diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 207a72cc..82a03149 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -123,7 +123,7 @@
             android:icon="@drawable/ic_launcher_window"
             android:label="@string/c_app_name_on_screen"
             android:launchMode="singleInstance"
-            android:theme="@style/Cpp.Theme.Material.Dialog">
+            android:theme="@style/Cpp.Theme.Translucent">
 
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
diff --git a/app/src/main/java/org/solovyev/android/calculator/App.java b/app/src/main/java/org/solovyev/android/calculator/App.java
index 6d37bc37..a95ed149 100644
--- a/app/src/main/java/org/solovyev/android/calculator/App.java
+++ b/app/src/main/java/org/solovyev/android/calculator/App.java
@@ -22,11 +22,15 @@
 
 package org.solovyev.android.calculator;
 
+import android.app.Activity;
 import android.app.Application;
+import android.content.ActivityNotFoundException;
 import android.content.Context;
+import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
 import android.content.res.Configuration;
+import android.net.Uri;
 import android.os.Build;
 import android.os.IBinder;
 import android.preference.PreferenceManager;
@@ -37,27 +41,34 @@ import android.support.v4.app.FragmentManager;
 import android.support.v4.app.FragmentTransaction;
 import android.text.Spannable;
 import android.text.SpannableString;
+import android.text.SpannableStringBuilder;
 import android.text.style.ForegroundColorSpan;
+import android.util.Log;
 import android.view.View;
 import android.view.inputmethod.InputMethodManager;
+
 import com.squareup.otto.Bus;
+
 import org.solovyev.android.Check;
 import org.solovyev.android.Views;
+import org.solovyev.android.calculator.floating.FloatingCalculatorService;
 import org.solovyev.android.calculator.ga.Ga;
 import org.solovyev.android.calculator.language.Languages;
-import org.solovyev.android.calculator.floating.FloatingCalculatorService;
 import org.solovyev.android.calculator.view.ScreenMetrics;
 import org.solovyev.android.calculator.wizard.CalculatorWizards;
 import org.solovyev.android.wizard.Wizards;
 import org.solovyev.common.JPredicate;
 
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
 import java.util.Collection;
+import java.util.Formatter;
 import java.util.List;
+import java.util.Locale;
 import java.util.concurrent.Executor;
 import java.util.concurrent.atomic.AtomicInteger;
 
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
 /**
  * This class aggregates several useful in any Android application interfaces and provides access to {@link android.app.Application} object from a static context.
  * NOTE: use this class only if you don't use and dependency injection library (if you use any you can directly set interfaces through it). <br/>
@@ -335,4 +346,16 @@ public final class App {
             imm.hideSoftInputFromWindow(token, 0);
         }
     }
+
+    public static void showSystemPermissionSettings(@NonNull Activity activity,
+            @NonNull String action) {
+        try {
+            final Intent intent = new Intent(action);
+            intent.setData(Uri.parse("package:" + activity.getPackageName()));
+            activity.startActivity(intent);
+        } catch (ActivityNotFoundException e) {
+            Log.e(TAG,
+                    "Failed to show permission settings for " + action, e);
+        }
+    }
 }
\ No newline at end of file
diff --git a/app/src/main/java/org/solovyev/android/calculator/BaseDialogFragment.java b/app/src/main/java/org/solovyev/android/calculator/BaseDialogFragment.java
index 71f2860e..2e627b84 100644
--- a/app/src/main/java/org/solovyev/android/calculator/BaseDialogFragment.java
+++ b/app/src/main/java/org/solovyev/android/calculator/BaseDialogFragment.java
@@ -79,10 +79,13 @@ public abstract class BaseDialogFragment extends DialogFragment implements View.
         return button;
     }
 
-    protected abstract void onPrepareDialog(@NonNull AlertDialog.Builder builder);
+    protected void onPrepareDialog(@NonNull AlertDialog.Builder builder) {
+    }
 
     @Nullable
-    protected abstract View onCreateDialogView(@NonNull Context context, @NonNull LayoutInflater inflater, @Nullable Bundle savedInstanceState);
+    protected View onCreateDialogView(@NonNull Context context, @NonNull LayoutInflater inflater, @Nullable Bundle savedInstanceState) {
+        return null;
+    }
 
     protected void setError(@NonNull TextInputLayout textInput, @StringRes int error, Object... errorArgs) {
         setError(textInput, getString(error, errorArgs));
diff --git a/app/src/main/java/org/solovyev/android/calculator/errors/FixableErrorFragment.java b/app/src/main/java/org/solovyev/android/calculator/errors/FixableErrorFragment.java
index 46edbde4..d20b867e 100644
--- a/app/src/main/java/org/solovyev/android/calculator/errors/FixableErrorFragment.java
+++ b/app/src/main/java/org/solovyev/android/calculator/errors/FixableErrorFragment.java
@@ -1,17 +1,20 @@
 package org.solovyev.android.calculator.errors;
 
