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 3ab3a4f2..6e2c4ffe 100644
--- a/app/src/main/java/org/solovyev/android/calculator/App.java
+++ b/app/src/main/java/org/solovyev/android/calculator/App.java
@@ -363,4 +363,17 @@ public final class App {
         }
         return null;
     }
+
+    @NonNull
+    public static CalculatorApplication cast(@NonNull Context context) {
+        if (context instanceof CalculatorApplication) {
+            return (CalculatorApplication) context;
+        }
+        final Context appContext = context.getApplicationContext();
+        if (appContext instanceof CalculatorApplication) {
+            return (CalculatorApplication) appContext;
+        }
+        Check.shouldNotHappen();
+        return (CalculatorApplication) application;
+    }
 }
\ No newline at end of file
diff --git a/app/src/main/java/org/solovyev/android/calculator/AppComponent.java b/app/src/main/java/org/solovyev/android/calculator/AppComponent.java
index 5b0fc552..85f4bff0 100644
--- a/app/src/main/java/org/solovyev/android/calculator/AppComponent.java
+++ b/app/src/main/java/org/solovyev/android/calculator/AppComponent.java
@@ -1,6 +1,5 @@
 package org.solovyev.android.calculator;
 
-import dagger.Component;
 import org.solovyev.android.calculator.errors.FixableErrorFragment;
 import org.solovyev.android.calculator.errors.FixableErrorsActivity;
 import org.solovyev.android.calculator.functions.EditFunctionFragment;
@@ -14,6 +13,8 @@ import org.solovyev.android.calculator.variables.VariablesFragment;
 
 import javax.inject.Singleton;
 
+import dagger.Component;
+
 @Singleton
 @Component(modules = AppModule.class)
 public interface AppComponent {
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 50c18e88..57892cf7 100644
--- a/app/src/main/java/org/solovyev/android/calculator/BaseActivity.java
+++ b/app/src/main/java/org/solovyev/android/calculator/BaseActivity.java
@@ -12,6 +12,8 @@ import org.solovyev.android.calculator.entities.Category;
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
+import static org.solovyev.android.calculator.App.cast;
+
 public class BaseActivity extends AppCompatActivity {
 
     @Nonnull
@@ -38,7 +40,7 @@ public class BaseActivity extends AppCompatActivity {
     protected void onCreate(Bundle savedInstanceState) {
         ui.onPreCreate(this);
         super.onCreate(savedInstanceState);
-        inject(((CalculatorApplication) getApplication()).getComponent());
+        inject(cast(getApplication()).getComponent());
         ui.onCreate(this);
     }
 
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 cb39cf76..bcc17355 100644
--- a/app/src/main/java/org/solovyev/android/calculator/BaseDialogFragment.java
+++ b/app/src/main/java/org/solovyev/android/calculator/BaseDialogFragment.java
@@ -17,6 +17,8 @@ import android.view.inputmethod.InputMethodManager;
 
 import javax.inject.Inject;
 
+import static org.solovyev.android.calculator.App.cast;
+
 public abstract class BaseDialogFragment extends DialogFragment {
 
     @Inject
@@ -25,7 +27,7 @@ public abstract class BaseDialogFragment extends DialogFragment {
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        inject(((CalculatorApplication) getActivity().getApplication()).getComponent());
+        inject(cast(getActivity().getApplication()).getComponent());
     }
 
     protected void inject(@NonNull AppComponent component) {
diff --git a/app/src/main/java/org/solovyev/android/calculator/BaseFragment.java b/app/src/main/java/org/solovyev/android/calculator/BaseFragment.java
index 8b537952..c478c11a 100644
--- a/app/src/main/java/org/solovyev/android/calculator/BaseFragment.java
+++ b/app/src/main/java/org/solovyev/android/calculator/BaseFragment.java
@@ -8,6 +8,7 @@ import android.view.*;
 import javax.annotation.Nonnull;
 
 import static android.view.Menu.NONE;
+import static org.solovyev.android.calculator.App.cast;
 
 public abstract class BaseFragment extends Fragment {
 
@@ -21,7 +22,7 @@ public abstract class BaseFragment extends Fragment {
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        inject(((CalculatorApplication) getActivity().getApplication()).getComponent());
+        inject(cast(getActivity().getApplication()).getComponent());
         ui.onCreate(this);
     }
 
diff --git a/app/src/main/java/org/solovyev/android/calculator/BaseUi.java b/app/src/main/java/org/solovyev/android/calculator/BaseUi.java
index 9ff49469..38d8238a 100644
--- a/app/src/main/java/org/solovyev/android/calculator/BaseUi.java
+++ b/app/src/main/java/org/solovyev/android/calculator/BaseUi.java
@@ -51,6 +51,7 @@ import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import static org.solovyev.android.calculator.App.cast;
 import static org.solovyev.android.calculator.Preferences.Gui.Layout.simple;
 import static org.solovyev.android.calculator.Preferences.Gui.Layout.simple_mobile;
 import static org.solovyev.android.calculator.Engine.Preferences.angleUnit;
@@ -129,7 +130,7 @@ public abstract class BaseUi implements SharedPreferences.OnSharedPreferenceChan
     PreferredPreferences preferredPreferences;
 
