kotlin 코틀린 클래스에서 Parcelable 상속 하기 / Parcelable 기능으로 첫번째 화면에서 받은 데이터 두번째 화면으로 전달하는 안드로이드 화면 만들기

폴더 및 파일 구성

1. 새로 만들기  > Activity > EmptyActivity 이용해서 SecondActivity 만들기 

2. Student라는 클래스 만들기

 

---

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MainActivity">
    <EditText
            android:layout_width="518dp"
            android:layout_height="78dp"
            android:inputType="textPersonName"
            android:ems="10"
            android:id="@+id/editName"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintVertical_bias="0.174"/>
    <EditText
            android:layout_width="518dp"
            android:layout_height="78dp"
            android:inputType="textPersonName"
            android:ems="10"
            android:id="@+id/editCount"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintVertical_bias="0.295"/>
    <EditText
            android:layout_width="518dp"
            android:layout_height="78dp"
            android:inputType="textPersonName"
            android:ems="10"
            android:id="@+id/editLevel"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintVertical_bias="0.41"/>
    <Button
            android:text="이동"
            android:layout_width="504dp"
            android:layout_height="109dp"
            android:id="@+id/move"
            app:layout_constraintTop_toBottomOf="@+id/editLevel"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintVertical_bias="0.153"/>
</androidx.constraintlayout.widget.ConstraintLayout>

designe 화면

 

activity_second.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".SecondActivity">

    <TextView
            android:text="TextView"
            android:layout_width="443dp"
            android:layout_height="238dp"
            android:id="@+id/textView"
            app:layout_constraintTop_toTopOf="parent"
            android:textSize="30dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintHorizontal_bias="0.502"
            app:layout_constraintVertical_bias="0.251"/>
    <Button
            android:text="읽기"
            android:layout_width="270dp"
            android:layout_height="137dp"
            android:id="@+id/read"
            app:layout_constraintTop_toBottomOf="@+id/textView"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintVertical_bias="0.151"/>
</androidx.constraintlayout.widget.ConstraintLayout>

 

designe화면

---

Student.kt

package com.example.sample34

import android.os.Parcel
import android.os.Parcelable

class Student(var name:String?,var count:Int, var level:String?) : Parcelable{

    constructor(parcel: Parcel):this(parcel.readString(),parcel.readInt(),parcel.readString()){

    }

    override fun writeToParcel(parcel: Parcel?, p1: Int) {
        parcel?.writeString(name)
        parcel?.writeInt(count)
        parcel?.writeString(level)
    }

    override fun describeContents(): Int {
        return 0
    }

    companion object CREATOR : Parcelable.Creator<Student> {
        override fun createFromParcel(parcel: Parcel): Student {
            return Student(parcel)
        }

        override fun newArray(size: Int): Array<Student?> {
            return arrayOfNulls(size)
        }
    }


}

 

 

MainActiviky.kt

package com.example.sample34

import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import android.widget.EditText

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val editName = findViewById<EditText>(R.id.editName)
        val editCount = findViewById<EditText>(R.id.editCount)
        val editLevel = findViewById<EditText>(R.id.editLevel)

        val  move = findViewById<Button>(R.id.move)

        move.setOnClickListener {
            var student = Student(editName.text.toString(),editCount.text.toString().toInt(),editLevel.text.toString())

            //이동 준비
            val nextIntent = Intent(this,SecondActivity::class.java)

            //꾸러미 챙기기
            nextIntent.putExtra("Student",student)

            //꾸러미 보내기
            startActivity(nextIntent)

        }

    }
}

 

 

SecondActivity.kt

package com.example.sample34

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import android.widget.TextView

class SecondActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_second)

        val textView = findViewById<TextView>(R.id.textView)
        val read = findViewById<Button>(R.id.read)
        read.setOnClickListener {

           //꾸러미 풀기
            var student = intent.getParcelableExtra<Student>("Student")
            if(student!=null){
                textView.text = "${student.name} ${student.count} ${student.level}"
            }
        }

    }
}

 

실행화면

 

 

첫번째 화면에 데이터 입력

 

 

 

두번째 화면에 출력