Nublo

class DateEditText : AppCompatEditText(context, attrs, defStyleAttr) {
   private var canChange: Boolean = false
   private var actualText: StringBuilder = StringBuilder()

   override fun onSelectionChanged(selStart: Int, selEnd: Int) {
       super.onSelectionChanged(selStart, selEnd)
       if (!canChange) return
       canChange = false
       setSelection(actualText.length)
       canChange = true

Nublo

override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {
   if (edited) {
       edited = false
       return
   }
   var working = getEditText()
   working = manageDateDivider(working, 2, start, before)
   working = manageDateDivider(working, 5, start, before)
   edited = true
   input.setText(working)

Nublo

class DigitsTrimStartFilter(private val max: Int) : InputFilter {
   override fun filter(...): CharSequence? {
       val s = source.subSequence(start, end).filter { it.isDigit() }
       val keep = max - (dest.length - (dend - dstart))
       return when {
           keep <= 0 -> ""
           keep >= s.length -> null // keep original
           else -> s.subSequence(s.length - keep, s.length)
       }
   }

Nublo

phoneNumber.setOnFocusChangeListener { _, hasFocus ->
    countryCode.setBackgroundResource(background(hasFocus))
}

private fun background(hasFocus: Boolean) =
    when (hasFocus) {
        true -> R.drawable.phone_input_active
        false -> R.drawable.phone_input_inactive
    }

Nublo

<merge xmlns:android="http://schemas.android.com/apk/res/android"
   tools:parentTag="android.widget.LinearLayout">
   <TextView
       android:id="@+id/country_code" />
   <EditText
       android:id="@+id/phone_number" />
</merge>

Nublo

fun getBackground(goal: GoalInProgress) =
  when (goal.progress) {
    in 0.0..0.5 -> R.drawable.ic_not_filled
    in 0.5..0.99 -> R.drawable.ic_half_filled
    else -> R.drawable.ic_full_filled
}

Nublo

data class GoalInProgress(val progress: Float)

private val unchargedPaint = Paint().apply {
   xfermode = PorterDuffXfermode(PorterDuff.Mode.MULTIPLY)
}

private fun mixChargedAndUncharged(canvas: Canvas) {
   drawFullyCharged(canvas)
   drawUnchargedPart(canvas)
}

Nublo

maxSum xs = maximum $ zipWith (+) xs (tail xs)

Nublo

fun maxSum(xs: List<Int>) = zipWith(xs, xs.tail, {a, b -> a + b}).max()

Nublo

public Integer maxSum(List<Integer> array) {
   Integer max = array.get(0) + array.get(1);
   for (int i = 2; i < array.size(); i++)
       if (array.get(i) + array.get(i-1) > max)
           max = array.get(i) + array.get(i-1);
   return max;
}