如何更改Spinner小部件的默认选择样式

Question

“ Light Theme”样式是我想要更改为看起来像其余小部件的样式

这是我的微调代码

  <Spinner
      android:id="@+id/ui_mode"
      style="@style/GenericText.SettingsSubtext"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:prompt="@string/amount"
      android:entries="@array/ui_mode"
      tools:listitem="@layout/spinner_popup_item" />

Answer 1

无法直接从XML更改Spinner样式。但是，您可以实现一个类来实现。在我的实现中，当您单击微调器时，我需要一些时间来增加一些效果。

微调器类

class MySpinner : AppCompatAutoCompleteTextView, AdapterView.OnItemClickListener {

    companion object {
        private const val MAX_CLICK_DURATION = 200
    }

    private var startClickTime: Long = 0
    private var isPopup: Boolean = false
    private var mPosition = ListView.INVALID_POSITION

    constructor(context: Context?, attributeSet: AttributeSet?, defStyleAttr: Int) : super(
        context,
        attributeSet,
        defStyleAttr
    )

    constructor(context: Context?, attributeSet: AttributeSet?) : super(context, attributeSet)
    constructor(context: Context?) : super(context)

    init {
        onItemClickListener = this
    }

    override fun enoughToFilter(): Boolean = true

    override fun onFocusChanged(focused: Boolean, direction: Int, previouslyFocusedRect: Rect?) {
        super.onFocusChanged(focused, direction, previouslyFocusedRect)
        if (focused) {
            performFiltering("", 0)
            val imm = context.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
            imm.hideSoftInputFromWindow(windowToken, 0)
            keyListener = null
            dismissDropDown()
        } else {
            isPopup = false
        }
    }

    @SuppressLint("ClickableViewAccessibility")
    override fun onTouchEvent(event: MotionEvent): Boolean {
        if (!isEnabled)
            return false

        when (event.action) {
            MotionEvent.ACTION_DOWN -> {
                startClickTime = Calendar.getInstance().timeInMillis
                super.performClick()
            }
            MotionEvent.ACTION_UP -> {
                val clickDuration = Calendar.getInstance().timeInMillis - startClickTime
                if (clickDuration < MAX_CLICK_DURATION) {
                    isPopup = if (isPopup) {
                        dismissDropDown()
                        false
                    } else {
                        requestFocus()
                        showDropDown()
                        true
                    }
                }
            }
        }

        return super.onTouchEvent(event)
    }

    override fun onItemClick(adapterView: AdapterView<*>, view: View, position: Int, id: Long) {
        mPosition = position
        isPopup = false
    }

    override fun setCompoundDrawablesWithIntrinsicBounds(
        left: Drawable?,
        top: Drawable?,
        right: Drawable?,
        bottom: Drawable?
    ) {
        var rightInline = right
        val dropdownIcon = ContextCompat.getDrawable(context, R.drawable.ic_baseline_arrow_drop_down_24dp)

        if (dropdownIcon != null) {
            val value = TypedValue()
            context!!.theme.resolveAttribute(R.attr.colorAccent, value, true)
            rightInline = dropdownIcon
            rightInline.setColorFilter(value.data, PorterDuff.Mode.SRC_ATOP)
        }
        super.setCompoundDrawablesWithIntrinsicBounds(left, top, rightInline, bottom)
    }

    fun getPosition(): Int = mPosition

    fun setPositionAndText(position: Int, text: String) {
        mPosition = position
        setText(text)
    }
}

和您的XML

  <com.yourpackages.MySpinner
      android:id="@+id/ui_mode"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:prompt="@string/amount"
      android:entries="@array/ui_mode"/>