使用OkHttp3获取JSON时遇Unresolved Reference: url错误求助

你的代码核心问题是创建Request.Builder时缺少实例化括号：Request.Builder是类，必须先通过()创建实例，才能调用它的url()实例方法。原写法错误将其当作静态方法调用，导致编译器找不到对应方法，进而触发“url未解析”的报错。

修改后的完整代码：

private fun fetchJson() {
    println("Attempting to fetch JSON")

    val url = "https://lordvarun.github.io/back/data.json"

    // 补全()创建Builder实例
    val request = Request.Builder().url(url).build()

    val client = OkHttpClient()
    client.newCall(request).enqueue(object: Callback {
        override fun onResponse(call: Call, response: Response) {
            val body = response.body?.string()
            println(body)

            val gson = GsonBuilder().create()

            // Kotlin可自动推导泛型，无需额外写<>
            val homeFeed = gson.fromJson(body, HomeFeed::class.java)
        }

        override fun onFailure(call: Call, e: IOException) {
            println("Failed to execute request")
        }
    })
}

额外补充两个注意点：

• Gson的fromJson方法无需手动指定尖括号<>，Kotlin会自动推导泛型类型
• 确保已正确导入相关类：

  import okhttp3.Call
  import okhttp3.Callback
  import okhttp3.OkHttpClient
  import okhttp3.Request
  import okhttp3.Response
  import com.google.gson.GsonBuilder
  import java.io.IOException
  

内容的提问来源于stack exchange，提问作者Vishruthaa B