Cannot use vibration in a Thread - multithreading

Question

I'm trying to use the vibrator service inside a Thread class but when I do so, I have an error which says "Type mismatch: inferred type is String but Context was expected"
here is my code :
class myThread: Thread() {
override fun run() {
var vibration = getSystemService(Context.VIBRATOR_SERVICE) as Vibrator
for(i in 1..5) {
vibration.vibrate(100)
Thread.sleep(1000)
}
}
}
It works in my mainActivity class but it doesn't in a Thread. Thank you in advance for any help.

Answer 1

"It works in my mainActivity class but it doesn't in a Thread. "
getSystemService is defined in Activity class with the signature below.
public Object getSystemService(#ServiceName #NonNull String name)
When you use same method name in any other class, you are using ContextCompat helper class which requires a context and serviceClass.
// ContextCompat.class
public static <T> T getSystemService(#NonNull Context context, #NonNull Class<T> serviceClass)
You may change your MyThread class like below.
class MyThread(
private val appContext: Context
) : Thread() {
override fun run() {
val vibrator = getSystemService(appContext, Vibrator::class.java) as Vibrator
for (i in 1..5) {
vibrator.vibrate(100)
Thread.sleep(1000)
}
}
}
// Or inject vibrator by constructor
class MyThread2(
private val vibrator: Vibrator
) : Thread() {
override fun run() {
for (i in 1..5) {
vibrator.vibrate(100)
Thread.sleep(1000)
}
}
}