START AND STOP BUTTON

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.widget.Button
import android.widget.Toast
import com.google.android.material.snackbar.Snackbar
class MainActivity : AppCompatActivity() {
private lateinit var startBtn : Button
private lateinit var stopBtn : Button
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
var task = LongOperation()
startBtn = findViewById(R.id.start)
stopBtn = findViewById(R.id.end)
startBtn.setOnClickListener {
val contextView = findViewById<View>(R.id.root)
val snack = Snackbar.make(contextView, "Demonstration of Asynchronous Task",
Snackbar.LENGTH_SHORT)
snack.show()
task.execute()
}
stopBtn.setOnClickListener {
task.cancel(true)
val contextView = findViewById<View>(R.id.root)
val snack = Snackbar.make(contextView, "Asynchronous Task Interrupted",
Snackbar.LENGTH_SHORT)
snack.show()
}
}
}
Long Operation:
import android.content.Context
import android.os.AsyncTask
import android.util.Log
import android.widget.Toast
import androidx.core.content.ContextCompat
import kotlin.coroutines.coroutineContext
class LongOperation : AsyncTask<String?, Void?, String>() {
protected override fun doInBackground(vararg params: String?): String? {
try {
Thread.sleep(100000)
} catch (e: InterruptedException) {
Log.e("LongOperation", "Interrupted", e)
return "Interrupted"
}
return "Executed"
}
override fun onPostExecute(result: String) {}
companion object {
fun execute() {}
}
}
Activity.xml:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/root"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<com.google.android.material.button.MaterialButton
android:id="@+id/start"
android:layout_width="wrap_content"
android:layout_height="54dp"
android:layout_margin="8dp"
android:text="Start Task"
app:layout_constraintBottom_toTopOf="@+id/end"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_chainStyle="packed" />
<com.google.android.material.button.MaterialButton
android:id="@+id/end"
android:layout_width="wrap_content"
android:layout_height="54dp"
android:layout_margin="8dp"
android:text=" End Task "
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/start" />
</androidx.constraintlayout.widget.ConstraintLayout>