首先是本地:

    ParseXmlService部分:

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package com.szy.update;
 
import java.io.InputStream;
import java.util.HashMap;
 
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
 
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
 
/**
 *@author coolszy
 *@date 2012-4-26
 *@blog http://blog.92coding.com
 */
public class ParseXmlService
{
    public HashMap<String, String> parseXml(InputStream inStream) throws Exception
    {
        HashMap<String, String> hashMap = new HashMap<String, String>();
         
        // 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;
    }
}

    UpdateManager部分:

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package com.gaoxiaotongctone.update;
 
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
 
import com.gaoxiaotongctone.R;
 
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.res.Resources.NotFoundException;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ProgressBar;
 
public class UpdateManager {
    /* 下载中 */
    private static final int DOWNLOAD = 1;
    /* 下载结束 */
    private static final int DOWNLOAD_FINISH = 2;
    /* 保存解析的XML信息 */
    HashMap<String, String> mHashMap;
    /* 下载保存路径 */
    private String mSavePath;
    /* 记录进度条数量 */
    private int progress;
    /* 是否取消更新 */
    private boolean cancelUpdate = false;
 
    private Context mContext;
    /* 更新进度条 */
    private ProgressBar mProgress;
    private Dialog mDownloadDialog;
 
    private Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
            // 正在下载
            case DOWNLOAD:
                // 设置进度条位置
                mProgress.setProgress(progress);
                break;
            case DOWNLOAD_FINISH:
                // 安装文件
                installApk();
                break;
            default:
                break;
            }
        };
    };
 
    public UpdateManager(Context context) {
        this.mContext = context;
    }
 
    /**
     * 检测软件更新
     
     * @throws IOException
     * @throws NotFoundException
     */
    public void checkUpdate() throws NotFoundException, IOException {
        new Thread(new Runnable() {
 
            @Override
            public void run() {
                // TODO Auto-generated method stub
 
                try {
                    if (isUpdate()) {
                        // 显示提示对话框
                        Looper.prepare();
                        showNoticeDialog();
                        Looper.loop();
                        Log.d("消息", "有新版本");
                    } else {
                        // Toast.makeText(mContext, R.string.soft_update_no,
                        // Toast.LENGTH_LONG).show();
 
                        Log.d("消息", "已是最新版本");
                    }
                } catch (NotFoundException e) {
                    // TODO Auto-generated catch block
                    //Toast.makeText(UpdateManager.this, "QQ空间", 2).show();
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
 
            }
        }).start();
    }
 
    /**
     * 检查软件是否有更新版本
     
     * @return
     * @throws IOException
     */
    private boolean isUpdate() throws IOException {
        // 获取当前软件版本
        int versionCode = getVersionCode(mContext);
        // 把version.xml放到src,然后获取文件信息
 
        InputStream inStream =
      ParseXmlService.class.getClassLoader().getResourceAsStream("version.xml");
        InputStream inStream = urlConn.getInputStream();
        // 解析XML文件。 由于XML文件比较小,因此使用DOM方式进行解析
        ParseXmlService service = new ParseXmlService();
        try {
            mHashMap = service.parseXml(inStream);
        } catch (Exception e) {
            e.printStackTrace();
        }
        if (null != mHashMap) {
            int serviceCode = Integer.valueOf(mHashMap.get("version"));// String.valueOf("serviceCode"+"---"+serviceCode)
            // Toast.makeText(UpdateManager.this,'', Toast.LENGTH_SHORT).show();
            Log.i("-----serviceCode", "" + serviceCode);
            Log.i("-----versionCode", "" + versionCode);
 
            // 版本判断
            if (serviceCode > versionCode) {
                return true;
            }
        } else {
            Log.i("-----null == mHashMap", "null == mHashMap");
        }
 
        return false;
    }
 
    /**
     * 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,对应AndroidManifest.xml下android:versionCode
            versionCode = context.getPackageManager().getPackageInfo(
                    "com.gaoxiaotongctone", 0).versionCode;
        } catch (NameNotFoundException e) {
            e.printStackTrace();
        }
        return versionCode;
    }
 
