Android解析XML文件升级APK的方法

public class DownLoadApk {
 public static SharedPreferences sharedPrederences = null;
 //启动安装界面
 public static void DownId(Context context, long downId){
  DownloadManager mDownloadManager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
  Uri downloadUri = mDownloadManager.getUriForDownloadedFile(downId);
  startInstall(context, downloadUri);
 }
 /**
  * 跳转到安装界面
  * @param context 作用域
  * @param uri 包名
  */
 private static void startInstall(Context context, Uri uri) {
  Intent install = new Intent(Intent.ACTION_VIEW);
  install.setDataAndType(uri, "application/vnd.android.package-archive");
  install.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
  context.startActivity(install);
 }
 //删除文件
 public static boolean fileDelete(String filePath) {
  File file = new File(filePath);
  if (file.exists() == false) {
   return false;
  }
  return file.delete();
 }

Thread thread = new Thread() {
 @Override
 public void run() {
  super.run();
  //XML存放在ftp服务器的地址
  String path = FileUtils.getDevice_address()+"News.XML";
  try {
   URL url = new URL(path);
   HttpURLConnection conn = (HttpURLConnection) url
     .openConnection();
   conn.setRequestMethod("GET");
   conn.setConnectTimeout(5000);
   conn.setReadTimeout(5000);
   //发送http GET请求，获取相应码
   if (conn.getResponseCode() == 200) {
    InputStream is = conn.getInputStream();
    //使用pull解析器，开始解析这个流
    parseNewsXml(is);
   }
  } catch (Exception e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
 }
};
thread.start(); 

private void parseNewsXml(InputStream is) {
 XmlPullParser xp = Xml.newPullParser();
 try {
  xp.setInput(is, "utf-8");
  //对节点的事件类型进行判断，就可以知道当前节点是什么节点
  int type = xp.getEventType();
  News news = null;
  while (type != XmlPullParser.END_DOCUMENT) {
   switch (type) {
    case XmlPullParser.START_TAG:
     if ("newslist".equals(xp.getName())) {
      newsList = new ArrayList<>();
      break;
     } else if ("news".equals(xp.getName())) {
      news = new News();
      break;
     } else if ("name".equals(xp.getName())) {
      String name = xp.nextText();
      news.setName(name);
      break;
     } else if ("code".equals(xp.getName())) {
      String code = xp.nextText();
      news.setCode(code);
      break;
     }
    case XmlPullParser.END_TAG:
     if ("news".equals(xp.getName())) {
      newsList.add(news);
     }
     break;
     default:
     break;
   }
   //解析完当前节点后，把指针移动至下一个节点，直至节点完毕，并返回它的事件类型
   type = xp.next();
  }
  // 发消息
  handler.sendEmptyMessage(1);
 } catch (Exception e) {
  e.printStackTrace();
 }
}

//获取下载管理器
DownloadManager manager =(DownloadManager)mContext.getSystemService(mContext.DOWNLOAD_SERVICE);
handler = new Handler() {
 @Override
 public void handleMessage(Message msg) {
  super.handleMessage(msg);
  News news = newsList.get(0);
  Log.i("aii", "XML: "+news.getCode()+"，apk:"+getPackageInfo(mContext));
  if(Integer.valueOf(news.getCode())>Integer.valueOf(getPackageInfo(mContext))){
   if(dowmCliek) {
    //开启进度条线程
    isRun = true;
    dowmCliek = false;
    //更新APK前删除原来的安装包
    DownLoadApk.fileDelete(path + "/" + mAPK);
    //创建下载请求
    DownloadManager.Request down = new DownloadManager.Request(
      Uri.parse(mWebsite));
    //设置允许使用的网络类型，这里是移动网络和wifi都可以
    down.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_MOBILE | DownloadManager.Request.NETWORK_WIFI);
    //禁止发出通知，既后台下载
    down.setShowRunningNotification(true);
    //不显示下载界面
    down.setVisibleInDownloadsUi(true);
    //标题
    down.setDestinationInExternalFilesDir(mContext, null, "XXX升级中...");
    //将下载请求放入队列，返回下载id
    downId = manager.enqueue(down);
   }else{
    Toast.makeText(mContext,"升级中...",Toast.LENGTH_SHORT).show();
   }
  }else{
    Toast.makeText(mContext,"已是最新版本无需升级...",Toast.LENGTH_SHORT).show();
  }
 }
};

//定时任务
ScheduledExecutorService scheduledExecutorService = Executors.newScheduledThreadPool(1);
scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
   @Override
   public void run() {
    if(isRun) {
     Message msg = mHandler.obtainMessage();
     msg.what = 1;
     mHandler.sendMessage(msg);
    }
   }
  }, 0, 100, TimeUnit.MILLISECONDS);//延迟0，间隔100，单位毫秒
private Handler mHandler = new Handler(new Handler.Callback() {
 @Override
 public boolean handleMessage(Message msg) {
  switch (msg.what) {
   case 1:
    //android下载管理器
    DownloadManager.Query query = new DownloadManager.Query().setFilterById(downId);
    Cursor cursor = manager.query(query);
    if (cursor != null && cursor.moveToFirst()) {
     //此处直接查询文件大小
     long downSize = cursor.getLong(cursor.getColumnIndex(
       DownloadManager.COLUMN_TOTAL_SIZE_BYTES));
     //获取文件下载总大小
     fileTotalSize =cursor.getLong(cursor.getColumnIndex(
       DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR));
     cursor.close();

     Log.w("打印", "总大小" + downSize);
     Log.w("打印", "下载进度 " + fileTotalSize);
     if (fileTotalSize>0) {
      NumberFormat numberFormat = NumberFormat.getInstance();
      numberFormat.setMaximumFractionDigits(2);
      String result = numberFormat.format((float)fileTotalSize/(float)downSize*100);
      Log.w("打印", "downloaded size: " + result+"%");
      downBtn.setText(result+"%");
     }
     //下载完毕
     if(fileTotalSize==downSize) {
      isRun = false;
      downBtn.setText("点击升级");
     }
    }
  }
  return true;
 }
});

DownloadCompleteReceiver receiver = new DownloadCompleteReceiver();
//下载完成后的广播
class DownloadCompleteReceiver extends BroadcastReceiver {
 @Override
 public void onReceive(Context context, Intent intent) {
  if(intent.getAction().equals(DownloadManager.ACTION_DOWNLOAD_COMPLETE)){
   long downId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);
   if(downId!=-1) {
    //启动安装
    DownLoadApk.DownId(context,downId);
    dowmCliek=true;
   }
  }else{
   Toast.makeText(context, intent.getAction()+"下载失败", Toast.LENGTH_SHORT).show();
  }
 }
}
//启动下载完成广播
mContext.registerReceiver(receiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));

private static String getPackageInfo(Context context) {
 PackageInfo pi = null;
 try {
  PackageManager pm = context.getPackageManager();
  pi = pm.getPackageInfo(context.getPackageName(),
    PackageManager.GET_CONFIGURATIONS);
  return pi.versionCode+"";
 } catch (Exception e) {
  e.printStackTrace();
 }
 return null;
}