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HttpURLConnection需要新建Thread以运行

fun downloadUsingUrl(Url:String?) {       Thread(Runnable {           try {               val connection = URL(Url).openConnection() as HttpURLConnection            connection.requestMethod = "GET"            connection.connectTimeout = 8000            connection.readTimeout = 8000            val avatar = File("$filesDir/avatar.png")            if(avatar.exists()) avatar.delete()            else if(!filesDir.exists()) filesDir.mkdir()            filesDir.setReadable(true)            filesDir.setWritable(true)            connection.inputStream.buffered().copyTo(avatar.outputStream())        }catch (ex: Exception) {               ex.printStackTrace()         }    }).start()}

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