diff --git a/mobile/src/main/java/eu/inmite/apps/smsjizdenka/activity/MainActivity.java b/mobile/src/main/java/eu/inmite/apps/smsjizdenka/activity/MainActivity.java
index c22074e..d4e67e4 100755
--- a/mobile/src/main/java/eu/inmite/apps/smsjizdenka/activity/MainActivity.java
+++ b/mobile/src/main/java/eu/inmite/apps/smsjizdenka/activity/MainActivity.java
@@ -204,7 +204,7 @@ private void handleIntent(Intent intent) {
         if (intent.hasExtra(EXTRA_AREA)) {
             City city = CityManager.get(c).getCityByPubtranCity(c, intent.getStringExtra(EXTRA_AREA));
             if (city != null) {
-                int minutes = intent.getIntExtra(EXTRA_MINUTES, 0);
+                intent.getIntExtra(EXTRA_MINUTES, 0);
                 //SL.get(AnalyticsService.class).trackEvent("pubtran", "on-start", "city", city.city, "minutes", String.valueOf(minutes));
                 Intent i = new Intent(c, CityTicketsActivity.class);
                 i.putExtra(CityTicketsActivity.EXTRA_CITY, city.city);
diff --git a/mobile/src/main/java/eu/inmite/apps/smsjizdenka/adapter/TicketsAdapter.java b/mobile/src/main/java/eu/inmite/apps/smsjizdenka/adapter/TicketsAdapter.java
index 03d6cdf..9267a3f 100644
--- a/mobile/src/main/java/eu/inmite/apps/smsjizdenka/adapter/TicketsAdapter.java
+++ b/mobile/src/main/java/eu/inmite/apps/smsjizdenka/adapter/TicketsAdapter.java
@@ -234,7 +234,7 @@ public void onClick(View v) {
     @Override
     public View newView(Context context, Cursor cursor, ViewGroup parent) {
         final LayoutInflater li = LayoutInflater.from(context);
-        final Time validTo = FormatUtil.timeFrom3339(cursor.getString(iValidTo));
+        FormatUtil.timeFrom3339(cursor.getString(iValidTo));
         View v;
         final ViewHolder h = new ViewHolder();
         if (cursor.getLong(iId) == mActiveId) {
diff --git a/mobile/src/main/java/eu/inmite/apps/smsjizdenka/data/DatabaseHelper.java b/mobile/src/main/java/eu/inmite/apps/smsjizdenka/data/DatabaseHelper.java
index 9e95d28..2668def 100644
--- a/mobile/src/main/java/eu/inmite/apps/smsjizdenka/data/DatabaseHelper.java
+++ b/mobile/src/main/java/eu/inmite/apps/smsjizdenka/data/DatabaseHelper.java
@@ -175,7 +175,6 @@ public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
             } catch (Exception e) {
                 DebugLog.e("cannot update database. Uninstall and install the app once again");
             }
-            oldVersion = 11;
         }
     }
 
@@ -215,7 +214,6 @@ private void createDB(SQLiteDatabase db) {
 
     private void createTableCities(SQLiteDatabase db) {
         StringBuffer sql = new StringBuffer();
-        sql = new StringBuffer();
         sql.append("CREATE TABLE ");
         sql.append(CITY_TABLE_NAME);
         sql.append(" (");
diff --git a/mobile/src/main/java/eu/inmite/apps/smsjizdenka/framework/App.java b/mobile/src/main/java/eu/inmite/apps/smsjizdenka/framework/App.java
index 451ac25..19316a5 100644
--- a/mobile/src/main/java/eu/inmite/apps/smsjizdenka/framework/App.java
+++ b/mobile/src/main/java/eu/inmite/apps/smsjizdenka/framework/App.java
@@ -237,14 +237,14 @@ public synchronized Object getSystemService(String name) {
                 return mServicesInstances.get(name);
             } else {
                 try {
-                    Class<?> clazz = null;
+                    Class<?> clazz;
                     if (mServicesImplementationsMapping.containsKey(name)) {
                         clazz = mServicesImplementationsMapping.get(name);
                     } else {
                         clazz = Class.forName(name);
                     }
 
-                    Object serviceInstance = null;
+                    Object serviceInstance;
                     try {
                         Constructor<?> constructor = clazz.getConstructor(Context.class);
                         serviceInstance = constructor.newInstance(getApplicationContext());
diff --git a/mobile/src/main/java/eu/inmite/apps/smsjizdenka/service/UpdateService.java b/mobile/src/main/java/eu/inmite/apps/smsjizdenka/service/UpdateService.java
index 16d830b..edcb5e6 100644
--- a/mobile/src/main/java/eu/inmite/apps/smsjizdenka/service/UpdateService.java
+++ b/mobile/src/main/java/eu/inmite/apps/smsjizdenka/service/UpdateService.java
@@ -252,7 +252,7 @@ private JSONObject getVersion(boolean online) throws IOException, JSONException
     private String readResult(InputStream is) throws IOException {
         StringBuilder sb = new StringBuilder();
         BufferedReader r = new BufferedReader(new InputStreamReader(is, "utf-8"), 1000);
-        String l = null;
+        String l;
         while ((l = r.readLine()) != null) {
             sb.append(l);
         }
diff --git a/wear/src/main/java/eu/inmite/apps/smsjizdenka/util/ImageUtil.java b/wear/src/main/java/eu/inmite/apps/smsjizdenka/util/ImageUtil.java
index 692e471..92c0850 100644
--- a/wear/src/main/java/eu/inmite/apps/smsjizdenka/util/ImageUtil.java
+++ b/wear/src/main/java/eu/inmite/apps/smsjizdenka/util/ImageUtil.java
@@ -33,7 +33,7 @@ private ImageUtil() {}
     public static Bitmap combineTwoImages(Context context, int backgroundResource, int color) {
 
         Bitmap bmpBackground = null;
-        Bitmap big = null;
+        Bitmap big;
         if (backgroundResource == 0) {
             big = Bitmap.createBitmap(400, 400, Bitmap.Config.ARGB_8888);
         } else {