android - 如何在 Android Spinner 中仅显示 3 个字符？

Question

我正在开发一个 android 项目，我在工作日制作了一个 Spinner，现在我只想显示在 Spinner 中选择的任何一天的缩写(星期一、星期二、星期三等)，但全名下拉列表中的天数(星期一、星期二、星期三等)。我应该怎么做？我已经用默认的 xml 布局制作了最简单的 Spinner。

Answer 1

注意:这可能无法编译它只是一个“伪”给你一个方法的想法。

您创建一个普通的 Spinner(您也可以创建一个 CustomView，然后将逻辑放在那里，但我会选择最快的那个)

<androidx.appcompat.widget.AppCompatSpinner
        android:id="@+id/spinner"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        />

您可以创建一个string-array，日期为

<string-array name="Weekdays"> 
        <item>Monday</item> 
        <item>Tuesday</item> 
        <item>Wednesday</item> 
        <item>Thursday </item> 
        <item>Friday</item> 
        <item>Saturday</item> 
        <item>Sunday</item> 
</string-array> 

<string-array name="WeekdaysAbbreviations">
        <item>Mon</item>
        <item>Tue</item>
        <item>Wed</item>
        <item>Thu</item>
        <item>Fri</item>
        <item>Sat</item>
        <item>Sun</item>
    </string-array>

然后得到工作日如下

val weekdays = resources.getStringArray(R.array.Weekdays)

然后测试将是:

        val weekDays = resources.getStringArray(R.array.Weekdays)
        val abbreviationWeekDays = resources.getStringArray(R.array.WeekdaysAbbreviations)
        //find the spinner
        val spinner = findViewById<AppCompatSpinner>(R.id.spinner)
        //create an adapter with the weekdays
        val adapter = ArrayAdapter(this, android.R.layout.simple_spinner_item, weekDays)
        //set the adapter
        spinner.adapter = adapter
        spinner.onItemSelectedListener = object :
            AdapterView.OnItemSelectedListener {
            override fun onItemSelected(
                parent: AdapterView<*>,
                view: View, position: Int, id: Long
            ) {
                //find the first TextView of the Adapter
                val selectedText = parent.getChildAt(FIRST_POSITION) as TextView
                //As the abbreviationWeekDays and WeekDays have the same size, you can get the position selected on weebDays and then print what you have on abbreviationdays
                //Another option would be selectedText.text = weekDays[position].substring(0,4)
                selectedText.text = abbreviationWeekDays[position]
            }

            override fun onNothingSelected(parent: AdapterView<*>) {
                //Nothing selected \o/
            }
        }

输出:

我还创建了一个 Sample repository on my Github account