设置 AppCompatAutoCompleteTextView 下拉宽度和边距

Question

我有以下 AppCompatAutoCompleteTextView -

<androidx.appcompat.widget.AppCompatAutoCompleteTextView
            android:id="@+id/phoneNumberPrefixTextView"
            style="@style/PrimaryEditText"
            android:layout_width="match_parent"
            android:layout_height="@dimen/credit_card_form_height"
            android:gravity="center"
            android:dropDownWidth="match_parent"
            android:inputType="number"
            android:maxLength="3" />

使用以下列表项 XML -

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
    android:paddingHorizontal="@dimen/padding_16">

    <androidx.appcompat.widget.AppCompatTextView
        android:id="@+id/country_edit_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginHorizontal="@dimen/padding_16"
        android:layout_marginVertical="@dimen/padding_16"
        android:fontFamily="@font/montserrat_regular"
        android:textColor="@color/light_black"
        android:textSize="@dimen/text_size_normal"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:text="Israel" />

    <androidx.appcompat.widget.AppCompatTextView
        android:id="@+id/country_code_edit_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginHorizontal="@dimen/padding_4"
        android:fontFamily="@font/montserrat_regular"
        android:textColor="@color/fog_medium"
        android:textSize="@dimen/text_size_normal"
        app:layout_constraintBottom_toBottomOf="@+id/country_edit_text"
        app:layout_constraintStart_toEndOf="@+id/country_edit_text"
        app:layout_constraintTop_toTopOf="@+id/country_edit_text"
        tools:text="+972" />


</androidx.constraintlayout.widget.ConstraintLayout>

以及以下 ArrayAdapter -

class CountriesWithCodeAdapter(
    context: Context,
    resource: Int,
    private val items: MutableList<Countries.Country>
) : ArrayAdapter<Countries.Country>(context, resource, items) {

    private val originalList: List<Countries.Country> = items.toList()
    private var filteredItems: List<Countries.Country> = items.toList()

    override fun getItem(position: Int): Countries.Country {
        return items[position]
    }

    override fun getView(position: Int, convertView: View?, parent: ViewGroup): View {
        val binding: CreditCardCountryWithCodeItemBinding =
            if (convertView != null) {
                CreditCardCountryWithCodeItemBinding.bind(convertView)
            } else {
                CreditCardCountryWithCodeItemBinding.inflate(
                    LayoutInflater.from(context),
                    parent, false
                )
            }
        binding.countryEditText.text = items[position].name
        binding.countryCodeEditText.text = items[position].callingCode
        return binding.root
    }

    override fun getFilter(): Filter = object : Filter() {
        override fun performFiltering(constraint: CharSequence?): FilterResults {
            val charString = constraint.toString().lowercase(Locale.getDefault()).trim()

            filteredItems = if (charString.isEmpty()) {
                originalList.toList()
            } else {
                originalList.filter { country ->
                    country.callingCode.contains(charString, ignoreCase = true)
                }
            }

            val filterResults = FilterResults()
            filterResults.values = filteredItems
            return filterResults
        }

        override fun publishResults(constraint: CharSequence?, results: FilterResults?) {
            @Suppress("UNCHECKED_CAST")
            filteredItems = results?.values as? List<Countries.Country> ?: emptyList()
            if (filteredItems.isEmpty()) {
                clear()
                notifyDataSetChanged()
            } else {
                clear()
                addAll(filteredItems)
                notifyDataSetChanged()
            }
        }
    }
}

我正在尝试实现一种在下拉项中引入填充的行为。我在设置

android:dropDownWidth="match_parent"

的同时添加了列表项填充到根父级，但它似乎实际上没有做任何事情。我错过了什么？

Answer 1

假设您正在尝试在自动完成文本视图上实现水平边距，您可以尝试为自动完成文本视图创建单独的布局，并将其包含在父布局中，如下所示，这将在自动完成文本视图上设置 16 的水平填充/边距： -

父级布局

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginHorizontal="16dp"
    tools:context=".messageCenter.MessageCenterFragment">
    <include
        android:id="@+id/ilAutoCompleteTextView"
        layout="@layout/autocomplete_textview"/>

</androidx.constraintlayout.widget.ConstraintLayout>

子布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="16dp"
    android:paddingLeft="16dp"
    android:paddingRight="16dp"
    android:paddingTop="16dp">

    <AutoCompleteTextView
        android:id="@+id/autoCompleteTextView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#000"
        android:hint="Enter Your Name Here"
        android:padding="15dp"
        android:textColorHint="#fff"
        android:textStyle="bold|italic" />
</RelativeLayout>

现在是你的代码：-

val fruits = arrayOf("Apple", "Banana", "Cherry", "Date", "Grape", "Kiwi", "Mango", "Pear")

        val adapter = ArrayAdapter(requireContext(), R.layout.select_dialog_item, fruits)
        //Getting the instance of AutoCompleteTextView
        val actv = binding.ilAutoCompleteTextView.autoCompleteTextView
        actv.threshold = 1 //will start working from first character
        actv.setAdapter(adapter) //setting the adapter data into the AutoCompleteTextView
        actv.setTextColor(Color.RED)