diff --git a/app/src/main/java/org/solovyev/android/calculator/ActivityUi.java b/app/src/main/java/org/solovyev/android/calculator/ActivityUi.java
index 12bc2951..240b4b8f 100644
--- a/app/src/main/java/org/solovyev/android/calculator/ActivityUi.java
+++ b/app/src/main/java/org/solovyev/android/calculator/ActivityUi.java
@@ -50,7 +50,7 @@ import javax.annotation.Nullable;
 
 public class ActivityUi extends BaseUi {
 
-    private int layoutId;
+    private final int layoutId;
 
     @Nonnull
     private Preferences.Gui.Theme theme = Preferences.Gui.Theme.material_theme;
@@ -267,10 +267,6 @@ public class ActivityUi extends BaseUi {
         }
     }
 
-    public void setLayoutId(int layoutId) {
-        this.layoutId = layoutId;
-    }
-
     @Nonnull
     public Language getLanguage() {
         return language;
diff --git a/app/src/main/java/org/solovyev/android/calculator/BaseActivity.java b/app/src/main/java/org/solovyev/android/calculator/BaseActivity.java
index 82a7696c..6bf4fe2a 100644
--- a/app/src/main/java/org/solovyev/android/calculator/BaseActivity.java
+++ b/app/src/main/java/org/solovyev/android/calculator/BaseActivity.java
@@ -18,16 +18,12 @@ public class BaseActivity extends AppCompatActivity {
     @Nonnull
     protected final ActivityUi ui;
 
-    public BaseActivity(@Nonnull ActivityUi ui) {
-        this.ui = ui;
+    public BaseActivity() {
+        this(R.layout.main_empty);
     }
 
     public BaseActivity(@LayoutRes int layout) {
-        this(layout, "Activity");
-    }
-
-    public BaseActivity(@LayoutRes int layout, @Nonnull String logTag) {
-        this.ui = new ActivityUi(layout, logTag);
+        this.ui = new ActivityUi(layout, getClass().getSimpleName());
     }
 
     @Nonnull
diff --git a/app/src/main/java/org/solovyev/android/calculator/CalculatorActivity.java b/app/src/main/java/org/solovyev/android/calculator/CalculatorActivity.java
index 7bfc528b..ccd6ca26 100644
--- a/app/src/main/java/org/solovyev/android/calculator/CalculatorActivity.java
+++ b/app/src/main/java/org/solovyev/android/calculator/CalculatorActivity.java
@@ -62,8 +62,6 @@ import static org.solovyev.android.wizard.WizardUi.*;
 
 public class CalculatorActivity extends BaseActivity implements SharedPreferences.OnSharedPreferenceChangeListener, Toolbar.OnMenuItemClickListener {
 
-    @Nonnull
-    public static final String TAG = CalculatorActivity.class.getSimpleName();
     @Inject
     PreferredPreferences preferredPreferences;
     @Inject
@@ -89,7 +87,7 @@ public class CalculatorActivity extends BaseActivity implements SharedPreference
     private boolean useBackAsPrev;
 
     public CalculatorActivity() {
-        super(0, TAG);
+        super(R.layout.activity_main);
     }
 
     private static void firstTimeInit(@Nonnull SharedPreferences preferences, @Nonnull Context context) {
@@ -163,8 +161,6 @@ public class CalculatorActivity extends BaseActivity implements SharedPreference
 
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
-        ui.setLayoutId(R.layout.activity_main);
-
         super.onCreate(savedInstanceState);
 
         ButterKnife.bind(this);
diff --git a/app/src/main/java/org/solovyev/android/calculator/EmptyActivity.java b/app/src/main/java/org/solovyev/android/calculator/EmptyActivity.java
deleted file mode 100644
index e027d2b0..00000000
--- a/app/src/main/java/org/solovyev/android/calculator/EmptyActivity.java
+++ /dev/null
@@ -1,34 +0,0 @@
-/*
- * Copyright 2013 serso aka se.solovyev
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- * Contact details
- *
- * Email: se.solovyev@gmail.com
- * Site:  http://se.solovyev.org
- */
-
-package org.solovyev.android.calculator;
-
-public abstract class EmptyActivity extends BaseActivity {
-
-    protected EmptyActivity() {
-        this(R.layout.main_empty);
-    }
-
-    protected EmptyActivity(int layoutResId) {
-        super(layoutResId);
-    }
-}
diff --git a/app/src/main/java/org/solovyev/android/calculator/about/AboutActivity.java b/app/src/main/java/org/solovyev/android/calculator/about/AboutActivity.java
index cd1b1c3b..c1c542fe 100644
--- a/app/src/main/java/org/solovyev/android/calculator/about/AboutActivity.java
+++ b/app/src/main/java/org/solovyev/android/calculator/about/AboutActivity.java
@@ -23,14 +23,13 @@
 package org.solovyev.android.calculator.about;
 
 import android.os.Bundle;
-
+import org.solovyev.android.calculator.BaseActivity;
 import org.solovyev.android.calculator.FragmentTab;
-import org.solovyev.android.calculator.EmptyActivity;
 import org.solovyev.android.calculator.R;
 
 import javax.annotation.Nullable;
 
