Kotlin AutoCompleteTextView Adapter Item Selected 提供不同的值

问题描述

所以我在这个项目上与 Kotlin 合作，我主要使用 Java，所以我试图在 Kotlin 中找到等价物来实现相同的功能.

我从我的数据库中获取一个 JSONArray 并将其存储在名为 Congregation 的可序列化数据类中，它具有以下变量 id: Int, name: String, language: String

我现在有一个注册活动，其中有一个Congregation"输入，我决定将其设为 AutoCompleteTextView，以便我可以建议与用户输入的内容相匹配的可能值.我创建了一个自定义的 ArrayAdapter，它在显示 Congregation(下图) 的name 时工作正常>

但是，当我选择这些值之一时，它会显示列表中的完整值文本

例如如果我在输入中选择Leeds, Crossgates (English)"，它将显示 Congregation(id=1, name=Leeds, Crossgates, language=English)

我想知道如何在选择时将 Congregation 的 name 值保留在框中.

此外，当我在选择项目后尝试删除框的当前值时，我收到 IndexOutOfBoundsException Index: 1 Size: 1

自定义数组适配器 (CongregationListAdapter.kt):

class CongregationListAdapter(context: Activity, resourceId: Int, textView: Int, private var congregations: List):ArrayAdapter(context, resourceId, textView, congregations) {私有变量充气器:LayoutInflater = context.layoutInflater私有 lateinit var 视图:查看@SuppressLint("SetTextI18n")覆盖 fun getView(position: Int, convertView: View?, parent: ViewGroup): View {if (convertView == null) {视图 = inflater.inflate(R.layout.congregation_list_item, parent, false)}val 名称:TextView = view.findViewById(R.id.congregation_text)val 会众:会众?= 获取项目(位置)如果(会众！= null){name.text = congregation.name + " (" + congregation.language + ")"} 别的 {名称.文本 = ""返回视图}返回视图}覆盖乐趣 getCount(): Int {返回 congregations.size}@SuppressLint("SetTextI18n")覆盖 fun getDropDownView(position: Int, convertView: View?, parent: ViewGroup): View {if (convertView == null) {视图 = inflater.inflate(R.layout.congregation_list_item, parent, false)}val 会众:会众?= 获取项目(位置)val 名称:TextView = view.findViewById(R.id.congregation_text)如果(会众！= null){name.text = congregation.name + " (" + congregation.language + ")"} 别的 {name.text = "糟糕.有问题"}返回视图}}

自定义视图 (congregation_list_item.:

<文本视图android:id="@+id/congregation_text"android:layout_width="0dp"android:layout_height="wrap_content"android:layout_marginEnd="8dp"android:layout_marginStart="8dp"android:layout_marginTop="4dp"android:textColor="#000000"android:textSize="15sp"机器人:文本样式=正常"应用程序:layout_constraintEnd_toEndOf="父"应用程序:layout_constraintHorizo​​ntal_bias="0.0"应用程序:layout_constraintStart_toStartOf="parent"应用程序:layout_constraintTop_toTopOf="父"工具:忽略 =MissingConstraints"工具:text="Leeds, Crossgates"/></android.support.constraint.ConstraintLayout></LinearLayout>

会众模型 (Congregation.kt):

@kotlinx.serialization.Serializable数据类 Congregation(变量 ID:整数，变量名称:字符串，var 语言:字符串)

解决方案

你可以简单地在 Congregation 类中实现 toString :

@kotlinx.serialization.Serializable数据类 Congregation(变量 ID:整数，变量名称:字符串，var 语言:字符串){覆盖乐趣 toString(): String {返回 "$name ($language)";}}

So I am working with Kotlin on this project, I mainly use Java so I'm trying to find equivalents in Kotlin to achieve the same functionality.

I am getting a JSONArray from my Database and storing it in a Serializable data class called Congregation it has the following variables id: Int, name: String, language: String

I now have a registration activity in which there is a "Congregation" input, I decided to make this an AutoCompleteTextView so that I could suggest possible values matching what the users typing. I created a custom ArrayAdapter and it works fine when displaying the name of a Congregation (image below)

However, when I select one of those values, it displays the full value text from the list

e.g. If I select "Leeds, Crossgates (English)" in the input it will display Congregation(id=1, name=Leeds, Crossgates, language=English)

I am wondering how I can keep the name value of a Congregation in the box when it is selected.

Also when I try to delete the current value of the box after selecting an item I receive an IndexOutOfBoundsException Index: 1 Size: 1

Custom Array Adapter (CongregationListAdapter.kt):

class CongregationListAdapter(context: Activity, resourceId: Int, textView: Int, private var congregations: List<Congregation>)
:ArrayAdapter<Congregation>(context, resourceId, textView, congregations) {

private var inflater: LayoutInflater = context.layoutInflater
private lateinit var view: View

@SuppressLint("SetTextI18n")
override fun getView(position: Int, convertView: View?, parent: ViewGroup): View {

    if (convertView == null) {
        view = inflater.inflate(R.layout.congregation_list_item, parent, false)
    }
    val name: TextView = view.findViewById(R.id.congregation_text)

    val congregation: Congregation? = getItem(position)
    if (congregation != null) {
        name.text = congregation.name + " (" + congregation.language + ")"
    } else {
        name.text = ""
        return view
    }
    return view
}

override fun getCount(): Int {
    return congregations.size
}

@SuppressLint("SetTextI18n")
override fun getDropDownView(position: Int, convertView: View?, parent: ViewGroup): View {
    if (convertView == null) {
        view = inflater.inflate(R.layout.congregation_list_item, parent, false)
    }
    val congregation: Congregation? = getItem(position)
    val name: TextView = view.findViewById(R.id.congregation_text)
    if (congregation != null) {
        name.text = congregation.name + " (" + congregation.language + ")"
    } else {
        name.text = "Oops. There was a problem"
    }
    return view
}

}

Custom View (congregation_list_item.:

<?

Conregation Model (Congregation.kt):

@kotlinx.serialization.Serializable
data class Congregation(
    var id: Int,
    var name: String,
    var language: String
)

解决方案

You can simply implement toString in the Congregation class:

@kotlinx.serialization.Serializable
data class Congregation(
    var id: Int,
    var name: String,
    var language: String
) {
    override fun toString(): String {
        return "$name ($language)"
    }
}

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