android多任务断点下载

由于Android项目开源所致，市面上出现了N多安卓软件市场。为了让我们开发的软件有更多的用户使用，我们需要向N多市场发布，软件升级后，我们也必须到安卓市场上进行更新，给我们增加了工作量。因此我们有必要给我们的Android应用增加自动更新的功能。既然实现自动更新，我们首先必须让我们的应用知道是否存在新版本的软件，因此我们可以在自己的网站上放置配置文件，存放软件的版本信息： 2 baidu_xinwen_1.1.0 http://gdown.baidu.com/data/wisegame/f98d235e39e29031/baiduxinwen.apk在这里我使用的是XML文件，方便读取。由于XML文件内容比较少，因此可通过DOM方式进行文件的解析public class ParseXmlService{ public HashMap parseXml(InputStream inStream) throws Exception { HashMap hashMap = new HashMap(); // 实例化一个文档构建器工厂 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); // 通过文档构建器工厂获取一个文档构建器 DocumentBuilder builder = factory.newDocumentBuilder(); // 通过文档通过文档构建器构建一个文档实例 Document document = builder.parse(inStream); //获取XML文件根节点 Element root = document.getDocumentElement(); //获得所有子节点 NodeList childNodes = root.getChildNodes(); for (int j = 0; j < childNodes.getLength(); j ) { //遍历子节点 Node childNode = (Node) childNodes.item(j); if (childNode.getNodeType() == Node.ELEMENT_NODE) { Element childElement = (Element) childNode; //版本号 if ("version".equals(childElement.getNodeName())) { hashMap.put("version",childElement.getFirstChild().getNodeValue()); } //软件名称 else if (("name".equals(childElement.getNodeName()))) { hashMap.put("name",childElement.getFirstChild().getNodeValue()); } //下载地址 else if (("url".equals(childElement.getNodeName()))) { hashMap.put("url",childElement.getFirstChild().getNodeValue()); } } } return hashMap; }}通过parseXml()方法，我们可以获取服务器上应用的版本、文件名以及下载地址。紧接着我们就需要获取到我们手机上应用的版本信息：/** * 获取软件版本号 * * @param context * @return */private int getVersionCode(Context context){ int versionCode = 0; try { // 获取软件版本号， versionCode = context.getPackageManager().getPackageInfo("com.szy.update", 0).versionCode; } catch (NameNotFoundException e) { e.printStackTrace(); } return versionCode;}           通过该方法我们获取到的versionCode对应AndroidManifest.xml下android:versionCode。android:versionCode和android:versionName两个属性分别表示版本号，版本名称。versionCode是整数型，而versionName是字符串。由于versionName是给用户看的，不太容易比较大小，升级检查时，就可以检查versionCode。把获取到的手机上应用版本与服务器端的版本进行比较，应用就可以判断处是否需要更新软件。处理流程                                  

