【转】小游戏--->弹球

package com.ss.fml;

import java.util.Random;
import java.util.Timer;
import java.util.TimerTask;

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Display;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnKeyListener;
import android.view.Window;
import android.view.WindowManager;

/**
* Description:
* 
site: <a href="http://www.crazyit.org">crazyit.org</a> 
* 
Copyright (C), 2001-2012, Yeeku.H.Lee
* 
This program is protected by copyright laws.
* 
Program Name:
* 
Date:
* @author  Yeeku.H.Lee kongyeeku@163.com
* @version  1.0
*/
public class PinBall extends Activity
{
        // 桌面的宽度
        private int tableWidth;
        // 桌面的高度
        private int tableHeight;
        // 球拍的垂直位置
        private int racketY;
        // 下面定义球拍的高度和宽度
        private final int RACKET_HEIGHT = 20;
        private final int RACKET_WIDTH = 70;
        // 小球的大小
        private final int BALL_SIZE = 12;
        // 小球纵向的运行速度
        private int ySpeed = 10;
        Random rand = new Random();
        // 返回一个-0.5~0.5的比率，用于控制小球的运行方向。
        private double xyRate = rand.nextDouble() - 0.5;
        // 小球横向的运行速度
        private int xSpeed = (int) (ySpeed * xyRate * 2);
        // ballX和ballY代表小球的座标
        private int ballX = rand.nextInt(200) + 20;
        private int ballY = rand.nextInt(10) + 20;
        // racketX代表球拍的水平位置
        private int racketX = rand.nextInt(200);
        // 游戏是否结束的旗标
        private boolean isLose = false;

        @Override
        public void onCreate(Bundle savedInstanceState)
        {
                super.onCreate(savedInstanceState);
                // 去掉窗口标题
                requestWindowFeature(Window.FEATURE_NO_TITLE);
                // 全屏显示
                getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                        WindowManager.LayoutParams.FLAG_FULLSCREEN);
                // 创建PlaneView组件
                final GameView gameView = new GameView(this);
                setContentView(gameView);
                // 获取窗口管理器
                WindowManager windowManager = getWindowManager();
                Display display = windowManager.getDefaultDisplay();
                // 获得屏幕宽和高
                tableWidth = display.getWidth();
                tableHeight = display.getHeight();
                racketY = tableHeight - 80;
                final Handler handler = new Handler()
                {
                        public void handleMessage(Message msg)
                        {
                                if (msg.what == 0x123)
                                {
                                        gameView.invalidate();
                                }
                        }
                };

                gameView.setOnKeyListener(new OnKeyListener()
                {
                        @Override
                        public boolean onKey(View source, int keyCode, KeyEvent event)
                        {
                                // 获取由哪个键触发的事件
                                switch (event.getKeyCode())
                                {
                                        // 控制挡板左移
                                        case KeyEvent.KEYCODE_DPAD_LEFT:
                                                if (racketX > 0)
                                                        racketX -= 10;
                                                break;
                                        // 控制挡板右移
                                        case KeyEvent.KEYCODE_DPAD_RIGHT:
                                                if (racketX < tableWidth - RACKET_WIDTH)
                                                        racketX += 10;
                                                break;
                                }
                                // 通知planeView组件重绘
                                gameView.invalidate();
                                return true;
                        }
                });
                final Timer timer = new Timer();
                timer.schedule(new TimerTask()
                {

                        @Override
                        public void run()
                        {
                                // 如果小球碰到左边边框
                                if (ballX <= 0 || ballX >= tableWidth - BALL_SIZE)
                                {
                                        xSpeed = -xSpeed;
                                }
                                // 如果小球高度超出了球拍位置，且横向不在球拍范围之内，游戏结束。
                                if (ballY >= racketY - BALL_SIZE
                                        && (ballX < racketX || ballX > racketX + RACKET_WIDTH))
                                {
                                        timer.cancel();
                                        // 设置游戏是否结束的旗标为true。
                                        isLose = true;
                                }
                                // 如果小球位于球拍之内，且到达球拍位置，小球反弹
                                else if (ballY <= 0
                                        || (ballY >= racketY - BALL_SIZE && ballX > racketX && ballX <= racketX
                                                + RACKET_WIDTH))
                                {
                                        ySpeed = -ySpeed;
                                }
                                // 小球座标增加
                                ballY += ySpeed;
                                ballX += xSpeed;
                                // 发送消息，通知系统重绘组件
                                handler.sendEmptyMessage(0x123);
                        }
                }, 0, 100);
        }

        class GameView extends View
        {
                public GameView(Context context)
                {
                        super(context);
                        setFocusable(true);
                }

                // 重写View的onDraw方法，实现绘画
                public void onDraw(Canvas canvas)
                {
                        Paint paint = new Paint();
                        paint.setStyle(Paint.Style.FILL);
                        // 如果游戏已经结束
                        if (isLose)
                        {
                                paint.setColor(Color.RED);
                                paint.setTextSize(40);
                                canvas.drawText("游戏已结束", 50, 200, paint);
                        }
                        // 如果游戏还未结束
                        else
                        {
                                // 设置颜色，并绘制小球
                                paint.setColor(Color.rgb(240, 240, 80));
                                canvas.drawCircle(ballX, ballY, BALL_SIZE, paint);
                                // 设置颜色，并绘制球拍
                                paint.setColor(Color.rgb(80, 80, 200));
                                canvas.drawRect(racketX, racketY, racketX + RACKET_WIDTH,
                                        racketY + RACKET_HEIGHT, paint);
                        }
                }
        }
}

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