check that network connection exists at application start

app/src/main/cpp/baresip.c

@@ -881,4 +881,4 @@ Java_com_tutpro_baresip_Utils_uri_1decode(JNIEnv *env, jobject thiz, jstring jav
     int res = uri_decode(&uri2, &pl);
     (*env)->ReleaseStringUTFChars(env, javaUri, uri);
     return res == 0;
-}
+}

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

@@ -37,9 +37,11 @@ class AccountsActivity : AppCompatActivity() {
             } else if (Account.exists(MainActivity.uas, aor)) {
                 Log.e("Baresip", "Account $aor already exists")
             } else {
-                if (UserAgent.ua_alloc("<$aor>;regq=0.5;pubint=0;regint=600") != 0)
+                if (UserAgent.ua_alloc("<$aor>;regq=0.5;pubint=0;regint=600") != 0) {
                     Log.e("Baresip", "Failed to allocate UA $aor")
-                else {
+                    Utils.alertView(this, "Notice",
+                            "Failed to allocate new account. Check your network connection.")
+                } else {
                     SystemClock.sleep(200);
                     newAorView.setText("")
                     newAorView.setHint("SIP URI user@domain")

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

@@ -4,6 +4,7 @@ import android.Manifest
 import android.app.Notification.VISIBILITY_PUBLIC
 import android.app.NotificationManager
 import android.app.PendingIntent
+import android.app.PendingIntent.getActivity
 import android.content.Context
 import android.content.Intent
 import android.content.pm.PackageManager
@@ -22,6 +23,7 @@ import android.view.*
 import android.util.Log
 import android.widget.RelativeLayout
 import android.media.AudioManager
+import android.os.SystemClock
 import android.support.v7.app.NotificationCompat
 import android.support.v7.view.menu.ActionMenuItemView
 import android.text.Editable
@@ -312,9 +314,16 @@ class MainActivity : AppCompatActivity() {
 
         if (!running) {
             Log.i("Baresip", "Starting Baresip with path $path")
-            nm.notify(NOTIFICATION_ID, nb.build())
-            Thread(Runnable { baresipStart(path) }).start()
-            running = true
+            if (!Utils.isConnected(this)) {
+                Toast.makeText(this, "No network connection!",
+                        Toast.LENGTH_LONG).show()
+                finish()
+                // System.exit(0)
+            } else {
+                nm.notify(NOTIFICATION_ID, nb.build())
+                Thread(Runnable { baresipStart(path) }).start()
+                running = true
+            }
         }
     }
 

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

@@ -3,6 +3,8 @@ package com.tutpro.baresip
 import android.content.Context
 import android.support.v7.app.AlertDialog
 import android.util.Log
+import android.net.ConnectivityManager
+import android.net.NetworkInfo
 
 import java.io.*
 
@@ -115,6 +117,17 @@ object Utils {
         return res
     }
 
+    fun isConnected(context: Context): Boolean {
+        val cm = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
+        val activeNetwork = cm.activeNetworkInfo
+        if (activeNetwork != null && activeNetwork.isConnected) {
+            val networkType = activeNetwork.type
+            return networkType == ConnectivityManager.TYPE_WIFI || networkType == ConnectivityManager.TYPE_MOBILE
+        } else {
+            return false
+        }
+    }
+
     external fun cmd_exec(cmd: String): Int
     external fun uri_decode(uri: String): Boolean
     external fun audio_codecs(): String