android 掉接口404,Android DownloadManager总是返回404

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