     protected void onCreate(@Nonnull Activity activity) {
-        ((CalculatorApplication) activity.getApplication()).getComponent().inject(this);
+        cast(activity.getApplication()).getComponent().inject(this);
 
         layout = Preferences.Gui.layout.getPreferenceNoError(preferences);
         theme = Preferences.Gui.theme.getPreferenceNoError(preferences);
diff --git a/app/src/main/java/org/solovyev/android/calculator/CalculatorEditorFragment.java b/app/src/main/java/org/solovyev/android/calculator/CalculatorEditorFragment.java
index dcea4e87..9dbee527 100644
--- a/app/src/main/java/org/solovyev/android/calculator/CalculatorEditorFragment.java
+++ b/app/src/main/java/org/solovyev/android/calculator/CalculatorEditorFragment.java
@@ -40,6 +40,8 @@ import org.solovyev.android.menu.ListActivityMenu;
 import javax.annotation.Nonnull;
 import javax.inject.Inject;
 
+import static org.solovyev.android.calculator.App.cast;
+
 public class CalculatorEditorFragment extends Fragment {
 
     private FragmentUi fragmentUi;
@@ -77,7 +79,7 @@ public class CalculatorEditorFragment extends Fragment {
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
-        ((CalculatorApplication) getActivity().getApplication()).getComponent().inject(this);
+        cast(getActivity().getApplication()).getComponent().inject(this);
 
         final Preferences.Gui.Layout layout = Preferences.Gui.getLayout(preferences);
         if (!layout.optimized) {
diff --git a/app/src/main/java/org/solovyev/android/calculator/errors/FixableErrorsActivity.java b/app/src/main/java/org/solovyev/android/calculator/errors/FixableErrorsActivity.java
index 0a3c5a81..837192ff 100644
--- a/app/src/main/java/org/solovyev/android/calculator/errors/FixableErrorsActivity.java
+++ b/app/src/main/java/org/solovyev/android/calculator/errors/FixableErrorsActivity.java
@@ -29,16 +29,19 @@ import android.os.Bundle;
 import android.preference.PreferenceManager;
 import android.support.v4.app.Fragment;
 import android.support.v7.app.AppCompatActivity;
+
 import org.solovyev.android.Activities;
-import org.solovyev.android.calculator.CalculatorApplication;
 import org.solovyev.android.calculator.Preferences;
 import org.solovyev.common.msg.Message;
 
-import javax.annotation.Nonnull;
-import javax.inject.Inject;
 import java.util.ArrayList;
 import java.util.List;
 
+import javax.annotation.Nonnull;
+import javax.inject.Inject;
+
+import static org.solovyev.android.calculator.App.cast;
+
 public class FixableErrorsActivity extends AppCompatActivity {
 
     public static final String EXTRA_ERRORS = "errors";
@@ -81,7 +84,7 @@ public class FixableErrorsActivity extends AppCompatActivity {
             finish();
             return;
         }
-        ((CalculatorApplication) getApplication()).getComponent().inject(this);
+        cast(getApplication()).getComponent().inject(this);
         if (state == null) {
             showNextError();
         }
diff --git a/app/src/main/java/org/solovyev/android/calculator/onscreen/CalculatorOnscreenService.java b/app/src/main/java/org/solovyev/android/calculator/onscreen/CalculatorOnscreenService.java
index 513515f7..11770e93 100644
--- a/app/src/main/java/org/solovyev/android/calculator/onscreen/CalculatorOnscreenService.java
+++ b/app/src/main/java/org/solovyev/android/calculator/onscreen/CalculatorOnscreenService.java
@@ -39,7 +39,6 @@ import com.squareup.otto.Subscribe;
 import org.solovyev.android.Check;
 import org.solovyev.android.Views;
 import org.solovyev.android.calculator.App;
-import org.solovyev.android.calculator.CalculatorApplication;
 import org.solovyev.android.calculator.Display;
 import org.solovyev.android.calculator.Editor;
 import org.solovyev.android.calculator.Preferences;
@@ -49,6 +48,8 @@ import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import static org.solovyev.android.calculator.App.cast;
+
 public class CalculatorOnscreenService extends Service implements OnscreenViewListener, SharedPreferences.OnSharedPreferenceChangeListener {
 
     public static final Class<CalculatorOnscreenBroadcastReceiver> INTENT_LISTENER_CLASS = CalculatorOnscreenBroadcastReceiver.class;
@@ -126,7 +127,7 @@ public class CalculatorOnscreenService extends Service implements OnscreenViewLi
     @Override
     public void onCreate() {
         super.onCreate();
-        ((CalculatorApplication) getApplication()).getComponent().inject(this);
+        cast(getApplication()).getComponent().inject(this);
     }
 
     @Override