SurfaceView有关

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慕课网的例子抽奖转盘，github仓库有代码

public class SurfaceView_example extends SurfaceView implements Callback, Runnable {   private SurfaceHolder mHolder;   /**    * 与SurfaceHolder绑定的Canvas    */   private Canvas mCanvas;   /**    * 用于绘制的线程    */   private Thread t;   /**    * 线程的控制开关    */   private boolean isRunning;      public SurfaceView_example(Context context) {      super(context,null);      // TODO Auto-generated constructor stub   }   public SurfaceView_example(Context context, AttributeSet attrs) {      super(context, attrs);            mHolder = getHolder();      mHolder.addCallback(this);            //设置可获取焦点      setFocusable(true);      setFocusableInTouchMode(true);            //设置常量      this.setKeepScreenOn(true);         }   @Override   public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {      // TODO Auto-generated method stub         }   @Override   public void surfaceCreated(SurfaceHolder holder) {            isRunning = true;      t = new Thread(this);      t.start();   }   @Override   public void surfaceDestroyed(SurfaceHolder arg0) {            isRunning = false;         }   @Override   public void run() {            while(isRunning){                  darw();      }         }   private void darw() {            try {         mCanvas = mHolder.lockCanvas();         if(mCanvas != null){            //drawing         }      } catch (Exception e) {      }      finally{                  if(mCanvas != null){            mHolder.unlockCanvasAndPost(mCanvas);         }      }   }}

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