 import android.app.Activity;
-import android.content.Context;
 import android.content.DialogInterface;
 import android.os.Bundle;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.support.v4.app.FragmentManager;
 import android.support.v7.app.AlertDialog;
-import android.view.LayoutInflater;
-import android.view.View;
+
 import org.solovyev.android.Check;
-import org.solovyev.android.calculator.*;
+import org.solovyev.android.calculator.App;
+import org.solovyev.android.calculator.AppComponent;
+import org.solovyev.android.calculator.BaseDialogFragment;
+import org.solovyev.android.calculator.Preferences;
+import org.solovyev.android.calculator.PreferredPreferences;
+import org.solovyev.android.calculator.R;
 
 import javax.annotation.Nonnull;
 import javax.inject.Inject;
@@ -89,10 +92,4 @@ public class FixableErrorFragment extends BaseDialogFragment {
             activity = null;
         }
     }
-
-    @Nullable
-    @Override
-    protected View onCreateDialogView(@NonNull Context context, @NonNull LayoutInflater inflater, @Nullable Bundle savedInstanceState) {
-        return null;
-    }
 }
diff --git a/app/src/main/java/org/solovyev/android/calculator/floating/FloatingCalculatorActivity.java b/app/src/main/java/org/solovyev/android/calculator/floating/FloatingCalculatorActivity.java
index 5fa4c8ce..1618e204 100644
--- a/app/src/main/java/org/solovyev/android/calculator/floating/FloatingCalculatorActivity.java
+++ b/app/src/main/java/org/solovyev/android/calculator/floating/FloatingCalculatorActivity.java
@@ -22,17 +22,75 @@
 
 package org.solovyev.android.calculator.floating;
 
-import android.app.Activity;
+import android.annotation.TargetApi;
+import android.content.DialogInterface;
+import android.os.Build;
 import android.os.Bundle;
+import android.provider.Settings;
+import android.support.annotation.NonNull;
+import android.support.v4.app.FragmentActivity;
+import android.support.v7.app.AlertDialog;
+import android.support.v7.app.AppCompatActivity;
+
+import org.solovyev.android.Check;
+import org.solovyev.android.calculator.App;
+import org.solovyev.android.calculator.BaseDialogFragment;
+import org.solovyev.android.calculator.R;
+
+public class FloatingCalculatorActivity extends AppCompatActivity {
+
+    @TargetApi(Build.VERSION_CODES.M)
+    public static final class MyFragment extends BaseDialogFragment {
+
+        @Override
+        protected void onPrepareDialog(@NonNull AlertDialog.Builder builder) {
+            final String permission = getString(R.string.cpp_permission_overlay);
+            builder.setMessage(getString(R.string.cpp_missing_permission_msg, permission));
+            builder.setTitle(R.string.cpp_missing_permission_title);
+            builder.setPositiveButton(R.string.ok, this);
+        }
+
+        @Override
+        public void onClick(DialogInterface dialog, int which) {
+            switch (which) {
+                case DialogInterface.BUTTON_POSITIVE:
+                    final FragmentActivity activity = getActivity();
+                    App.showSystemPermissionSettings(activity,
+                            Settings.ACTION_MANAGE_OVERLAY_PERMISSION);
+                    dismiss();
+                    break;
+                default:
+                    super.onClick(dialog, which);
+                    break;
+            }
+        }
+
+        @Override
+        public void onDismiss(DialogInterface dialog) {
+            super.onDismiss(dialog);
+            final FragmentActivity activity = getActivity();
+            if (activity != null) {
+                activity.finish();
+            }
+        }
+    }
 
-public class FloatingCalculatorActivity extends Activity {
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
-        FloatingCalculatorService.show(this);
+        if (FloatingCalculatorView.isOverlayPermissionGranted(this)) {
+            FloatingCalculatorService.show(this);
+            finish();
+            return;
+        }
 
-        this.finish();
+        Check.isTrue(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M);
+        if (savedInstanceState == null) {
+            App.showDialog(new MyFragment(), "no-overlay-permission-dialog",
+                    getSupportFragmentManager());
+        }
     }
+
 }
diff --git a/app/src/main/java/org/solovyev/android/calculator/floating/FloatingCalculatorView.java b/app/src/main/java/org/solovyev/android/calculator/floating/FloatingCalculatorView.java
index f9a07b4b..62633587 100644
--- a/app/src/main/java/org/solovyev/android/calculator/floating/FloatingCalculatorView.java
+++ b/app/src/main/java/org/solovyev/android/calculator/floating/FloatingCalculatorView.java
@@ -26,6 +26,10 @@ import static android.view.HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING;
 import static android.view.HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING;
 import static android.view.HapticFeedbackConstants.KEYBOARD_TAP;
 import static android.view.HapticFeedbackConstants.LONG_PRESS;
+import static android.view.WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
+import static android.view.WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL;
+import static android.view.WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH;
+import static android.view.WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;
 import static org.solovyev.android.calculator.App.cast;
 
 import android.content.Context;
@@ -281,6 +285,23 @@ public class FloatingCalculatorView {
         }
     }
 
