BMI calculator

BMI-Calculator-Flutter/README.md

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+![App Brewery Banner](https://github.com/londonappbrewery/Images/blob/master/AppBreweryBanner.png)
+
+
+# BMI Calculator 💪
+
+## Our Goal
+
+The objective of this tutorial is to look at how we can customise Flutter Widgets to achieve our own beautiful user interface designs. If you have a designer on board, no matter how unconventional their designs are, we can create them using Flutter. 
+
+
+## What you will create
+
+We’re going to make a Body Mass Index Calculator inspired by the beautiful designs made by [Ruben Vaalt](https://dribbble.com/shots/4585382-Simple-BMI-Calculator). It will be a multi screen app with simple functionality but full-on custom styling. 
+
+![Finished App](https://github.com/londonappbrewery/Images/blob/master/bmi-calc-demo.gif)
+
+## What you will learn
+
+- How to use Flutter themes to create coherent branding. 
+- How to create multi-page apps using Flutter Routes and Navigator.
+- How to extract and refactor Flutter Widgets with a click of the button. 
+- How to pass functions as parameters and fields.
+- How to use the GestureDetector Widget to detect more than just a tap.
+- How to use custom colour palettes by using hex codes.
+- How to customise Flutter Widgets to achieve a specific design style.
+- Understand Dart Enums and the Ternary Operator.
+- Learn about composition vs. inheritance and the Flutter way of creating custom UI.
+- Understand the difference between const and final in Dart and when to use each.
+
+>This is a companion project to The App Brewery's Complete Flutter Development Bootcamp, check out the full course at [www.appbrewery.co](https://www.appbrewery.co/)
+
+![End Banner](https://github.com/londonappbrewery/Images/blob/master/readme-end-banner.png)

BMI-Calculator-Flutter/android/app/build.gradle

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+def localProperties = new Properties()
+def localPropertiesFile = rootProject.file('local.properties')
+if (localPropertiesFile.exists()) {
+    localPropertiesFile.withReader('UTF-8') { reader ->
+        localProperties.load(reader)
+    }
+}
+
+def flutterRoot = localProperties.getProperty('flutter.sdk')
+if (flutterRoot == null) {
+    throw new FileNotFoundException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
+}
+
+def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
+if (flutterVersionCode == null) {
+    flutterVersionCode = '1'
+}
+
+def flutterVersionName = localProperties.getProperty('flutter.versionName')
+if (flutterVersionName == null) {
+    flutterVersionName = '1.0'
+}
+
+apply plugin: 'com.android.application'
+apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
+
+android {
+    compileSdkVersion 29
+
+    lintOptions {
+        disable 'InvalidPackage'
+    }
+
+    defaultConfig {
+        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
+        applicationId "co.appbrewery.bmicalculator"
+        minSdkVersion 16
+        targetSdkVersion 29
+        versionCode flutterVersionCode.toInteger()
+        versionName flutterVersionName
+    }
+
+    buildTypes {
+        release {
+            // TODO: Add your own signing config for the release build.
+            // Signing with the debug keys for now, so `flutter run --release` works.
+            signingConfig signingConfigs.debug
+        }
+    }
+}
+
+flutter {
+    source '../..'
+}
+
+dependencies {
+
+}

BMI-Calculator-Flutter/android/app/src/main/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="co.appbrewery.bmicalculator">
+
+    <!-- The INTERNET permission is required for development. Specifically,
+         flutter needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+
+    <!-- io.flutter.app.FlutterApplication is an android.app.Application that
+         calls FlutterMain.startInitialization(this); in its onCreate method.
+         In most cases you can leave this as-is, but you if you want to provide
+         additional functionality it is fine to subclass or reimplement
+         FlutterApplication and put your custom class here. -->
+    <application
+        android:name="io.flutter.app.FlutterApplication"
+        android:label="bmi_calculator"
+        android:icon="@mipmap/ic_launcher">
+        <activity
+            android:name=".MainActivity"
+            android:launchMode="singleTop"
+            android:theme="@style/LaunchTheme"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize">
+            <!-- This keeps the window background of the activity showing
+                 until Flutter renders its first frame. It can be removed if
+                 there is no splash screen (such as the default splash screen
+                 defined in @style/LaunchTheme). -->
+            <meta-data
+                android:name="io.flutter.app.android.SplashScreenUntilFirstFrame"
+                android:value="true" />
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>

BMI-Calculator-Flutter/android/app/src/main/java/co/appbrewery/bmicalculator/MainActivity.java

