Kenwood NMEA: do not crash app on API<r5

src/backend/KenwoodTnc.scala

@@ -6,20 +6,24 @@ import _root_.android.util.Log
 
 import _root_.java.io.{InputStream, OutputStream, OutputStreamWriter, PrintWriter}
 
-class KenwoodTnc(service : AprsService, prefs : PrefsWrapper) extends BluetoothTnc(service, prefs)
-		with GpsStatus.NmeaListener {
+class KenwoodTnc(service : AprsService, prefs : PrefsWrapper) extends BluetoothTnc(service, prefs) {
 	override val TAG = "APRSdroid.KenwoodTnc"
 
 	val locMan = service.getSystemService(Context.LOCATION_SERVICE).asInstanceOf[LocationManager]
 	var output : OutputStreamWriter = null
 
-	locMan.addNmeaListener(this)
+	var listener : NmeaListener = null
+	if (android.os.Build.VERSION.SDK_INT >= 5) {
+		listener = new NmeaListener()
+		locMan.addNmeaListener(listener)
+	}
 
 	override def createTncProto(is : InputStream, os : OutputStream) = {
 		output = new OutputStreamWriter(os)
 		new KenwoodProto(is)
 	}
 
+	class NmeaListener extends GpsStatus.NmeaListener() {
 	def onNmeaReceived(timestamp : Long, nmea : String) {
 		if (output != null && (nmea.startsWith("$GPGGA") || nmea.startsWith("$GPRMC"))) {
 			Log.d(TAG, "NMEA >>> " + nmea)
@@ -32,10 +36,11 @@ class KenwoodTnc(service : AprsService, prefs : PrefsWrapper) extends BluetoothT
 			}
 		} else
 			Log.d(TAG, "NMEA --- " + nmea)
-	}
+	}}
 
 	override def stop() {
-		locMan.removeNmeaListener(this)
+		if (android.os.Build.VERSION.SDK_INT >= 5)
+			locMan.removeNmeaListener(listener)
 		super.stop()
 	}
 }