Question

尝试使用android的DownloadManager服务，但始终收到404作为原因。这是排队请求的代码：

val downloadManager = applicationContext.getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager
                val request = DownloadManager.Request(uri)

                request.setAllowedOverRoaming(true)
                request.setAllowedOverMetered(true)
                request.setVisibleInDownloadsUi(false)
                request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI or DownloadManager.Request.NETWORK_MOBILE)
                request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE);

                //TODO : do we need to wait here ??
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                    ActivityCompat.requestPermissions(baseSessionActivity, arrayOf(android.Manifest.permission.WRITE_EXTERNAL_STORAGE), 0);
                }


                request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS , File(absoluteURL).name)

                headers?.forEach { pair ->
                    request.addRequestHeader(pair.first, pair.second)
                }

                return downloadManager.enqueue(request)

然后这是我收到ACTION_DOWNLOAD_COMPLETE意向后读取状态的代码：

    val query = DownloadManager.Query() 
query.setFilterById(downloadId) 
val downloadManager = context.getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager 
val cursor = downloadManager.query(query) 

cursor?.let { 
if (cursor.moveToFirst()) { 
var reasonIndex = cursor.getColumnIndex(DownloadManager.COLUMN_REASON) 
var reason = cursor.getInt(reasonIndex) 
var status = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS))

我在磁盘上看不到文件，因此404正确。如果我的代码有任何错误，请告诉我。谢谢

Android DownloadManager总是返回404

0 个答案: