问自定义TextView无法设置重力

EN

private var radius = 10.0f
private var newHeight = 0

override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec)
        val radiusInPixel = Math.round(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, radius, resources.displayMetrics))
        val diameter = 2 * radiusInPixel
        newHeight = Math.max(measuredHeight, diameter)
        setMeasuredDimension(measuredWidth + diameter + 30, newHeight)
    }

override fun onDraw(canvas: Canvas) {
    super.onDraw(canvas)

    paint.color = when (status) {
        Status.ACTIVE -> Color.GREEN
        else -> Color.TRANSPARENT
    }

    canvas.drawCircle(radius, newHeight / 2f + 3, radius, paint)
}