用Android studio编写一个贪吃蛇游戏

好的，下面是一个简单的贪吃蛇游戏的 Android Studio 实现：

1. 首先，我们需要创建一个新的 Android Studio 项目。在创建新项目时，请确保选择空活动（Empty Activity）模板。

2. 在 MainActivity.java 文件中，添加以下代码：

package com.example.snakegame;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Window;
import android.view.WindowManager;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // 设置窗口为全屏
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        // 隐藏标题栏
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(new GameView(this));
    }
}

3. 创建一个新的类 GameView.java，在其中添加以下代码：

package com.example.snakegame;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class GameView extends SurfaceView implements Runnable {
    private Thread thread;
    private boolean isPlaying;
    private Canvas canvas;
    private SurfaceHolder surfaceHolder;
    private Paint paint;
    private int screenWidth, screenHeight;
    private List<Point> snakePoints;
    private Point foodPoint;
    private int direction = 0;
    private int blockSize = 50;
    private int score = 0;
    private Random random;

    public GameView(Context context) {
        super(context);
        surfaceHolder = getHolder();
        paint = new Paint();
        snakePoints = new ArrayList<>();
        random = new Random();
        initGame();
    }

    private void initGame() {
        // 获取屏幕宽度和高度
        screenWidth = getResources().getDisplayMetrics().widthPixels;
        screenHeight = getResources().getDisplayMetrics().heightPixels;

        // 初始化蛇的位置
        for (int i = 0; i < 5; i++) {
            snakePoints.add(new Point(screenWidth / 2 - i * blockSize, screenHeight / 2));
        }

        // 初始化食物的位置
        int foodX = random.nextInt(screenWidth - 2 * blockSize) + blockSize;
        int foodY = random.nextInt(screenHeight - 2 * blockSize) + blockSize;
        foodPoint = new Point(foodX, foodY);
    }

    @Override
    public void run() {
        while (isPlaying) {
            update();
            draw();
            sleep();
        }
    }

    private void update() {
        // 更新蛇的位置
        Point head = snakePoints.get(0);
        switch (direction) {
            case 0: // 向上移动
                snakePoints.add(0, new Point(head.x, head.y - blockSize));
                break;
            case 1: // 向右移动
                snakePoints.add(0, new Point(head.x + blockSize, head.y));
                break;
            case 2: // 向下移动
                snakePoints.add(0, new Point(head.x, head.y + blockSize));
                break;
            case 3: // 向左移动
                snakePoints.add(0, new Point(head.x - blockSize, head.y));
                break;
        }

        // 判断蛇是否吃到食物
        if (snakePoints.get(0).equals(foodPoint)) {
            // 重新生成食物的位置
            int foodX = random.nextInt(screenWidth - 2 * blockSize) + blockSize;
            int foodY = random.nextInt(screenHeight - 2 * blockSize) + blockSize;
            foodPoint = new Point(foodX, foodY);
            score += 10;
        } else {
            snakePoints.remove(snakePoints.size() - 1);
        }

        // 判断蛇是否撞到墙或自己
        Point head2 = snakePoints.get(0);
        if (head2.x < 0 || head2.x > screenWidth - blockSize || head2.y < 0 || head2.y > screenHeight - blockSize) {
            isPlaying = false; // 游戏结束
        }
        for (int i = 1; i < snakePoints.size(); i++) {
            if (head2.equals(snakePoints.get(i))) {
                isPlaying = false; // 游戏结束
                break;
            }
        }
    }

    private void draw() {
        if (surfaceHolder.getSurface().isValid()) {
            canvas = surfaceHolder.lockCanvas();
            canvas.drawColor(Color.BLACK);
            paint.setColor(Color.WHITE);
            paint.setTextSize(50);
            canvas.drawText("Score: " + score, 50, 50, paint);

            // 绘制蛇
            paint.setColor(Color.GREEN);
            for (Point point : snakePoints) {
                canvas.drawRect(point.x, point.y, point.x + blockSize, point.y + blockSize, paint);
            }

            // 绘制食物
            paint.setColor(Color.RED);
            canvas.drawRect(foodPoint.x, foodPoint.y, foodPoint.x + blockSize, foodPoint.y + blockSize, paint);

            surfaceHolder.unlockCanvasAndPost(canvas);
        }
    }

    private void sleep() {
        try {
            Thread.sleep(200);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    public void pause() {
        isPlaying = false;
        try {
            thread.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    public void resume() {
        isPlaying = true;
        thread = new Thread(this);
        thread.start();
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                if (event.getX() < screenWidth / 2 && direction != 1) {
                    direction = 3; // 左
                } else if (event.getX() >= screenWidth / 2 && direction != 3) {
                    direction = 1; // 右
                }
                break;
            case MotionEvent.ACTION_UP:
                if (event.getY() < screenHeight / 2 && direction != 2) {
                    direction = 0; // 上
                } else if (event.getY() >= screenHeight / 2 && direction != 0) {
                    direction = 2; // 下
                }
                break;
        }
        return true;
    }
}

4. 修改 AndroidManifest.xml 文件，添加以下权限：

<uses-permission android:name="android.permission.WAKE_LOCK" />

5. 运行应用程序，您应该能够看到一个简单的贪吃蛇游戏。您可以使用手指滑动来控制蛇的移动方向。

希望这个简单的贪吃蛇游戏能够帮助您入门 Android Studio 开发。