Android Kotlin Intent putExtra, getExtra - 값 전달, 값 받기

 

 

 

 

 

 

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1. 결 과

 

 

 

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2. Layout

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2-1. activity_main.xml

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

    <Button
        android:id="@+id/btnOpenLayout"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Data 전달"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

 

2-2. activity_main2.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity2">

    <TextView
        android:id="@+id/txtGetData"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Test Text"
        android:textSize="22sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

 

 

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3. MainActivity.kt

package com.example.intentputdata

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)

        btnOpenLayout.setOnClickListener {
            val intent = Intent(applicationContext, MainActivity2::class.java)
            intent.putExtra("name", "Lee")
            intent.putExtra("age", 32)
            startActivity(intent)
        }
    }
}

 

# Intent를 생성 한 후 putExtra를 사용하여 넘길 값을 넣는다.

 

 

 

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4. MainActivity2.kt

package com.example.intentputdata

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import kotlinx.android.synthetic.main.activity_main2.*

class MainActivity2 : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main2)

        val name = intent.getStringExtra("name")
        val age = intent.getIntExtra("age", 0)

        txtGetData.text = "Name: $name\nAge: $age"
    }
}

 

# intent에 있는 getStringExtra를 사용하여 MainActivity.kt에서 넘긴 String형 name을 받는다.

 

 

# intent에 있는 getIntExtra를 사용하여 Int형 값을 받는다. 2번 째 파라미터로는 Default 값을 준다.

 

 

 

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5. 전체 코드

GitHub - Notepad96/BlogExample