+    static boolean isOverlayPermissionGranted(@NonNull Context context) {
+        try {
+            final Context application = context.getApplicationContext();
+            final WindowManager wm =
+                    (WindowManager) application.getSystemService(Context.WINDOW_SERVICE);
+            if (wm == null) {
+                return false;
+            }
+            final View view = new View(application);
+            wm.addView(view, makeLayoutParams());
+            wm.removeView(view);
+            return true;
+        } catch (Exception e) {
+            return false;
+        }
+    }
+
     public void updateDisplayState(@Nonnull DisplayState displayState) {
         checkInit();
         displayView.setState(displayState);
@@ -406,24 +427,25 @@ public class FloatingCalculatorView {
 
         final WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
         if (!attached) {
-            final WindowManager.LayoutParams params = new WindowManager.LayoutParams(
-                    state.width,
-                    state.height,
-                    state.x,
-                    state.y,
-                    WindowManager.LayoutParams.TYPE_SYSTEM_ALERT,
-                    WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
-                            | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
-                            | WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH,
-                    PixelFormat.TRANSLUCENT);
-
+            final WindowManager.LayoutParams params = makeLayoutParams();
+            params.width = state.width;
+            params.height = state.height;
+            params.x = state.x;
+            params.y = state.y;
             params.gravity = Gravity.TOP | Gravity.LEFT;
-
             wm.addView(root, params);
             attached = true;
         }
     }
 