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+package co.appbrewery.bmicalculator;
+
+import android.os.Bundle;
+import io.flutter.app.FlutterActivity;
+import io.flutter.plugins.GeneratedPluginRegistrant;
+
+public class MainActivity extends FlutterActivity {
+  @Override
+  protected void onCreate(Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+    GeneratedPluginRegistrant.registerWith(this);
+  }
+}

BMI-Calculator-Flutter/android/app/src/main/res/drawable/launch_background.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@android:color/white" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

BMI-Calculator-Flutter/android/app/src/main/res/values/styles.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             Flutter draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+</resources>

BMI-Calculator-Flutter/android/build.gradle

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+buildscript {
+    repositories {
+        google()
+        jcenter()
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:3.5.3'
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+    }
+}
+
+rootProject.buildDir = '../build'
+subprojects {
+    project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
+    project.evaluationDependsOn(':app')
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}

BMI-Calculator-Flutter/android/gradle.properties

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+org.gradle.jvmargs=-Xmx1536M
+android.useAndroidX=true
+android.enableJetifier=true
+android.enableR8=true

BMI-Calculator-Flutter/android/gradle/wrapper/gradle-wrapper.properties

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+#Fri Jun 23 08:50:38 CEST 2017
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip

BMI-Calculator-Flutter/android/settings.gradle

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+include ':app'
+
+def flutterProjectRoot = rootProject.projectDir.parentFile.toPath()
+
+def plugins = new Properties()
+def pluginsFile = new File(flutterProjectRoot.toFile(), '.flutter-plugins')
+if (pluginsFile.exists()) {
+    pluginsFile.withReader('UTF-8') { reader -> plugins.load(reader) }
+}
+
+plugins.each { name, path ->
+    def pluginDirectory = flutterProjectRoot.resolve(path).resolve('android').toFile()
+    include ":$name"
+    project(":$name").projectDir = pluginDirectory
+}

BMI-Calculator-Flutter/ios/Flutter/AppFrameworkInfo.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+  <key>CFBundleDevelopmentRegion</key>
+  <string>en</string>
+  <key>CFBundleExecutable</key>
+  <string>App</string>
+  <key>CFBundleIdentifier</key>
+  <string>io.flutter.flutter.app</string>
+  <key>CFBundleInfoDictionaryVersion</key>
+  <string>6.0</string>
+  <key>CFBundleName</key>
+  <string>App</string>
+  <key>CFBundlePackageType</key>
+  <string>FMWK</string>
+  <key>CFBundleShortVersionString</key>
+  <string>1.0</string>
+  <key>CFBundleSignature</key>
+  <string>????</string>
+  <key>CFBundleVersion</key>
+  <string>1.0</string>
+  <key>MinimumOSVersion</key>
+  <string>8.0</string>
+</dict>
+</plist>

BMI-Calculator-Flutter/ios/Flutter/Debug.xcconfig

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+#include "Generated.xcconfig"

BMI-Calculator-Flutter/ios/Flutter/Release.xcconfig

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+#include "Generated.xcconfig"

BMI-Calculator-Flutter/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata

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+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:Runner.xcodeproj">
+   </FileRef>
+</Workspace>

BMI-Calculator-Flutter/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme

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+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "0910"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+               BuildableName = "Runner.app"
+               BlueprintName = "Runner"
+               ReferencedContainer = "container:Runner.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      language = ""
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+      </Testables>
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      language = ""
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Profile"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

BMI-Calculator-Flutter/ios/Runner.xcworkspace/contents.xcworkspacedata

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+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:Runner.xcodeproj">
+   </FileRef>
+</Workspace>

BMI-Calculator-Flutter/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>BuildSystemType</key>
+	<string>Original</string>
+</dict>
+</plist>

BMI-Calculator-Flutter/ios/Runner/AppDelegate.h

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+#import <Flutter/Flutter.h>
+#import <UIKit/UIKit.h>
+
+@interface AppDelegate : FlutterAppDelegate
+
+@end

BMI-Calculator-Flutter/ios/Runner/AppDelegate.m

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+#include "AppDelegate.h"
+#include "GeneratedPluginRegistrant.h"
+
+@implementation AppDelegate
+
+- (BOOL)application:(UIApplication *)application
+    didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+  [GeneratedPluginRegistrant registerWithRegistry:self];
+  // Override point for customization after application launch.
+  return [super application:application didFinishLaunchingWithOptions:launchOptions];
+}
+
+@end

