public class DownLoadApk { public static SharedPreferences sharedPrederences = null; //啟動安裝界面 public static void DownId(Context context, long downId){  DownloadManager mDownloadManager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);  Uri downloadUri = mDownloadManager.getUriForDownloadedFile(downId);  startInstall(context, downloadUri); } /**  * 跳轉到安裝界面  * @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); } //刪除文件 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服務器的地址  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);   //發送http GET請求，獲取相應碼   if (conn.getResponseCode() == 200) {    InputStream is = conn.getInputStream();    //使用pull解析器，開始解析這個流    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");  //對節點的事件類型進行判斷，就可以知道當前節點是什么節點  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;   }   //解析完當前節點后，把指針移動至下一個節點，直至節點完畢，并返回它的事件類型   type = xp.next();  }  // 發消息  handler.sendEmptyMessage(1); } catch (Exception e) {  e.printStackTrace(); }}

//獲取下載管理器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) {    //開啟進度條線程    isRun = true;    dowmCliek = false;    //更新APK前刪除原來的安裝包    DownLoadApk.fileDelete(path + "/" + mAPK);    //創建下載請求    DownloadManager.Request down = new DownloadManager.Request(      Uri.parse(mWebsite));    //設置允許使用的網絡類型，這里是移動網絡和wifi都可以    down.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_MOBILE | DownloadManager.Request.NETWORK_WIFI);    //禁止發出通知，既后臺下載    down.setShowRunningNotification(true);    //不顯示下載界面    down.setVisibleInDownloadsUi(true);    //標題    down.setDestinationInExternalFilesDir(mContext, null, "XXX升級中...");    //將下載請求放入隊列，返回下載id    downId = manager.enqueue(down);   }else{    Toast.makeText(mContext,"升級中...",Toast.LENGTH_SHORT).show();   }  }else{    Toast.makeText(mContext,"已是最新版本無需升級...",Toast.LENGTH_SHORT).show();  } }};

//定時任務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);//延遲0，間隔100，單位毫秒private Handler mHandler = new Handler(new Handler.Callback() { @Override public boolean handleMessage(Message msg) {  switch (msg.what) {   case 1:    //android下載管理器    DownloadManager.Query query = new DownloadManager.Query().setFilterById(downId);    Cursor cursor = manager.query(query);    if (cursor != null && cursor.moveToFirst()) {     //此處直接查詢文件大小     long downSize = cursor.getLong(cursor.getColumnIndex(       DownloadManager.COLUMN_TOTAL_SIZE_BYTES));     //獲取文件下載總大小     fileTotalSize =cursor.getLong(cursor.getColumnIndex(       DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR));     cursor.close();     Log.w("打印", "總大小" + downSize);     Log.w("打印", "下載進度 " + 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+"%");     }     //下載完畢     if(fileTotalSize==downSize) {      isRun = false;      downBtn.setText("點擊升級");     }    }  }  return true; }});

DownloadCompleteReceiver receiver = new DownloadCompleteReceiver();//下載完成后的廣播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) {    //啟動安裝    DownLoadApk.DownId(context,downId);    dowmCliek=true;   }  }else{   Toast.makeText(context, intent.getAction()+"下載失敗", Toast.LENGTH_SHORT).show();  } }}//啟動下載完成廣播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;}