調用android自帶的下載功能，進度在消息通知欄上顯示

public class CompleteReceiver extends BroadcastReceiver
{

 private DownloadManager downloadManager = null;

 @Override
 public void onReceive(Context context, Intent intent)
 {
     try {
  String action = intent.getAction();
  if (action.equals(DownloadManager.ACTION_DOWNLOAD_COMPLETE))
  {
   long id = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, 0); // TODO
   // 判斷這個id與以前的id是否相等，若是相等說明是以前的那個要下載的文件
   Query query = new Query();
   query.setFilterById(id);
   downloadManager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
   Cursor cursor = downloadManager.query(query);

   int columnCount = cursor.getColumnCount();
   String path = null; // TODO 這裏把全部的列都打印一下，有什麼需求，就怎麼處理,文件的本地路徑就是path
   String local_fileName=null;
   while (cursor.moveToNext())
   {
    for (int j = 0; j < columnCount; j++)
    {
     String columnName = cursor.getColumnName(j);
     String string = cursor.getString(j);
     // 輸出
     output(context, columnName, string);
     if (columnName.equals("local_uri"))
     {
      path = string;
     } else if (columnName.equals("local_filename")){
      local_fileName=string;
     } else {
          //
     }
    }
   }
   cursor.close();
   // 若是sdcard不可用時下載下來的文件，那麼這裏將是一個內容提供者的路徑，這裏打印出來，有什麼需求就怎麼樣處理
   if (path != null && path.startsWith("content:"))
   {
    cursor = context.getContentResolver().query(Uri.parse(path), null, null, null, null);
    columnCount = cursor.getColumnCount();
    while (cursor.moveToNext())
    {
     for (int j = 0; j < columnCount; j++)
     {
      String columnName = cursor.getColumnName(j);
      String string = cursor.getString(j);
      // 輸出
      output(context, columnName, string);
     }
    }
    cursor.close();
   }
   if (Common.isNotNull(local_fileName)) {
           String worksheetId = local_fileName.substring(local_fileName.lastIndexOf("/")+1,local_fileName.lastIndexOf("."));
           if (local_fileName != null && local_fileName.substring(local_fileName.lastIndexOf(".")+1).equals("apk"))
           {
            install(context, local_fileName);
           }else if (local_fileName!= null && local_fileName.substring(local_fileName.lastIndexOf(".")+1).equals("db") && !worksheetId.equalsIgnoreCase(IConstant.OFFLINE_PUB_DB_NAME)) {
            new WorksheetService().updateOfflineStatues(context, worksheetId, "1");
            Toast.makeText(context, "離線數據包下載已完成", Toast.LENGTH_SHORT).show();
           } else {
               //
           }
   }
  } else if (action.equals(DownloadManager.ACTION_NOTIFICATION_CLICKED))
  {
   //點擊了notification後的操做
  }
     } catch (Exception er) {
  Log.error("資源下載異常", er);
     }
 }
 

public class DownLoadNewApk {
    private static final Logger Log = LoggerFactory.getLogger(WService.class);

    public DownLoadNewApk(Context context) {
 this.context = context;
    }

    private Context context;

    public void getDownLoad(String url) {
 try {
     @SuppressWarnings("static-access")
     DownloadManager downloadManager = (DownloadManager) context.getSystemService(context.DOWNLOAD_SERVICE);
     url = url.replace("HTTP", "http");
     Uri uri = Uri.parse(url);
     Request request = new Request(uri);

     // 設置容許使用的網絡類型，這裏是移動網絡和wifi均可以
     request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_MOBILE | DownloadManager.Request.NETWORK_WIFI);

     // 禁止發出通知，既後臺下載，若是要使用這一句必須聲明一個權限：android.permission.DOWNLOAD_WITHOUT_NOTIFICATION
     // request.setShowRunningNotification(false);

     // 不顯示下載界面
     request.setVisibleInDownloadsUi(true);

     request.setDescription("下載中...");

     request.setMimeType("application/com.trinea.download.file");

     /*      * 設置下載後文件存放的位置,若是sdcard不可用，那麼設置這個將報錯，所以最好不設置。      * 若是sdcard可用，下載後的文件在/mnt/sdcard/Android/data/packageName/files目錄下面。      * 若是sdcard不可用,設置了下面這個將報錯，不設置，下載後的文件在/cache這個 目錄下面      */     if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {  request.setDestinationInExternalPublicDir("/download/", url.substring(url.lastIndexOf("/") + 1));     }     downloadManager.enqueue(request);     // TODO 把id保存好，在接收者裏面要用，最好保存在Preferences裏面 } catch (Exception er) {     Log.error("", er); }    }