BMI-Calculator-Flutter/ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json

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+{
+  "images" : [
+    {
+      "size" : "20x20",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-20x20@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-20x20@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-40x40@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-40x40@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-60x60@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-60x60@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-20x20@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-20x20@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-29x29@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-29x29@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-40x40@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-40x40@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "76x76",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-76x76@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "76x76",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-76x76@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "83.5x83.5",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-83.5x83.5@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "1024x1024",
+      "idiom" : "ios-marketing",
+      "filename" : "Icon-App-1024x1024@1x.png",
+      "scale" : "1x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

BMI-Calculator-Flutter/ios/Runner/Assets.xcassets/LaunchImage.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

BMI-Calculator-Flutter/ios/Runner/Assets.xcassets/LaunchImage.imageset/README.md

@@ -0,0 +1,5 @@
+# Launch Screen Assets
+
+You can customize the launch screen with your own desired assets by replacing the image files in this directory.
+
+You can also do it by opening your Flutter project's Xcode project with `open ios/Runner.xcworkspace`, selecting `Runner/Assets.xcassets` in the Project Navigator and dropping in the desired images.

BMI-Calculator-Flutter/ios/Runner/Base.lproj/LaunchScreen.storyboard

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="12121" systemVersion="16G29" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="12089"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="Ydg-fD-yQy"/>
+                        <viewControllerLayoutGuide type="bottom" id="xbc-2k-c8Z"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <imageView opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" image="LaunchImage" translatesAutoresizingMaskIntoConstraints="NO" id="YRO-k0-Ey4">
+                            </imageView>
+                        </subviews>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <constraints>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerX" secondItem="Ze5-6b-2t3" secondAttribute="centerX" id="1a2-6s-vTC"/>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerY" secondItem="Ze5-6b-2t3" secondAttribute="centerY" id="4X2-HB-R7a"/>
+                        </constraints>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+    <resources>
+        <image name="LaunchImage" width="168" height="185"/>
+    </resources>
+</document>

BMI-Calculator-Flutter/ios/Runner/Base.lproj/Main.storyboard

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="10117" systemVersion="15F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="10085"/>
+    </dependencies>
+    <scenes>
+        <!--Flutter View Controller-->
+        <scene sceneID="tne-QT-ifu">
+            <objects>
+                <viewController id="BYZ-38-t0r" customClass="FlutterViewController" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
+                        <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+            </objects>
+        </scene>
+    </scenes>
+</document>

BMI-Calculator-Flutter/ios/Runner/Info.plist

@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>bmi_calculator</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>$(FLUTTER_BUILD_NAME)</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>$(FLUTTER_BUILD_NUMBER)</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UIViewControllerBasedStatusBarAppearance</key>
+	<false/>
+</dict>
+</plist>

BMI-Calculator-Flutter/ios/Runner/main.m

@@ -0,0 +1,9 @@
+#import <Flutter/Flutter.h>
+#import <UIKit/UIKit.h>
+#import "AppDelegate.h"
+
+int main(int argc, char* argv[]) {
+  @autoreleasepool {
+    return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
+  }
+}

BMI-Calculator-Flutter/lib/calculator_brain.dart

@@ -0,0 +1,35 @@
+import 'dart:math';
+
+class CalculatorBrain {
+  CalculatorBrain({this.height, this.weight});
+
+  final int height;
+  final int weight;
+
+  double _bmi;
+
+  String calculateBMI() {
+    _bmi = weight / pow(height / 100, 2);
+    return _bmi.toStringAsFixed(1);
+  }
+
+  String getResult() {
+    if (_bmi >= 25) {
+      return 'Overweight';
+    } else if (_bmi > 18.5) {
+      return 'Normal';
+    } else {
+      return 'Underweight';
+    }
+  }
+
+  String getInterpretation() {
+    if (_bmi >= 25) {
+      return 'You have a higher than normal body weight. Try to exercise more.';
+    } else if (_bmi >= 18.5) {
+      return 'You have a normal body weight. Good job!';
+    } else {
+      return 'You have a lower than normal body weight. You can eat a bit more.';
+    }
+  }
+}

