使用RecyclerView时未显示BottomSheet

Question

我有以下底部代码

xml文件

<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/titleTextview"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="16dp"
        android:fontFamily="sans-serif"
        android:text="@string/choose_option"
        android:textColor="@android:color/darker_gray"
        android:textSize="14sp"
        android:textStyle="normal"
        app:layout_constraintBottom_toTopOf="@id/recyclerView"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="8dp"
        android:layout_marginBottom="8dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@id/titleTextview" />

</androidx.constraintlayout.widget.ConstraintLayout>

视图

class AttributeOptionsBottomSheet(val viewModel: AttributeOptionsViewModel) : BottomSheetDialogFragment() {

    override fun getTheme(): Int = R.style.AppBottomSheetDialogTheme

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? = inflater.inflate(R.layout.bottom_sheet_attributes, container, false)
        .also { view ->
            view.findViewById<RecyclerView>(R.id.recyclerView).apply {
                context?.let {
                    layoutManager = LinearLayoutManager(Activity())
                    adapter = AttributeOptionsAdapter(viewModel)
                    viewModel.dismissView.observe({ lifecycle }) {
                        dismiss()
                    }
                }
            }
        }
}

查看模型

class AttributeOptionsViewModel(attributeId: Int) : BaseViewModel() {

    val optionsDao: ExtraAttributeOptionDao by inject()
    var options : List<ExtraAttributeOptionEntity> = ArrayList<ExtraAttributeOptionEntity>()
    val dismissView = LiveEvent<Unit>()
    var optionSelected = LiveEvent<ExtraAttributeOptionEntity>()

    init {
        getOptions(attributeId)
    }

    fun getOptionName(position: Int): String {
        return options[position].name
    }

    fun setSelectedOption(position: Int) {
        options[position].apply {
            optionSelected.postValue(this)
            dismissView.postValue(Unit)
        }
    }

    fun getOptions(attributeId: Int) {
        launch(Dispatchers.IO) {
            options = optionsDao.getExtraAttributeOptionsBuAttributeId(attributeId)
        }
    }
}

我的问题是当有少量商品时显示底部工作表，并且它没有显示大量商品，屏幕只是变暗而且没有发生任何事情

Answer 1

因为我还没有使用它之前我不确定这是唯一的解决方案。

将你的RecyclerView身高改为wrap_content

并将下一行添加到TextView

app:layout_constraintVertical_bias="0"
app:layout_constraintVertical_chainStyle="packed"

或者从bottom constraint中移除TextView并将相同的bias添加到RecyclerView

它对我有用。