DownloadManager.ACTION_DOWNLOAD_COMPLETE广播接收器在Android中使用不同的下载状态多次接收相同的下载ID [英] DownloadManager.ACTION_DOWNLOAD_COMPLETE broadcast receiver receiving same download id more than once with different download statuses in Android

问题描述

我正在使用Android DownloadManger系统服务以下列方式下载某些文件：

I am using Android DownloadManger System Service for downloading some files in following way

dwnId = mgr.enqueue(new DownloadManager.Request(serveruri)
        .setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI |
                DownloadManager.Request.NETWORK_MOBILE)
                .setAllowedOverRoaming(false)
                .setTitle(getAlbumName())
                .setDescription(getTrackName())
                .setDestinationUri(deviceUri)
                .setShowRunningNotification(true));

其中 mgr 是下载管理器实例， code> dwnId 是返回的唯一ID。我也在注册 ACTION_DOWNLOAD_COMPLETE

where mgr is Download Manager instance, dwnId is unique ID returned. I am also registering for ACTION_DOWNLOAD_COMPLETE

registerReceiver(onDownloadComplete, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));

在onDownloadComplete BroadcastReceiver的onReceive（）方法中，我正在下载Id，如

and in the onDownloadComplete BroadcastReceiver's onReceive() method I am getting download Id like

Long dwnId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, 0);

之后，我查询下载管理器的下载状态

After that I am querying Download Manager for Download status

Cursor c = downloadManager.query(new DownloadManager.Query().setFilterById(dwnId)); c.getInt(c.getColumnIndex(DownloadManager.COLUMN_STATUS));

为DownloadManager.STATUS_ *常数。

for DownloadManager.STATUS_* constants.

问题是我正在收到相同的downId两次（意味着onReceive方法被调用两次），一次与DownloadManager.STATUS_SUCCESSFUL状态，一次与DownloadManager.STATUS_FAILED状态相同的dwnId 。我正在发出请求，一次下载一些10个文件，但在设备下载管理器上，它显示的下载次数是通知栏左上角的1​​2或13。我认为下载管理器在下载文件时有一些问题，并恢复或自动重新启动以再次下载同一个文件。这就是为什么我要求下载的文件数量与下载队列中的实际号码有所不同。因为这个只有我得到相同的DownloadId完成动作两次。如果这是真的，如何限制它。我错了什么可能是我要求实际下载之间计数差异的原因？为什么广播接收器接收到相同的下载ID两次。有人可以让我知道吗？

The problem is I am receiving the same downId twice (means onReceive method is called twice), once with DownloadManager.STATUS_SUCCESSFUL status and once with DownloadManager.STATUS_FAILED status for same dwnId. I am issuing request to download some 10 files at a time and but on device download manager it is showing the download count as some 12 or 13 in the notification bar top left means. I think that Download manager has some problem in downloading files and resumed or automatically restarted to download the same file again. Thats why there is a difference between the files count I requested to download and actual number in download queue. Because of this only I am getting same DownloadId complete action twice. If this is true, how to restrict it. Am I wrong what might be the reason for count difference between what I requested to actual download? Why is the broadcast receiver receiving the same download Id twice. Can anybody please let me know?

感谢提前...

推荐答案

这是一个报告的错误，请参阅： http://code.google .com / p / android / issues / detail？id = 18462

This is a reported bug see: http://code.google.com/p/android/issues/detail?id=18462

我发现的方法是验证下载是否成功，如果不是如果这个文件没有被下载，那么可能会丢失这个意图或重新排队文件。

The way around I found is to verify if the download was a success, if not ditch the intent or re-queue the file if it was never downloaded...

丢掉几个小时，看看那个：（

Lost a couple of hours figuring that one :(

**编辑：添加代码示例**

** adding code example **

/**
 * Check if download was valid, see issue
 * http://code.google.com/p/android/issues/detail?id=18462
 * @param long1
 * @return
 */
private boolean validDownload(long downloadId) {

    Log.d(TAG,"Checking download status for id: " + downloadId);

    //Verify if download is a success
    Cursor c= dMgr.query(new DownloadManager.Query().setFilterById(downloadId));

    if(c.moveToFirst()){            
        int status = c.getInt(c.getColumnIndex(DownloadManager.COLUMN_STATUS));

        if(status == DownloadManager.STATUS_SUCCESSFUL){
            return true; //Download is valid, celebrate
        }else{
            int reason = c.getInt(c.getColumnIndex(DownloadManager.COLUMN_REASON));
            Log.d(TAG, "Download not correct, status [" + status + "] reason [" + reason + "]");            
            return false;
        }   
    }               
    return false;                                   
}

有关完整的代码，请参阅： https://github.com/flegare/JAV387_LaboWidget/blob/master/src/com/ mobidroid / widget / service / FactService.java

For complete code see : https://github.com/flegare/JAV387_LaboWidget/blob/master/src/com/mobidroid/widgetfact/service/FactService.java

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