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 1a583c69..9d1276f3 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
@@ -41,7 +41,6 @@ import android.support.v4.content.FileProvider;
 import android.support.v4.view.GravityCompat;
 import android.support.v4.widget.DrawerLayout;
 import android.support.v7.app.ActionBarDrawerToggle;
-import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.Toolbar;
 import android.util.Log;
 import android.view.Menu;
@@ -55,6 +54,7 @@ import com.health.openscale.core.OpenScale;
 import com.health.openscale.core.bluetooth.BluetoothCommunication;
 import com.health.openscale.core.datatypes.ScaleMeasurement;
 import com.health.openscale.core.datatypes.ScaleUser;
+import com.health.openscale.gui.activities.BaseAppCompatActivity;
 import com.health.openscale.gui.activities.DataEntryActivity;
 import com.health.openscale.gui.activities.SettingsActivity;
 import com.health.openscale.gui.activities.UserSettingsActivity;
@@ -70,7 +70,7 @@ import java.util.List;
 
 import cat.ereza.customactivityoncrash.config.CaocConfig;
 
-public class MainActivity extends AppCompatActivity
+public class MainActivity extends BaseAppCompatActivity
         implements SharedPreferences.OnSharedPreferenceChangeListener{
     private SharedPreferences prefs;
     private static boolean firstAppStart = true;
@@ -91,16 +91,9 @@ public class MainActivity extends AppCompatActivity
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
-        prefs = PreferenceManager.getDefaultSharedPreferences(this);
-
-        String app_theme = prefs.getString("app_theme", "Light");
-
-        if (app_theme.equals("Dark")) {
-            setTheme(R.style.AppTheme_Dark);
-        }
-
         super.onCreate(savedInstanceState);
 
+        prefs = PreferenceManager.getDefaultSharedPreferences(this);
         prefs.registerOnSharedPreferenceChangeListener(this);
 
         CaocConfig.Builder.create()
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/activities/BaseAppCompatActivity.java b/android_app/app/src/main/java/com/health/openscale/gui/activities/BaseAppCompatActivity.java
new file mode 100644
index 00000000..9262727f
--- /dev/null
+++ b/android_app/app/src/main/java/com/health/openscale/gui/activities/BaseAppCompatActivity.java
@@ -0,0 +1,77 @@
+/* Copyright (C) 2018 Erik Johansson <erik@ejohansson.se>
+*
+*    This program is free software: you can redistribute it and/or modify
+*    it under the terms of the GNU General Public License as published by
+*    the Free Software Foundation, either version 3 of the License, or
+*    (at your option) any later version.
+*
+*    This program is distributed in the hope that it will be useful,
+*    but WITHOUT ANY WARRANTY; without even the implied warranty of
+*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+*    GNU General Public License for more details.
+*
+*    You should have received a copy of the GNU General Public License
+*    along with this program.  If not, see <http://www.gnu.org/licenses/>
+*/
+
+package com.health.openscale.gui.activities;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.content.res.Configuration;
+import android.os.Bundle;
+import android.preference.PreferenceManager;
+import android.support.v7.app.AppCompatActivity;
+import android.text.TextUtils;
+
+import com.health.openscale.R;
+
+import java.util.Locale;
+
+public class BaseAppCompatActivity extends AppCompatActivity {
+    public static final String PREFERENCE_APP_THEME = "app_theme";
+    public static final String PREFERENCE_LANGUAGE = "language";
+
+    public static Context createBaseContext(Context context) {
+        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
+
+        String language = prefs.getString(PREFERENCE_LANGUAGE, "");
+        if (language.isEmpty()) {
+            return context;
+        }
+
+        Locale locale;
+        String[] localeParts = TextUtils.split(language, "-");
+        if (localeParts.length == 2) {
+            locale = new Locale(localeParts[0], localeParts[1]);
+        }
+        else {
+            locale = new Locale(localeParts[0]);
+        }
+        Locale.setDefault(locale);
+
+        Configuration config = context.getResources().getConfiguration();
+        config.setLocale(locale);
+
+        return context.createConfigurationContext(config);
+    }
+
+    public static void applyTheme(Context context) {
+        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
+
+        if (prefs.getString(PREFERENCE_APP_THEME, "").equals("Dark")) {
+            context.setTheme(R.style.AppTheme_Dark);
+        }
+    }
+
+    @Override
+    protected void attachBaseContext(Context context) {
+        super.attachBaseContext(createBaseContext(context));
+    }
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        applyTheme(this);
+        super.onCreate(savedInstanceState);
+    }
+}
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/activities/DataEntryActivity.java b/android_app/app/src/main/java/com/health/openscale/gui/activities/DataEntryActivity.java
index 5fa221e7..6f7fac94 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/activities/DataEntryActivity.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/activities/DataEntryActivity.java
@@ -24,7 +24,6 @@ import android.graphics.drawable.Drawable;
 import android.os.Bundle;
 import android.preference.PreferenceManager;
 import android.support.v4.graphics.drawable.DrawableCompat;
-import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.Toolbar;
 import android.view.Menu;
 import android.view.MenuInflater;
@@ -49,7 +48,7 @@ import java.text.DateFormat;
 import java.util.Date;
 import java.util.List;
 
