ch4vi

sealed class Result<T> {
    data class Success<T>(val value: T) : Result<T>()
    data class Failure<T>(val message: String? = null) : Result<T>()

    val isSuccess get() = this is Success
    val isFailure get() = this is Failure

    fun <T> success(v: T) = Success(v)
    fun <T> failure(m: String? = null) = Failure<T>(m)

ch4vi

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.example_layout)
   
    if (savedInstanceState == null) {
      viewPager.adapter = PagerAdapter(supportFragmentManager)
      dotsIndicator.setViewPager(viewPager)
    }
  }

ch4vi

import android.content.Context
import android.database.DataSetObserver
import android.graphics.Color
import android.graphics.drawable.GradientDrawable
import android.support.v4.view.ViewPager
import android.util.AttributeSet
import android.util.Log
import android.view.LayoutInflater
import android.widget.FrameLayout

ch4vi

fun <T, R> LiveData<T>.then(callback: (T) -> LiveData<R>): LiveData<R> {
  return Transformations.switchMap(this, {
    result(it)
  })
}

ch4vi

import android.text.SpannableStringBuilder
import android.text.Spanned.SPAN_INCLUSIVE_EXCLUSIVE
import java.util.*

/** A [SpannableStringBuilder] wrapper whose API doesn't make me want to stab my eyes out.  */
class KTruss {
    private val builder: SpannableStringBuilder = SpannableStringBuilder()
    private val stack: Deque<Span> = ArrayDeque<Span>()

    fun append(string: String): KTruss {