// 圆角矩形
                RectF rectf = new RectF(topPlaceX, topPlaceY, bottomPlaceX,
                        bottomPlaceY);
                float roundPx = sizeY / 2;
                canvas.drawRoundRect(rectf, roundPx, roundPx, paint);    
//文字
                Paint textpaint = new Paint();
                /* 去锯齿 */
                textpaint.setAntiAlias(true);
                textpaint.setColor(Color.parseColor("#000000"));
                textpaint.setTextSize(16);
//x坐标居中
                textpaint.setTextAlign(Paint.Align.CENTER);
                canvas.drawText("show", bottomPlaceX
                        - sizeX / 2, bottomPlaceY
                        - "sizeY/ 3, textpaint);