[Gradle 설정] 1 id 'kotlin-android-extensions' cs 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 package com.cookandroid.myapplication import android.content.Intent 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.onCre..

[Gradle 설정] 1 id 'kotlin-android-extensions' cs 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 package com.cookandroid.myapplication import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.widget.Toast import kotlinx.android.synthetic.main.activity_main...

[TIP] RadioGroup 메소드중에 clearCheck()을 호출하면 RadioGroup 안에 모든 Button의 체크 상태가 해제됨 [Gradle 설정] 1 id 'kotlin-android-extensions' cs 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 package com.cookandroid.myapplication import androidx.appcompat.app.AppCompatActivity imp..

[Gradle 설정] 1 id 'kotlin-android-extensions' cs 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 package com.cookandroid.project7_2 import android.graphics.Color import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.view.Con..

[TIP] 1. 이미지뷰의 이미지를 변경하려면 setImageResource() 메소드를 사용 2. 메뉴 XML에서 여러 항목을 묶으려면 ...을 사용한다 [Gradle 설정] 1 id 'kotlin-android-extensions' cs 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 package com.cookandroid.project7_1 import android.graphics.Color import androidx.appcompat.app.AppCompatActivity import android.os.Bundle..