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android短信功能 核心代码：package cn.edu.siso;import java.util.ArrayList;import java.util.HashMap;import java.util.Iterator;import java.util.List;import javax.xml.parsers.SAXParserFactory;import org.xml.sax.InputSource;import org.xml.sax.XMLReader;import android.app.ListActivity;import android.content.Intent;import android.os.Bundle;import android.view.KeyEvent;import android.view.View;import android.view.Window;import android.widget.Button;import android.widget.ListView;import android.widget.SimpleAdapter;import cn.edu.ContentProvide.Diary.DiaryColumns;import cn.edu.Info.MyInfo;import cn.edu.MyContentHandler.MyContentHandler;import cn.edu.siso.WareHouselistview.SMSBsharpturn;import cn.edu.siso.WareHouselistview.SMSFriendTab;import cn.edu.siso.WareHouselistview.SMSHavefanTab;import cn.edu.siso.WareHouselistview.SMSLoverTab;import cn.edu.siso.WareHouselistview.SMSSchooljoke;import cn.edu.siso.WareHouselistview.SMSapologize;import cn.edu.siso.WareHouselistview.SMShumorjokes;import cn.edu.siso.WareHouselistview.SMSlovewords;import cn.edu.siso.WareHouselistview.SMSmylove;import cn.edu.siso.WareHouselistview.SMSplayful;public class WareHouseActivity extends ListActivity { /** Called when the activity is first created. */ private List mp3Infos=null; private ListView listview; private Button back,updata; public static final String[] PROJECTION = new String[] { DiaryColumns._ID,DiaryColumns.TITLE, DiaryColumns.CREATED }; private Touch touch=new Touch(); @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.warehouse); listview=(ListView) findViewById(android.R.id.list); listview.setScrollingCacheEnabled(false); ShowListView(); back=(Button) findViewById(R.id.back); updata=(Button) findViewById(R.id.updata); back.setOnClickListener(new backlistener()); updata.setOnClickListener(new updatalistener()); back.setOnTouchListener(touch); updata.setOnTouchListener(touch); } private SimpleAdapter budildSimpleAdapter(List mp3Infos){ List list=new ArrayList(); for (Iterator iterator = mp3Infos.iterator(); iterator.hasNext();) { MyInfo mp3Info = (MyInfo) iterator.next(); HashMap map=new HashMap(); map.put("name", mp3Info.getName()); map.put("listimageview", R.drawable.image); list.add(map); } SimpleAdapter listadapter=new SimpleAdapter(this, list, R.layout.textview, new String[]{"name","listimageview"}, new int[]{R.id.houseText,R.id.listimageview}); return listadapter ; } private void ShowListView(){ mp3Infos=pares(R.raw.information); SimpleAdapter listadapter= budildSimpleAdapter(mp3Infos); setListAdapter(listadapter); } public List pares(Object xmlname){ List info=new ArrayList(); try { SAXParserFactory factory=SAXParserFactory.newInstance(); XMLReader reader=factory.newSAXParser().getXMLReader(); MyContentHandler mycontenthandler=new MyContentHandler(info); reader.setContentHandler(mycontenthandler); reader.parse(new InputSource(getResources().openRawResource((Integer) xmlname))); } catch (Exception e) { e.printStackTrace(); } return info; } @Override protected void onListItemClick(ListView l, View v, int position, long id) { // TODO Auto-generated method stub //MyInfo myinfo=mp3Infos.get(position); //System.out.println("myinfo-------" myinfo); Intent intent =new Intent(); switch(position){ case 0: intent.setClass(WareHouseActivity.this, SMSapologize.class); startActivity(intent); break; case 1: intent.setClass(WareHouseActivity.this, SMSmylove.class); startActivity(intent); break; case 2: intent.setClass(WareHouseActivity.this, SMSlovewords.class); startActivity(intent); break; case 3: intent.setClass(WareHouseActivity.this, SMSHavefanTab.class); startActivity(intent); break; case 4: intent.setClass(WareHouseActivity.this, SMSLoverTab.class); startActivity(intent); break; case 5: intent.setClass(WareHouseActivity.this, SMSplayful.class); startActivity(intent); break; case 6: intent.setClass(WareHouseActivity.this, SMSBsharpturn.class); startActivity(intent); break; case 7: intent.setClass(WareHouseActivity.this, SMShumorjokes.class); startActivity(intent); break; case 8: intent.setClass(WareHouseActivity.this, SMSFriendTab.class); startActivity(intent); break; case 9: intent.setClass(WareHouseActivity.this, SMSSchooljoke.class); startActivity(intent); break; case 10: intent.setClass(WareHouseActivity.this, SMSSchooljoke.class); startActivity(intent); break; case 11: intent.setClass(WareHouseActivity.this, SMSSchooljoke.class); startActivity(intent); break; case 12: intent.setClass(WareHouseActivity.this, SMSSchooljoke.class); startActivity(intent); break; case 13: intent.setClass(WareHouseActivity.this, SMSSchooljoke.class); startActivity(intent); break; case 14: intent.setClass(WareHouseActivity.this, SMSSchooljoke.class); startActivity(intent); break; case 15: intent.setClass(WareHouseActivity.this, SMSSchooljoke.class); startActivity(intent); break; case 16: intent.setClass(WareHouseActivity.this, SMSSchooljoke.class); startActivity(intent); break; } super.onListItemClick(l, v, position, id); } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { // TODO Auto-generated method stub if(keyCode==KeyEvent.KEYCODE_BACK&&event.getRepeatCount()==0){ //需要处理 Intent intent =new Intent(); intent.setClass(WareHouseActivity.this, InformationActivityActivity.class); startActivity(intent); finish(); } return false; } class backlistener implements Button.OnClickListener{ @Override public void onClick(View arg0) { // TODO Auto-generated method stub Intent intent = new Intent(); intent.setClass(WareHouseActivity.this,InformationActivityActivity.class); startActivity(intent); finish(); }} class updatalistener implements Button.OnClickListener{ @Override public void onClick(View v) { ShowListView(); }}}

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