Android App stops with a Keeps Stopping message - kotlin-android-extensions

Question

I am following the instructions at CodeLabs to add the countMe function
But when I run it I get a "My First App keeps stopping" message.
import android.view.View
import android.widget.TextView
import android.widget.Toast
import android.widget.Toast.*
class MainActivity() : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
}
fun countMe (view: View) {
// Get the text view
val showCountTextView = findViewById<TextView>(R.id.textView)
// Get the value of the text view.
val countString = showCountTextView.text.toString()
// Convert value to a number and increment it
var count: Int = Integer.parseInt(countString)
count++
// Display the new value in the text view.
showCountTextView.text = count.toString();
}
}
the layout is
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/FirstHello"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" android:id="#+id/textView"/>
<Button
android:text="#string/toast"
android:onClick="toastMe"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/toast_button" android:layout_marginTop="8dp"
app:layout_constraintTop_toBottomOf="#+id/textView" app:layout_constraintStart_toStartOf="parent"
android:layout_marginLeft="8dp" android:layout_marginStart="8dp" app:layout_constraintEnd_toEndOf="parent"
android:layout_marginEnd="8dp" android:layout_marginRight="8dp"/>
<Button
android:text="Count"
android:onClick="countMe"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/count_button" android:layout_marginTop="152dp"
app:layout_constraintTop_toTopOf="#+id/toast_button" app:layout_constraintStart_toStartOf="parent"
android:layout_marginLeft="48dp" android:layout_marginStart="48dp"/>
<Button
android:text="Random"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/random_button" android:layout_marginTop="160dp"
app:layout_constraintTop_toBottomOf="#+id/textView" app:layout_constraintEnd_toEndOf="parent"
android:layout_marginEnd="72dp" android:layout_marginRight="72dp"/>
</androidx.constraintlayout.widget.ConstraintLayout>
When I run the app and click the button the application stops.

Answer 1

It worked when I changed the text to contain a number