Membuat Aplikasi Kalkulator dengan Kotlin Android Studio

Sumber : https://blog.sekolahmobile.com/membuat-aplikasi-kalkulator-di-android-dengan-kotlin/ 

1. Tambahkan pada gradle

implementation 'net.objecthunter:exp4j:0.4.8'

2. Buat file dimens.xml di values

<?xml version="1.0" encoding="utf-8"?>

<resources>

    <dimen name="text_result_calculator">56sp</dimen>

    <dimen name="activity_padding">24dp</dimen>

    <dimen name="button_calculator">78dp</dimen>

    <dimen name="button_margin">16dp</dimen>

    <dimen name="radius_button">16dp</dimen>

    <dimen name="textSize_button">24sp</dimen>

</resources>

3. Menambah warna pada colors.xml

<?xml version="1.0" encoding="utf-8"?>

<resources>

    <color name="purple_200">#FFBB86FC</color>

    <color name="purple_500">#FF6200EE</color>

    <color name="purple_700">#FF3700B3</color>

    <color name="teal_200">#FF03DAC5</color>

    <color name="teal_700">#FF018786</color>

    <color name="black">#FF000000</color>

    <color name="white">#FFFFFFFF</color>

    <color name="colorPrimary">#6200EE</color>

    <color name="colorPrimaryDark">#3700B3</color>

    <color name="colorAccent">#03DAC5</color>

    <color name="colorRipple">#ACACAC</color>

    <color name="colorGray">#DEDEDE</color>

    <color name="colorYellow">#f2ae27</color>

    <color name="colorGreen">#21c353</color>

</resources>

3. Buat 3 ripple

<?xml version="1.0" encoding="utf-8"?>

<ripple xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:andrid="http://schemas.android.com/aapt"

    xmlns:tools="http://schemas.android.com/tools"

    android:color="@color/colorRipple"

    tools:ignore="NewsApi">>

    <item>

        <shape android:shape="rectangle">

            <solid andrid:color="@color/colorGreen"/>

            <corners android:radius="16dp"/>

        </shape>

    </item>

    <item android:id="@android:id/mask">

        <shape android:shape="rectangle">

            <solid android:color="@color/colorRipple"/>

            <corners android:radius="16dp"/>

        </shape>

    </item>

</ripple>