android开发使用clipPath快速实现ImageView圆角

class RoundImageView @JvmOverloads constructor(
    context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
) : AppCompatImageView(context, attrs, defStyleAttr) {

    private val mRadius = 10f
    private val mRoundedRectPath = Path()
    private var width = 0f
    private var height = 0f
    private var isClip = false

    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec)
        width = measuredWidth * 1.0f
        height = measuredHeight * 1.0f
    }

    override fun onDraw(canvas: Canvas) {
        if (!isClip) {
            isClip = true
            mRoundedRectPath.reset()
            mRoundedRectPath.moveTo(mRadius, 0f)
            mRoundedRectPath.lineTo(width - mRadius, 0f)
            mRoundedRectPath.quadTo(width, 0f, width, mRadius)
            mRoundedRectPath.lineTo(width, height)
            mRoundedRectPath.lineTo(0f, height)
            mRoundedRectPath.lineTo(0f, mRadius)
            mRoundedRectPath.quadTo(0f, 0f, mRadius, 0f)
        }
        try {
            canvas.clipPath(mRoundedRectPath)
            super.onDraw(canvas)
        } catch (e: Throwable) {
            e.printStackTrace()
        }
    }
}