abdurahmanadilovic

async(parentJob + UI) {
        val task = async(parentJob + CommonPool) {
            RestClient.apiDefinition.listPosts().execute()
        }

        val result = task.await()
        val numberOfPosts = "number of posts ${result.body()?.size}"
        numberOfPostsTextView.text = numberOfPosts

    }.invokeOnCompletion { it: Throwable? ->

abdurahmanadilovic

private val parentJob = Job()

override fun onResume() {
    super.onResume()
    getAllUsers()
    getAllPosts()
}

override fun onPause() {
    super.onPause()

abdurahmanadilovic

override suspend fun getBooleanValue(key: String, default: Boolean): Boolean = suspendCoroutine { continuation ->
    fireBaseDb.child("keys").child(key).addListenerForSingleValueEvent(object : ValueEventListener {
        override fun onCancelled(p0: DatabaseError?) {
            continuation.resume(default)
        }

        override fun onDataChange(p0: DataSnapshot?) {
            if (p0 != null) {
                continuation.resume(p0.getValue(Boolean::class.java) ?: default)
            } else {

abdurahmanadilovic

public static long minutesAgo(Calendar before, Calendar after){
  long diff = after.getTimeInMillis() - before.getTimeInMillis();
  return TimeUnit.MILLISECONDS.toMinutes(diff);
}

// junit test for the method above
@Test
public void testThreeMinutesAgo() throws Exception {
  Calendar now = Calendar.getInstance();
  Calendar threeMinutesAgo = (Calendar) now.clone();

abdurahmanadilovic

public class PrettyFormatCalendar{
  private Calendar before;

  public PrettyFormatCalendar(Calendar before) {
    this.before = before;
  }

  public long minutesAgoFrom(Calendar other){
    long diff = other.getTimeInMillis() - before.getTimeInMillis();
    return TimeUnit.MILLISECONDS.toMinutes(diff);

abdurahmanadilovic

// run the code below on https://try.kotlinlang.org with JUnit env
class CalendarUtilsTests{
  @Test
  fun testUtilsClass(){
    val now = Calendar.getInstance()
    val threeMinutesAgo = now.clone() as Calendar
    threeMinutesAgo.add(Calendar.MINUTE, -3)
    assertEquals("3 minutes ago", "${threeMinutesAgo.minutesAgoFrom(now)} minutes ago")
  }

abdurahmanadilovic

fun <T> MutableList<T>.swap(index1: Int, index2: Int) {
  val tmp = this[index1] // 'this' corresponds to the list
  this[index1] = this[index2]
  this[index2] = tmp
}

abdurahmanadilovic

class Person(val firstName: String, val lastName: String)

abdurahmanadilovic

class SecondaryConstructor(){
    val blog = "www.codingstoic.com"    
    val city = "Sarajevo"
    
    constructor(aValue: Int) : this(){
        println("a second constructor")
    }
    
    init{
        println("inside the first init block")

abdurahmanadilovic

class Person(val firstName: String){
    val blog = "www.codingstoic.com"    
    val city = "Sarajevo"
    
    init{
        println("by $firstName")
        println("inside init block")
        println("blog is $blog and city is $city")
    }