I’m starting in MVVM architecture and Kotlin reactive programming.
How can I use kotlin LiveData, Coroutines and/or Observable to do in optionSelected() function a return only after the user click in par1 or par2 buttons to return the content to second while of insertionSort() function?
class PlaceholderFragment : Fragment() {
var par1:Button? = null
var par2:Button? = null
var parTextLive: MutableLiveData<String> = MutableLiveData<String>()
var arr = arrayOf("homework", "chores", "shopping")
var i = -1
var j: Int = 0
var tmp: String = ""
var clicked: Boolean = false
var parText: String = ""
var len: Int = arr.size
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
val root = inflater.inflate(R.layout.fragment_main, container, false)
par1 = root!!.findViewById(R.id.par1) as Button
par2 = root!!.findViewById(R.id.par2) as Button
lifecycleScope.launch {
insertionSort()
}
par1!!.setOnClickListener {
lifecycleScope.launch {
parTextLive.value = (par1!!.text.toString())
parText = (par1!!.text.toString())
}
}
par2!!.setOnClickListener {
lifecycleScope.launch {
parTextLive.value = (par2!!.text.toString())
parText = (par2!!.text.toString())
}
}
return root
}
suspend fun optionSelected(str1: String, str2: String): String {
return withContext(Dispatchers.Main) {
println("opções setadas: $str1 or $str2")
par1!!.text = str1
par2!!.text = str2
// I setted the buttons pair1 and pair2 with texts of str1 and str2. When the user click in one of them, I want to return the text of clicked button
delay(5000) //substitute the delay by some emitter event of user click
return@withContext str1 //returning the variable parTextLive with the refreshed value
}
}
suspend fun insertionSort(): Array<String> {
return withContext(Dispatchers.Default) {
while(len-- != 0) {
tmp = arr[++i];
j = i
while (j-- != 0 && (optionSelected(arr[j], tmp) == arr[j])) {
arr[j + 1] = arr[j];
}
arr[j + 1] = tmp
}
return@withContext arr.apply { reverse() }
}
}
}