[코틀린을 활용한 안드로이드 프로그래밍] 10장 연습문제 5번

[Gradle 설정]

1

id 'kotlin-android-extensions'

cs

<MainActivity>

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.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        title = "연습문제 10-5"
        btnNewActivity.setOnClickListener {
            startActivity(Intent(applicationContext, Second::class.java))
        }
    }
 
}

<Second>

package com.cookandroid.myapplication
 
import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import kotlinx.android.synthetic.main.activity_main.*
import kotlinx.android.synthetic.main.activity_second.*
 
class Second : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_second)
        title = "Second 액티비티"
        btnReturn.setOnClickListener {
            finish()
        }
        btnNewThirdActivity.setOnClickListener {
            startActivity(Intent(applicationContext, Third::class.java))
 
        }
    }
}

<Third>

package com.cookandroid.myapplication
 
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import kotlinx.android.synthetic.main.activity_second.*
 
class Third : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_third)
        title = "Third 액티비티"
        btnReturn.setOnClickListener {
            finish()
        }
    }
}

<activity_main.xml>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    <Button
        android:id="@+id/btnNewActivity"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="새 화면 열기"/>
 
 
</LinearLayout>

<activity_second.xml>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="#00FF00">
 
    <Button
        android:id="@+id/btnNewThirdActivity"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10dp"
        android:text="새 화면 열기"
        android:background="#00F000"/>
 
    <Button
        android:id="@+id/btnReturn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="돌아가기"
        android:background="#00F000"/>
 
</LinearLayout>

<activity_third.xml>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#0000FF">
 
    <Button
        android:id="@+id/btnReturn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="돌아가기"
        android:background="#0000F0"/>
 
</LinearLayout>