建议背景绘制也加上抗锯齿！

[mr-wind]

private void drawBackground(Canvas canvas) {
mPaint.setColor(mCurrentColor);
mPaint.setAntiAlias(true);//背景绘制抗锯齿
mPaint.setStyle(Paint.Style.FILL);
canvas.drawPath(mBackgroundPath, mPaint);
mPaint.reset();
}