Add All the files from the touchpad_demonstrator Flutter App which can be build for Android and iOS

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 GradleException("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 plugin: 'kotlin-android'
+apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
+
+android {
+    compileSdkVersion 28
+
+    sourceSets {
+        main.java.srcDirs += 'src/main/kotlin'
+    }
+
+    lintOptions {
+        disable 'InvalidPackage'
+    }
+
+    defaultConfig {
+        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
+        applicationId "com.example.touchdemonstrator"
+        minSdkVersion 21//19
+        targetSdkVersion 28
+        versionCode flutterVersionCode.toInteger()
+        versionName flutterVersionName
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        multiDexEnabled true //NEW
+    }
+
+    buildTypes {
+        release {
+            // TODO: Add your own signing config for the release build.
+            // Signing with the debug keys for now, so `flutter run --release` works.
+            signingConfig signingConfigs.debug
+        }
+    }
+}
+
+flutter {
+    source '../..'
+}
+
+dependencies {
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'com.android.support.test:runner:1.0.2'
+    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+    implementation 'com.android.support:multidex:1.0.3' // new
+}

android/app/src/main/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.touchdemonstrator">
+
+    <!-- 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"/>
+    <uses-permission android:name="android.permission.VIBRATE"/>
+    <uses-permission android:name="android.permission.WAKE_LOCK" />
+    <!-- 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="Touch Demonstrator"
+        android:icon="@mipmap/launcher_icon">
+        <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>

android/app/src/main/java/io/flutter/plugins/GeneratedPluginRegistrant.java

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+package io.flutter.plugins;
+
+import io.flutter.plugin.common.PluginRegistry;
+import com.pauldemarco.flutterblue.FlutterBluePlugin;
+import flutter.plugins.screen.screen.ScreenPlugin;
+import flutter.plugins.vibrate.VibratePlugin;
+import io.flutter.plugins.webviewflutter.WebViewFlutterPlugin;
+
+/**
+ * Generated file. Do not edit.
+ */
+public final class GeneratedPluginRegistrant {
+  public static void registerWith(PluginRegistry registry) {
+    if (alreadyRegisteredWith(registry)) {
+      return;
+    }
+    FlutterBluePlugin.registerWith(registry.registrarFor("com.pauldemarco.flutterblue.FlutterBluePlugin"));
+    ScreenPlugin.registerWith(registry.registrarFor("flutter.plugins.screen.screen.ScreenPlugin"));
+    VibratePlugin.registerWith(registry.registrarFor("flutter.plugins.vibrate.VibratePlugin"));
+    WebViewFlutterPlugin.registerWith(registry.registrarFor("io.flutter.plugins.webviewflutter.WebViewFlutterPlugin"));
+  }
+
+  private static boolean alreadyRegisteredWith(PluginRegistry registry) {
+    final String key = GeneratedPluginRegistrant.class.getCanonicalName();
+    if (registry.hasPlugin(key)) {
+      return true;
+    }
+    registry.registrarFor(key);
+    return false;
+  }
+}

android/app/src/main/kotlin/com/example/touchdemonstrator/MainActivity.kt

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+package com.example.touchdemonstrator
+
+import android.os.Bundle
+
+import io.flutter.app.FlutterActivity
+import io.flutter.plugins.GeneratedPluginRegistrant
+
+class MainActivity(): FlutterActivity() {
+  override fun onCreate(savedInstanceState: Bundle?) {
+    super.onCreate(savedInstanceState)
+    GeneratedPluginRegistrant.registerWith(this)
+  }
+}

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>

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>