- Use Ringtone looping capability on Android P+.

app/src/main/kotlin/com/tutpro/baresip/BaresipService.kt

@@ -5,8 +5,7 @@ import android.app.*
 import android.app.Notification.VISIBILITY_PUBLIC
 import android.content.*
 import android.media.*
-import android.net.ConnectivityManager
-import android.net.LinkProperties
+import android.net.*
 import android.net.wifi.WifiManager
 import android.os.IBinder
 import android.os.PowerManager
@@ -18,8 +17,6 @@ import android.support.v4.content.LocalBroadcastManager
 import android.os.Build
 import android.support.v4.app.NotificationCompat.VISIBILITY_PRIVATE
 import android.support.v4.content.ContextCompat
-import android.net.Network
-import android.net.NetworkRequest
 import android.provider.Settings
 
 import java.io.File
@@ -731,6 +728,10 @@ class BaresipService: Service() {
     private fun startRinging() {
         am.mode = AudioManager.MODE_RINGTONE
         requestAudioFocus(AudioManager.STREAM_RING)
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
+            rt.isLooping = true
+            rt.play()
+        } else {
             rt.play()
             rtTimer = Timer()
             rtTimer!!.scheduleAtFixedRate(object : TimerTask() {
@@ -741,13 +742,18 @@ class BaresipService: Service() {
                 }
             }, 1000 * 1, 1000 * 1)
         }
+    }
 
     private fun stopRinging() {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
+            if (rt.isPlaying) rt.stop()
+        } else {
             if (rtTimer != null) {
                 rtTimer!!.cancel()
                 rtTimer = null
                 if (rt.isPlaying) rt.stop()
             }
+        }
         abandonAudioFocus()
         am.mode = AudioManager.MODE_IN_COMMUNICATION
     }