    /**
     * 显示软件更新对话框
     */
    private void showNoticeDialog() {
        // 构造对话框
        AlertDialog.Builder builder = new Builder(mContext);
        builder.setTitle(R.string.soft_update_title);
        builder.setMessage(R.string.soft_update_info);
        // 更新
        builder.setPositiveButton(R.string.soft_update_updatebtn,
                new OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                        // 显示下载对话框
                        showDownloadDialog();
                    }
                });
        // 稍后更新
        builder.setNegativeButton(R.string.soft_update_later,
                new OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                    }
                });
        Dialog noticeDialog = builder.create();
        noticeDialog.show();
    }
 
    /**
     * 显示软件下载对话框
     */
    private void showDownloadDialog() {
        // 构造软件下载对话框
        AlertDialog.Builder builder = new Builder(mContext);
        builder.setTitle(R.string.soft_updating);
        // 给下载对话框增加进度条
        final LayoutInflater inflater = LayoutInflater.from(mContext);
        View v = inflater.inflate(R.layout.sotfupdate_progress, null);
        mProgress = (ProgressBar) v.findViewById(R.id.update_progress);
        builder.setView(v);
        // 取消更新
        builder.setNegativeButton(R.string.soft_update_cancel,
                new OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                        // 设置取消状态
                        cancelUpdate = true;
                    }
                });
        mDownloadDialog = builder.create();
        mDownloadDialog.show();
        // 现在文件
        downloadApk();
    }
 
    /**
     * 下载apk文件
     */
    private void downloadApk() {
        // 启动新线程下载软件
        new downloadApkThread().start();
    }
 
    /**
     * 下载文件线程
     */
    private class downloadApkThread extends Thread {
        @Override
        public void run() {
            try {
                // 判断SD卡是否存在,并且是否具有读写权限
                if (Environment.getExternalStorageState().equals(
                        Environment.MEDIA_MOUNTED)) {
                    // 获得存储卡的路径
                    String sdpath = Environment.getExternalStorageDirectory()
                            + "/";
                    mSavePath = sdpath + "download";
                    URL url = new URL(mHashMap.get("url"));
                    // 创建连接
                    HttpURLConnection conn = (HttpURLConnection) url
                            .openConnection();
                    conn.connect();
                    // 获取文件大小
                    int length = conn.getContentLength();
                    // 创建输入流
                    InputStream is = conn.getInputStream();
 
                    File file = new File(mSavePath);
                    // 判断文件目录是否存在
                    if (!file.exists()) {
                        file.mkdir();
                    }
                    File apkFile = new File(mSavePath, mHashMap.get("name"));
                    FileOutputStream fos = new FileOutputStream(apkFile);
                    int count = 0;
                    // 缓存
                    byte buf[] = new byte[1024];
                    // 写入到文件中
                    do {
                        int numread = is.read(buf);
                        count += numread;
                        // 计算进度条位置
                        progress = (int) (((float) count / length) * 100);
                        // 更新进度
                        mHandler.sendEmptyMessage(DOWNLOAD);
                        if (numread <= 0) {
                            // 下载完成
                            mHandler.sendEmptyMessage(DOWNLOAD_FINISH);
                            break;
                        }
                        // 写入文件
                        fos.write(buf, 0, numread);
                    } while (!cancelUpdate);// 点击取消就停止下载.
                    fos.close();
                    is.close();
                }
            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            // 取消下载对话框显示
            mDownloadDialog.dismiss();
        }
    };
 
    /**
     * 安装APK文件
     */
    private void installApk() {
        File apkfile = new File(mSavePath, mHashMap.get("name"));
        if (!apkfile.exists()) {
            return;
        }
        // 通过Intent安装APK文件
        Intent i = new Intent(Intent.ACTION_VIEW);
        i.setDataAndType(Uri.parse("file://" + apkfile.toString()),
                "application/vnd.android.package-archive");
        mContext.startActivity(i);
    }
}

    MainActivity.java部分:

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        @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        UpdateManager manager = new UpdateManager(MainActivity.this);
        manager.checkUpdate();
  
