据 */ List<Map<String, Object>> requestHtml = null; try { requestHtml = requestHtml(2); } catch (IOException e) { e.printStackTrace(); } return requestHtml; } @Override protected void onPostExecute(List<Map<String, Object>> data) { listdata3.addAll(data); simpleadapter3.notifyDataSetInvalidated(); } }}前台布局代码：
这是对于Fragment的布局，只用了一个ViewPager：
mytab1.xml
<?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.support.v4.view.ViewPager android:id="@+id/viewpager_firstpage_todaytopline" android:layout_width="wrap_content" android:layout_height="wrap_content" /></LinearLayout>这是ViewPager每一个Pager里面的一个列表的一个项的布局（一个列表项对应一条新闻）：
rlist.xml
<?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="horizontal" > <ImageView android:id="@+id/img" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="8dp" /> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical" > <TextView android:id="@+id/title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="8dp" android:textSize="14dp" /> <TextView android:id="@+id/info" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="20dp" android:textSize="11dp" /> </LinearLayout></LinearLayout>注意事项：
1、访问网页的代码记得写在异步任务类 AsyncTask 里面，或者自己 new
一个Thread，这是Android安全机制所考虑的，也是Android开发的常识。2、网上说对于Jsoup包的使用，需要在工程根目录下new 一个名为 “libs”的 folder 将Jsoup包添加进去，然后 build
path ，反正我就是这样做的，读者有时间可以试一试是否必须是 这样添加包。下面给出我的工程结构图：3、这是本人自己当时遇到的一个问题。我当时不知道什么时候导入了两个 Jsoup包，后来程序就一直出错（是运行时出错，好像提示是
无法找到类和资源什么），我还傻乎乎花时间苦想了两天~~~~。当然这不仅仅是这个新闻客户端的问题了，以后大家如果出现找不到资源类似的错误，可以看看自己是不是导错包了
（也许原因就是这么简单）
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