혀가 길지 않은 개발자

lateinit vs Delegates.notNull() MainActivity.kt package com.jwsoft.kotlinproject import androidx.appcompat.app.AppCompatActivity import android.os.Bundle class MainActivity : AppCompatActivity() { private lateinit var longValue: Long private lateinit var intValue: Int private lateinit var stringValue: String private lateinit var arrLong: ArrayList private lateinit var arrInt: ArrayList private l..

cardview_item.xml MyAdapter.kt package com.jwsoft.kotlinproject import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import android.widget.TextView import androidx.recyclerview.widget.RecyclerView class MyAdapter : RecyclerView.Adapter() { inner class MyViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) { private val tvPosition: TextView = itemVie..

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) etJames.requestFocus() // 포커스가 있어야 키보드 노출. } } activ..

activity_main.xml MainActivity.java package com.jwsoft.javaproject; import androidx.appcompat.app.AppCompatActivity; import android.content.Context; import android.os.Bundle; import android.view.View; import android.view.inputmethod.InputMethodManager; import android.widget.Button; import android.widget.EditText; public class MainActivity extends AppCompatActivity { private Button btnShowKeyboar..

activity_main.xml MainActivity.kt package com.jwsoft.kotlinproject import android.content.Context import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.view.inputmethod.InputMethodManager import kotlinx.android.synthetic.main.activity_main.* class MainActivity : AppCompatActivity() { private lateinit var inputMethodManager: InputMethodManager override fun onCrea..