package com.example.mp3player00; import java.io.IOException; import java.io.StringReader; import java.util.ArrayList; import java.util.HashMap; import java.util.Iterator; import java.util.List; import javax.xml.parsers.ParserConfigurationException; import javax.xml.parsers.SAXParserFactory; import org.xml.sax.InputSource; import org.xml.sax.SAXException; import org.xml.sax.XMLReader; import xml.Mp3ListContentHandler; import model.Mp3Info; import com.example.download.HttpDownloader; import android.os.Bundle; import android.app.Activity; import android.app.ListActivity; import android.view.Menu; import android.view.MenuItem; import android.widget.SimpleAdapter; public class Mp3ListActivity extends ListActivity { private static final int upadate=1; private static final int about=2; //以上定义常量，看到值的名字就知道按钮的名字 //且为后面修改提供方便 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_mp3_list); updateListView(); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.activity_mp3_list, menu); menu.add(0, 1, 1,R.string.mp3list_update); menu.add(0, 2, 2, R.string.mp3list_about); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // TODO Auto-generated method stub //System.out.println("--->"+item.getItemId()); if(item.getItemId()==upadate) { updateListView(); } else if(item.getItemId()==about) { //用户点击了关于按钮 } return super.onOptionsItemSelected(item); } private void updateListView(){ //用户点击了更新按钮 String xml=downloadXML("http://192.168.1.100:8080/mp3/resources.xml"); //System.out.println("----->"+xml); List<Mp3Info> mp3infos = null; try { mp3infos = parse(xml); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); }//List<Mp3Info>可以看出一个int，String这样一个类型 //构建Adapter，首先生成一个List对象。List对象里面存的是HashMap，HashMap里面存的是String List<HashMap<String,String>> list=new ArrayList<HashMap<String,String>>(); //将Mp3Info迭代出来 for (Iterator iterator = mp3infos.iterator(); iterator.hasNext();) { Mp3Info mp3Info = (Mp3Info) iterator.next(); //生成一个HashMap对象 HashMap<String,String> map=new HashMap<String,String>(); //构造一个map map.put("mp3_name", mp3Info.getMp3Name()); map.put("mp3_size", mp3Info.getMp3Size()); //构造好map后添加到List中，即将HashMap添加到List中 list.add(map); } //生成adapter SimpleAdapter simpleAdapter=
new SimpleAdapter(this,list,R.layout.mp3info_item,new String[]{"mp3_name","mp3_size"},new int[]{R.id.mp3_name,R.id.mp3_size}); setListAdapter(simpleAdapter); } //写一个单独的下载函数，更加清晰 private String downloadXML(String urlStr) { HttpDownloader httpdownloader=new HttpDownloader(); String result=httpdownloader.download(urlStr); return result; } //在这个函数中解析xml //首先生成xml解析器 private List<Mp3Info> parse(String xmlStr) throws IOException { List<Mp3Info> info=new ArrayList<Mp3Info>(); SAXParserFactory saxParserFactory=SAXParserFactory.newInstance(); try { XMLReader xmlReader=saxParserFactory.newSAXParser().getXMLReader(); Mp3ListContentHandler mp3ListContentHandler=new Mp3ListContentHandler(info); xmlReader.setContentHandler(mp3ListContentHandler); xmlReader.parse(new InputSource(new StringReader(xmlStr))); //解析完数据都天道info里面，然后用for循环迭代出来 for (Iterator iterator = info.iterator(); iterator.hasNext();) { Mp3Info mp3Info = (Mp3Info) iterator.next(); System.out.println(mp3Info); } } catch (SAXException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (ParserConfigurationException e) { // TODO Auto-generated catch block e.printStackTrace(); } return info; } }
将updateListView()继续重构