BMI-Calculator-Flutter/lib/components/bottom_button.dart

@@ -0,0 +1,29 @@
+import 'package:flutter/material.dart';
+import 'package:bmi_calculator/constants.dart';
+
+class BottomButton extends StatelessWidget {
+  BottomButton({@required this.onTap, @required this.buttonTitle});
+
+  final Function onTap;
+  final String buttonTitle;
+
+  @override
+  Widget build(BuildContext context) {
+    return GestureDetector(
+      onTap: onTap,
+      child: Container(
+        child: Center(
+          child: Text(
+            buttonTitle,
+            style: kLargeButtonTextStyle,
+          ),
+        ),
+        color: kBottomContainerColour,
+        margin: EdgeInsets.only(top: 10.0),
+        padding: EdgeInsets.only(bottom: 20.0),
+        width: double.infinity,
+        height: kBottomContainerHeight,
+      ),
+    );
+  }
+}

BMI-Calculator-Flutter/lib/components/icon_content.dart

@@ -0,0 +1,29 @@
+import 'package:flutter/material.dart';
+import 'package:bmi_calculator/constants.dart';
+
+class IconContent extends StatelessWidget {
+  IconContent({this.icon, this.label});
+
+  final IconData icon;
+  final String label;
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      mainAxisAlignment: MainAxisAlignment.center,
+      children: <Widget>[
+        Icon(
+          icon,
+          size: 80.0,
+        ),
+        SizedBox(
+          height: 15.0,
+        ),
+        Text(
+          label,
+          style: kLabelTextStyle,
+        )
+      ],
+    );
+  }
+}

BMI-Calculator-Flutter/lib/components/reusable_card.dart

@@ -0,0 +1,24 @@
+import 'package:flutter/material.dart';
+
+class ReusableCard extends StatelessWidget {
+  ReusableCard({@required this.colour, this.cardChild, this.onPress});
+
+  final Color colour;
+  final Widget cardChild;
+  final Function onPress;
+
+  @override
+  Widget build(BuildContext context) {
+    return GestureDetector(
+      onTap: onPress,
+      child: Container(
+        child: cardChild,
+        margin: EdgeInsets.all(15.0),
+        decoration: BoxDecoration(
+          color: colour,
+          borderRadius: BorderRadius.circular(10.0),
+        ),
+      ),
+    );
+  }
+}

BMI-Calculator-Flutter/lib/components/round_icon_button.dart

@@ -0,0 +1,23 @@
+import 'package:flutter/material.dart';
+
+class RoundIconButton extends StatelessWidget {
+  RoundIconButton({@required this.icon, @required this.onPressed});
+
+  final IconData icon;
+  final Function onPressed;
+
+  @override
+  Widget build(BuildContext context) {
+    return RawMaterialButton(
+      elevation: 0.0,
+      child: Icon(icon),
+      onPressed: onPressed,
+      constraints: BoxConstraints.tightFor(
+        width: 56.0,
+        height: 56.0,
+      ),
+      shape: CircleBorder(),
+      fillColor: Color(0xFF4C4F5E),
+    );
+  }
+}

BMI-Calculator-Flutter/lib/constants.dart

@@ -0,0 +1,41 @@
+import 'package:flutter/material.dart';
+
+const kBottomContainerHeight = 80.0;
+const kActiveCardColour = Color(0xFF1D1E33);
+const kInactiveCardColour = Color(0xFF111328);
+const kBottomContainerColour = Color(0xFFEB1555);
+
+const kLabelTextStyle = TextStyle(
+  fontSize: 18.0,
+  color: Color(0xFF8D8E98),
+);
+
+const kNumberTextStyle = TextStyle(
+  fontSize: 50.0,
+  fontWeight: FontWeight.w900,
+);
+
+const kLargeButtonTextStyle = TextStyle(
+  fontSize: 25.0,
+  fontWeight: FontWeight.bold,
+);
+
+const kTitleTextStyle = TextStyle(
+  fontSize: 50.0,
+  fontWeight: FontWeight.bold,
+);
+
+const kResultTextStyle = TextStyle(
+  color: Color(0xFF24D876),
+  fontSize: 22.0,
+  fontWeight: FontWeight.bold,
+);
+
+const kBMITextStyle = TextStyle(
+  fontSize: 100.0,
+  fontWeight: FontWeight.bold,
+);
+
+const kBodyTextStyle = TextStyle(
+  fontSize: 22.0,
+);

BMI-Calculator-Flutter/lib/main.dart

@@ -0,0 +1,17 @@
+import 'package:flutter/material.dart';
+import 'package:bmi_calculator/screens/input_page.dart';
+
+void main() => runApp(BMICalculator());
+
+class BMICalculator extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      theme: ThemeData.dark().copyWith(
+        primaryColor: Color(0xFF0A0E21),
+        scaffoldBackgroundColor: Color(0xFF0A0E21),
+      ),
+      home: InputPage(),
+    );
+  }
+}

