Android应用程序更新并下载实例

import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import com.af.mobile.R;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.DialogInterface.OnClickListener;
import android.content.pm.PackageManager.NameNotFoundException;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.Toast;


public class UpdateManager
{private URL url=null;
  /* 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()
  {
    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;
  }

  public void checkUpdate()
  {
    if (isUpdate())
    {
      showNoticeDialog();
    } else
    {
      
    }
  }

  /**
   * 检查软件是否有更新版本
   * 
   * @return
   */
  private boolean isUpdate()
  {
    // 获取当前软件版本
    Double versionCode = getVersionCode(mContext);
  
      Double serviceCode = 1.2;
      // 版本判断
      if (serviceCode > versionCode)
      {
        return true;
      }
    
    return false;
  }

  // 获取软件版本号
  
  private Double getVersionCode(Context context)
  {
    Double versionCode = 0.0;
    try
    {
      // 获取软件版本号，对应AndroidManifest.xml下android:versionCode
      versionCode = (double) context.getPackageManager().getPackageInfo("com.af.mobile", 0).versionCode;
    } catch (NameNotFoundException e)
    {
      e.printStackTrace();
    }
    return versionCode;
  }

  
   //显示软件更新对话框
  
  private void showNoticeDialog()
  {
    AlertDialog.Builder builder = new Builder(mContext);
    builder.setTitle("软件更新");
    String string=download("http://192.168.0.102:9313/daojuserver/uploads/version.xml");//xml的下载地址
    builder.setMessage(string);

    builder.setPositiveButton("更新", 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("稍后更新", 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("djfkjd");//提示信息内容
    // 给下载对话框增加进度条
    final LayoutInflater inflater = LayoutInflater.from(mContext);
    View v = inflater.inflate(R.layout.softupdate_progress, null);
    mProgress = (ProgressBar) v.findViewById(R.id.update_progress);
    builder.setView(v);
    // 取消更新
    builder.setNegativeButton("取消更新", 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();
  }


  private void downloadApk()
  {
    // 启动新线程下载软件
    new downloadApkThread().start();
  }

  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("http://192.168.0.102:9313/daojuserver/uploads/SpMobile.apk");//apk下载地址地址
          // 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);
          if (!file.exists())
          {
            file.mkdir();
          }
          File apkFile = new File(mSavePath, "dhfudh");
          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)
            {
              mHandler.sendEmptyMessage(DOWNLOAD_FINISH);
              break;
            }
            fos.write(buf, 0, numread);
          } while (!cancelUpdate);
          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();
    }
  };
  
  private void installApk()
  {
    File apkfile = new File(mSavePath, "dhfudh");
    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);
  }
  public String download(String urlString)
  {
    StringBuffer sbBuffer=new StringBuffer();
    String line=null;
    BufferedReader buffer=null;
  try {
    url=new URL(urlString);
    HttpURLConnection urlConn=(HttpURLConnection) url.openConnection();
    buffer=new BufferedReader(new InputStreamReader(urlConn.getInputStream()));
    while((line=buffer.readLine())!=null)
    {
      sbBuffer.append(line);
    }
  } catch (Exception e) {
    // TODO: handle exception
    e.printStackTrace();
  }
  finally
  {
    try {
      buffer.close();
    } catch (Exception e2) {
      // TODO: handle exception
      e2.printStackTrace();
    }
  }
  return sbBuffer.toString();
  }
}

if(isOpenNetwork())//判断是否有网络
    {
      UpdateManager manager = new  UpdateManager(Main.this);
    // 检查软件更新
    manager.checkUpdate();
      
    }

private boolean isOpenNetwork() {
    ConnectivityManager connManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = connManager.getActiveNetworkInfo();

    if (networkInfo != null) {
      // 2.获取当前网络连接的类型信息
      int networkType = networkInfo.getType();
      if (ConnectivityManager.TYPE_WIFI == networkType) {
        // 当前为wifi网络
      } else if (ConnectivityManager.TYPE_MOBILE == networkType) {
        // 当前为mobile网络
      }
      return connManager.getActiveNetworkInfo().isAvailable();
    }

    return false;
  }