1 package com.example.mp3player00; 2 3 import java.io.IOException; 4 import java.io.StringReader; 5 import java.util.ArrayList; 6 import java.util.HashMap; 7 import java.util.Iterator; 8 import java.util.List; 9 10 import javax.xml.parsers.ParserConfigurationException; 11 import javax.xml.parsers.SAXParserFactory; 12 13 import org.xml.sax.InputSource; 14 import org.xml.sax.SAXException; 15 import org.xml.sax.XMLReader; 16 17 import xml.Mp3ListContentHandler; 18 19 import model.Mp3Info; 20 21 import com.example.download.HttpDownloader; 22 23 import android.os.Bundle; 24 import android.app.Activity; 25 import android.app.ListActivity; 26 import android.view.Menu; 27 import android.view.MenuItem; 28 import android.widget.SimpleAdapter; 29 30 public class Mp3ListActivity extends ListActivity { 31 private static final int upadate=1; 32 private static final int about=2; 33 //以上定义常量，看到值的名字就知道按钮的名字 34 //且为后面修改提供方便 35 @Override 36 protected void onCreate(Bundle savedInstanceState) { 37 super.onCreate(savedInstanceState); 38 setContentView(R.layout.activity_mp3_list); 39 updateListView(); 40 } 41 42 @Override 43 public boolean onCreateOptionsMenu(Menu menu) { 44 // Inflate the menu; this adds items to the action bar if it is present. 45 getMenuInflater().inflate(R.menu.activity_mp3_list, menu); 46 menu.add(0, 1, 1,R.string.mp3list_update); 47 menu.add(0, 2, 2, R.string.mp3list_about); 48 return true; 49 } 50 51 @Override 52 public boolean onOptionsItemSelected(MenuItem item) { 53 // TODO Auto-generated method stub 54 //System.out.println("--->"+item.getItemId()); 55 if(item.getItemId()==upadate) 56 { 57 updateListView(); 58 59 60 } 61 else if(item.getItemId()==about) 62 { 63 //用户点击了关于按钮 64 } 65 return super.onOptionsItemSelected(item); 66 } 67 private SimpleAdapter buildSimpleAdapter(List<Mp3Info> mp3infos){ 68 //构建Adapter，首先生成一个List对象。List对象里面存的是HashMap，HashMap里面存的是String 69 70 List<HashMap<String,String>> list=new ArrayList<HashMap<String,String>>(); 71 //将Mp3Info迭代出来 72 for (Iterator iterator = mp3infos.iterator(); iterator.hasNext();) { 73 Mp3Info mp3Info = (Mp3Info) iterator.next(); 74 //生成一个HashMap对象 75 HashMap<String,String> map=new HashMap<String,String>(); 76 //构造一个map 77 map.put("mp3_name", mp3Info.getMp3Name()); 78 map.put("mp3_size", mp3Info.getMp3Size()); 79 //构造好map后添加到List中，即将HashMap添加到List中 80 list.add(map); 81 } 82 //生成adapter 83 SimpleAdapter simpleAdapter=
new SimpleAdapter(this,list,R.layout.mp3info_item,new String[]{"mp3_name","mp3_size"},new int[]{R.id.mp3_name,R.id.mp3_size}); 84 85 86 return simpleAdapter; 87 88 } 89 private void updateListView(){ 90 //用户点击了更新按钮 91 92 String xml=downloadXML("http://192.168.1.100:8080/mp3/resources.xml"); 93 //System.out.println("----->"+xml); 94 95 List<Mp3Info> mp3infos = null; 96 try { 97 mp3infos = parse(xml); 98 } catch (IOException e) { 99 // TODO Auto-generated catch block 100 e.printStackTrace(); 101 }//List<Mp3Info>可以看出一个int，String这样一个类型 102 SimpleAdapter simpleAdapter=buildSimpleAdapter(mp3infos); 103 setListAdapter(simpleAdapter); 104 105 } 106 //写一个单独的下载函数，更加清晰 107 private String downloadXML(String urlStr) 108 { 109 110 HttpDownloader httpdownloader=new HttpDownloader(); 111 String result=httpdownloader.download(urlStr); 112 return result; 113 } 114 //在这个函数中解析xml 115 //首先生成xml解析器 116 private List<Mp3Info> parse(String xmlStr) throws IOException 117 { 118 List<Mp3Info> info=new ArrayList<Mp3Info>(); 119 SAXParserFactory saxParserFactory=SAXParserFactory.newInstance(); 120 try { 121 XMLReader xmlReader=saxParserFactory.newSAXParser().getXMLReader(); 122 Mp3ListContentHandler mp3ListContentHandler=new Mp3ListContentHandler(info); 123 xmlReader.setContentHandler(mp3ListContentHandler); 124 xmlReader.parse(new InputSource(new StringReader(xmlStr))); 125 //解析完数据都天道info里面，然后用for循环迭代出来 126 for (Iterator iterator = info.iterator(); iterator.hasNext();) { 127 Mp3Info mp3Info = (Mp3Info) iterator.next(); 128 System.out.println(mp3Info); 129 } 130 131 132 } catch (SAXException e) { 133 // TODO Auto-generated catch block 134 e.printStackTrace(); 135 } catch (ParserConfigurationException e) { 136 // TODO Auto-generated catch block 137 e.printStackTrace(); 138 } 139 return info; 140 141 } 142 143 }