혀가 길지 않은 개발자

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 인터넷 권한 추가. RetrofitAPI.java package com.jwsoft.javaproject; import com.google.gson.JsonObject; import java.util.List; import retrofit2.Call; ..

activity_main.xml MainActivity.java package com.jwsoft.javaproject; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView; public class MainActivity extends AppCompatActivity { TextView tvText; Button btnChange; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(..

UI 작업은 Main Thread에서 해야 하는데 만약 Worker Thread에서 UI 변경을 해야 한다면 Handler를 이용하여 Main Thread와 연결해 주어야 한다. 단, Handler는 Main Thread에서 생성이 되어야 한다. activity_main.xml MainActivity.java package com.jwsoft.javaproject; import androidx.annotation.NonNull; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.View; i..

build.gradle (Module: app) dependencies { // 리사이클러뷰 추가 implementation 'androidx.recyclerview:recyclerview:1.1.0' } activity_main.xml recyclerview_item.xml RecyclerViewAdapter.java package com.jwsoft.javaproject; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import androidx.annotation.No..

activity_main.xml MainActivity.kt package com.jwsoft.kotlinproject import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import kotlinx.android.synthetic.main.activity_main.* class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) btnChange.setOnClickListener { Thr..