Этап 1: Змейка на Jetpack Compose

Простое Android-приложение для студентов: классическая «Змейка»
на одном экране (Compose Canvas + игровой цикл на корутине).

- управление свайпами, тап для рестарта
- сетка 20x30, рост змейки, счёт и рекорд за сессию
- стек: Kotlin, Jetpack Compose, AGP 8.13.2 / Gradle 8.13

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitignore

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+# Android / Gradle
+*.iml
+.gradle/
+/local.properties
+/.idea/
+.DS_Store
+/build/
+/app/build/
+/captures/
+.externalNativeBuild/
+.cxx/
+
+# Build outputs
+*.apk
+*.aab
+*.ap_
+*.dex
+*.class
+
+# Keystore / секреты
+*.keystore
+*.jks

README.md

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+# 🐍 Змейка на Jetpack Compose
+
+Учебный пример простого Android-приложения для студентов: классическая игра
+«Змейка» на одном экране. Цель примера — показать, как устроено реальное
+Android-приложение на современном стеке (Kotlin + Jetpack Compose) без лишней
+сложности.
+
+## Что внутри
+
+- Игровое поле-сетка 20×30
+- Управление **свайпами** (вверх/вниз/влево/вправо)
+- Змейка растёт, когда съедает еду; ведётся счёт и рекорд за сессию
+- Столкновение со стеной или с собой = Game Over, **тап** — рестарт
+- Вся отрисовка — через Compose `Canvas`, игровой цикл — на корутине
+
+## Стек
+
+| Что | Версия |
+|-----|--------|
+| Язык | Kotlin 2.0.20 |
+| UI | Jetpack Compose (BOM 2024.10.01, Material 3) |
+| Android Gradle Plugin | 8.13.2 |
+| Gradle | 8.13 |
+| compileSdk / minSdk | 36 / 24 |
+
+## Как запустить
+
+### Вариант 1: Android Studio (рекомендуется)
+1. Открыть папку проекта в Android Studio (**File → Open**).
+2. Дождаться Gradle Sync.
+3. Подключить телефон по USB (с включённой *отладкой по USB*) или запустить эмулятор.
+4. Нажать ▶ **Run**.
+
+### Вариант 2: командная строка
+```bash
+# нужен JDK 17+ и установленный Android SDK
+./gradlew installDebug    # соберёт и поставит приложение на подключённое устройство
+```
+> Файл `local.properties` с путём к SDK создаётся автоматически Android Studio
+> и **не** хранится в репозитории — у каждого свой путь.
+
+## Структура проекта
+
+```
+app/src/main/
+├── java/com/example/snake/
+│   ├── MainActivity.kt   # точка входа: ComponentActivity + setContent { SnakeGame() }
+│   └── SnakeGame.kt      # вся игра: состояние, игровой цикл, отрисовка, управление
+├── res/values/themes.xml # тема приложения
+└── AndroidManifest.xml
+```
+
+👉 **Главный файл для изучения — [`SnakeGame.kt`](app/src/main/java/com/example/snake/SnakeGame.kt).**
+Там по шагам видно идеи Compose:
+- состояние через `remember { mutableStateOf(...) }` — UI сам перерисовывается при его изменении;
+- игровой цикл через `LaunchedEffect { while(true) { delay(); step() } }`;
+- ввод через `Modifier.pointerInput { detectTapGestures / detectDragGestures }`;
+- рисование через `Canvas { drawRoundRect / drawLine }`.
+
+## Управление
+
+| Действие | Жест |
+|----------|------|
+| Начать игру | свайп или тап |
+| Повернуть | свайп ↑ ↓ ← → |
+| Рестарт после проигрыша | тап по экрану |
+
+## Этапы (ветки)
+
+Проект задуман как серия этапов — каждый в своей ветке, чтобы можно было
+сравнивать версии:
+
+- **`snake-stage-1`** — базовая рабочая игра (этот код).
+
+Идеи для следующих этапов: ускорение с ростом счёта, сохранение рекорда через
+`DataStore`, экранные кнопки-стрелки, анимации.

app/build.gradle.kts

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+plugins {
+    id("com.android.application")
+    id("org.jetbrains.kotlin.android")
+    id("org.jetbrains.kotlin.plugin.compose")
+}
+
+android {
+    namespace = "com.example.snake"
+    compileSdk = 36
+
+    defaultConfig {
+        applicationId = "com.example.snake"
+        minSdk = 24
+        targetSdk = 34
+        versionCode = 1
+        versionName = "1.0"
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+    kotlinOptions {
+        jvmTarget = "17"
+    }
+
+    buildFeatures {
+        compose = true
+    }
+}
+
+dependencies {
+    implementation("androidx.core:core-ktx:1.13.1")
+    implementation("androidx.activity:activity-compose:1.9.3")
+    implementation(platform("androidx.compose:compose-bom:2024.10.01"))
+    implementation("androidx.compose.ui:ui")
+    implementation("androidx.compose.foundation:foundation")
+    implementation("androidx.compose.material3:material3")
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <application
+        android:allowBackup="true"
+        android:label="Snake"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.Snake">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:screenOrientation="portrait"
+            android:configChanges="orientation|screenSize|keyboardHidden">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/com/example/snake/MainActivity.kt