-public class DataEntryActivity extends AppCompatActivity {
+public class DataEntryActivity extends BaseAppCompatActivity {
     public static String EXTRA_ID = "id";
     private static String PREF_EXPAND = "expandEvaluator";
 
@@ -80,12 +79,6 @@ public class DataEntryActivity extends AppCompatActivity {
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
-        String app_theme = PreferenceManager.getDefaultSharedPreferences(this).getString("app_theme", "Light");
-
-        if (app_theme.equals("Dark")) {
-            setTheme(R.style.AppTheme_Dark);
-        }
-
         super.onCreate(savedInstanceState);
 
         setContentView(R.layout.activity_dataentry);
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/activities/SettingsActivity.java b/android_app/app/src/main/java/com/health/openscale/gui/activities/SettingsActivity.java
index 623311d4..af6c4590 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/activities/SettingsActivity.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/activities/SettingsActivity.java
@@ -16,6 +16,7 @@
 package com.health.openscale.gui.activities;
 
 import android.app.Fragment;
+import android.content.Context;
 import android.content.SharedPreferences;
 import android.graphics.PorterDuff;
 import android.graphics.drawable.Drawable;
@@ -37,14 +38,14 @@ public class SettingsActivity extends PreferenceActivity
     private static List<String> fragments = new ArrayList<String>();
     private Fragment currentFragment;
 
+    @Override
+    protected void attachBaseContext(Context context) {
+        super.attachBaseContext(BaseAppCompatActivity.createBaseContext(context));
+    }
+
     @Override
     public void onCreate(Bundle savedInstanceState) {
-        String app_theme = PreferenceManager.getDefaultSharedPreferences(this).getString("app_theme", "Light");
-
-        if (app_theme.equals("Dark")) {
-            setTheme(R.style.AppTheme_Dark);
-        }
-
+        BaseAppCompatActivity.applyTheme(this);
         super.onCreate(savedInstanceState);
     }
 
@@ -65,7 +66,8 @@ public class SettingsActivity extends PreferenceActivity
 
     @Override
     public void onSharedPreferenceChanged(SharedPreferences preferences, String key) {
-        if (key.equals("app_theme")) {
+        if (key.equals(BaseAppCompatActivity.PREFERENCE_APP_THEME)
+                || key.equals(BaseAppCompatActivity.PREFERENCE_LANGUAGE)) {
             recreate();
         }
     }
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/activities/UserSettingsActivity.java b/android_app/app/src/main/java/com/health/openscale/gui/activities/UserSettingsActivity.java
index 623137b2..4299beb6 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/activities/UserSettingsActivity.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/activities/UserSettingsActivity.java
@@ -23,9 +23,7 @@ import android.content.Intent;
 import android.graphics.Color;
 import android.graphics.drawable.Drawable;
 import android.os.Bundle;
-import android.preference.PreferenceManager;
 import android.support.v4.graphics.drawable.DrawableCompat;
-import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.Toolbar;
 import android.view.Menu;
 import android.view.MenuInflater;
@@ -46,7 +44,7 @@ import java.util.Calendar;
 import java.util.Date;
 import java.util.List;
 