BMI-Calculator-Flutter/lib/screens/input_page.dart

@@ -0,0 +1,236 @@
+import 'package:flutter/material.dart';
+import 'package:font_awesome_flutter/font_awesome_flutter.dart';
+import 'package:bmi_calculator/components/icon_content.dart';
+import 'package:bmi_calculator/components/reusable_card.dart';
+import 'package:bmi_calculator/constants.dart';
+import 'package:bmi_calculator/screens/results_page.dart';
+import 'package:bmi_calculator/components/bottom_button.dart';
+import 'package:bmi_calculator/components/round_icon_button.dart';
+import 'package:bmi_calculator/calculator_brain.dart';
+
+enum Gender {
+  male,
+  female,
+}
+
+class InputPage extends StatefulWidget {
+  @override
+  _InputPageState createState() => _InputPageState();
+}
+
+class _InputPageState extends State<InputPage> {
+  Gender selectedGender;
+  int height = 180;
+  int weight = 60;
+  int age = 20;
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text('BMI CALCULATOR'),
+      ),
+      body: Column(
+        crossAxisAlignment: CrossAxisAlignment.stretch,
+        children: <Widget>[
+          Expanded(
+              child: Row(
+            children: <Widget>[
+              Expanded(
+                child: ReusableCard(
+                  onPress: () {
+                    setState(() {
+                      selectedGender = Gender.male;
+                    });
+                  },
+                  colour: selectedGender == Gender.male
+                      ? kActiveCardColour
+                      : kInactiveCardColour,
+                  cardChild: IconContent(
+                    icon: FontAwesomeIcons.mars,
+                    label: 'MALE',
+                  ),
+                ),
+              ),
+              Expanded(
+                child: ReusableCard(
+                  onPress: () {
+                    setState(() {
+                      selectedGender = Gender.female;
+                    });
+                  },
+                  colour: selectedGender == Gender.female
+                      ? kActiveCardColour
+                      : kInactiveCardColour,
+                  cardChild: IconContent(
+                    icon: FontAwesomeIcons.venus,
+                    label: 'FEMALE',
+                  ),
+                ),
+              ),
+            ],
+          )),
+          Expanded(
+            child: ReusableCard(
+              colour: kActiveCardColour,
+              cardChild: Column(
+                mainAxisAlignment: MainAxisAlignment.center,
+                children: <Widget>[
+                  Text(
+                    'HEIGHT',
+                    style: kLabelTextStyle,
+                  ),
+                  Row(
+                    mainAxisAlignment: MainAxisAlignment.center,
+                    crossAxisAlignment: CrossAxisAlignment.baseline,
+                    textBaseline: TextBaseline.alphabetic,
+                    children: <Widget>[
+                      Text(
+                        height.toString(),
+                        style: kNumberTextStyle,
+                      ),
+                      Text(
+                        'cm',
+                        style: kLabelTextStyle,
+                      )
+                    ],
+                  ),
+                  SliderTheme(
+                    data: SliderTheme.of(context).copyWith(
+                      inactiveTrackColor: Color(0xFF8D8E98),
+                      activeTrackColor: Colors.white,
+                      thumbColor: Color(0xFFEB1555),
+                      overlayColor: Color(0x29EB1555),
+                      thumbShape:
+                          RoundSliderThumbShape(enabledThumbRadius: 15.0),
+                      overlayShape:
+                          RoundSliderOverlayShape(overlayRadius: 30.0),
+                    ),
+                    child: Slider(
+                      value: height.toDouble(),
+                      min: 120.0,
+                      max: 220.0,
+                      onChanged: (double newValue) {
+                        setState(() {
+                          height = newValue.round();
+                        });
+                      },
+                    ),
+                  ),
+                ],
+              ),
+            ),
+          ),
+          Expanded(
+            child: Row(
+              children: <Widget>[
+                Expanded(
+                  child: ReusableCard(
+                    colour: kActiveCardColour,
+                    cardChild: Column(
+                      mainAxisAlignment: MainAxisAlignment.center,
+                      children: <Widget>[
+                        Text(
+                          'WEIGHT',
+                          style: kLabelTextStyle,
+                        ),
+                        Text(
+                          weight.toString(),
+                          style: kNumberTextStyle,
+                        ),
+                        Row(
+                          mainAxisAlignment: MainAxisAlignment.center,
+                          children: <Widget>[
+                            RoundIconButton(
+                                icon: FontAwesomeIcons.minus,
+                                onPressed: () {
+                                  setState(() {
+                                    weight--;
+                                  });
+                                }),
+                            SizedBox(
+                              width: 10.0,
+                            ),
+                            RoundIconButton(
+                              icon: FontAwesomeIcons.plus,
+                              onPressed: () {
+                                setState(() {
+                                  weight++;
+                                });
+                              },
+                            ),
+                          ],
+                        ),
+                      ],
+                    ),
+                  ),
+                ),
+                Expanded(
+                  child: ReusableCard(
+                    colour: kActiveCardColour,
+                    cardChild: Column(
+                      mainAxisAlignment: MainAxisAlignment.center,
+                      children: <Widget>[
+                        Text(
+                          'AGE',
+                          style: kLabelTextStyle,
+                        ),
+                        Text(
+                          age.toString(),
+                          style: kNumberTextStyle,
+                        ),
+                        Row(
+                          mainAxisAlignment: MainAxisAlignment.center,
+                          children: <Widget>[
+                            RoundIconButton(
+                              icon: FontAwesomeIcons.minus,
+                              onPressed: () {
+                                setState(
+                                  () {
+                                    age--;
+                                  },
+                                );
+                              },
+                            ),
+                            SizedBox(
+                              width: 10.0,
+                            ),
+                            RoundIconButton(
+                                icon: FontAwesomeIcons.plus,
+                                onPressed: () {
+                                  setState(() {
+                                    age++;
+                                  });
+                                })
+                          ],
+                        )
+                      ],
+                    ),
+                  ),
+                ),
+              ],
+            ),
+          ),
+          BottomButton(
+            buttonTitle: 'CALCULATE',
+            onTap: () {
+              CalculatorBrain calc =
+                  CalculatorBrain(height: height, weight: weight);
+
+              Navigator.push(
+                context,
+                MaterialPageRoute(
+                  builder: (context) => ResultsPage(
+                        bmiResult: calc.calculateBMI(),
+                        resultText: calc.getResult(),
+                        interpretation: calc.getInterpretation(),
+                      ),
+                ),
+              );
+            },
+          ),
+        ],
+      ),
+    );
+  }
+}