+    @Nonnull
+    private static WindowManager.LayoutParams makeLayoutParams() {
+        return new WindowManager.LayoutParams(
+                TYPE_SYSTEM_ALERT,
+                FLAG_NOT_FOCUSABLE | FLAG_NOT_TOUCH_MODAL | FLAG_WATCH_OUTSIDE_TOUCH,
+                PixelFormat.TRANSLUCENT);
+    }
+
     private void fold() {
         if (!folded) {
             headerTitle.setImageDrawable(headerTitleDrawable);
diff --git a/app/src/main/res/values-ar/text_imported.xml b/app/src/main/res/values-ar/text_imported.xml
index 7c39c5a9..c831131c 100644
--- a/app/src/main/res/values-ar/text_imported.xml
+++ b/app/src/main/res/values-ar/text_imported.xml
@@ -5,4 +5,5 @@
    <string name="cpp_prefs_language">اللغة</string>
    <string name="cpp_prefs_theme">المظهر</string>
    <string name="cpp_prefs_keep_screen_on">البقاء في الوضع النشط</string>
+   <string name="cpp_permission_overlay">الظهور أمام التطبيقات الأخرى</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values-ar/text_strings.xml b/app/src/main/res/values-ar/text_strings.xml
index d62d201a..ee4f6854 100644
--- a/app/src/main/res/values-ar/text_strings.xml
+++ b/app/src/main/res/values-ar/text_strings.xml
@@ -230,4 +230,6 @@
     <string name="cpp_new_in_version">الجديد في الإصدار %1$s</string>
     <string name="cpp_release_notes_choose_theme">هل تريد محاولة المواضيع المادية الجديدة؟ اختر منهم من القائمة:</string>
     <string name="cpp_system_language">System language</string>
+    <string name="cpp_missing_permission_title">إذن مفقود</string>
+    <string name="cpp_missing_permission_msg">يرجى تمكين إذن \"%1$s\" في إعدادات النظام</string>
 </resources>
diff --git a/app/src/main/res/values-cs/text_imported.xml b/app/src/main/res/values-cs/text_imported.xml
index 9ba6263e..1c5af800 100644
--- a/app/src/main/res/values-cs/text_imported.xml
+++ b/app/src/main/res/values-cs/text_imported.xml
@@ -5,4 +5,5 @@
    <string name="cpp_prefs_language">Jazyk</string>
    <string name="cpp_prefs_theme">Motiv</string>
    <string name="cpp_prefs_keep_screen_on">Nevypínat obrazovku</string>
+   <string name="cpp_permission_overlay">Vykreslení přes další aplikace</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values-cs/text_strings.xml b/app/src/main/res/values-cs/text_strings.xml
index 5f3e43f1..c5665810 100644
--- a/app/src/main/res/values-cs/text_strings.xml
+++ b/app/src/main/res/values-cs/text_strings.xml
@@ -230,4 +230,6 @@ Platební informace jsou uloženy na serveru společně s vaším účtem.\n\n K
     <string name="cpp_new_in_version">Nové ve verzi %1$s</string>
     <string name="cpp_release_notes_choose_theme">Chcete vyzkoušet nové Material témata? Vyberte je ze seznamu:</string>
     <string name="cpp_system_language">System language</string>
+    <string name="cpp_missing_permission_title">Chybějící oprávnění</string>
+    <string name="cpp_missing_permission_msg">Prosím, povolte v nastaveních systému oprávnění pro \"%1$s\"</string>
 </resources>
diff --git a/app/src/main/res/values-de/text_imported.xml b/app/src/main/res/values-de/text_imported.xml
index cb9da5e0..6261d69d 100644
--- a/app/src/main/res/values-de/text_imported.xml
+++ b/app/src/main/res/values-de/text_imported.xml
@@ -5,4 +5,5 @@
    <string name="cpp_prefs_language">Sprache</string>
    <string name="cpp_prefs_theme">Design</string>
    <string name="cpp_prefs_keep_screen_on">Aktiv lassen</string>
+   <string name="cpp_permission_overlay">Über anderen Apps einblenden</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values-de/text_strings.xml b/app/src/main/res/values-de/text_strings.xml
index 4477bb3d..07b4ecb8 100644
--- a/app/src/main/res/values-de/text_strings.xml
+++ b/app/src/main/res/values-de/text_strings.xml
@@ -229,4 +229,6 @@ Klicken Sie auf \"Weiter\" und Sie werden zu Google Play weitergeleitet, wo Sie
     <string name="cpp_new_in_version">Neu in Version %1$s</string>
     <string name="cpp_release_notes_choose_theme">Wollen Sie das neue Material-Design ausprobieren? Wählen sie aus der Liste:</string>
     <string name="cpp_system_language">System language</string>
+    <string name="cpp_missing_permission_title">Berechtigung fehlt</string>
+    <string name="cpp_missing_permission_msg">Bitte aktivieren Sie die Berechtigung \"%1$s\" in den Systemeinstellungen</string>
 </resources>
diff --git a/app/src/main/res/values-es/text_imported.xml b/app/src/main/res/values-es/text_imported.xml
index bb74c841..6e69924c 100644
--- a/app/src/main/res/values-es/text_imported.xml
+++ b/app/src/main/res/values-es/text_imported.xml
@@ -5,4 +5,5 @@
    <string name="cpp_prefs_language">Idioma</string>
    <string name="cpp_prefs_theme">Tema</string>
    <string name="cpp_prefs_keep_screen_on">Pantalla activa</string>
+   <string name="cpp_permission_overlay">Escribir sobre otras aplicaciones</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values-es/text_strings.xml b/app/src/main/res/values-es/text_strings.xml
index f14df0ba..ae761c34 100644
--- a/app/src/main/res/values-es/text_strings.xml
+++ b/app/src/main/res/values-es/text_strings.xml
@@ -229,4 +229,6 @@
   <string name="cpp_release_notes_choose_theme">¿Desea probar nuevos temas Material?
 Escojalos de la lista:</string>
     <string name="cpp_system_language">System language</string>
+  <string name="cpp_missing_permission_title">Falta el permiso</string>
+  <string name="cpp_missing_permission_msg">Por favor, activa el permiso \"%1$s\" en la configuración del sistema</string>
 </resources>
diff --git a/app/src/main/res/values-fi/text_imported.xml b/app/src/main/res/values-fi/text_imported.xml
index a0f3ebb6..70d56d23 100644
--- a/app/src/main/res/values-fi/text_imported.xml
+++ b/app/src/main/res/values-fi/text_imported.xml
@@ -5,4 +5,5 @@
    <string name="cpp_prefs_language">Kieli</string>
    <string name="cpp_prefs_theme">Teema</string>
    <string name="cpp_prefs_keep_screen_on">Pysy käynnissä</string>
+   <string name="cpp_permission_overlay">Piirrä muihin sovelluksiin</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values-fi/text_strings.xml b/app/src/main/res/values-fi/text_strings.xml
