最近看到android第一行代码第三版746页，按照书上的代码实现没有输入，也没报错，请大师指点谢谢 override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) val binding = ActivityHttpURLConnectionBinding.inflate(layoutInflater) setContentView(binding.root) binding.btnShow.setOnClickListener { Log.i(TAG,"click btn============") val response=HttpUtil.sendOkHttpRequest(strURL2,object:Callback{ <span style="color: #FF0000;"> //此方法调用没有输出也无报错信息</span> override fun onFailure(call: Call, e: IOException) { Log.i(TAG,"11111111111111111111111") e.printStackTrace() Log.i(TAG,"sendOkHttpRequest Callback err:${e.toString()}") } override fun onResponse(call: Call, response: Response) { Log.i(TAG,"22222222222222222222") val responseData=response.body?.string() //get value showResponse(responseData) } })// sendRequestWithOKHttp() //单独的okhttp请求方法 } }/** * 网络操作公共类 */object HttpUtil { private val TAG="HttpUtil_wp" private val PORT=8000// OKhttp请求方法，比普通http请求方法简单 fun sendOkHttpRequest(address: String,callback:okhttp3.Callback){ val client=OkHttpClient() val request=Request.Builder().url(address).build() client.newCall(request).equals(callback) //内部已经开好子线程，在子线程中执行HTTP请求，结果返回callback }