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+package com.example.snake
+
+import android.os.Bundle
+import android.view.WindowManager
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+
+class MainActivity : ComponentActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        // Не гасим экран во время игры
+        window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
+        setContent {
+            SnakeGame()
+        }
+    }
+}

app/src/main/java/com/example/snake/SnakeGame.kt

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+package com.example.snake
+
+import androidx.compose.foundation.Canvas
+import androidx.compose.foundation.background
+import androidx.compose.foundation.gestures.detectDragGestures
+import androidx.compose.foundation.gestures.detectTapGestures
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableIntStateOf
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.geometry.CornerRadius
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.geometry.Size
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.drawscope.DrawScope
+import androidx.compose.ui.input.pointer.pointerInput
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import androidx.compose.material3.Text
+import kotlinx.coroutines.delay
+import kotlin.math.abs
+import kotlin.random.Random
+
+// --- Параметры игры ---
+private const val COLS = 20
+private const val ROWS = 30
+private const val STEP_MS = 130L
+
+/** Клетка поля / сегмент змейки. Direction тоже храним как Cell (dx, dy). */
+private data class Cell(val x: Int, val y: Int)
+
+// --- Цвета ---
+private val BG = Color(0xFF10131A)
+private val FIELD = Color(0xFF10131A)
+private val GRID = Color(0xFF171C28)
+private val BODY = Color(0xFF4CD964)
+private val HEAD = Color(0xFF2ECC71)
+private val FOOD = Color(0xFFFF453A)
+
+@Composable
+fun SnakeGame() {
+    // Начальная змейка из 3 клеток, смотрит вверх
+    val startSnake = listOf(Cell(COLS / 2, ROWS / 2), Cell(COLS / 2, ROWS / 2 + 1), Cell(COLS / 2, ROWS / 2 + 2))
+
+    var snake by remember { mutableStateOf(startSnake) }
+    var dir by remember { mutableStateOf(Cell(0, -1)) }       // текущее направление
+    var nextDir by remember { mutableStateOf(Cell(0, -1)) }   // заданное игроком на след. шаг
+    var food by remember { mutableStateOf(randomFreeCell(startSnake)) }
+    var score by remember { mutableIntStateOf(0) }
+    var best by remember { mutableIntStateOf(0) }
+    var started by remember { mutableStateOf(false) }
+    var gameOver by remember { mutableStateOf(false) }
+
+    fun reset() {
+        snake = startSnake
+        dir = Cell(0, -1)
+        nextDir = Cell(0, -1)
+        food = randomFreeCell(startSnake)
+        score = 0
+        gameOver = false
+    }
+
+    // Один шаг змейки
+    fun step() {
+        dir = nextDir
+        val head = snake.first()
+        val nh = Cell(head.x + dir.x, head.y + dir.y)
+
+        val hitWall = nh.x < 0 || nh.y < 0 || nh.x >= COLS || nh.y >= ROWS
+        if (hitWall || snake.contains(nh)) {
+            gameOver = true
+            return
+        }
+
+        val grew = nh == food
+        // голова добавляется в начало; хвост убираем, если не съели еду
+        snake = if (grew) listOf(nh) + snake else listOf(nh) + snake.dropLast(1)
+        if (grew) {
+            score++
+            if (score > best) best = score
+            food = randomFreeCell(snake)
+        }
+    }
+
+    // Игровой цикл на корутине — пока компонент в композиции
+    LaunchedEffect(Unit) {
+        while (true) {
+            delay(STEP_MS)
+            if (started && !gameOver) step()
+        }
+    }
+
+    androidx.compose.foundation.layout.Box(
+        modifier = Modifier
+            .fillMaxSize()
+            .background(BG)
+            // Тапы: старт игры и рестарт после проигрыша
+            .pointerInput(Unit) {
+                detectTapGestures {
+                    if (gameOver) {
+                        reset()
+                        started = true
+                    } else if (!started) {
+                        started = true
+                    }
+                }
+            }
+            // Свайпы: смена направления (и старт первым свайпом)
+            .pointerInput(Unit) {
+                var total = Offset.Zero
+                detectDragGestures(
+                    onDragStart = {
+                        total = Offset.Zero
+                        if (!started && !gameOver) started = true
+                    },
+                    onDragEnd = {
+                        if (started && !gameOver) {
+                            if (abs(total.x) > abs(total.y)) {
