Android5.0后，任何View 可以设置圆角的方法ViewOutlineProvider记录

textView?.outlineProvider = object : ViewOutlineProvider() {
    override fun getOutline(view: View?, outline: Outline?) {
        outline?.setRoundRect(0, 0, view?.width?:0, view?.height?:0,30f)
    }
}
textView?.clipToOutline = true

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