第十集：弹球

1.画小球，和上集的水波一样

class GameView extends SurfaceView implements Callback, Runnable {        private Paint paint = null;        private Path path; // 画自定义图形        private SurfaceHolder sh = null;        public GameView(Context context) {            super(context);            paint = new Paint();            paint.setColor(Color.RED);            // 设置画笔类型            paint.setStyle(Style.STROKE);            path = new Path();            sh = this.getHolder();            // 注册一个监听，就是在View改变的时候执行是调用。            sh.addCallback(this);        }        @Override        public void surfaceDestroyed(SurfaceHolder holder) {            // 销毁的时候执行内容        }        @Override        public boolean onTouchEvent(MotionEvent event) {            switch (event.getAction()) {            case MotionEvent.ACTION_DOWN:                // 按下的瞬间                if (list.size() < 10) {                    list.add(new Ball(event.getX(), event.getY(), 5));                }                break;            case MotionEvent.ACTION_MOVE:                // 移动                break;            default:                break;            }            invalidate();            // 不把事件传递给父窗体            return true;        }        @Override        public void surfaceCreated(SurfaceHolder holder) {            // 创建时候执行            new Thread(this).start();        }        class Ball {            public Ball(float x, float y, int r) {                this.x = x;                this.y = y;                this.r = r;                paint = new Paint();                paint.setColor(Color.RED);                paint.setStyle(Style.FILL_AND_STROKE);// 填充和画边。                paint.setStrokeWidth(5);                speedx = new Random().nextInt(3);                speedy = new Random().nextInt(3);            }            float x = 0;            float y = 0;            int r = 0;            int speedx = 0;            int speedy = 0;            Paint paint;// 这个用来画球自己            public void move() {                x = x + speedx;                y = y + speedy;            }            public void drawCicle(Canvas canvas) {                canvas.drawCircle(x, y, r, paint);            }        }        List
     
       list = new ArrayList
      
       ();        private void drawView() {            Canvas canvas = sh.lockCanvas();            // 刷背景，原来的图像就擦出了。            canvas.drawColor(Color.BLACK);            canvas.drawPath(path, paint);            for (Ball b : list) {                b.drawCicle(canvas);            }            sh.unlockCanvasAndPost(canvas);        }        @Override        public void surfaceChanged(SurfaceHolder holder, int format, int width,                int height) {            // 修改的时候执行        }        @Override        protected void onDraw(final Canvas canvas) {            super.onDraw(canvas);        }        @Override        public void run() {            while (true) {                drawView();                for (Ball b : list) {                    b.move();                }                try {                    Thread.sleep(100);                } catch (InterruptedException e) {                    e.printStackTrace();                }            }        }    }
      
     

 

2.全屏

在AndroidMainifest.xml 中的<application><activity 中

android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"

3.让小球无规律拖动

　　public void move() {                x = x + new Random().nextInt(6)-3;                y = y + new Random().nextInt(6)-3;   }

4.加入声音

在res下新建文件夹raw，将音频文件放入。放入a.mp3

private MediaPlayer mediaPlayer = null;mediaPlayer = MediaPlayer.create(context, R.raw.a);mediaPlayer.start();//sleep();mediaPlayer.stop();

 

第十集完