[코틀린을 활용한 안드로이드 프로그래밍] 7장 직접 풀어보기 7-2

 

[Gradle 설정]

id 'kotlin-android-extensions'

 

<MainActivity>

package com.cookandroid.project7_2
 
import android.graphics.Color
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.ContextMenu
import android.view.MenuItem
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)
        title = "배경색 바꾸기(컨텍스트 메뉴)"
 
        registerForContextMenu(button1)
        registerForContextMenu(button2)
 
    }
 
    override fun onCreateContextMenu(
        menu: ContextMenu?,
        v: View?,
        menuInfo: ContextMenu.ContextMenuInfo?
    ) {
        super.onCreateContextMenu(menu, v, menuInfo)
 
        if(v === button1){
            menu!!.setHeaderTitle("배경석 변경")
            menu!!.add(0, 1, 0, "배경색(빨강)")
            menu!!.add(0, 2, 0, "배경색(초록)")
            menu!!.add(0, 3, 0, "배경색(파랑)")
        }
        if(v === button2){
            menu!!.add(0, 4, 0, "버튼 45도 회전")
            menu!!.add(0, 5, 0, "버튼 2개 확대")
        }
    }
 
    override fun onContextItemSelected(item: MenuItem): Boolean {
        when(item.itemId){
            1 -> {
                baseLayout.setBackgroundColor(Color.RED)
            }
 
            2 -> {
                baseLayout.setBackgroundColor(Color.GREEN)
            }
 
            3 -> {
                baseLayout.setBackgroundColor(Color.BLUE)
            }
            4 ->{
                button2.rotation += 45f
            }
            5 ->{
                button2.scaleX += 2f
                button2.scaleY += 2f
            }
        }
        return super.onContextItemSelected(item)
    }
 
 
}

 

<activity_main.xml>

ㅌ<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/baseLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center_horizontal">
 
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="배경색 변경"/>
    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="버튼 변경"/>
 
</LinearLayout>