index bd181b0d..45b52d4d 100644
--- a/app/src/main/res/values-fi/text_strings.xml
+++ b/app/src/main/res/values-fi/text_strings.xml
@@ -224,4 +224,6 @@
     <string name="cpp_new_in_version">Uutta versiossa %1$s</string>
     <string name="cpp_release_notes_choose_theme">Haluatko kokeilla uusia materiaaliteemoja? Valitse luettelosta:</string>
     <string name="cpp_system_language">System language</string>
+    <string name="cpp_missing_permission_title">Käyttöoikeus puuttuu</string>
+    <string name="cpp_missing_permission_msg">Salli kohteen \"%1$s\" käyttöoikeus järjestelmäasetuksissa</string>
 </resources>
diff --git a/app/src/main/res/values-fr/text_imported.xml b/app/src/main/res/values-fr/text_imported.xml
index c92983df..d0beffef 100644
--- a/app/src/main/res/values-fr/text_imported.xml
+++ b/app/src/main/res/values-fr/text_imported.xml
@@ -5,4 +5,5 @@
    <string name="cpp_prefs_language">Langue</string>
    <string name="cpp_prefs_theme">Thème</string>
    <string name="cpp_prefs_keep_screen_on">Rester activé</string>
+   <string name="cpp_permission_overlay">Se superposer aux autres applis</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values-fr/text_strings.xml b/app/src/main/res/values-fr/text_strings.xml
index 3bc9cdd7..3d6622d2 100644
--- a/app/src/main/res/values-fr/text_strings.xml
+++ b/app/src/main/res/values-fr/text_strings.xml
@@ -227,4 +227,6 @@ En cliquant sur le bouton \'Continuer\' vous serez redirigés vers l\'applicatio
     <string name="cpp_new_in_version">Nouveautés de la version %1$s</string>
     <string name="cpp_release_notes_choose_theme">Voulez-vous essayer les nouveaux thèmes Material ? Choisissez-en dans la liste :</string>
     <string name="cpp_system_language">System language</string>
+    <string name="cpp_missing_permission_title">Autorisation manquante</string>
+    <string name="cpp_missing_permission_msg">Veuillez activer l\'autorisation \"%1$s\" dans les réglages systèmes</string>
 </resources>
diff --git a/app/src/main/res/values-it/text_imported.xml b/app/src/main/res/values-it/text_imported.xml
index bde8abf4..4e8ba1fe 100644
--- a/app/src/main/res/values-it/text_imported.xml
+++ b/app/src/main/res/values-it/text_imported.xml
@@ -5,4 +5,5 @@
    <string name="cpp_prefs_language">Lingua</string>
    <string name="cpp_prefs_theme">Tema</string>
    <string name="cpp_prefs_keep_screen_on">Rimani attivo</string>
+   <string name="cpp_permission_overlay">Spostamento su altre app</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values-it/text_strings.xml b/app/src/main/res/values-it/text_strings.xml
index 1f5fc7a2..ebd225d4 100644
--- a/app/src/main/res/values-it/text_strings.xml
+++ b/app/src/main/res/values-it/text_strings.xml
@@ -235,4 +235,6 @@ premendo \'continua\' sarai indirizzato all\'applicazione Google play per effett
     <string name="cpp_new_in_version">Novità nella versione %1$s</string>
     <string name="cpp_release_notes_choose_theme">Vuoi provare nuove temi Material design? Selezionali dalla lista:</string>
     <string name="cpp_system_language">System language</string>
+    <string name="cpp_missing_permission_title">Permesso assente</string>
+    <string name="cpp_missing_permission_msg">Per favore garantisci il permesso: \"%1$s\" nelle impostazioni</string>
 </resources>
diff --git a/app/src/main/res/values-ja/text_imported.xml b/app/src/main/res/values-ja/text_imported.xml
index d07d1181..9133dccb 100644
--- a/app/src/main/res/values-ja/text_imported.xml
+++ b/app/src/main/res/values-ja/text_imported.xml
@@ -5,4 +5,5 @@
    <string name="cpp_prefs_language">言語</string>
    <string name="cpp_prefs_theme">テーマ</string>
    <string name="cpp_prefs_keep_screen_on">スリープモードにしない</string>
+   <string name="cpp_permission_overlay">他のアプリの上に重ねて描画</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values-ja/text_strings.xml b/app/src/main/res/values-ja/text_strings.xml
index cd3470c5..2dc04d0c 100644
--- a/app/src/main/res/values-ja/text_strings.xml
+++ b/app/src/main/res/values-ja/text_strings.xml
@@ -236,4 +236,6 @@
     <string name="cpp_new_in_version">%1$sバージョンの新機能</string>
     <string name="cpp_release_notes_choose_theme">新しいマテリアルテーマを試してみたいですか？リストから選択してください:</string>
     <string name="cpp_system_language">System language</string>
+    <string name="cpp_missing_permission_title">不足している権限</string>
+    <string name="cpp_missing_permission_msg">システム設定で \"%1$s\" へのアクセス権限を許可してください</string>
 </resources>
diff --git a/app/src/main/res/values-nl/text_imported.xml b/app/src/main/res/values-nl/text_imported.xml
index 1460c85d..3679345d 100644
--- a/app/src/main/res/values-nl/text_imported.xml
+++ b/app/src/main/res/values-nl/text_imported.xml
@@ -5,4 +5,5 @@
    <string name="cpp_prefs_language">Taal</string>
    <string name="cpp_prefs_theme">Thema</string>
    <string name="cpp_prefs_keep_screen_on">Stand-by</string>
+   <string name="cpp_permission_overlay">Over andere apps tekenen</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values-nl/text_strings.xml b/app/src/main/res/values-nl/text_strings.xml
index 9a991a11..3ea8991b 100644
--- a/app/src/main/res/values-nl/text_strings.xml
+++ b/app/src/main/res/values-nl/text_strings.xml
@@ -228,4 +228,6 @@ Door op volgende te drukken, wordt u doorverwezen naar de Google Play store om d
     <string name="cpp_new_in_version">Nieuw in versie %1$s</string>
     <string name="cpp_release_notes_choose_theme">Wilt u nieuwe Material themes proberen? Kies ze uit de lijst:</string>
     <string name="cpp_system_language">System language</string>
+    <string name="cpp_missing_permission_title">Toestemming ontbreekt</string>
+    <string name="cpp_missing_permission_msg">Schakel \"%1$s\" toestemming in in systeeminstellingen</string>
 </resources>
diff --git a/app/src/main/res/values-pl/text_imported.xml b/app/src/main/res/values-pl/text_imported.xml
index 420bafba..ae2cc32c 100644
--- a/app/src/main/res/values-pl/text_imported.xml