-public class UserSettingsActivity extends AppCompatActivity {
+public class UserSettingsActivity extends BaseAppCompatActivity {
     public static String EXTRA_ID = "id";
     public static String EXTRA_MODE = "mode";
 
@@ -74,13 +72,8 @@ public class UserSettingsActivity extends AppCompatActivity {
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
-        String app_theme = PreferenceManager.getDefaultSharedPreferences(this).getString("app_theme", "Light");
-
-        if (app_theme.equals("Dark")) {
-            setTheme(R.style.AppTheme_Dark);
-        }
-
         super.onCreate(savedInstanceState);
+
         setContentView(R.layout.activity_usersettings);
         context = this;
 
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/preferences/BluetoothPreferences.java b/android_app/app/src/main/java/com/health/openscale/gui/preferences/BluetoothPreferences.java
index 008c234f..41d073a1 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/preferences/BluetoothPreferences.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/preferences/BluetoothPreferences.java
@@ -97,11 +97,11 @@ public class BluetoothPreferences extends PreferenceFragment implements SharedPr
 
                 for (Map.Entry<String, String> entry : foundDevices.entrySet()) {
                     if (getActivity() != null) {
-                        Preference prefBtDevice = new Preference(getActivity().getBaseContext());
+                        Preference prefBtDevice = new Preference(getActivity());
                         prefBtDevice.setSummary(entry.getKey());
 
                         for (BluetoothCommunication.BT_DEVICE_ID btScaleID : BluetoothCommunication.BT_DEVICE_ID.values()) {
-                            BluetoothCommunication btDevice = BluetoothCommunication.getBtDevice(getActivity().getBaseContext(), btScaleID);
+                            BluetoothCommunication btDevice = BluetoothCommunication.getBtDevice(getActivity(), btScaleID);
 
                             if (btDevice.checkDeviceName(entry.getValue())) {
                                 prefBtDevice.setOnPreferenceClickListener(new onClickListenerDeviceSelect());
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 2459ff32..76599b0a 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
@@ -50,7 +50,7 @@ public class UsersPreferences extends PreferenceFragment {
 
         for (ScaleUser scaleUser : scaleUserList)
         {
-            Preference prefUser = new Preference(getActivity().getBaseContext());
+            Preference prefUser = new Preference(getActivity());
             prefUser.setOnPreferenceClickListener(new onClickListenerUserSelect());
 
             if (scaleUser.getId() == selectedUserId) {
@@ -66,7 +66,7 @@ public class UsersPreferences extends PreferenceFragment {
         }
 
 
-        Preference prefAddUser = new Preference(getActivity().getBaseContext());
+        Preference prefAddUser = new Preference(getActivity());
 
         prefAddUser.setOnPreferenceClickListener(new onClickListenerAddUser());
         prefAddUser.setTitle("+ " + getResources().getString(R.string.label_add_user));
diff --git a/android_app/app/src/main/java/com/health/openscale/gui/views/MeasurementView.java b/android_app/app/src/main/java/com/health/openscale/gui/views/MeasurementView.java
index 2f01024f..c1a759d8 100644
--- a/android_app/app/src/main/java/com/health/openscale/gui/views/MeasurementView.java
+++ b/android_app/app/src/main/java/com/health/openscale/gui/views/MeasurementView.java
@@ -81,13 +81,6 @@ public abstract class MeasurementView extends TableLayout {
 
     public MeasurementView(Context context, String text, Drawable icon) {
         super(context);
-        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
-        String app_theme = prefs.getString("app_theme", "Light");
-
-        if (app_theme.equals("Dark")) {
-            context.setTheme(R.style.AppTheme_Dark);
-        }
-
         initView(context);
 
