혀가 길지 않은 개발자

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.ProgressBar; public class MainActivity extends AppCompatActivity { Button btnVisible; Button btnGone; ProgressBar pbLoading; @Override protected void onCreate(Bundle savedInstan..

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