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<LinearLayout
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="40dp">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rv_select_member"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />


    <EditText
        android:id="@+id/et_search_member"
        android:hint="搜索联系人"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:textSize="16sp"
        android:layout_gravity="center_vertical"
        android:paddingLeft="@dimen/space_tiny"
        android:textColor="@color/font_black"
        android:layout_height="match_parent" />
</LinearLayout>

在添加或删除数据后，比如

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data.add()
adapter.notifyItemInsert()

执行下面的变更布局

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// 获取layoutParams
val lp = rv_select_member.layoutParams
// 获取当前数据量
val itemCount = mSelectMemberAdapter.data.size
// 数量大于4的时候，固定宽度
if (mSelectMemberAdapter.itemCount > 4) {
    lp.width = SizeUtils.dp2px(40F)*4
}else {
    lp.width = SizeUtils.dp2px(40F)*itemCount
}
// 设置好layoutParams后，将recyclerview滚动到最后一个元素位置
rv_select_member.layoutParams = lp
rv_select_member.smoothScrollToPosition(mSelectMemberAdapter.data.lastIndex)