         nameView.setText(text);
diff --git a/android_app/app/src/main/res/values/arrays.xml b/android_app/app/src/main/res/values/arrays.xml
new file mode 100644
index 00000000..10bbc433
--- /dev/null
+++ b/android_app/app/src/main/res/values/arrays.xml
@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string-array name="language_entries">
+        <item>@string/language_default</item>
+        <item>@string/language_brazilian_portuguese</item>
+        <item>@string/language_catalan</item>
+        <item>@string/language_czech</item>
+        <item>@string/language_dutch</item>
+        <item>@string/language_english</item>
+        <item>@string/language_french</item>
+        <item>@string/language_german</item>
+        <item>@string/language_japanese</item>
+        <item>@string/language_polish</item>
+        <item>@string/language_slovak</item>
+        <item>@string/language_spanish</item>
+        <item>@string/language_swedish</item>
+        <item>@string/language_turkish</item>
+    </string-array>
+
+    <string-array name="language_values">
+        <item />
+        <item>pt-BR</item>
+        <item>ca</item>
+        <item>cs</item>
+        <item>nl</item>
+        <item>en</item>
+        <item>fr</item>
+        <item>de</item>
+        <item>ja</item>
+        <item>pl</item>
+        <item>sk</item>
+        <item>es</item>
+        <item>sv</item>
+        <item>tr</item>
+    </string-array>
+</resources>
\ No newline at end of file
diff --git a/android_app/app/src/main/res/values/strings.xml b/android_app/app/src/main/res/values/strings.xml
index 9160ad12..db993dc7 100644
--- a/android_app/app/src/main/res/values/strings.xml
+++ b/android_app/app/src/main/res/values/strings.xml
@@ -200,4 +200,19 @@
     <string name="label_measurement_in_percent">Measurement in %</string>
     <string name="label_estimate_measurement">Estimate measurement</string>
     <string name="label_estimation_formula">Estimation formula</string>
+    <string name="language_default">System default</string>
+    <string name="label_language">Language</string>
+    <string name="language_brazilian_portuguese" translatable="false">Brazilian Portuguese</string>
+    <string name="language_catalan" translatable="false">Catalan (català)</string>
+    <string name="language_czech" translatable="false">Czech (čeština)</string>
+    <string name="language_dutch" translatable="false">Dutch (Nederlands)</string>
+    <string name="language_english" translatable="false">English</string>
+    <string name="language_french" translatable="false">French (français)</string>
+    <string name="language_german" translatable="false">German (Deutsch)</string>
+    <string name="language_japanese" translatable="false">Japanese (日本語 (にほんご))</string>
+    <string name="language_polish" translatable="false">Polish (język polski)</string>
+    <string name="language_slovak" translatable="false">Slovak (Slovenčina)</string>
+    <string name="language_spanish" translatable="false">Spanish (Español)</string>
+    <string name="language_swedish" translatable="false">Swedish (Svenska)</string>
+    <string name="language_turkish" translatable="false">Turkish (Türkçe)</string>
 </resources>
diff --git a/android_app/app/src/main/res/xml/general_preferences.xml b/android_app/app/src/main/res/xml/general_preferences.xml
index c1a22025..95760210 100644
--- a/android_app/app/src/main/res/xml/general_preferences.xml
+++ b/android_app/app/src/main/res/xml/general_preferences.xml
@@ -1,5 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
+    <ListPreference
+        android:defaultValue=""
+        android:entries="@array/language_entries"
+        android:entryValues="@array/language_values"
+        android:key="language"
+        android:title="@string/label_language" />
     <ListPreference android:title="@string/label_theme" android:entries="@array/themes_entries" android:entryValues="@array/themes_values" android:key="app_theme" android:defaultValue="Light"/>
     <CheckBoxPreference android:title="@string/label_delete_confirmation" android:summaryOn="@string/info_is_enable" android:summaryOff="@string/info_is_not_enable" android:key="deleteConfirmationEnable" android:defaultValue="true" />
 </PreferenceScreen>
\ No newline at end of file