I’ve been trying to create a custom CardView with a title and below the title any type of content, but when I try overriding addView in the Kotlin class of the custom element to redirect the child it doesn’t allow it. Does anyone have any solution? Here is the code:

XML:

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="8dp">

    <TextView
        android:id="@+id/title"
        style="@style/TextView.Title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        tools:text="Título de ejemplo" />

    <FrameLayout
        android:id="@+id/childrenContainer"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

KOTLIN:
class TarjetaTitle @JvmOverloads constructor(
context: Context,
attrs: AttributeSet? = null,
defStyleAttr: Int = 0
) : CardView(context, attrs, defStyleAttr) {

private var title: TextView
private var childrenContainer: FrameLayout

init {
    LayoutInflater.from(context).inflate(R.layout.element_tarjeta_title, this, true)

    title = findViewById(R.id.title)
    childrenContainer = findViewById(R.id.childrenContainer)

    context.obtainStyledAttributes(attrs, R.styleable.TarjetaTitle, defStyleAttr, 0).apply {
        try {
            title.text = getString(R.styleable.TarjetaTitle_title)
            val titleStyle = getResourceId(R.styleable.TarjetaTitle_titleStyle, -1)

            if (titleStyle != -1)
                title.setTextAppearance(titleStyle)

        } finally {
            recycle()
        }
    }
}

override fun addView(child: View?, params: LayoutParams?) {
    childrenContainer.addView(child, params)
}

}