android自己写的类似刻度尺的东西(7)

            mSurfaceHolder.unlockCanvasAndPost(canvas);   
        } 
    } 
 
    class StaffView extends SurfaceView implements SurfaceHolder.Callback, Runnable{ 
 
        private SurfaceHolder mSurfaceHolder = null;   
        private Canvas canvas; 
        private Paint paint; 
        //画布背景 
        private Bitmap background; 
        //刻度 
        private Bitmap staff; 
        //刻度游标 
        private Bitmap pointer; 
        //初始值 
        private float initValue; 
        //刻度单位最小值 
        private float interval; 
        //单位 
        private String unit; 
        //是否初始 
        private boolean isInit = true; 
         
        public StaffView(Context context, float initValue, float interval, String unit) { 
            super(context); 
            mSurfaceHolder = this.getHolder();   
            mSurfaceHolder.addCallback(this);   
             
            paint = new Paint(); 
             
            this.setFocusable(true); 
            background = BitmapFactory.decodeResource(getResources(), R.drawable.staff_bg); 
            staff = BitmapFactory.decodeResource(getResources(), R.drawable.staff0); 
            pointer = BitmapFactory.decodeResource(getResources(), R.drawable.kedu_pointer);