Advanced Android: [Lesson #][Step #][description]

[Productivix]

Describe the problem
A clear and concise description of what the problem is.
it seem to be written in Java and when you copy it in android studio, it converts it in Kotlin , with more or less success

In which lesson and step of the codelab can this issue be found?
Lesson number + step number. (e.g., Lesson 1.1, Step 1.3) : Advanced Android 03.1: Getting sensor data

How to reproduce?
What are the exact steps to reproduce the problem? just copy your code

Versions

1. What version of Android Studio are you using?
2. What API level are you targeting?

Additional information
Add any other context about the problem here.

codelab: advanced-android

The best code I add is :
class MainActivity : AppCompatActivity() {
private var mSensorManager: SensorManager? = null

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    mSensorManager = this.getSystemService(Context.SENSOR_SERVICE) as SensorManager?
    val sensorList: List<Sensor> = mSensorManager.getSensorList(Sensor.TYPE_ALL)

[Productivix]

rather :
class MainActivity : AppCompatActivity() {
private var mSensorManager: SensorManager? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
mSensorManager = this.getSystemService(SENSOR_SERVICE) as SensorManager?
val sensorList: List = mSensorManager.getSensorList(Sensor.TYPE_ALL)
val sensorText = StringBuilder()
for (currentSensor in sensorList) {
sensorText.append(currentSensor.name).append(
System.getProperty("line.separator"))
}
val sensorTextView = findViewById(R.id.sensor_list) as TextView
sensorTextView.text = sensorText

}

[Productivix]

after debug it is :
class MainActivity : AppCompatActivity() {
private var mSensorManager: SensorManager? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
mSensorManager = this.getSystemService(SENSOR_SERVICE) as SensorManager?
val sensorList = mSensorManager?.getSensorList(Sensor.TYPE_ALL)
val sensorText = StringBuilder()
if (sensorList != null) {
for (currentSensor in sensorList) {
sensorText.append(currentSensor.name).append(
System.getProperty("line.separator"))
}
}
val sensorTextView = findViewById(R.id.sensor_list) as TextView
sensorTextView.text = sensorText

}