在customview中的特定视图组中添加视图

Question

我正在尝试创建一个自定义视图组，以使子级进入特定的布局。我试图覆盖addview方法，但是遇到了几个不同的错误。我的布局和相应的代码如下。因此，请问如何在llContent（LinearLayout）下添加视图。

因此，在创建布局后，我需要在xml的llContent下添加任何视图或addView方法。

<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <androidx.constraintlayout.widget.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="20dp">

            <TextView
                android:id="@+id/txtError"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="@drawable/rounded_negative"
                android:gravity="center_horizontal"
                android:paddingBottom="10dp"
                android:textColor="@color/white"
                android:translationY="60dp"
                app:layout_constraintBottom_toTopOf="@+id/clContent"
                tools:text="error" />

            <com.github.florent37.shapeofview.shapes.RoundRectView
                android:id="@+id/clContent"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                app:layout_constraintTop_toBottomOf="@+id/txtError"
                app:shape_roundRect_borderColor="@color/borderColor"
                app:shape_roundRect_borderWidth="@dimen/borderWidth"
                app:shape_roundRect_bottomLeftRadius="@dimen/borderRadius"
                app:shape_roundRect_bottomRightRadius="@dimen/borderRadius"
                app:shape_roundRect_topLeftRadius="@dimen/borderRadius"
                app:shape_roundRect_topRightRadius="@dimen/borderRadius">

                <FrameLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:background="@color/white" />

                **<LinearLayout
                    android:id="@+id/llContent"
                    android:layout_width="match_parent"
                    android:layout_height="100dp"
                    android:orientation="vertical">

                </LinearLayout>**
            </com.github.florent37.shapeofview.shapes.RoundRectView>
        </androidx.constraintlayout.widget.ConstraintLayout>
    </FrameLayout>
</merge>


class CustomView: FrameLayout {

    constructor(context: Context, attrs: AttributeSet) : super(context, attrs) { init(attrs)}

    constructor(context: Context, attrs: AttributeSet, defStyleAttr: Int) : super(context, attrs, defStyleAttr) { init(attrs)}

    private fun init(attrs: AttributeSet) {
        LayoutInflater.from(context).inflate(R.layout.custom_view, this, true)
        parseAttributes(attrs)
    }

    private fun parseAttributes(attrs: AttributeSet) {
        /*
        TODO
        val values = context.obtainStyledAttributes(attrs, R.styleable.CustomView)

        values.recycle()
        */
    }


    override fun addView(child: View?, index: Int) {
        if (child == null) {
            throw IllegalArgumentException("Cannot add a null child view to a ViewGroup")
        }
        var params: FrameLayout.LayoutParams? = child.layoutParams as LayoutParams
        if (params == null) {
            params = generateDefaultLayoutParams()
            if (params == null) {
                throw IllegalArgumentException("generateDefaultLayoutParams() cannot return null")
            }
        }
        addView(child, index, params)
    }