Android移动应用开发 贪吃蛇小游戏

package com.example.snake.activities; import static com.example.snake.enums.State.GAMEOVER; import static com.example.snake.enums.State.GAMEPAUSE; import static com.example.snake.enums.State.GAMERUNNING; import android.annotation.SuppressLint; import android.app.Dialog; import android.os.Bundle; import android.os.Looper; import android.view.MotionEvent; import android.view.View; import android.widget.Button; import android.widget.LinearLayout; import android.widget.TextView; import androidx.appcompat.app.AlertDialog; import androidx.appcompat.app.AppCompatActivity; import com.example.snake.R; import com.example.snake.components.OverDialog; import com.example.snake.enums.Direction; import com.example.snake.enums.State; import com.example.snake.roles.Food; import com.example.snake.roles.Snake; import com.example.snake.sounds.PlaySound; import com.example.snake.views.MainCanvasView; import java.util.ArrayList; import java.util.Timer; import java.util.TimerTask; public class GameStart extends AppCompatActivity implements View.OnClickListener,View.OnTouchListener { protected Button bt_up, bt_down, bt_left, bt_right, bt_begin, bt_pause, bt_leave,bt_speed;//添加控件 protected Snake snake;//添加蛇 protected ArrayList<Food> foods;//添加食物列表 protected TextView tv_score;//计分板 protected int score = 0;//分数 protected State state;//游戏状态，开始时为暂停 protected LinearLayout layout_main;//主游戏窗口主布局 //自定义View，游戏绘制核心，重新的onDraw方法可以将游戏内容绘制到该View中 protected MainCanvasView mainCanvasView; PlaySound playSound;//音源播放类实例化 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_game_start); init();//初始化一些控件 //设置计时器,死循环执行重绘和其他方法 Timer timer = new Timer(); TimerTask timerTask = new TimerTask() { @Override public void run() { //此处写需要循环的方法 if (state == GAMEOVER) this.cancel(); //如果游戏结束，则取消计时器 if (state == GAMERUNNING) gamerunning(); //重绘自定义View，这是动起来的核心 mainCanvasView.invalidate(); } }; timer.schedule(timerTask, 0, 20);//参数：任务，延时开始时间，重复实现的时间间隔 } @SuppressLint("ClickableViewAccessibility") private void init() { //初始化各个按钮和其他控件，与布局中相应元素绑定 bt_up = findViewById(R.id.bt_up); bt_down = findViewById(R.id.bt_down); bt_left = findViewById(R.id.bt_left); bt_right = findViewById(R.id.bt_right); bt_begin = findViewById(R.id.bt_begin); bt_pause = findViewById(R.id.bt_pause); bt_leave = findViewById(R.id.bt_leave); bt_speed = findViewById(R.id.bt_speed); tv_score = findViewById(R.id.tv_score); layout_main = findViewById(R.id.layout_main); //各个按钮添加监听器 bt_up.setOnClickListener(this); bt_down.setOnClickListener(this); bt_left.setOnClickListener(this); bt_right.setOnClickListener(this); bt_begin.setOnClickListener(this); bt_pause.setOnClickListener(this); bt_leave.setOnClickListener(this); bt_speed.setOnTouchListener(this); snake = new Snake(100, 100);//初始化蛇头 foods = new ArrayList<>();//初始化食物列表 state = State.GAMEPAUSE;//刚开始是暂停的，需要开始按钮激活 playSound = new PlaySound(GameStart.this); mainCanvasView = new MainCanvasView(this); layout_main.addView(mainCanvasView); } private void gamerunning(){ //保持食物和蛇和自定义View同步，然后才能在自定义View中画出来 mainCanvasView.snake = snake;//同步蛇 mainCanvasView.foods = foods;//同步食物列表 if (foods.isEmpty()) foods.add(new Food(mainCanvasView)) ; //判断条件，添加食物 snake.move();//蛇移动 // 检测蛇出界 if(snake.isOut(mainCanvasView)){ state = GAMEOVER; playSound.overSound(); //多线程操作的时候会有一定的冲突问题，需要添加消息队列 Looper.prepare(); OverDialog overDialog = new OverDialog(this,R.style.OverDialog); overDialog.setCancelable(false); overDialog.setTitle("游戏结束！"); overDialog.setContent("您的得分为"+score); overDialog.setPositiveMessage("返回主界面", new View.OnClickListener() { @Override public void onClick(View v) { overDialog.dismiss(); finish(); } }); overDialog.show(); Looper.loop();// 进入loop中的循环，查看消息队列 } for (Food f : foods) { if (snake.eat(f)) { foods.remove(f); score+=1; tv_score.setText(String.valueOf(score)); playSound.eatSound(); } } } /* 此处注解大概意思是：资源id在Android Gradle插件版本5.0中不是final，所以避免在switch case语句中使用它们。 原因是新版本中把final字段去掉了。而switch要的所有字段必须都是final加持的，所以要解决这个问题，需要在所在方法上 添加一个注解压制警告 @SuppressLint("NonConstantResourceId")。若无这个注解，则会有高亮提示 */ @SuppressLint("NonConstantResourceId") @Override public void onClick(View v) { playSound.clickSound();//点击按钮时播放点击音效 if (state==GAMERUNNING){ switch (v.getId()){ case R.id.bt_up: { snake.direction = Direction.UP; break; } case R.id.bt_down: { snake.direction = Direction.DOWN; break; } case R.id.bt_left: { snake.direction = Direction.LEFT; break; } case R.id.bt_right: { snake.direction = Direction.RIGHT; break; } } } switch (v.getId()) { case R.id.bt_begin: { if (state == GAMEPAUSE) state = GAMERUNNING;//开始游戏 break; } case R.id.bt_pause: { if (state == GAMERUNNING) state = GAMEPAUSE;//暂停游戏 break; } case R.id.bt_leave: { state = GAMEOVER; finish();//销毁当前活动，返回上个活动 break; } default: break; } } @Override public boolean onTouch(View v, MotionEvent event) { if (v.getId()==R.id.bt_speed){ if (event.getAction()== MotionEvent.ACTION_DOWN){ snake.speed=8; v.performClick();//解除同时监听点击事件和按下事件的影响 } if (event.getAction()== MotionEvent.ACTION_UP){ snake.speed=3; } } return false; } }