-public class AboutActivity extends EmptyActivity {
+public class AboutActivity extends BaseActivity {
 
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
diff --git a/app/src/main/java/org/solovyev/android/calculator/functions/FunctionsActivity.java b/app/src/main/java/org/solovyev/android/calculator/functions/FunctionsActivity.java
index 5b6e2c55..2c9be49f 100644
--- a/app/src/main/java/org/solovyev/android/calculator/functions/FunctionsActivity.java
+++ b/app/src/main/java/org/solovyev/android/calculator/functions/FunctionsActivity.java
@@ -34,10 +34,6 @@ public class FunctionsActivity extends BaseActivity {
 
     public static final String EXTRA_FUNCTION = "function";
 
-    public FunctionsActivity() {
-        super(R.layout.main_empty, FunctionsActivity.class.getSimpleName());
-    }
-
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
diff --git a/app/src/main/java/org/solovyev/android/calculator/history/HistoryActivity.java b/app/src/main/java/org/solovyev/android/calculator/history/HistoryActivity.java
index 0c25a186..cc90e591 100644
--- a/app/src/main/java/org/solovyev/android/calculator/history/HistoryActivity.java
+++ b/app/src/main/java/org/solovyev/android/calculator/history/HistoryActivity.java
@@ -34,10 +34,6 @@ import static org.solovyev.android.calculator.FragmentTab.saved_history;
 
 public class HistoryActivity extends BaseActivity {
 
-    public HistoryActivity() {
-        super(R.layout.main_empty, HistoryActivity.class.getSimpleName());
-    }
-
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
diff --git a/app/src/main/java/org/solovyev/android/calculator/matrix/CalculatorMatrixActivity.java b/app/src/main/java/org/solovyev/android/calculator/matrix/CalculatorMatrixActivity.java
index 1577f29f..eb5afa0a 100644
--- a/app/src/main/java/org/solovyev/android/calculator/matrix/CalculatorMatrixActivity.java
+++ b/app/src/main/java/org/solovyev/android/calculator/matrix/CalculatorMatrixActivity.java
@@ -23,19 +23,13 @@
 package org.solovyev.android.calculator.matrix;
 
 import android.os.Bundle;
-
+import org.solovyev.android.calculator.BaseActivity;
 import org.solovyev.android.calculator.FragmentTab;
-import org.solovyev.android.calculator.EmptyActivity;
 import org.solovyev.android.calculator.R;
 
 import static android.support.v7.app.ActionBar.NAVIGATION_MODE_STANDARD;
 
-/**
- * User: Solovyev_S
- * Date: 12.10.12
- * Time: 10:56
- */
-public class CalculatorMatrixActivity extends EmptyActivity {
+public class CalculatorMatrixActivity extends BaseActivity {
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
diff --git a/app/src/main/java/org/solovyev/android/calculator/operators/OperatorsActivity.java b/app/src/main/java/org/solovyev/android/calculator/operators/OperatorsActivity.java
index 6e6a4f55..0dfbc39c 100644
--- a/app/src/main/java/org/solovyev/android/calculator/operators/OperatorsActivity.java
+++ b/app/src/main/java/org/solovyev/android/calculator/operators/OperatorsActivity.java
@@ -25,16 +25,11 @@ package org.solovyev.android.calculator.operators;
 import android.os.Bundle;
 import org.solovyev.android.calculator.BaseActivity;
 import org.solovyev.android.calculator.FragmentTab;
-import org.solovyev.android.calculator.R;
 
 import javax.annotation.Nullable;
 
 public class OperatorsActivity extends BaseActivity {
 
-    public OperatorsActivity() {
-        super(R.layout.main_empty, OperatorsActivity.class.getSimpleName());
-    }
-
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
diff --git a/app/src/main/java/org/solovyev/android/calculator/variables/VariablesActivity.java b/app/src/main/java/org/solovyev/android/calculator/variables/VariablesActivity.java
index 01c7ccee..c79c2bff 100644
--- a/app/src/main/java/org/solovyev/android/calculator/variables/VariablesActivity.java
+++ b/app/src/main/java/org/solovyev/android/calculator/variables/VariablesActivity.java
@@ -25,7 +25,6 @@ package org.solovyev.android.calculator.variables;
 import android.os.Bundle;
 import org.solovyev.android.calculator.BaseActivity;
 import org.solovyev.android.calculator.FragmentTab;
-import org.solovyev.android.calculator.R;
 
 import javax.annotation.Nullable;
 
@@ -33,10 +32,6 @@ public class VariablesActivity extends BaseActivity {
 
     public static final String EXTRA_VARIABLE = "variable";
 
-    public VariablesActivity() {
-        super(R.layout.main_empty, VariablesActivity.class.getSimpleName());
-    }
-
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);