[Android] kotlin 버튼클릭 이벤트 처리(Button onclick event)

android studio logo

kotlin 버튼클릭 이벤트 처리(Button onclick event)

안드로이드 간단한 버튼 클릭 이벤(setonclick event)트를 만들어봅시다.

 

MainActivity

package com.fflask

import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import android.widget.TextView

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        
		//레이아웃 선언
        val counter_num = findViewById<TextView>(R.id.counter_num)
        val btn_event = findViewById<Button>(R.id.e_btn)
        var counter = 0

        btn_event.setOnClickListener {
            counter++//클릭할때마다 카운터 상승
            counter_num.text = counter.toString()
            //카운터를 텍스트뷰로
        }

    }
}

activity_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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"
        android:background="@drawable/main_background_colors"
        tools:context=".MainActivity">

    <TextView
            android:id="@+id/counter_num"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/start_main_text"
            android:textSize="80sp"
            android:textColor="@android:color/background_light"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent"/>
    <Button
            android:text="@string/reset_btn_text"
            android:textColor="@android:color/background_light"
            android:layout_width="wrap_content"
            android:textStyle="bold"
            android:layout_height="wrap_content"
            android:id="@+id/e_btn"
            android:background="#00000000"
            android:layout_marginTop="8dp"
            app:layout_constraintTop_toTopOf="parent"
            android:layout_marginBottom="8dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintVertical_bias="0.988"
            android:layout_marginEnd="8dp"
            app:layout_constraintEnd_toEndOf="parent"
            android:layout_marginRight="8dp"
            android:layout_marginStart="8dp"
            app:layout_constraintStart_toStartOf="parent"
            android:layout_marginLeft="8dp"
            app:layout_constraintHorizontal_bias="0.498"/>

</android.support.constraint.ConstraintLayout>

xml은 바로 사용하시면 에러가 있을 꺼에요 필요없으신 부분은 삭제하고 사용해주세요.

Main구문의 주석을 참조해주세요.

 

다양한 인벤트를 다음에 다양한 이벤트를 추가해봐야 겠어요.

App playing vedio link: https://www.youtube.com/watch?v=xI_7s9oV3MA