这猴家的软件开发商是不是脑子进水了，居然不让东西存机身内存

如果是调用的是猴本身DownloadManager的几个api，貌似就是保存在外部存储里的...

DownloadManager.Request setDestinationInExternalFilesDir
DownloadManager.Request setDestinationInExternalPublicDir
DownloadManager.Request setDestinationUri (Uri uri)

Set the local destination for the downloaded file. Must be a file URI to a path on external storage