TimerCoroutine.kt

package com.example.livedatatest

import android.content.Intent
import android.os.Bundle
import android.util.Log
import android.widget.Button
import android.widget.EditText
import androidx.appcompat.app.AppCompatActivity
import androidx.core.widget.addTextChangedListener
import androidx.lifecycle.lifecycleScope
import kotlinx.coroutines.coroutineScope
import kotlinx.coroutines.*
import kotlinx.coroutines.runBlocking
import java.util.*

//import implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.4.1'
//import implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.3.1'


class MainActivity : AppCompatActivity() {

    lateinit var editText:EditText
    lateinit var editText2:EditText
    var number=0
    private lateinit var timer: Job

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        editText=findViewById<EditText>(R.id.editText)
        editText2=findViewById<EditText>(R.id.editText2)
        var star="*"
        editText.addTextChangedListener {
            it!!.length

//            runBlocking {
//                delay(1000L)
//                editText2.setText("*")
//            }
            lifecycleScope.launch(Dispatchers.Main) {
                var tempString=""
                for(times in 1..it.length){
                    tempString += "*"
                }
                delay(500L)
                editText2.setText(tempString)
            }


//            Timer().schedule("this",1000L)

        }

        timer= startCoroutineTimer(delayMillis = 0, repeatMillis = 100) {
            number++
            Log.i("Timer ran","running $number")
            if (number==100)
                timer.cancel()
        }

//        timer.cancel()

    }

    private inline fun startCoroutineTimer(delayMillis: Long = 0, repeatMillis: Long = 0, crossinline action: () -> Unit) = GlobalScope.launch {
        delay(delayMillis)
        if (repeatMillis > 0) {
            while (true) {
                action()
                delay(repeatMillis)
            }
        } else {
            action()
        }
    }

}