android 检查软件是否有更新版本

import java.net.HttpURLConnection;

import java.net.URL;
import java.util.HashMap;

import com.yuxin.mhealth.R;
import com.yuxin.mhealth.http.action.BaseAction;
import com.yuxin.mhealth.ui.BaseActivity;
import com.yuxin.mhealth.utils.DialogUtil;
import com.yuxin.mhealth.utils.SysConstact;
import com.yuxin.mhealth.utils.SysDownloadUtils;

import android.annotation.SuppressLint;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.content.DialogInterface;

import android.content.DialogInterface.OnClickListener;
import android.content.pm.PackageManager.NameNotFoundException;

import android.os.Handler;
import android.os.Message;

/**
 * @description 软件更新


 */

public class UpdateManagerActivity extends BaseActivity {

 /* 保存解析的XML信息 */
 HashMap<String, String> mHashMap;
 

 private Context mContext;
 

 @SuppressLint("HandlerLeak")
 private Handler mHandler = new Handler() {
  public void handleMessage(Message msg) {
   switch (msg.what) {
   case 0x003:
    closeProgressDialog();
    // 显示新版本更新对话框
    showNoticeDialog();
    break;
   case 0x004:
    doProgressDialog("当前已经是最新版本!");
    closeProgressDialog();
    break;
   case 0x005:
    doProgressDialog("检查更新失败!");
    closeProgressDialog();
    break;
   default:
    break;
   }
  };
 };

 protected void onCreate(android.os.Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  mContext = this;
 };

 /**
  * 检测软件更新
  */
 public void checkUpdate() {
  switch (isUpdate()) {
  case 0:
   mHandler.sendEmptyMessage(0x005);
   break;
  case 1:
   // 显示提示对话框
   mHandler.sendEmptyMessage(0x003);
   break;
  case 2:
   mHandler.sendEmptyMessage(0x004);
   break;
  default:
   break;
  }

 }

 /**
  * 检查软件是否有更新版本
  *
  * @return
  * @throws Exception
  */
 private int isUpdate() {
  // 获取当前软件版本
  int versionCode = getVersionCode(mContext);
  URL url;

  // 获取，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 {

   url = new URL(BaseAction.getUploadUrl(this));
   HttpURLConnection con = (HttpURLConnection) url.openConnection();
   mHashMap = service.parseXml(con.getInputStream());
  } catch (Exception e) {
   e.printStackTrace();
  }
  if (null != mHashMap) {
   SysConstact.Log("版本" + mHashMap.get("version"));
   int serviceCode = Integer.valueOf(mHashMap.get("version").trim());
   // 版本判断
   if (serviceCode > versionCode) {
    return 1;
   } else {
    return 2;
   }
  }
  return 0;
 }

 /**
  * 获取软件版本号
  *
  * @param context
  *            context
  * @return
  */
 private int getVersionCode(Context context) {
  int versionCode = 0;
  try {
   String packageName = context.getPackageName();
   // 获取软件版本号，对应AndroidManifest.xml下android:versionCode
   versionCode = context.getPackageManager().getPackageInfo(
     packageName, 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) {
      
      // 显示下载对话框
      DialogUtil.toast(getApplicationContext(), "下载已经开始,可以在通知栏查看进度!");
      SysDownloadUtils.start(getApplicationContext(), mHashMap.get("url").trim(),mHashMap.get("name").trim());
      dialog.dismiss();
     }
    });
  // 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();
 }

}