diff --git a/android_app/app/src/androidTest/java/com/health/openscale/DatabaseMigrationTest.java b/android_app/app/src/androidTest/java/com/health/openscale/DatabaseMigrationTest.java
index 562c14fc..001de449 100644
--- a/android_app/app/src/androidTest/java/com/health/openscale/DatabaseMigrationTest.java
+++ b/android_app/app/src/androidTest/java/com/health/openscale/DatabaseMigrationTest.java
@@ -17,7 +17,6 @@
 package com.health.openscale;
 
 import android.arch.persistence.db.SupportSQLiteDatabase;
-import android.arch.persistence.db.SupportSQLiteOpenHelper;
 import android.arch.persistence.db.framework.FrameworkSQLiteOpenHelperFactory;
 import android.arch.persistence.room.testing.MigrationTestHelper;
 import android.content.ContentValues;
diff --git a/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothExingtechY1.java b/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothExingtechY1.java
index 4b858f2a..32956ee3 100644
--- a/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothExingtechY1.java
+++ b/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothExingtechY1.java
@@ -19,8 +19,6 @@ package com.health.openscale.core.bluetooth;
 import android.bluetooth.BluetoothGatt;
 import android.bluetooth.BluetoothGattCharacteristic;
 import android.content.Context;
-import android.content.SharedPreferences;
-import android.preference.PreferenceManager;
 
 import com.health.openscale.core.OpenScale;
 import com.health.openscale.core.datatypes.ScaleMeasurement;
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 b0d6afde..abfe052f 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
@@ -26,7 +26,6 @@ import android.util.Log;
 import com.health.openscale.core.OpenScale;
 import com.health.openscale.core.datatypes.ScaleMeasurement;
 import com.health.openscale.core.datatypes.ScaleUser;
-import com.health.openscale.core.utils.Converters;
 
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/fragments/GraphFragment.java b/android_app/app/src/main/java/com/health/openscale/gui/fragments/GraphFragment.java
index 98f2d935..88614fff 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/fragments/GraphFragment.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/fragments/GraphFragment.java
@@ -181,7 +181,6 @@ public class GraphFragment extends Fragment implements FragmentUpdateListener {
             @Override
             public boolean onMenuItemClick(MenuItem item) {
 
-
                 switch (item.getItemId()) {
                     case R.id.enableMonth:
                         if (item.isChecked()) {
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/preferences/MeasurementPreferences.java b/android_app/app/src/main/java/com/health/openscale/gui/preferences/MeasurementPreferences.java
index fe195dd4..a59e3254 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/preferences/MeasurementPreferences.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/preferences/MeasurementPreferences.java
@@ -26,7 +26,6 @@ import android.preference.MultiSelectListPreference;
 import android.preference.Preference;
 import android.preference.PreferenceFragment;
 import android.preference.PreferenceGroup;
-import android.preference.PreferenceManager;
 import android.preference.SwitchPreference;
 import android.widget.Toast;
 
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/preferences/UsersPreferences.java b/android_app/app/src/main/java/com/health/openscale/gui/preferences/UsersPreferences.java
index 0b37fbdf..2459ff32 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/preferences/UsersPreferences.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/preferences/UsersPreferences.java
@@ -16,11 +16,9 @@
 package com.health.openscale.gui.preferences;
 
 import android.content.Intent;
-import android.content.SharedPreferences;
 import android.os.Bundle;
 import android.preference.Preference;
 import android.preference.PreferenceFragment;
-import android.preference.PreferenceManager;
 
 import com.health.openscale.R;
 import com.health.openscale.core.OpenScale;