+++ b/app/src/main/res/values-pl/text_imported.xml
@@ -5,4 +5,5 @@
    <string name="cpp_prefs_language">Język</string>
    <string name="cpp_prefs_theme">Motyw</string>
    <string name="cpp_prefs_keep_screen_on">Pozostaw ekran włączony</string>
+   <string name="cpp_permission_overlay">Wyświetlanie nad innymi aplikacjami</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values-pl/text_strings.xml b/app/src/main/res/values-pl/text_strings.xml
index ead9c2e2..9e10d026 100644
--- a/app/src/main/res/values-pl/text_strings.xml
+++ b/app/src/main/res/values-pl/text_strings.xml
@@ -228,4 +228,6 @@ Proszę, oceń Calculator++ \nna<a href="https://market.android.com/details?id=o
     <string name="cpp_new_in_version">Nowści w wersji %1$s</string>
     <string name="cpp_release_notes_choose_theme">Czy chcesz wypróbować nowe motywy Material? Wybierz je z listy:</string>
     <string name="cpp_system_language">System language</string>
+    <string name="cpp_missing_permission_title">Brak uprawnienia</string>
+    <string name="cpp_missing_permission_msg">Włącz uprawnienie „\"%1$s\"” w ustawieniach systemu</string>
 </resources>
diff --git a/app/src/main/res/values-pt-rBR/text_imported.xml b/app/src/main/res/values-pt-rBR/text_imported.xml
index 937b472d..025efe52 100644
--- a/app/src/main/res/values-pt-rBR/text_imported.xml
+++ b/app/src/main/res/values-pt-rBR/text_imported.xml
@@ -5,4 +5,5 @@
    <string name="cpp_prefs_language">Idioma</string>
    <string name="cpp_prefs_theme">Tema</string>
    <string name="cpp_prefs_keep_screen_on">Permanecer ativo</string>
+   <string name="cpp_permission_overlay">Sobrepor a outros apps</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values-pt-rBR/text_strings.xml b/app/src/main/res/values-pt-rBR/text_strings.xml
index 6848886a..f2f96a7e 100644
--- a/app/src/main/res/values-pt-rBR/text_strings.xml
+++ b/app/src/main/res/values-pt-rBR/text_strings.xml
@@ -224,4 +224,6 @@
     <string name="cpp_new_in_version">Novo na versão %1$s</string>
     <string name="cpp_release_notes_choose_theme">Você deseja testar novos temas? Escolha-os pela lista:</string>
     <string name="cpp_system_language">System language</string>
+    <string name="cpp_missing_permission_title">Sem permissão</string>
+    <string name="cpp_missing_permission_msg">Habilite a permissão de \"%1$s\" nas configurações do sistema</string>
 </resources>
diff --git a/app/src/main/res/values-pt-rPT/text_imported.xml b/app/src/main/res/values-pt-rPT/text_imported.xml
index e47cd050..84dd9990 100644
--- a/app/src/main/res/values-pt-rPT/text_imported.xml
+++ b/app/src/main/res/values-pt-rPT/text_imported.xml
@@ -5,4 +5,5 @@
    <string name="cpp_prefs_language">Idioma</string>
    <string name="cpp_prefs_theme">Tema</string>
    <string name="cpp_prefs_keep_screen_on">Manter ativo</string>
+   <string name="cpp_permission_overlay">Sobrepor a outras aplicações</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values-pt-rPT/text_strings.xml b/app/src/main/res/values-pt-rPT/text_strings.xml
index a57ca624..9ad2c08c 100644
--- a/app/src/main/res/values-pt-rPT/text_strings.xml
+++ b/app/src/main/res/values-pt-rPT/text_strings.xml
@@ -224,4 +224,6 @@
     <string name="cpp_new_in_version">New in %1$s version</string>
     <string name="cpp_release_notes_choose_theme">Do you want to try new Material themes? Choose them from the list:</string>
     <string name="cpp_system_language">System language</string>
+    <string name="cpp_missing_permission_title">Sem permissão</string>
+    <string name="cpp_missing_permission_msg">Por favor active as permissões de \"%1$s\" nas definiçõe de sistema</string>
 </resources>
diff --git a/app/src/main/res/values-ru/text_imported.xml b/app/src/main/res/values-ru/text_imported.xml
index cd5f0f62..f9aee806 100644
--- a/app/src/main/res/values-ru/text_imported.xml
+++ b/app/src/main/res/values-ru/text_imported.xml
@@ -5,4 +5,5 @@
    <string name="cpp_prefs_language">Язык</string>
    <string name="cpp_prefs_theme">Тема</string>
    <string name="cpp_prefs_keep_screen_on">Не выключать экран</string>
+   <string name="cpp_permission_overlay">Наложение поверх других окон</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values-ru/text_strings.xml b/app/src/main/res/values-ru/text_strings.xml
index 58e44fa9..a5191921 100644
--- a/app/src/main/res/values-ru/text_strings.xml
+++ b/app/src/main/res/values-ru/text_strings.xml
@@ -269,4 +269,6 @@
     <string name="cpp_new_in_version">Новое в версии %1$s</string>
     <string name="cpp_release_notes_choose_theme">Хотите попробовать новые темы в стиле Матириал? Выберите их из списка:</string>
     <string name="cpp_system_language">Язык системы</string>
+  <string name="cpp_missing_permission_title">Отсутствует разрешение</string>
+  <string name="cpp_missing_permission_msg">В системных настройках разрешите приложению доступ к следующему компоненту:\"%1$s\"</string>
 </resources>
diff --git a/app/src/main/res/values-tr/text_imported.xml b/app/src/main/res/values-tr/text_imported.xml
index 9f10898e..0bffc4a1 100644
--- a/app/src/main/res/values-tr/text_imported.xml
+++ b/app/src/main/res/values-tr/text_imported.xml
@@ -5,4 +5,5 @@
    <string name="cpp_prefs_language">Dil</string>
    <string name="cpp_prefs_theme">Tema</string>
    <string name="cpp_prefs_keep_screen_on">Uyanık kal</string>
+   <string name="cpp_permission_overlay">Diğer uygl. üzerinde görüntüle</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values-tr/text_strings.xml b/app/src/main/res/values-tr/text_strings.xml
index 0dded81c..bb252fb5 100644
--- a/app/src/main/res/values-tr/text_strings.xml
+++ b/app/src/main/res/values-tr/text_strings.xml
@@ -227,4 +227,6 @@ Google Play</a>,\n yorum yazın yada \n uygulamayı tartışın \non
     <string name="cpp_new_in_version">%1$s sürümünde yeni</string>
     <string name="cpp_release_notes_choose_theme">Yeni materyal temaları denemek istiyor musunuz?Listeden seçin:</string>
     <string name="cpp_system_language">System language</string>
