如何在 Recycler View 为空时显示 TextView？

Question

我想在我的 RecyclerView 为空时显示一个 textView。我准备了这个功能，但它不起作用。我相信我应该从 RecyclerView 获取列表，但我真的不知道如何获取。我在碎片中。

XML:

<androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recycler_view_list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:visibility="visible"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:listitem="@layout/item_list" />

 <TextView
        android:id="@+id/tv_no_records"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:text="@string/nothing_to_display"
        android:textSize="16sp"
        android:visibility="gone" />

片段：

private fun displayList() {

    val list = listOf<Shoe>()
    if (list.isEmpty()) {
        binding.recyclerViewList.visibility = View.VISIBLE
        binding.tvNoRecords.visibility = View.GONE
    } else {
        binding.recyclerViewList.visibility = View.GONE
        binding.tvNoRecords.visibility = View.VISIBLE
    }
}

添加鞋子（在 ViewModel 中）：

fun addShoe(shoe: Shoe) {
        viewModelScope.launch(Dispatchers.IO) {
            repository.addShoes(shoe)
        }
    }

非常感谢，安娜

Answer 1

条件颠倒了。当列表为空时，您将显示 recyclerView，反之亦然。只需使用不检查。考虑以下：

private fun displayList() {

    val list = listOf<Shoe>()
    if (list.isNotEmpty()) {
        binding.recyclerViewList.visibility = View.VISIBLE
        binding.tvNoRecords.visibility = View.GONE
    } else {
        binding.recyclerViewList.visibility = View.GONE
        binding.tvNoRecords.visibility = View.VISIBLE
    }
}

如何在 Recycler View 为空时显示 TextView？

How to display a TextView when Recycler View is empty?

kotlin

android-recyclerview