Fix lint issues

app/src/main/java/de/kuschku/quasseldroid/service/QuasseldroidNotificationManager.kt

@@ -33,6 +33,7 @@ import android.graphics.Canvas
 import android.graphics.drawable.Drawable
 import android.net.Uri
 import android.os.Build
+import androidx.annotation.RequiresApi
 import androidx.core.app.ActivityCompat
 import androidx.core.app.NotificationCompat
 import androidx.core.app.NotificationManagerCompat
@@ -73,7 +74,7 @@ class QuasseldroidNotificationManager @Inject constructor(private val context: C
       prepareChannels()
   }
 
-  @TargetApi(Build.VERSION_CODES.O)
+  @RequiresApi(Build.VERSION_CODES.O)
   private fun prepareChannels() {
     val notificationManager =
       context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

app/src/main/java/de/kuschku/quasseldroid/util/AndroidHandlerThread.kt

@@ -113,14 +113,6 @@ class AndroidHandlerThread(name: String) : HandlerThread(name) {
     started().let { handler?.postAtFrontOfQueue(r) }
     ?: throw RuntimeException("Thread not started")
 
-  fun removeCallbacks(r: () -> Unit) =
-    started().let { handler?.removeCallbacks(r) }
-    ?: throw RuntimeException("Thread not started")
-
-  fun removeCallbacks(r: () -> Unit, token: Any) =
-    started().let { handler?.removeCallbacks(r, token) }
-    ?: throw RuntimeException("Thread not started")
-
   fun sendMessage(msg: Message): Boolean =
     started().let { handler?.sendMessage(msg) }
     ?: throw RuntimeException("Thread not started")

lint.xml

@@ -54,4 +54,5 @@
   <issue id="NewerVersionAvailable" severity="informational"/>
   <issue id="SetTextI18n" severity="informational"/>
   <issue id="DefaultLocale" severity="informational"/>
+  <issue id="UseKtx" severity="informational"/>
 </lint>