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HttpURLConnection需要通过新建Thread以执行网络请求
        
    
    
   
    
   
    
        fun downloadUsingUrl(url: String?) {            Thread(Runnable {                try {                    val connection = URL(url).openConnection() as HttpURLConnection                    connection.requestMethod = "GET"                    connection.connectTimeout = 8000                    connection.readTimeout = 8000                    val avatarFile = File("$filesDir/avatar.png")                    if (avatarFile.exists()) {                        avatarFile.delete()                    } else if (!filesDir.exists()) {                        filesDir.mkdir()                    }                    filesDir.setReadable(true)                    filesDir.setWritable(true)                    connection.inputStream.buffered().copyTo(avatarFile.outputStream())                } catch (ex: Exception) {                    ex.printStackTrace()                }            }).start()        }    
    
   
   

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