如何检查下载是否正在运行？ DownloadManager

问题描述：

我想检查下载是否正在运行。我使用的代码波纹管：如何检查下载是否正在运行？ DownloadManager

public static boolean isDownloading(Context context){ 

    DownloadManager.Query query = null; 
    Cursor c = null; 
    DownloadManager downloadManager = null; 
    downloadManager = (DownloadManager)context.getSystemService(Context.DOWNLOAD_SERVICE); 
    query = new DownloadManager.Query(); 
    if(query!=null) { 

     //return true; 
     query.setFilterByStatus(DownloadManager.STATUS_FAILED|DownloadManager.STATUS_PAUSED|DownloadManager.STATUS_SUCCESSFUL| 
       DownloadManager.STATUS_RUNNING|DownloadManager.STATUS_PENDING); 
    } else { 
     Log.i("AUTOMATION_DOW" , "NO "); 
     return false; 
    } 
    c = downloadManager.query(query); 
    if(c.moveToFirst()) { 
     int status = c.getInt(c.getColumnIndex(DownloadManager.COLUMN_STATUS)); 
     switch(status) { 
      case DownloadManager.STATUS_PAUSED: 
       Log.i("AUTOMATION_DOWNLOAD","PAUSED"); 
       break; 
      case DownloadManager.STATUS_PENDING: 
       Log.i("AUTOMATION_DOWNLOAD","PENDING"); 
       break; 
      case DownloadManager.STATUS_RUNNING: 
       Log.i("AUTOMATION_DOWNLOAD","RUNNING"); 
       break; 
      case DownloadManager.STATUS_SUCCESSFUL: 
       Log.i("AUTOMATION_DOWNLOAD","SUCCESSFUL"); 
       break; 
      case DownloadManager.STATUS_FAILED: 
       Log.i("AUTOMATION_DOWNLOAD","FAILED"); 
       break; 
     } 
    } 
    Log.i("AUTOMATION_DOWNLOAD","DEFAULT"); 
    c.close(); 
    return true; 
}

我已经即使下载运行下面的logcat：09-04 09:39:42.381 30213-31215/com.bytel.velizy.automation I/AUTOMATION_DOWNLOAD: DEFAULT 我试图减少以前的代码到这一点，但没有奏效。

DownloadManager.Query query = null; 
Cursor c = null; 
DownloadManager downloadManager = null; 
downloadManager = (DownloadManager)context.getSystemService(Context.DOWNLOAD_SERVICE); 
query = new DownloadManager.Query(); 
if(query!=null) { 
    return true; 
    } else { 
    return false; 
}

'光标C = downloadManager.query（new DownloadManager.Query（）。setFilterById（referenceId））; （c.moveToFirst（））{int status = c.getInt（c.getColumnIndex（DownloadManager.COLUMN_STATUS））;如果（c.moveToFirst if（status == DownloadManager.STATUS_SUCCESSFUL）{' –

我不知道如何获得下载的id，所以我已经使用了标志。请问您是如何看到referenceId的？ – ilan

当您在下载管理器中添加请求时，像这样'referenceId = downloadManager.enqueue（request）;'这是为了您自己添加下载请求的情况。 –

答

的状态如果你想获得一个特定的下载在这种情况下的状态，当你在那个时候downloadManager.enqueue开始下载（）方法返回downloadId这是唯一的每个下载，所以你可以保存这个和使用获得像这样的DownloadStatus

这里开始下载返回你downloadId

public long startDownload(String downloadurl) { 
       DownloadManager downloadManager = 
         (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE); 
       try { 
        DownloadManager.Request request = new DownloadManager.Request(Uri.parse(downloadurl)); 
// enqueue method retuns downloadId 
        return downloadManager.enqueue(request); 
       } catch (Exception e) { 
        Log.d("DOWNLOADED_INFO", "startDownload =" + e.getMessage()); 
        e.printStackTrace(); 
       } 
       return 0; 
      }

这downloadId传递给方法的getStatus

public static int getStatus(Context context , long downloadId) { 
    DownloadManager downloadManager = 
      (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE); 
    DownloadManager.Query query = new DownloadManager.Query(); 
    query.setFilterById(downloadId);// filter your download bu download Id 
    Cursor c = downloadManager.query(query); 
    if (c.moveToFirst()) { 
     int status = c.getInt(c.getColumnIndex(DownloadManager.COLUMN_STATUS)); 
     c.close(); 
     Log.i("DOWNLOAD_STATUS", String.valueOf(status)); 
     return status; 
    } 
    Log.i("AUTOMATION_DOWNLOAD", "DEFAULT"); 
    return -1; 
}

检查，如果当前文件downloadng

public static boolean isDownloading(Context context , long downloadId){ 
     return getStatus(context , downloadId) == com.mozillaonline.providers.DownloadManager.STATUS_RUNNING; 
    }

以上方法可用于检查一个特定的下载状态。如果要检查你的下载管理器的状态，任何文件被下载或暂停状态，你可以通过这种方法

public static boolean checkStatus(Context context , int status) { 
     DownloadManager downloadManager = (DownloadManager) 
       context.getSystemService(Context.DOWNLOAD_SERVICE); 
     DownloadManager.Query query = new DownloadManager.Query(); 

     query.setFilterByStatus(status); 
     Cursor c = downloadManager.query(query); 
     if (c.moveToFirst()) { 
      c.close(); 
      Log.i("DOWNLOAD_STATUS", String.valueOf(status)); 
      return true; 
     } 
     Log.i("AUTOMATION_DOWNLOAD", "DEFAULT"); 
     return false; 
    }

，然后检查只需调用这个方法

checkStatus(context , DownloadManager.STATUS_RUNNING);

我很感谢您在我的帖子上花费的时间。现在我的代码工作得很好。函数startDownload（）和checkStatus（）正是我所需要的。 – ilan

答

可以使用STATUS_RUNNING要访问下载管理器

https://developer.android.com/reference/android/app/DownloadManager.html#STATUS_RUNNING

如何检查下载是否正在运行？ DownloadManager

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