android: Add method to check for connectivity to NetworkManager

src/frontends/android/jni/libandroidbridge/kernel/network_manager.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2012-2013 Tobias Brunner
+ * Copyright (C) 2012-2015 Tobias Brunner
  * Hochschule fuer Technik Rapperswil
  *
  * This program is free software; you can redistribute it and/or modify it
@@ -90,8 +90,8 @@ METHOD(network_manager_t, add_connectivity_cb, void,
 				this->connectivity_cb.cb = cb;
 				this->connectivity_cb.data = data;
 			}
-			androidjni_detach_thread();
 		}
+		androidjni_detach_thread();
 	}
 	this->mutex->unlock(this->mutex);
 }
@@ -132,6 +132,28 @@ METHOD(network_manager_t, remove_connectivity_cb, void,
 	this->mutex->unlock(this->mutex);
 }
 
+METHOD(network_manager_t, is_connected, bool,
+	private_network_manager_t *this)
+{
+	JNIEnv *env;
+	jmethodID method_id;
+	bool connected = FALSE;
+
+	androidjni_attach_thread(&env);
+	method_id = (*env)->GetMethodID(env, this->cls, "isConnected", "()Z");
+	if (!method_id)
+	{
+		androidjni_exception_occurred(env);
+	}
+	else
+	{
+		connected = (*env)->CallBooleanMethod(env, this->obj, method_id);
+		connected = !androidjni_exception_occurred(env) && connected;
+	}
+	androidjni_detach_thread();
+	return connected;
+}
+
 METHOD(network_manager_t, destroy, void,
 	private_network_manager_t *this)
 {
@@ -174,6 +196,7 @@ network_manager_t *network_manager_create(jobject context)
 		.public = {
 			.add_connectivity_cb = _add_connectivity_cb,
 			.remove_connectivity_cb = _remove_connectivity_cb,
+			.is_connected = _is_connected,
 			.destroy = _destroy,
 		},
 		.mutex = mutex_create(MUTEX_TYPE_DEFAULT),

src/frontends/android/jni/libandroidbridge/kernel/network_manager.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2012-2013 Tobias Brunner
+ * Copyright (C) 2012-2015 Tobias Brunner
  * Hochschule fuer Technik Rapperswil
  *
  * This program is free software; you can redistribute it and/or modify it
@@ -65,6 +65,13 @@ struct network_manager_t {
 	void (*remove_connectivity_cb)(network_manager_t *this,
 								   connectivity_cb_t cb);
 
+	/**
+	 * Check whether we currently have connectivity
+	 *
+	 * @return					TRUE if currently connected
+	 */
+	bool (*is_connected)(network_manager_t *this);
+
 	/**
 	 * Destroy a network_manager_t instance
 	 */

src/frontends/android/src/org/strongswan/android/logic/NetworkManager.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2012-2013 Tobias Brunner
+ * Copyright (C) 2012-2015 Tobias Brunner
  * Hochschule fuer Technik Rapperswil
  *
  * This program is free software; you can redistribute it and/or modify it
@@ -42,12 +42,21 @@ public class NetworkManager extends BroadcastReceiver
 		mContext.unregisterReceiver(this);
 	}
 
+	public boolean isConnected()
+	{
+		ConnectivityManager cm = (ConnectivityManager)mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
+		NetworkInfo info = null;
+		if (cm != null)
+		{
+			info = cm.getActiveNetworkInfo();
+		}
+		return info != null && info.isConnected();
+	}
+
 	@Override
 	public void onReceive(Context context, Intent intent)
 	{
-		ConnectivityManager cm = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
-		NetworkInfo info = cm.getActiveNetworkInfo();
-		networkChanged(info == null || !info.isConnected());
+		networkChanged(!isConnected());
 	}
 
 	/**