Some refactoring and added Network check before download to see if it solves issue with DNS lookup freeze.

app/src/main/java/com/ericsson/uecontrol/core/behaviour/UeBehaviourFileDownload.java

@@ -1,6 +1,7 @@
 package com.ericsson.uecontrol.core.behaviour;
 
 import com.ericsson.uecontrol.core.UeBehaviour;
+import com.ericsson.uecontrol.core.util.UrlUtil;
 import com.ericsson.uecontrol.gui.util.Configurator.Configurable;
 
 import org.apache.log4j.Logger;
@@ -31,11 +32,7 @@ public class UeBehaviourFileDownload extends UeBehaviour {
         log.debug("Downloading file: " + url);
 
         byte[] data = new byte[BUFFER_SIZE];
-        URLConnection connection = url.openConnection();
-        connection.setConnectTimeout(5000);
-        connection.setReadTimeout(3000);
-        connection.setUseCaches(false);
-        connection.connect();
+        URLConnection connection = UrlUtil.getURLConnection(url);
         InputStream in = new BufferedInputStream(connection.getInputStream());
 
         long progress = 0;

app/src/main/java/com/ericsson/uecontrol/core/behaviour/UeBehaviourFtpUpload.java

@@ -2,6 +2,7 @@ package com.ericsson.uecontrol.core.behaviour;
 
 import com.ericsson.uecontrol.core.UeBehaviour;
 import com.ericsson.uecontrol.core.util.ThroughputCalculator;
+import com.ericsson.uecontrol.core.util.UrlUtil;
 import com.ericsson.uecontrol.gui.util.Configurator.Configurable;
 
 import org.apache.log4j.Logger;
@@ -39,10 +40,7 @@ public class UeBehaviourFtpUpload extends UeBehaviour {
         log.debug("Uploading file: " + url);
 
         byte[] data = new byte[BUFFER_SIZE];
-        URLConnection connection = url.openConnection();
-        connection.setConnectTimeout(5000);
-        connection.setReadTimeout(3000);
-        connection.connect();
+        URLConnection connection = UrlUtil.getURLConnection(url);
         OutputStream out = new BufferedOutputStream(connection.getOutputStream());
 
         int total = 0;

app/src/main/java/com/ericsson/uecontrol/core/behaviour/UeBehaviourSurfing.java

@@ -1,6 +1,7 @@
 package com.ericsson.uecontrol.core.behaviour;
 
 import com.ericsson.uecontrol.core.UeBehaviour;
+import com.ericsson.uecontrol.core.util.UrlUtil;
 import com.ericsson.uecontrol.gui.util.Configurator.Configurable;
 
 import org.apache.log4j.Logger;
@@ -71,16 +72,17 @@ public class UeBehaviourSurfing extends UeBehaviour {
         long totalRead = 0;
 
         for(int i=0; i<urlList.size(); i++) {
+            if(!UrlUtil.isNetworkAvailable()){
+                try { Thread.sleep(100); } catch (InterruptedException e) { }
+                continue;
+            }
+            InputStream in = null;
             try {
                 URLContainer cont = urlList.get(i);
                 log.debug("Downloading: " + cont.url);
 
-                URLConnection connection = cont.url.openConnection();
-                connection.setConnectTimeout(5000);
-                connection.setReadTimeout(3000);
-                connection.setUseCaches(false);
-                connection.connect();
-                InputStream in = new BufferedInputStream(connection.getInputStream());
+                URLConnection connection = UrlUtil.getURLConnection(cont.url);
+                in = new BufferedInputStream(connection.getInputStream());
 
                 if (estimatedDataLength < 0)
                     estimatedDataLength = in.available();
@@ -104,6 +106,8 @@ public class UeBehaviourSurfing extends UeBehaviour {
             }catch(IOException e){
                 log.warn(null, e);
                 if(retException == null) retException = e;
+            }finally {
+                if(in != null) in.close();
             }
         }
 
@@ -113,6 +117,7 @@ public class UeBehaviourSurfing extends UeBehaviour {
             throw retException;
     }
 
+
     private static final Pattern[] PARSABLE_CONTENT_INCLUSION_PATTERNS = new Pattern[]{
             // HTML
             Pattern.compile("<iframe.* src=\"(.*?)\"", Pattern.CASE_INSENSITIVE),

app/src/main/java/com/ericsson/uecontrol/core/util/UrlUtil.java

@@ -0,0 +1,42 @@
+package com.ericsson.uecontrol.core.util;
+
+import android.content.Context;
+import android.net.ConnectivityManager;
+import android.net.NetworkInfo;
+
+import com.ericsson.uecontrol.gui.MainActivity;
+
+import java.io.IOException;
+import java.net.URL;
+import java.net.URLConnection;
+
+/**
+ * Created by ezivkoc on 2014-09-18.
+ */
+public class UrlUtil {
+
+    public static URLConnection getURLConnection(URL url) throws IOException {
+        if(!isNetworkAvailable())
+            throw new IOException("No Data Network Available");
+
+        URLConnection connection = url.openConnection();
+        connection.setConnectTimeout(5000);
+        connection.setReadTimeout(3000);
+        connection.setUseCaches(false);
+        connection.connect();
+
+        return connection;
+    }
+
+    public static boolean isNetworkAvailable() {
+        ConnectivityManager cm = (ConnectivityManager)
+                MainActivity.getContext().getSystemService(Context.CONNECTIVITY_SERVICE);
+        NetworkInfo networkInfo = cm.getActiveNetworkInfo();
+        // if no network is available networkInfo will be null
+        // otherwise check if we are connected
+        if (networkInfo != null && networkInfo.isConnected()) {
+            return true;
+        }
+        return false;
+    }
+}