Paint的設置方法
setAntiAlias:這是畫筆的鋸齒效
setColor
setARGB
setAlpha
setTextSize
setStyle
setStrokeWidth
getColor
getAlpha
Canvas繪制常見圖形的方法
1,繪制直線
左上角是0.0點
drawLine(float startX,float startY,float stopX,float stopY,Paint paint)
2,繪制矩形
drawRect(float left,float top,float right,float bottom,Paint paint)
3,繪制圓形
drawCircle(float cx,float cy,float radius,Paint paint)