android获取目前Canvas位图代码

//获取位图代码public Bitmap getCanvasBmp()  {    int w = CDisplay.getCurScreenWid();    int h = CDisplay.getCurScreenHei();    Bitmap canvasBmp = Bitmap.createBitmap( w, h, Config.ARGB_8888 );    Canvas cn = new Canvas(canvasBmp);    doDraw(cn);       cn.save(Canvas.ALL_SAVE_FLAG);    cn.restore();    return canvasBmp;}