第七天android：弹球1

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<Ball> list = new ArrayList<Ball>();

        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