支持圆角的TextView

class CusRoundTextView @JvmOverloads constructor(
    context: Context,
    attrs: AttributeSet? = null,
    defStyleAttr: Int = 0
) :
    AppCompatTextView(context, attrs, defStyleAttr) {
    var rtvBorderWidth: Int = 0
    var rtvBorderColor: Int = Color.BLACK
    var rtvRadius: Float = 0f
    var rtvBgColor: Int = Color.WHITE

    init {
        val attributes = context.theme.obtainStyledAttributes(
            attrs,
            R.styleable.CusRoundTextView,
            defStyleAttr,
            0
        )
        if (attributes != null) {
            rtvBorderWidth =
                attributes.getDimensionPixelSize(R.styleable.CusRoundTextView_rtvBorderWidth, 0)
            rtvBorderColor =
                attributes.getColor(R.styleable.CusRoundTextView_rtvBorderColor, Color.BLACK)
            rtvRadius = attributes.getDimension(R.styleable.CusRoundTextView_rtvRadius, 0f)
            rtvBgColor = attributes.getColor(R.styleable.CusRoundTextView_rtvBgColor, Color.WHITE)
            attributes.recycle()
            drawBg()
        }
    }

    private fun drawBg() {
        val gd = GradientDrawable() //创建drawable
        gd.setColor(rtvBgColor)
        gd.cornerRadius = rtvRadius
        if (rtvBorderWidth > 0) {
            gd.setStroke(rtvBorderWidth, rtvBorderColor)
        }
        this.background = gd
    }



    /**
     * 设置背景色 和 圆角
     */
    fun setRoundBgColorRes(@ColorRes colorRes: Int, radius: Float = rtvRadius) {
        rtvBgColor = resources.getColor(colorRes)
        rtvRadius = radius
        drawBg()
        invalidate()
    }

    /**
     * 设置背景颜色
     * @param color
     */
    override fun setBackgroundColor(@ColorInt color: Int) {
        val myGrad = background as GradientDrawable
        myGrad.setColor(color)
    }
}

　　

    <!--支持圆角的TextView-->
    <declare-styleable name="CusRoundTextView">
        <attr name="rtvBgColor" format="color" />
        <attr name="rtvBorderWidth" format="dimension" />
        <attr name="rtvBorderColor" format="color" />
        <attr name="rtvRadius" format="dimension" />
    </declare-styleable>

　　

app:rtvBgColor="@color/white"
app:rtvRadius="10dp"