BMI-Calculator-Flutter/lib/screens/results_page.dart

@@ -0,0 +1,71 @@
+import 'package:flutter/material.dart';
+import 'package:bmi_calculator/constants.dart';
+import 'package:bmi_calculator/components/reusable_card.dart';
+import 'package:bmi_calculator/components/bottom_button.dart';
+
+class ResultsPage extends StatelessWidget {
+  ResultsPage(
+      {@required this.interpretation,
+      @required this.bmiResult,
+      @required this.resultText});
+
+  final String bmiResult;
+  final String resultText;
+  final String interpretation;
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text('BMI CALCULATOR'),
+      ),
+      body: Column(
+        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
+        crossAxisAlignment: CrossAxisAlignment.stretch,
+        children: <Widget>[
+          Expanded(
+            child: Container(
+              padding: EdgeInsets.all(15.0),
+              alignment: Alignment.bottomLeft,
+              child: Text(
+                'Your Result',
+                style: kTitleTextStyle,
+              ),
+            ),
+          ),
+          Expanded(
+            flex: 5,
+            child: ReusableCard(
+              colour: kActiveCardColour,
+              cardChild: Column(
+                mainAxisAlignment: MainAxisAlignment.spaceEvenly,
+                crossAxisAlignment: CrossAxisAlignment.center,
+                children: <Widget>[
+                  Text(
+                    resultText.toUpperCase(),
+                    style: kResultTextStyle,
+                  ),
+                  Text(
+                    bmiResult,
+                    style: kBMITextStyle,
+                  ),
+                  Text(
+                    interpretation,
+                    textAlign: TextAlign.center,
+                    style: kBodyTextStyle,
+                  ),
+                ],
+              ),
+            ),
+          ),
+          BottomButton(
+            buttonTitle: 'RE-CALCULATE',
+            onTap: () {
+              Navigator.pop(context);
+            },
+          )
+        ],
+      ),
+    );
+  }
+}

BMI-Calculator-Flutter/pubspec.yaml

@@ -0,0 +1,21 @@
+name: bmi_calculator
+description: A new Flutter application.
+
+version: 1.0.0+1
+
+environment:
+  sdk: ">=2.1.0 <3.0.0"
+
+dependencies:
+  flutter:
+    sdk: flutter
+
+  cupertino_icons: ^0.1.2
+  font_awesome_flutter: ^8.4.0
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+
+flutter:
+  uses-material-design: true