android用dom解析外部数据实例

package com.cn.client; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.URL; import java.net.URLConnection; import java.util.ArrayList; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.NodeList; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.EditText; import android.widget.ListView; import android.widget.TextView; public class ActivityMain extends Activity { private Button start; //private ExampleList examplelist; private TextView chinese; private ListView example; private EditText condition; private OnClickListener listen; private ArrayAdapter<ExampleList> adapter; private ArrayList<ExampleList> infoList=new ArrayList<ExampleList>(); /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); condition=(EditText)findViewById(R.id.condition); start=(Button)findViewById(R.id.start); chinese=(TextView)findViewById(R.id.chinese); example=(ListView)findViewById(R.id.list); adapter = new ArrayAdapter<ExampleList>(this,android.R.layout.simple_list_item_1,infoList); example.setAdapter(adapter); listen=new OnClickListener() { public void onClick(View v) { String con=condition.getText().toString(); try { String str="http://dict.cn/ws.php?q="+con; URL url=new URL(str); URLConnection connection = url.openConnection(); HttpURLConnection httpConnection = (HttpURLConnection)connection; int responseCode = httpConnection.getResponseCode(); if (responseCode == HttpURLConnection.HTTP_OK) { InputStream in = httpConnection.getInputStream(); DocumentBuilderFactory dbfactory = DocumentBuilderFactory.newInstance(); DocumentBuilder db = dbfactory.newDocumentBuilder(); Document dom = db.parse(in); Element docEle = dom.getDocumentElement(); NodeList nod=docEle.getElementsByTagName("dict"); Element dict=(Element)nod.item(0); Element def=(Element)dict.getElementsByTagName("def").item(0); String defstr=def.getFirstChild().getNodeValue(); chinese.setText(defstr); infoList.clear(); NodeList nl = docEle.getElementsByTagName("sent"); if (nl != null && nl.getLength() > 0) { for (int i = 0 ; i < nl.getLength(); i++) { Element sent = (Element)nl.item(i); Element orig = (Element)sent.getElementsByTagName("orig").item(0); Element trans = (Element)sent.getElementsByTagName("trans").item(0); String origstr = orig.getFirstChild().getNodeValue(); String transstr= trans.getFirstChild().getNodeValue(); ExampleList info = new ExampleList(origstr,transstr); newEntry(info); } } } } catch (Exception e) { e.printStackTrace(); } } }; start.setOnClickListener(listen); } private void newEntry(ExampleList info) { infoList.add(info); adapter.notifyDataSetChanged(); } public class ExampleList{ public String orig; public String trans; public ExampleList(String or,String tr) { this.orig=or; this.trans=tr; } public String toString() { return "例句\n"+orig+"\n翻译\n"+trans; } } }