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androidAPP程序自动更新/下载的实现


Android APP应用都有版本的更新,那么怎样实现更新呢?今天就为大家介绍应用自动更新的全过程。
程序自动更新的流程大致如下:
程序启动 -->适时后台检查更新--->链接远程服务器-->获取新版本信息
-->比对当前版本-->if(有更新)-->显示更新提示对话框并显示更新的内容-->交与用户选择.
下面是我做的demo,大家可以参考一下:
布局比较简单就不上代码了。
主程序代码:



package com.cloay.update; 
 
import java.io.IOException; 
import java.net.HttpURLConnection; 
import java.net.MalformedURLException; 
import java.net.URL; 
 
import android.app.Activity; 
import android.app.AlertDialog; 
import android.content.DialogInterface; 
import android.content.pm.PackageManager.NameNotFoundException; 
import android.os.Bundle; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.Toast; 
/**
 * 程序自动更新
 * UpdateTestActivity.java
 * @author Cloay
 * 2011-11-23
 */ 
public class UpdateTestActivity extends Activity { 
    private Button button; 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.main); 
         
        button = (Button) findViewById(R.id.check); 
        button.setOnClickListener(new OnClickListener() { 
             
            @Override 
            public void onClick(View v) { 
                try { 
                    checkVersion(); 
                } catch (NameNotFoundException e) { 
                    // TODO Auto-generated catch block  
                    e.printStackTrace(); 
                } 
            } 
        }); 
    } 
     
    /**
     * 检查是否需要更新程序
     * @throws NameNotFoundException 
     */ 
    private void checkVersion() throws NameNotFoundException{ 
        UpdateInfo updateInfo = new UpdateInfo(); 
        URL url; 
        try { 
            url = new URL("http://localhost:8080/update.xml"); 
            HttpURLConnection connection = (HttpURLConnection) url.openConnection(); 
//          connection.setConnectTimeout(5000);  
            updateInfo = ParseXmlUtils.parseXml(connection.getInputStream()); 
             
        } catch (MalformedURLException e) { 
            e.printStackTrace(); 
        } catch (IOException e) { 
            e.printStackTrace(); 
        } 
        if(updateInfo.getVersion().equals(VersionUtil.getVersionName(this))){ 
            Toast.makeText(this, "版本相同,不需要升级!", Toast.LENGTH_SHORT).show(); 
        } 
        else{ 
            showUpdateDialog(updateInfo); 
        } 
    } 
 
    private void showUpdateDialog(UpdateInfo updateInfo) { 
        AlertDialog alertDialog = new AlertDialog.Builder(this) 
        .setTitle("提示检测到新版本,确定升级吗?") 
        .setIcon(R.drawable.ask) 
        .setMessage(updateInfo.getDescription()) 
        .setPositiveButton("确定",  
        new DialogInterface.OnClickListener() { 
            @Override 
            public void onClick(DialogInterface dialog, int which) { 
                dialog.cancel();   
            } 
        }) 
        .setNegativeButton("取消", 
        new DialogInterface.OnClickListener() { 
             
            @Override 
            public void onClick(DialogInterface dialog, int which) { 
                dialog.cancel();     
            } 
        }).create(); 
        alertDialog.show(); 
    } 
} 
package com.cloay.update;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
/**
 * 程序自动更新
 * UpdateTestActivity.java
 * @author Cloay
 * 2011-11-23
 */
public class UpdateTestActivity extends Activity {
 private Button button;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        button = (Button) findViewById(R.id.check);
        button.setOnClickListener(new OnClickListener() {
   
   @Override
   public void onClick(View v) {
    try {
     checkVersion();
    } catch (NameNotFoundException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
   }
  });
    }
   
    /**
     * 检查是否需要更新程序
     * @throws NameNotFoundException
     */
    private void checkVersion() throws NameNotFoundException{
     UpdateInfo updateInfo = new UpdateInfo();
     URL url;
  try {
   url = new URL("http://localhost:8080/update.xml");
   HttpURLConnection connection = (HttpURLConnection) url.openConnection();
//   connection.setConnectTimeout(5000);
   updateInfo = ParseXmlUtils.parseXml(connection.getInputStream());
   
  } catch (MalformedURLException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }
  if(updateInfo.getVersion().equals(VersionUtil.getVersionName(this))){
   Toast.makeText(this, "版本相同,不需要升级!", Toast.LENGTH_SHORT).show();
  }
  else{
   showUpdateDialog(updateInfo);
  }
    }

 private void showUpdateDialog(UpdateInfo updateInfo) {
  AlertDialog alertDialog = new AlertDialog.Builder(this)
  .setTitle("提示检测到新版本,确定升级吗?")
  .setIcon(R.drawable.ask)
  .setMessage(updateInfo.getDescription())
  .setPositiveButton("确定",
  new DialogInterface.OnClickListener() {
   @Override
   public void onClick(DialogInterface dialog, int which) {
    dialog.cancel(); 
   }
  })
  .setNegativeButton("取消",
  new DialogInterface.OnClickListener() {
   
   @Override
   public void onClick(DialogInterface dialog, int which) {
    dialog.cancel();   
   }
  }).create();
  alertDialog.show();
 }
}

 