    }

    别忘了xml中给权限。

wKioL1OliALQ3KNnAABiyUa6d1k333.jpg

    version.xml部分:

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<update>
    <version>2</version>
    <name>彩通科技</name>
    <url>http://imp.ctone.net/Frame/ctone.apk</url>
</update>

        网络链接UpdateManager.java部分:

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package com.gaoxiaotongctone.update;
 
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
 
import com.gaoxiaotongctone.R;
 
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.res.Resources.NotFoundException;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ProgressBar;
 
public class UpdateManager {
    /* 下载中 */
    private static final int DOWNLOAD = 1;
    /* 下载结束 */
    private static final int DOWNLOAD_FINISH = 2;
    /* 保存解析的XML信息 */
    HashMap<String, String> mHashMap;
    /* 下载保存路径 */
    private String mSavePath;
    /* 记录进度条数量 */
    private int progress;
    /* 是否取消更新 */
    private boolean cancelUpdate = false;
 
    private Context mContext;
    /* 更新进度条 */
    private ProgressBar mProgress;
    private Dialog mDownloadDialog;
 
    private Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
            // 正在下载
            case DOWNLOAD:
                // 设置进度条位置
                mProgress.setProgress(progress);
                break;
            case DOWNLOAD_FINISH:
                // 安装文件
                installApk();
                break;
            default:
                break;
            }
        };
    };
 
    public UpdateManager(Context context) {
        this.mContext = context;
    }
 
    /**
     * 检测软件更新
     
     * @throws IOException
     * @throws NotFoundException
     */
    public void checkUpdate() throws NotFoundException, IOException {
        new Thread(new Runnable() {
 
            @Override
            public void run() {
                // TODO Auto-generated method stub
 
                try {
                    if (isUpdate()) {
                        // 显示提示对话框
                        Looper.prepare();
                        showNoticeDialog();
                        Looper.loop();
                        Log.d("消息", "有新版本");
                    } else {
                        // Toast.makeText(mContext, R.string.soft_update_no,
                        // Toast.LENGTH_LONG).show();
 
                        Log.d("消息", "已是最新版本");
                    }
                } catch (NotFoundException e) {
                    // TODO Auto-generated catch block
                    //Toast.makeText(UpdateManager.this, "QQ空间", 2).show();
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
 
            }
        }).start();
    }
 
    /**
     * 检查软件是否有更新版本
     
     * @return
     * @throws IOException
     */
    private boolean isUpdate() throws IOException {
        // 获取当前软件版本
        int versionCode = getVersionCode(mContext);
        // 把version.xml放到网络上,然后获取文件信息
        URL url = new URL("http://imp.ctone.net/Frame/version.xml");
        HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();
        InputStream inStream = urlConn.getInputStream();
        // 解析XML文件。 由于XML文件比较小,因此使用DOM方式进行解析
        ParseXmlService service = new ParseXmlService();
        try {
            mHashMap = service.parseXml(inStream);
        } catch (Exception e) {
            e.printStackTrace();
        }
        if (null != mHashMap) {
            int serviceCode = Integer.valueOf(mHashMap.get("version"));// String.valueOf("serviceCode"+"---"+serviceCode)
            // Toast.makeText(UpdateManager.this,'', Toast.LENGTH_SHORT).show();
            Log.i("-----serviceCode", "" + serviceCode);
            Log.i("-----versionCode", "" + versionCode);
 
            // 版本判断
            if (serviceCode > versionCode) {
                return true;
            }
        } else {
            Log.i("-----null == mHashMap", "null == mHashMap");
        }
 
        return false;
    }
 
    /**
     * 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,对应AndroidManifest.xml下android:versionCode
            versionCode = context.getPackageManager().getPackageInfo(
                    "com.gaoxiaotongctone", 0).versionCode;
        } catch (NameNotFoundException e) {
            e.printStackTrace();
        }
        return versionCode;
    }
 
