모바일프로그래밍 - Android 앱 개발 기초 / mile을 km로 변환하는 앱

언어 : kotlin 사용

Android studio 사용

 

 

MainActivity.kt

package com.example.gradetest

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.widget.*
import com.example.gradetest.databinding.ActivityMainBinding
import android.view.View

class MainActivity : AppCompatActivity(), AdapterView.OnItemSelectedListener {

    lateinit var binding : ActivityMainBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)

        binding.btnConvert.setOnClickListener{

            var input = binding.txtInput.text.toString().toDouble()
            val res = input * 1.6

            binding.txtResult.text = res.toString()

        }


    }

    override fun onItemSelected(p0: AdapterView<*>?, p1: View?, p2: Int, p3: Long) {


    }

    override fun onNothingSelected(p0: AdapterView<*>?) {

    }
}

 

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">

    <Button
        android:id="@+id/btnConvert"
        android:layout_width="180dp"
        android:layout_height="72dp"
        android:layout_marginTop="132dp"
        android:text="Convert"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/txtInput" />

    <TextView
        android:id="@+id/txtResult"
        android:layout_width="117dp"
        android:layout_height="82dp"
        android:layout_marginStart="56dp"
        android:textSize="34sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/btnConvert"
        app:layout_constraintVertical_bias="0.45" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="100dp"
        android:layout_height="58dp"
        android:layout_marginTop="196dp"
        android:layout_marginEnd="16dp"
        android:text="mile"
        android:textSize="40sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView3"
        android:layout_width="159dp"
        android:layout_height="56dp"
        android:layout_marginBottom="112dp"
        android:text="km입니다."
        android:textSize="34sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.303"
        app:layout_constraintStart_toEndOf="@+id/txtResult" />

    <EditText
        android:id="@+id/txtInput"
        android:layout_width="220dp"
        android:layout_height="60dp"
        android:layout_marginTop="196dp"
        android:ems="10"
        android:gravity="right"
        android:inputType="textPersonName"
        android:textSize="40sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.193"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>