SurfaceView使用总结

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
            case MotionEvent.ACTION_MOVE:
                mXCross = event.getX();
                mCrossEnabled = true;
                // 重绘
                if(myThread!=null && myThread.myHandler != null) {
                    myThread.myHandler.sendEmptyMessage(0);
                }
//                Log.e("on mXCross,mYCross==",mXCross + "," + mYCross);
                break;
            case MotionEvent.ACTION_UP :
                mXCross = -1f;
                mCrossEnabled = false;
                // 重绘
                if(myThread!=null && myThread.myHandler != null) {
                    myThread.myHandler.sendEmptyMessage(0);
                }
                break;
        }
        return true;
    }

 // 线程内部类
    class MyThread extends Thread {
        private SurfaceHolder holder;
        private StockDrawWave drawWave;
        MyHandler myHandler;// 用户子线程绘制UI
        public MyThread(SurfaceHolder holder, StockDrawWave drawWave) {
            this.holder = holder;
            this.drawWave = drawWave;
        }
        class MyHandler extends Handler {
            @Override
            public void handleMessage(Message msg) {
                drawTimeChar();// 以后刷新时都直接执行绘制方法
            }
        }
        @Override
        public void run() {// 此处为初始化，第一次绘制时运行
            Looper.prepare();// Looper与Thread绑定
            myHandler = new MyHandler();// 与Looper绑定
            drawTimeChar();
            Looper.loop();// 处理消息
        }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        if (myThread != null) {
            myThread.isRun = false;
            myThread.myHandler.getLooper().quit();// 终止looper循环，让线程可以被回收
            myThread = null;
        }
    }