    /**
     * 显示软件更新对话框
     */
    private void showNoticeDialog() {
        // 构造对话框
        AlertDialog.Builder builder = new Builder(mContext);
        builder.setTitle(R.string.soft_update_title);
        builder.setMessage(R.string.soft_update_info);
        // 更新
        builder.setPositiveButton(R.string.soft_update_updatebtn,
                new OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                        // 显示下载对话框
                        showDownloadDialog();
                    }
                });
        // 稍后更新
        builder.setNegativeButton(R.string.soft_update_later,
                new OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                    }
                });
        Dialog noticeDialog = builder.create();
        noticeDialog.show();
    }
 
    /**
     * 显示软件下载对话框
     */
    private void showDownloadDialog() {
        // 构造软件下载对话框
        AlertDialog.Builder builder = new Builder(mContext);
        builder.setTitle(R.string.soft_updating);
        // 给下载对话框增加进度条
        final LayoutInflater inflater = LayoutInflater.from(mContext);
        View v = inflater.inflate(R.layout.sotfupdate_progress, null);
        mProgress = (ProgressBar) v.findViewById(R.id.update_progress);
        builder.setView(v);
        // 取消更新
        builder.setNegativeButton(R.string.soft_update_cancel,
                new OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                        // 设置取消状态
                        cancelUpdate = true;
                    }
                });
        mDownloadDialog = builder.create();
        mDownloadDialog.show();
        // 现在文件
        downloadApk();
    }
 
    /**
     * 下载apk文件
     */
    private void downloadApk() {
        // 启动新线程下载软件
        new downloadApkThread().start();
    }
 
    /**
     * 下载文件线程
     */
    private class downloadApkThread extends Thread {
        @Override
        public void run() {
            try {
                // 判断SD卡是否存在,并且是否具有读写权限
                if (Environment.getExternalStorageState().equals(
                        Environment.MEDIA_MOUNTED)) {
                    // 获得存储卡的路径
                    String sdpath = Environment.getExternalStorageDirectory()
                            + "/";
                    mSavePath = sdpath + "download";
                    URL url = new URL(mHashMap.get("url"));
                    // 创建连接
                    HttpURLConnection conn = (HttpURLConnection) url
                            .openConnection();
                    conn.connect();
                    // 获取文件大小
                    int length = conn.getContentLength();
                    // 创建输入流
                    InputStream is = conn.getInputStream();
 
                    File file = new File(mSavePath);
                    // 判断文件目录是否存在
                    if (!file.exists()) {
                        file.mkdir();
                    }
                    File apkFile = new File(mSavePath, mHashMap.get("name"));
                    FileOutputStream fos = new FileOutputStream(apkFile);
                    int count = 0;
                    // 缓存
                    byte buf[] = new byte[1024];
                    // 写入到文件中
                    do {
                        int numread = is.read(buf);
                        count += numread;
                        // 计算进度条位置
                        progress = (int) (((float) count / length) * 100);
                        // 更新进度
                        mHandler.sendEmptyMessage(DOWNLOAD);
                        if (numread <= 0) {
                            // 下载完成
                            mHandler.sendEmptyMessage(DOWNLOAD_FINISH);
                            break;
                        }
                        // 写入文件
                        fos.write(buf, 0, numread);
                    } while (!cancelUpdate);// 点击取消就停止下载.
                    fos.close();
                    is.close();
                }
            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            // 取消下载对话框显示
            mDownloadDialog.dismiss();
        }
    };
 
    /**
     * 安装APK文件
     */
    private void installApk() {
        File apkfile = new File(mSavePath, mHashMap.get("name"));
        if (!apkfile.exists()) {
            return;
        }
        // 通过Intent安装APK文件
        Intent i = new Intent(Intent.ACTION_VIEW);
        i.setDataAndType(Uri.parse("file://" + apkfile.toString()),
                "application/vnd.android.package-archive");
        mContext.startActivity(i);
    }
}

    附效果图:

wKiom1OljsyyJWHrAAG3r7rIR30368.jpg

wKioL1OljqaD7GQpAAVBNhVuN_w846.jpg

wKiom1Oljt7DqpLlAAZ5qh8UnXg506.jpg

wKioL1OljrqxgjtAAAWH4oTR7YE223.jpg

wKiom1Oljz_R-nShAAA6xb6BEGU509.jpg

    好好学习,好好活着。