这里说明一下:远程服务器放置一个xml文件,用来说明当前新版本的信息。包括版本号,新版本功能说明,新版下载链接

 


xml解析工具代码:


package com.cloay.update; 
 
import java.io.IOException; 
import java.io.InputStream; 
 
import javax.xml.parsers.DocumentBuilder; 
import javax.xml.parsers.DocumentBuilderFactory; 
import javax.xml.parsers.ParserConfigurationException; 
 
import org.w3c.dom.Document; 
import org.w3c.dom.Element; 
import org.w3c.dom.NodeList; 
import org.xml.sax.SAXException; 
/**
 * 解析Xml文件
 * ParseXmlUtils.java
 * @author Cloay
 * 2011-11-7
 */ 
public class ParseXmlUtils { 
    /**
     * 通过InputStream 解析文件
     * @param in
     * @return
     */ 
    public static UpdateInfo parseXml(InputStream in){ 
        UpdateInfo updateInfo = new UpdateInfo(); 
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();           
        DocumentBuilder db = null;       
        try { 
            db = dbf.newDocumentBuilder(); 
            Document doc = null;     
            doc = db.parse(in);  
            Element root = doc.getDocumentElement(); 
            NodeList resultNode = root.getElementsByTagName("info");     
            for(int i = 0; i < resultNode.getLength();i++){     
                Element res = (Element)resultNode.item(i);   
                updateInfo.setVersion(res.getElementsByTagName("version").item(0).getFirstChild().getNodeValue()); 
                updateInfo.setUrl(res.getElementsByTagName("url").item(0).getFirstChild().getNodeValue()); 
                updateInfo.setDescription(res.getElementsByTagName("description").item(0).getFirstChild().getNodeValue()); 
            } 
        } catch (ParserConfigurationException e) { 
            e.printStackTrace(); 
        } catch (SAXException e) { 
            e.printStackTrace(); 
        } catch (IOException e) { 
            e.printStackTrace(); 
        }       
        return updateInfo; 
    } 
} 

package com.cloay.update;

import java.io.IOException;
import java.io.InputStream;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
/**
 * 解析Xml文件
 * ParseXmlUtils.java
 * @author Cloay
 * 2011-11-7
 */
public class ParseXmlUtils {
 /**
  * 通过InputStream 解析文件
  * @param in
  * @return
  */
 public static UpdateInfo parseXml(InputStream in){
  UpdateInfo updateInfo = new UpdateInfo();
  DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();         
     DocumentBuilder db = null;     
     try {
   db = dbf.newDocumentBuilder();
   Document doc = null;   
   doc = db.parse(in);
   Element root = doc.getDocumentElement();
   NodeList resultNode = root.getElementsByTagName("info");   
   for(int i = 0; i < resultNode.getLength();i++){   
    Element res = (Element)resultNode.item(i); 
    updateInfo.setVersion(res.getElementsByTagName("version").item(0).getFirstChild().getNodeValue());
    updateInfo.setUrl(res.getElementsByTagName("url").item(0).getFirstChild().getNodeValue());
    updateInfo.setDescription(res.getElementsByTagName("description").item(0).getFirstChild().getNodeValue());
   }
  } catch (ParserConfigurationException e) {
   e.printStackTrace();
  } catch (SAXException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }     
  return updateInfo;
 }
}

updateInfo实体:


package com.cloay.update; 
/**
 * 更新信息实体类
 * UpdateInfo.java
 * @author Cloay
 * 2011-11-23
 */ 
public class UpdateInfo {   
    private String version;    //版本号  
    private String url;     //新版本存放url路径  
    private String description;   //更新说明信息,比如新增什么功能特性等  
    public String getVersion() {   
        return version;   
    }   
    public void setVersion(String version) {   
        this.version = version;   
    }   
    public String getUrl() {   
        return url;   
    }   
    public void setUrl(String url) {   
        this.url = url;   
    }   
    public String getDescription() {   
        return description;   
    }   
    public void setDescription(String description) {   
        this.description = description;   
    }   
}  
package com.cloay.update;
/**
 * 更新信息实体类
 * UpdateInfo.java
 * @author Cloay
 * 2011-11-23
 */
public class UpdateInfo { 
    private String version;    //版本号
    private String url;   //新版本存放url路径
    private String description;   //更新说明信息,比如新增什么功能特性等
    public String getVersion() { 
        return version; 
    } 
    public void setVersion(String version) { 
        this.version = version; 
    } 
    public String getUrl() { 
        return url; 
    } 
    public void setUrl(String url) { 
        this.url = url; 
    } 
    public String getDescription() { 
        return description; 
    } 
    public void setDescription(String description) { 
        this.description = description; 
    } 
}  </span>
获取当前已安装版本信息:


package com.cloay.update; 
 
import android.content.Context; 
import android.content.pm.PackageInfo; 
import android.content.pm.PackageManager; 
import android.content.pm.PackageManager.NameNotFoundException; 
 
/**
 * 版本工具类
 * VersionUtil.java
 * @author Cloay
 * 2011-11-23
 */ 
public class VersionUtil { 
    /**
     * 获取版本号
     * @param context
     *          上下文
     * @return
     * @throws NameNotFoundException 
     */ 
    public static String getVersionName(Context context) throws NameNotFoundException{ 
        //获取PackageManager 实例  
        PackageManager packageManager = context.getPackageManager(); 
        //获得context所属类的包名,0表示获取版本信息  
        PackageInfo packageInfo = packageManager.getPackageInfo(context.getPackageName(), 0); 
        return packageInfo.versionName; 
    } 
} 

package com.cloay.update;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;

/**
 * 版本工具类
 * VersionUtil.java
 * @author Cloay
 * 2011-11-23
 */
public class VersionUtil {
 /**
  * 获取版本号
  * @param context
  *    上下文
  * @return
  * @throws NameNotFoundException
  */
 public static String getVersionName(Context context) throws NameNotFoundException{
  //获取PackageManager 实例
  PackageManager packageManager = context.getPackageManager();
  //获得context所属类的包名,0表示获取版本信息
  PackageInfo packageInfo = packageManager.getPackageInfo(context.getPackageName(), 0);
  return packageInfo.versionName;
 }
}

其实整个过程并不是很麻烦,需要注释的地方都已详细注释了,就写那么多。有问题请留言大家一起交流学习!


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