[Kotlin] Retrofit2

build.gradle (Module: app)

dependencies {
    // Retrofit2
    implementation 'com.squareup.retrofit2:retrofit:2.7.1'
    implementation 'com.squareup.retrofit2:converter-gson:2.7.1'
    implementation 'com.squareup.okhttp3:logging-interceptor:4.3.1'
}

 

 

 

 

 

 

 

AndroidManifast.xml

<uses-permission android:name="android.permission.INTERNET"/>

인터넷 권한 추가.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.jwsoft.kotlinproject">

    <uses-permission android:name="android.permission.INTERNET"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

 

 

 

 

 

 

RetrofitAPI.kt

package com.jwsoft.kotlinproject

import com.google.gson.JsonObject
import retrofit2.Call
import retrofit2.http.GET
import retrofit2.http.Path

interface RetrofitAPI {
    @GET("/users/{user}/repos")
    fun getUserRepos(@Path("user") userName: String): Call<List<JsonObject>>
}

 

 

 

 

 

MainActivity.kt

package com.jwsoft.kotlinproject

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.os.Handler
import android.util.Log
import com.google.gson.JsonObject
import okhttp3.OkHttpClient
import okhttp3.logging.HttpLoggingInterceptor
import retrofit2.Call
import retrofit2.Callback
import retrofit2.Response
import retrofit2.Retrofit
import retrofit2.converter.gson.GsonConverterFactory

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        var interceptor = HttpLoggingInterceptor(object: HttpLoggingInterceptor.Logger {
            override fun log(message: String) {
                Log.e("", message)
            }
        })

        interceptor.level = HttpLoggingInterceptor.Level.BODY

        var client = OkHttpClient.Builder()
            .connectTimeout(5, TimeUnit.SECONDS)
            .readTimeout(5, TimeUnit.SECONDS)
            .writeTimeout(5, TimeUnit.SECONDS)
            .addInterceptor(interceptor)
            .build()

        var retrofit: Retrofit = Retrofit.Builder()
            .baseUrl("https://api.github.com")
            .client(client)
            .addConverterFactory(GsonConverterFactory.create())
            .build()

        var retrofitAPI = retrofit.create(RetrofitAPI::class.java)
        retrofitAPI.getUserRepos("jwsoft91").enqueue(object: Callback<List<JsonObject>> {
            override fun onFailure(call: Call<List<JsonObject>>, t: Throwable) {
                Log.e("", "fail !!!")
            }

            override fun onResponse(
                call: Call<List<JsonObject>>,
                response: Response<List<JsonObject>>
            ) {
                var jsonArray = response.body()
                var jsonObject = jsonArray?.get(0)
                Log.e("", jsonObject?.get("name").toString())
            }
        })

    }

}

 

에러 발생

 

 

 

 

 

 

build.gradle (Module: app)

android {
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

위에 코드 추가하면 에러 해결됨.

 

stackoverflow.com/questions/59448845/no-static-method-metafactory

No static method metafactory

 

 

 

 

 

 

 

 

실행 후

???

위 에러 발생 시 앱 삭제 후 다시 실행하면 됨.

 

stackoverflow.com/questions/56266801/java-net-socketexception-socket-failed-eperm-operation-not-permitted

java.net.SocketException: socket failed: EPERM (Operation not permitted)

 

 

 

 

 

 

 

 

최종 실행 결과

실행 결과