本文共 5203 字，大约阅读时间需要 17 分钟。

public class MainActivity extends Activity {    //随机数。每次进入游戏初始不一样    Random rand = new Random();    private double xyRate = rand.nextDouble() - 0.5; //一个-0.5~0.5的比率,控制小球的方向    //屏幕宽，高    private int tablewidth;    private int tableheight;    //球拍的水平位置，垂直位置，宽度，高度    private int racketx = rand.nextInt(200);//***每次进入游戏得到随机球拍初始位置    private int rackety ;    private int RACKET_WIDTH = 200;    private int RACKET_HEIGHT = 30;    //球的大小，x和Y坐标    private int BALL_SIZE = 16;    private int ballx = rand.nextInt(200) + 20;//***每次进入游戏得到随机小球初始位置    private int bally = rand.nextInt(10) + 20;//***    //球的纵向速度,横向速度    private int yspeed = 40;    private int xspped = (int) (yspeed*xyRate*2); //***每次进入游戏得到一个随机的横向速度    //游戏是否结束的标志    private boolean isLose = false;    //球拍的旧xy坐标    int oldx;    int oldy;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        final GameView gameView = new GameView(this);        setContentView(gameView);        //requestWindowFeature(Window.FEATURE_NO_TITLE);//因为已经没有标题了，加上该代码会出错        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN , WindowManager.LayoutParams.FLAG_FULLSCREEN);        WindowManager windowManager = getWindowManager();        Display display = windowManager.getDefaultDisplay();        DisplayMetrics metrics = new DisplayMetrics();        display.getMetrics(metrics);        tablewidth = metrics.widthPixels;        tableheight = metrics.heightPixels;        Log.i("mydate" , tablewidth +"  " + tableheight);        rackety = tableheight - 80;        final Handler handler = new Handler(){            @Override            public void handleMessage(Message msg) {                if (msg.what == 1){                    gameView.invalidate();                }            }        };        gameView.setOnKeyListener(new View.OnKeyListener() { //按键            @Override            public boolean onKey(View v, int keyCode, KeyEvent event) {                switch (event.getKeyCode()){                    case KeyEvent.KEYCODE_A:                        if (racketx > 0) racketx -= 10;                        break;                    case KeyEvent.KEYCODE_D:                        if (racketx < tablewidth - RACKET_WIDTH) racketx += 10;                        break;                }                gameView.invalidate();//控制球拍左右移动                return true;            }        });        gameView.setOnTouchListener(new View.OnTouchListener() { //触摸            @Override            public boolean onTouch(View v, MotionEvent event) {                int nowx = (int) event.getX();                //int nowy = (int) event.getY();                switch (event.getAction()){                    case MotionEvent.ACTION_DOWN:                        oldx = nowx;                        //oldy = nowy;                        break;                    case MotionEvent.ACTION_MOVE:                        if (nowx > oldx){ //向右移动                            racketx += 10;                        } else if (nowx < oldx) {//向左移动                            racketx -= 10;                        }                        oldx = nowx;                        break;                    case MotionEvent.ACTION_UP:                        oldx = nowx;                        break;                }                gameView.invalidate();                return true;            }        });        final Timer timer = new Timer();        timer.schedule(new TimerTask() {            @Override            public void run() {                //小球碰到游戏界面左右边框时                if (ballx <= 0 || ballx >= tablewidth - BALL_SIZE){                    xspped = -xspped; //横向速度反向                }                //如果小球的高度超出了球拍的位置，且横向不在球拍的范围内，则GAME OVER                if (bally >= rackety - BALL_SIZE && (ballx < racketx || ballx > racketx+RACKET_WIDTH)){                    timer.cancel();                    isLose = true; //游戏结束标志                } //如果小球在拍的范围内或碰到顶部，小球反弹                else if (bally <= 0 || (bally >= rackety-BALL_SIZE && ballx > racketx && ballx < racketx + RACKET_WIDTH)){                    yspeed = -yspeed; //纵向速度反向                }                //小球坐标不停的改变                bally += yspeed;                ballx += xspped;                handler.sendEmptyMessage(1);            }        } , 0 , 100); //每0.1秒执行刷新    }    class GameView extends View{        Paint paint = new Paint();        public GameView(Context context) {            super(context);            setFocusable(true);        }        @Override        protected void onDraw(Canvas canvas) {            super.onDraw(canvas);            paint.setStyle(Paint.Style.FILL);            paint.setAntiAlias(true);            if (isLose){                paint.setColor(Color.RED);                paint.setTextSize(40);                canvas.drawText("GAME OVER" , tablewidth/2-100 , 200 , paint);            } else {                paint.setColor(Color.BLACK);                canvas.drawCircle(ballx , bally , BALL_SIZE , paint); //绘制小球                canvas.drawRect(racketx , rackety , racketx + RACKET_WIDTH , rackety + RACKET_HEIGHT , paint);//绘制球拍            }        }    }}

转载地址：https://liuyan.blog.csdn.net/article/details/80035062 如侵犯您的版权，请留言回复原文章的地址，我们会给您删除此文章，给您带来不便请您谅解！