BMI Calc

프로젝트 생성

프로젝트명 : BmiCalc
Activity 유형 : Empty

strings.xml

<resources>
    <string name="app_name">BmiCalc</string>
    <string name="height">신장</string>
    <string name="weight">체중</string>
    <string name="result">결과보기</string>
</resources>

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:id="@+id/heightEditText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="number"
        android:ems="10"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="84dp"
        app:layout_constraintStart_toStartOf="parent"
        android:layout_marginLeft="8dp"
        android:layout_marginStart="8dp"
        app:layout_constraintEnd_toEndOf="parent"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:hint="@string/height"
        android:textAppearance="@style/TextAppearance.AppCompat.Large"/>

    <EditText
        android:id="@+id/weightEditText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="number"
        android:ems="10"
        app:layout_constraintStart_toStartOf="parent"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginEnd="8dp"
        app:layout_constraintEnd_toEndOf="parent"
        android:layout_marginRight="8dp"
        app:layout_constraintTop_toBottomOf="@+id/heightEditText"
        android:layout_marginTop="16dp"
        android:hint="@string/weight"
        android:textAppearance="@style/TextAppearance.AppCompat.Large"/>

    <Button
        android:id="@+id/resultButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/result"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        android:layout_marginTop="8dp"
        app:layout_constraintTop_toBottomOf="@+id/weightEditText"
        android:textAppearance="@style/TextAppearance.AppCompat.Large"/>
</androidx.constraintlayout.widget.ConstraintLayout>

Anko 라이브러리 ☆☆☆

https://github.com/Kotlin/anko

build.gradle(Project)

buildscript {
    ext.kotlin_version = '1.2.51'
    ext.anko_version='0.10.8'

build.gradle(Module: app)

dependencies {
    implementation "org.jetbrains.anko:anko-commons:$anko_version"
    :
}

→ Sync now

toast()/longToast()

Anko Common에서 정의
Context의 메서드로 포함
예
- toast("Hi there!")
- toast(R.string.message)
- longToast("Wow, such duration")

MainActivity.kt

package com.example.bmicalc

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import org.jetbrains.anko.toast
import kotlinx.android.synthetic.main.activity_main.*


class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        resultButton.setOnClickListener {
            val height = heightEditText.text.toString().toInt()
            val weight = weightEditText.text.toString().toInt()
            toast("키 : $height, 체중: $weight")
        }
    }
}

실행 결과

다른 액티비티 호출

ResultActivity 생성

File > New > Activity > Empty Activity
- Activity Name: ResultActivity
- Layout Name: activity_result

Vector Image 지원

api level 21 이상에서 지원, 21 미만인 경우 설정 필요
build.gradle(Module:app)

    :
android {
    compileSdkVersion 29
    buildToolsVersion "29.0.2"
    defaultConfig {
        applicationId "com.example.bmicalc"
        minSdkVersion 15
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        vectorDrawables.useSupportLibrary = true
    :

api level 21 이상 설정할 필요 없다.

이미지 아이콘 생성

res/drawable > New > Vector Asset
- Name : ic_baseline_sentiment_satisfied_alt_24

res/drawable > New > Vector Asset
- Name : ic_baseline_sentiment_dissatisfied_24

res/drawable > New > Vector Asset
- Name : ic_baseline_sentiment_very_dissatisfied_24

activity_result.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=".ResultActivity">

    <TextView
        android:id="@+id/resultTextView"
        android:text="결과가 표시되는 곳"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        android:textAppearance="@style/TextAppearance.AppCompat.Large"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="100dp"/>

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="100dp"
        android:layout_height="100dp"
        app:srcCompat="@drawable/ic_baseline_sentiment_satisfied_alt_24"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/resultTextView"
        android:layout_marginTop="32dp"/>
</androidx.constraintlayout.widget.ConstraintLayout>

Anko 라이브러리

startActivity<SomeOtherActivity>(
    Extra Data, …
)

startActivity<SomeOtherActivity>(
    "key1" to value1,
    "key2" to value2,
      …
)

