WheelPicker

The project contains a customizable WheelPicker which is more flexible than android native NumberPicker widget.

Gradle

    compile 'com.super_rabbit.wheel_picker:NumberPicker:1.0.1'

Features

• Customizable font include text size, typeface, color and alignment.
• Customizable picker item count, can be odd or even number.
• Support both positive and negative values
• Support different picker style, like limited picker, rounded wrapped picker and unlimited picker.
• Allow users to set their adapters for supportting different requirements. The video below shows an implementation of date picker by pluging custom date adapter into the wheel picker.

Attributes

attribute name	attribute description
fadingEdgeEnabled	enable/disable the fading edge attribute.
max	The max index(value) of the picker, can be negative, default is Integer.MAX_VALUE.
min	The minimum index(value) of the picker, can be negative, default is Integer.MIN_VALUE
selectedTextColor	The text color of selected item.
textColor	The text color of unselected item.
textSize	Text size.
typeface	Text font typeface.
wheelItemCount	The visible item count of the picker.
wrapSelectorWheel	true if the picker is rounded wrapped, default is false.
align	The text alignment, can be LEFT, CENTER, RIGHT.

Usage

Kotlin

// Set rounded wrap enable
numberPicker.setSelectorRoundedWrapPreferred(true)
// Set wheel item count
numberPicker.setWheelItemCount(5)
// Set wheel max index
numberPicker.setMax(1000)
// Set wheel min index
numberPicker.setMin(1000)
// Set selected text color
numberPicker.setSelectedTextColor(R.color.color_4_blue)
// Set unselected text color
numberPicker.setUnselectedTextColor(R.color.color_3_dark_blue)
// Set user defined adapter
numberPicker.setAdapter(WPDayPickerAdapter())

// OnValueChangeListener
val context = this
numberPicker.setOnValueChangeListener(object : OnValueChangeListener{
  override fun onValueChange(picker: WheelPicker, oldVal: String, newVal: String) {
    val out = String.format("Current: %s", newVal)
    Toast.makeText(context, out, Toast.LENGTH_SHORT).show()
  }
})

// Adapter sample 
/**
 * Custom wheel picker adapter for implementing a date picker
 */
class WPDayPickerAdapter : WheelAdapter {
    //get item value based on item position in wheel
    override fun getValue(position: Int): String {
        if (position == 0)
            return "Today"

        if(position == -1)
            return "Yesterday"

        if (position == 1)
            return "Tomorrow"

        val curDate = Date(System.currentTimeMillis())
        val rightNow = Calendar.getInstance()
        rightNow.time = curDate;
        rightNow.add(Calendar.DATE, position)
        
        val simpleDateFormat = SimpleDateFormat("MMM d, yyyy")
        return simpleDateFormat.format(rightNow.time)
    }

    //get item position based on item string value
    override fun getPosition(vale: String): Int {
        return 0
    }

    //return a string with the approximate longest text width, for supporting WRAP_CONTENT
    override fun getTextWithMaximumLength(): String {
        return "Mmm 00, 0000"
    }

    //return the maximum index
    override fun getMaxIndex(): Int {
        return Integer.MAX_VALUE
    }

    //return the minimum index
    override fun getMinIndex(): Int {
        return Integer.MIN_VALUE
    }
}

Demos