+                                if (total.x > 0 && dir.x != -1) nextDir = Cell(1, 0)
+                                else if (total.x < 0 && dir.x != 1) nextDir = Cell(-1, 0)
+                            } else {
+                                if (total.y > 0 && dir.y != -1) nextDir = Cell(0, 1)
+                                else if (total.y < 0 && dir.y != 1) nextDir = Cell(0, -1)
+                            }
+                        }
+                    }
+                ) { change, drag ->
+                    total += drag
+                    change.consume()
+                }
+            }
+    ) {
+        // Игровое поле
+        Canvas(modifier = Modifier.fillMaxSize()) {
+            drawBoard(snake, food)
+        }
+
+        // Счёт сверху
+        Text(
+            text = "Счёт: $score    Рекорд: $best",
+            color = Color.White,
+            fontSize = 20.sp,
+            modifier = Modifier
+                .align(Alignment.TopCenter)
+                .padding(top = 48.dp)
+        )
+
+        // Оверлеи: старт и проигрыш
+        if (!started) {
+            Overlay(title = "ЗМЕЙКА", subtitle = "Свайпни, чтобы начать", modifier = Modifier.align(Alignment.Center))
+        } else if (gameOver) {
+            Overlay(title = "GAME OVER", subtitle = "Счёт: $score · тапни для рестарта", modifier = Modifier.align(Alignment.Center))
+        }
+    }
+}
+
+@Composable
+private fun Overlay(title: String, subtitle: String, modifier: Modifier = Modifier) {
+    Column(
+        modifier = modifier,
+        horizontalAlignment = Alignment.CenterHorizontally,
+        verticalArrangement = Arrangement.Center
+    ) {
+        Text(text = title, color = Color.White, fontSize = 44.sp, fontWeight = FontWeight.Bold)
+        Text(text = subtitle, color = Color(0xFFB0B6C0), fontSize = 16.sp, modifier = Modifier.padding(top = 12.dp))
+    }
+}
+
+/** Вся отрисовка поля внутри DrawScope. */
+private fun DrawScope.drawBoard(snake: List<Cell>, food: Cell) {
+    val cell = minOf(size.width / COLS, size.height / ROWS)
+    val offX = (size.width - cell * COLS) / 2f
+    val offY = (size.height - cell * ROWS) / 2f
+
+    // фон поля
+    drawRect(color = FIELD, topLeft = Offset(offX, offY), size = Size(cell * COLS, cell * ROWS))
+
+    // сетка
+    for (i in 0..COLS) {
+        val x = offX + i * cell
+        drawLine(GRID, Offset(x, offY), Offset(x, offY + cell * ROWS), strokeWidth = 1f)
+    }
+    for (j in 0..ROWS) {
+        val y = offY + j * cell
+        drawLine(GRID, Offset(offX, y), Offset(offX + cell * COLS, y), strokeWidth = 1f)
+    }
+
+    // еда
+    drawCell(food, FOOD, cell, offX, offY)
+
+    // змейка (голова — другим цветом)
+    snake.forEachIndexed { idx, c ->
+        drawCell(c, if (idx == 0) HEAD else BODY, cell, offX, offY)
+    }
+}
+
+private fun DrawScope.drawCell(c: Cell, color: Color, cell: Float, offX: Float, offY: Float) {
+    val pad = cell * 0.08f
+    drawRoundRect(
+        color = color,
+        topLeft = Offset(offX + c.x * cell + pad, offY + c.y * cell + pad),
+        size = Size(cell - 2 * pad, cell - 2 * pad),
+        cornerRadius = CornerRadius(cell * 0.25f, cell * 0.25f)
+    )
+}
+
+/** Случайная свободная клетка (не занятая змейкой) — для появления еды. */
+private fun randomFreeCell(snake: List<Cell>): Cell {
+    while (true) {
+        val p = Cell(Random.nextInt(COLS), Random.nextInt(ROWS))
+        if (!snake.contains(p)) return p
+    }
+}

app/src/main/res/values/themes.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="Theme.Snake" parent="@android:style/Theme.Material.NoActionBar">
+        <item name="android:statusBarColor">#10131A</item>
+        <item name="android:navigationBarColor">#10131A</item>
+        <item name="android:windowBackground">#10131A</item>
+    </style>
+</resources>

build.gradle.kts

@@ -0,0 +1,5 @@
+plugins {
+    id("com.android.application") version "8.13.2" apply false
+    id("org.jetbrains.kotlin.android") version "2.0.20" apply false
+    id("org.jetbrains.kotlin.plugin.compose") version "2.0.20" apply false
+}

gradle.properties

@@ -0,0 +1,4 @@
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+android.useAndroidX=true
+kotlin.code.style=official
+android.suppressUnsupportedCompileSdk=36

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,249 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,92 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle.kts

@@ -0,0 +1,15 @@
+pluginManagement {
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+dependencyResolutionManagement {
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+rootProject.name = "SnakeGame"
+include(":app")