+    <string name="cpp_missing_permission_title">Eksik izin</string>
+    <string name="cpp_missing_permission_msg">\"%1$s\" Sistem ayarlarından izini etkinleştir</string>
 </resources>
diff --git a/app/src/main/res/values-uk/text_strings.xml b/app/src/main/res/values-uk/text_strings.xml
index e5a59d16..dd7fdd81 100644
--- a/app/src/main/res/values-uk/text_strings.xml
+++ b/app/src/main/res/values-uk/text_strings.xml
@@ -240,4 +240,6 @@
     <string name="cpp_new_in_version">Нове у версії %1$s</string>
     <string name="cpp_release_notes_choose_theme">Кортить спробувати нові теми Матеріал? Вибирайте одну з них у списку:</string>
     <string name="cpp_system_language">System language</string>
+  <string name="cpp_missing_permission_title">Бракує дозволу</string>
+  <string name="cpp_missing_permission_msg">Будь ласка, відкрийте доступ до додатка \"%1$s\" у параметрах системи</string>
 </resources>
diff --git a/app/src/main/res/values-vi/text_imported.xml b/app/src/main/res/values-vi/text_imported.xml
index 4fdec80a..3c0cce5e 100644
--- a/app/src/main/res/values-vi/text_imported.xml
+++ b/app/src/main/res/values-vi/text_imported.xml
@@ -5,4 +5,5 @@
    <string name="cpp_prefs_language">Ngôn ngữ</string>
    <string name="cpp_prefs_theme">Chủ đề</string>
    <string name="cpp_prefs_keep_screen_on">Không khóa màn hình</string>
+   <string name="cpp_permission_overlay">Vẽ lên trên ứng dụng khác</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values-vi/text_strings.xml b/app/src/main/res/values-vi/text_strings.xml
index ad6feec1..104858dd 100644
--- a/app/src/main/res/values-vi/text_strings.xml
+++ b/app/src/main/res/values-vi/text_strings.xml
@@ -230,4 +230,6 @@ Qua việc click nút \'Tiếp tục\' bạn được chuyển qua úng dụng G
     <string name="cpp_new_in_version">Mới trong phiên bản %1$s</string>
     <string name="cpp_release_notes_choose_theme">Bạn có muốn thử chủ đề Material mới? Chọn chúng từ danh sách:</string>
     <string name="cpp_system_language">System language</string>
+    <string name="cpp_missing_permission_title">Thiếu quyền</string>
+    <string name="cpp_missing_permission_msg">Vui lòng cho bật \"%1$s\" Quyền trong thiết lập hệ thống</string>
 </resources>
diff --git a/app/src/main/res/values-zh-rCN/text_imported.xml b/app/src/main/res/values-zh-rCN/text_imported.xml
index b57c8a63..cebdfe2e 100644
--- a/app/src/main/res/values-zh-rCN/text_imported.xml
+++ b/app/src/main/res/values-zh-rCN/text_imported.xml
@@ -5,4 +5,5 @@
    <string name="cpp_prefs_language">语言</string>
    <string name="cpp_prefs_theme">主题背景</string>
    <string name="cpp_prefs_keep_screen_on">不锁定屏幕</string>
+   <string name="cpp_permission_overlay">在其他应用的上层显示</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values-zh-rCN/text_strings.xml b/app/src/main/res/values-zh-rCN/text_strings.xml
index e359e7bb..b45f8d3e 100644
--- a/app/src/main/res/values-zh-rCN/text_strings.xml
+++ b/app/src/main/res/values-zh-rCN/text_strings.xml
@@ -227,4 +227,6 @@
     <string name="cpp_new_in_version">%1$s 版本的新功能</string>
     <string name="cpp_release_notes_choose_theme">你想尝试新的Material Design主题吗？请从列表中选择：</string>
     <string name="cpp_system_language">System language</string>
+    <string name="cpp_missing_permission_title">缺失许可</string>
+    <string name="cpp_missing_permission_msg">请在系统设置中启用 \"%1$s\" 许可</string>
 </resources>
diff --git a/app/src/main/res/values-zh-rTW/text_imported.xml b/app/src/main/res/values-zh-rTW/text_imported.xml
index 5b52d938..1abd56de 100644
--- a/app/src/main/res/values-zh-rTW/text_imported.xml
+++ b/app/src/main/res/values-zh-rTW/text_imported.xml
@@ -5,4 +5,5 @@
    <string name="cpp_prefs_language">語言</string>
    <string name="cpp_prefs_theme">主題</string>
    <string name="cpp_prefs_keep_screen_on">螢幕不休眠</string>
+   <string name="cpp_permission_overlay">在其他應用程式上層繪製內容</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values-zh-rTW/text_strings.xml b/app/src/main/res/values-zh-rTW/text_strings.xml
index ecf026be..81059538 100644
--- a/app/src/main/res/values-zh-rTW/text_strings.xml
+++ b/app/src/main/res/values-zh-rTW/text_strings.xml
@@ -230,4 +230,6 @@ Google Play</a>，\n留下評論或是\n討論這個應用程式\n於
     <string name="cpp_new_in_version">%1$s 版本的新功能</string>
     <string name="cpp_release_notes_choose_theme">你想要嘗試新的 Material 主題風格嗎？ 從清單中選擇：</string>
     <string name="cpp_system_language">System language</string>
+    <string name="cpp_missing_permission_title">缺少權限</string>
+    <string name="cpp_missing_permission_msg">請在系統設定中啟用 \"%1$s\" 權限</string>
 </resources>
diff --git a/app/src/main/res/values/text_imported.xml b/app/src/main/res/values/text_imported.xml
index 1aad04eb..8def7aec 100644
--- a/app/src/main/res/values/text_imported.xml
+++ b/app/src/main/res/values/text_imported.xml
@@ -5,4 +5,5 @@
    <string name="cpp_prefs_language">Language</string>
    <string name="cpp_prefs_theme">Theme</string>
    <string name="cpp_prefs_keep_screen_on">Stay awake</string>
+   <string name="cpp_permission_overlay">Draw over other apps</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/text_strings.xml b/app/src/main/res/values/text_strings.xml
index 969f4ed9..f2621e50 100644
--- a/app/src/main/res/values/text_strings.xml
+++ b/app/src/main/res/values/text_strings.xml
@@ -237,4 +237,6 @@
     <string name="cpp_release_notes_choose_theme">Do you want to try new Material themes? Choose them from the list:</string>
     <string name="cpp_dont_show_again">Don\'t show again</string>
     <string name="cpp_system_language">System language</string>
+    <string name="cpp_missing_permission_title">Missing permission</string>
+    <string name="cpp_missing_permission_msg">Please enable \"%1$s\" permission in system settings</string>
 </resources>
diff --git a/app/src/main/res/values/theme.xml b/app/src/main/res/values/theme.xml
index 39d907c4..ef5b791d 100644
--- a/app/src/main/res/values/theme.xml
+++ b/app/src/main/res/values/theme.xml
@@ -40,13 +40,11 @@
         <item name="android:listDivider">@drawable/divider_dark</item>
     </style>
 
