diff --git a/app/src/main/java/pl/tpolgrabia/urbanexplorer/callbacks/StandardLocationListener.java b/app/src/main/java/pl/tpolgrabia/urbanexplorer/callbacks/StandardLocationListener.java
index efe5d3a..fe789c7 100644
--- a/app/src/main/java/pl/tpolgrabia/urbanexplorer/callbacks/StandardLocationListener.java
+++ b/app/src/main/java/pl/tpolgrabia/urbanexplorer/callbacks/StandardLocationListener.java
@@ -3,7 +3,6 @@ package pl.tpolgrabia.urbanexplorer.callbacks;
 import android.location.Location;
 import android.location.LocationListener;
 import android.os.Bundle;
-import android.util.Log;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
diff --git a/app/src/main/java/pl/tpolgrabia/urbanexplorer/callbacks/WikiInfoRunBrowserCallback.java b/app/src/main/java/pl/tpolgrabia/urbanexplorer/callbacks/WikiInfoRunBrowserCallback.java
index 0f6e110..06f1170 100644
--- a/app/src/main/java/pl/tpolgrabia/urbanexplorer/callbacks/WikiInfoRunBrowserCallback.java
+++ b/app/src/main/java/pl/tpolgrabia/urbanexplorer/callbacks/WikiInfoRunBrowserCallback.java
@@ -2,12 +2,13 @@ package pl.tpolgrabia.urbanexplorer.callbacks;
 
 import android.content.Intent;
 import android.net.Uri;
-import android.util.Log;
 import android.widget.Toast;
 import com.androidquery.callback.AjaxCallback;
 import com.androidquery.callback.AjaxStatus;
 import org.json.JSONException;
 import org.json.JSONObject;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import pl.tpolgrabia.urbanexplorer.dto.wiki.app.WikiAppObject;
 import pl.tpolgrabia.urbanexplorer.fragments.WikiLocationsFragment;
 
@@ -15,6 +16,7 @@ import pl.tpolgrabia.urbanexplorer.fragments.WikiLocationsFragment;
  * Created by tpolgrabia on 14.09.16.
  */
 public class WikiInfoRunBrowserCallback extends AjaxCallback<JSONObject> {
+    private static final Logger lg = LoggerFactory.getLogger(WikiInfoRunBrowserCallback.class);
     private static final String CLASS_TAG = WikiInfoRunBrowserCallback.class.getSimpleName();
     private WikiLocationsFragment wikiLocationsFragment;
     private final WikiAppObject item;
@@ -44,7 +46,7 @@ public class WikiInfoRunBrowserCallback extends AjaxCallback<JSONObject> {
                 Uri.parse(wikiUrl));
             wikiLocationsFragment.startActivity(intent);
         } catch (JSONException e) {
-            Log.e(CLASS_TAG, "Error", e);
+            lg.error("JSON error", e);
         }
     }
 }
diff --git a/app/src/main/java/pl/tpolgrabia/urbanexplorer/handlers/SwipeHandler.java b/app/src/main/java/pl/tpolgrabia/urbanexplorer/handlers/SwipeHandler.java
index f789a08..765593f 100644
--- a/app/src/main/java/pl/tpolgrabia/urbanexplorer/handlers/SwipeHandler.java
+++ b/app/src/main/java/pl/tpolgrabia/urbanexplorer/handlers/SwipeHandler.java
@@ -1,14 +1,16 @@
 package pl.tpolgrabia.urbanexplorer.handlers;
 
-import android.util.Log;
 import android.view.GestureDetector;
 import android.view.MotionEvent;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import pl.tpolgrabia.urbanexplorer.MainActivity;
 
 /**
  * Created by tpolgrabia on 13.09.16.
  */
 public class SwipeHandler implements GestureDetector.OnGestureListener {
+    private static final Logger lg = LoggerFactory.getLogger(SwipeHandler.class);
     private static final String CLASS_TAG = SwipeHandler.class.getSimpleName();
     private final MainActivity activity;
     private static final float SWIPE_THRESHOLD = 50;
@@ -56,8 +58,8 @@ public class SwipeHandler implements GestureDetector.OnGestureListener {
 
         float diffx = e2.getX() - e1.getX();
         float diffy = e2.getY() - e1.getY();
-        Log.d(CLASS_TAG, "Flinging... diffx: " + diffx + " diffy" + diffy
-            + ", velocityx: " + velocityX + ", velocityY: " + velocityY);
+        lg.debug(CLASS_TAG, "Flinging... diffx: {} diffy: {}, velocityx: {}, velocityY: {}",
+            diffx, diffy, velocityX, velocityY);
 
         if (Math.abs(diffx) > Math.abs(diffy)) {
             // horizontal moves