diff --git a/android_app/app/src/main/java/com/health/openscale/core/OpenScale.java b/android_app/app/src/main/java/com/health/openscale/core/OpenScale.java
index ff72ed47..79596aa1 100644
--- a/android_app/app/src/main/java/com/health/openscale/core/OpenScale.java
+++ b/android_app/app/src/main/java/com/health/openscale/core/OpenScale.java
@@ -319,7 +319,7 @@ public class OpenScale {
         for (int i = 0; i < scaleUsers.size(); i++) {
             List<ScaleMeasurement> scaleUserData = measurementDAO.getAll(scaleUsers.get(i).getId());
 
-            float lastWeight = 0;
+            float lastWeight;
 
             if (scaleUserData.size() > 0) {
                 lastWeight = scaleUserData.get(0).getWeight();
diff --git a/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothMiScale.java b/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothMiScale.java
index c5e02178..3c93fc35 100644
--- a/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothMiScale.java
+++ b/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothMiScale.java
@@ -196,8 +196,6 @@ public class BluetoothMiScale extends BluetoothCommunication {
 
     private void parseBytes(byte[] weightBytes) {
         try {
-            float weight = 0.0f;
-
             final byte ctrlByte = weightBytes[0];
 
             final boolean isWeightRemoved = isBitSet(ctrlByte, 7);
@@ -224,6 +222,7 @@ public class BluetoothMiScale extends BluetoothCommunication {
                 final int min = (int) weightBytes[8];
                 final int sec = (int) weightBytes[9];
 
+                float weight;
                 if (isLBSUnit || isCattyUnit) {
                     weight = (float) (((weightBytes[2] & 0xFF) << 8) | (weightBytes[1] & 0xFF)) / 100.0f;
                 } else {
diff --git a/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothMiScale2.java b/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothMiScale2.java
index 5e9ad0e3..44950297 100644
--- a/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothMiScale2.java
+++ b/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothMiScale2.java
@@ -175,8 +175,6 @@ public class BluetoothMiScale2 extends BluetoothCommunication {
 
     private void parseBytes(byte[] weightBytes) {
         try {
-            float weight = 0.0f;
-
             final byte ctrlByte0 = weightBytes[0];
             final byte ctrlByte1 = weightBytes[1];
 
@@ -195,6 +193,7 @@ public class BluetoothMiScale2 extends BluetoothCommunication {
                 final int min = (int) weightBytes[7];
                 final int sec = (int) weightBytes[8];
 
+                float weight;
                 if (isLBSUnit || isCattyUnit) {
                     weight = (float) (((weightBytes[12] & 0xFF) << 8) | (weightBytes[11] & 0xFF)) / 100.0f;
                 } else {
diff --git a/android_app/app/src/main/java/com/health/openscale/core/datatypes/ScaleMeasurement.java b/android_app/app/src/main/java/com/health/openscale/core/datatypes/ScaleMeasurement.java
index e6d88989..c09e9aec 100644
--- a/android_app/app/src/main/java/com/health/openscale/core/datatypes/ScaleMeasurement.java
+++ b/android_app/app/src/main/java/com/health/openscale/core/datatypes/ScaleMeasurement.java
@@ -272,7 +272,7 @@ public class ScaleMeasurement implements Cloneable {
     }
 
     public float getBMR(ScaleUser scaleUser) {
-        float bmr = 0.0f;
+        float bmr;
 
         // BMR formula by Mifflin, St Jeor et al: A new predictive equation for resting energy expenditure in healthy individuals
         if (scaleUser.getGender().isMale()) {
diff --git a/android_app/app/src/main/java/com/health/openscale/core/evaluation/EvaluationResult.java b/android_app/app/src/main/java/com/health/openscale/core/evaluation/EvaluationResult.java
index 3fb385b0..0470217e 100644
--- a/android_app/app/src/main/java/com/health/openscale/core/evaluation/EvaluationResult.java
+++ b/android_app/app/src/main/java/com/health/openscale/core/evaluation/EvaluationResult.java
@@ -24,13 +24,6 @@ public class EvaluationResult {
     public float highLimit;
     public EVAL_STATE eval_state;
 
-    public EvaluationResult() {
-        this.value = -1.0f;
-        this.lowLimit = -1.0f;
-        this.highLimit = -1.0f;
-        this.eval_state = EVAL_STATE.UNDEFINED;
-    }
-
     public EvaluationResult(float value, float lowLimit, float highLimit, EVAL_STATE eval_state)
     {
         this.value = value;
@@ -38,5 +31,4 @@ public class EvaluationResult {
         this.highLimit = highLimit;
         this.eval_state = eval_state;
     }
-
 }
diff --git a/android_app/app/src/main/java/com/health/openscale/core/evaluation/EvaluationSheet.java b/android_app/app/src/main/java/com/health/openscale/core/evaluation/EvaluationSheet.java
index 3c74825c..ed20ca17 100644
--- a/android_app/app/src/main/java/com/health/openscale/core/evaluation/EvaluationSheet.java
+++ b/android_app/app/src/main/java/com/health/openscale/core/evaluation/EvaluationSheet.java
@@ -168,8 +168,8 @@ public class EvaluationSheet {
 
     public EvaluationResult evaluateWeight(float weight) {
         float body_height_squared = (evalUser.getBodyHeight() / 100.0f) * (evalUser.getBodyHeight() / 100.0f);
-        float lowLimit = 0.0f;
-        float highLimit = 0.0f;
+        float lowLimit;
+        float highLimit;
 
         if (evalUser.getGender().isMale()) {
             lowLimit = body_height_squared * 20.0f;
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/MainActivity.java b/android_app/app/src/main/java/com/health/openscale/gui/MainActivity.java
index 3c2bd551..a88f1055 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/MainActivity.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/MainActivity.java
@@ -46,7 +46,6 @@ import android.support.v7.widget.Toolbar;
 import android.util.Log;
 import android.view.Menu;
 import android.view.MenuItem;
-import android.view.View;
 import android.widget.Toast;
 
 import com.health.openscale.BuildConfig;
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/fragments/TableFragment.java b/android_app/app/src/main/java/com/health/openscale/gui/fragments/TableFragment.java
index 8c97d678..ed993b8b 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/fragments/TableFragment.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/fragments/TableFragment.java
@@ -242,8 +242,6 @@ public class TableFragment extends Fragment implements FragmentUpdateListener {
 
         private Spanned[][] stringCache;
 
-        private ArrayList<HashMap<Integer, Spanned>> dataList;
-
         public void setMeasurements(List<MeasurementView> visibleMeasurements,
                                     List<ScaleMeasurement> scaleMeasurements,
                                     int maxSize) {
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/preferences/GeneralPreferences.java b/android_app/app/src/main/java/com/health/openscale/gui/preferences/GeneralPreferences.java
index 51af6c7b..56638138 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/preferences/GeneralPreferences.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/preferences/GeneralPreferences.java
@@ -31,8 +31,6 @@ import java.util.List;
 import java.util.Set;
 
 public class GeneralPreferences extends PreferenceFragment implements SharedPreferences.OnSharedPreferenceChangeListener {
-    private static final String PREFERENCE_KEY_APP_THEME = "app_theme";
-
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);