-    <style name="Cpp.Theme.Translucent" parent="Cpp.Theme">
+    <style name="Cpp.Theme.Translucent" parent="Cpp.Theme.Dialog">
         <item name="windowActionBar">false</item>
         <item name="windowNoTitle">true</item>
-        <item name="android:windowBackground">@android:color/transparent</item>
-        <item name="android:colorBackgroundCacheHint">@null</item>
+        <item name="android:windowNoTitle">true</item>
         <item name="android:windowIsTranslucent">true</item>
-        <item name="android:windowAnimationStyle">@android:style/Animation.Dialog</item>
     </style>
 
     <style name="Cpp.Theme.Dialog" parent="@style/Theme.AppCompat.Dialog">
diff --git a/app/src/main/res/values/theme_material.xml b/app/src/main/res/values/theme_material.xml
index b1e06459..50d8604a 100644
--- a/app/src/main/res/values/theme_material.xml
+++ b/app/src/main/res/values/theme_material.xml
@@ -69,9 +69,7 @@
     <style name="Cpp.Theme.Material.Dialog" parent="Cpp.Theme.Dialog">
         <item name="cpp_button_style_digit">@style/CppKeyboardButton.Material.Digit</item>
         <item name="cpp_button_style_control">@style/CppKeyboardButton.Material.Digit</item>
-        <item name="cpp_button_style_control_image">
-            @style/CppKeyboardButton.Material.Control.Image
-        </item>
+        <item name="cpp_button_style_control_image">@style/CppKeyboardButton.Material.Control.Image</item>
         <item name="cpp_button_style_operation">@style/CppKeyboardButton.Material.Operation</item>
     </style>
 
diff --git a/translations/src/main/java/org/solovyev/android/translations/Android.java b/translations/src/main/java/org/solovyev/android/translations/Android.java
index de3b1118..4a67d2e6 100644
--- a/translations/src/main/java/org/solovyev/android/translations/Android.java
+++ b/translations/src/main/java/org/solovyev/android/translations/Android.java
@@ -31,6 +31,7 @@ public class Android {
         translationLinks.add(new TranslationLink("phone_language", "cpp_prefs_language"));
         translationLinks.add(new TranslationLink("night_mode_title", "cpp_prefs_theme"));
         translationLinks.add(new TranslationLink("keep_screen_on", "cpp_prefs_keep_screen_on"));
+        translationLinks.add(new TranslationLink("draw_overlay", "cpp_permission_overlay"));
 
         List<String> languageLocales = new ArrayList<>(Utils.languageLocales);
         languageLocales.add("");