MainActivity.kt

package com.example.bmicalc

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import org.jetbrains.anko.toast
import kotlinx.android.synthetic.main.activity_main.*
import org.jetbrains.anko.startActivity


class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        resultButton.setOnClickListener {
            val height = heightEditText.text.toString().toInt()
            val weight = weightEditText.text.toString().toInt()

            startActivity<ResultActivity>(
                "height" to height,
                "weight" to weight
            )
        }
    }
}

ResultActivity.kt

package com.example.bmicalc

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import kotlinx.android.synthetic.main.activity_result.*
import org.jetbrains.anko.longToast

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

        val height = intent.getIntExtra("height", 0)
        val weight = intent.getIntExtra("weight", 0)

        val bmi = weight / Math.pow(height / 100.0, 2.0)

        // 결과 표시
        when {
            bmi >= 35 -> resultTextView.text = "고도 비만"
            bmi >= 30 -> resultTextView.text = "2단계 비만"
            bmi >= 25 -> resultTextView.text = "1단계 비만"
            bmi >= 23 -> resultTextView.text = "과체중"
            bmi >= 18.5 -> resultTextView.text = "정상"
            else -> resultTextView.text = "저체중"
        }

        when {
            bmi >= 23 -> imageView.setImageResource(
                R.drawable.ic_baseline_sentiment_very_dissatisfied_24)
            bmi >= 18.5 -> imageView.setImageResource(
                R.drawable.ic_baseline_sentiment_satisfied_alt_24)
            else -> imageView.setImageResource(
                R.drawable.ic_baseline_sentiment_dissatisfied_24)
        }

        longToast("키 : $height, 체중: $weight, bmi: $bmi")
    }
}

실행 결과

속성 추가 - 뒤로가기 버튼 생성

AndroidManifest.xml

    :
<activity android:name=".ResultActivity"
            android:parentActivityName=".MainActivity"></activity>
    :

핸드폰 하단의 back 버튼은 데이터가 남아있으나

이 경우 데이터가 남아있지 않다.

데이터 저장하고 복원하기

데이터 저장하고 복원하기
- SharedPreferences에 저장 및 복원
- 저장 시점
  - ResultActivity를 호출하기 전
  - saveData() 정의
- 복원 시점
  - onCreate()
  - loadData() 정의

MainActivity.kt

package com.example.bmicalc

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.preference.PreferenceManager
import org.jetbrains.anko.toast
import kotlinx.android.synthetic.main.activity_main.*
import org.jetbrains.anko.startActivity


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

        loadData()
        resultButton.setOnClickListener {
            val height = heightEditText.text.toString().toInt()
            val weight = weightEditText.text.toString().toInt()

            saveData(height, weight)

            startActivity<ResultActivity>(
                "height" to height,
                "weight" to weight
            )
        }
    }
    private fun saveData(height: Int, weight: Int) {
        val pref = PreferenceManager.getDefaultSharedPreferences(this)
        val editor = pref.edit()
        editor.putInt("KEY_HEIGHT", height)
            .putInt("KEY_WEIGHT", weight)
            .apply()
    }

    private fun loadData() {
        val pref = PreferenceManager.getDefaultSharedPreferences(this)
        val height = pref.getInt("KEY_HEIGHT", 0)
        val weight = pref.getInt("KEY_WEIGHT", 0)
        if (height != 0 && weight != 0) {
            heightEditText.setText(height.toString())
            weightEditText.setText(weight.toString())
        }
    }
}

뒤로가기를 눌러도 마지막에 사용한 데이터가 저장된다.

저작자표시

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cooluk

AndroidStudio - BMI Calc

BMI Calc

BMI Calc

다른 액티비티 호출

데이터 저장하고 복원하기

'IoT 디바이스 활용 > AndroidStudio' 카테고리의 다른 글

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AndroidStudio - BMI Calc

BMI Calc

BMI Calc

다른 액티비티 호출

데이터 저장하고 복원하기

'IoT 디바이스 활용 > AndroidStudio' 카테고리의 다른 글

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