First

app/src/main/AndroidManifest.xml

@@ -41,7 +41,7 @@
             android:label="@string/title_activity_resource_list"
             android:theme="@style/FullscreenTheme" />
         <activity
-            android:name="app.brest.app.brest.ui.MenuActivity"
+            android:name=".MenuActivity"
             android:label="@string/title_activity_menu"
             android:theme="@style/AppTheme.NoActionBar"></activity>
     </application>

app/src/main/java/app/brest/app/brest/ui/MenuActivity.java → app/src/main/java/app/brest/testmin3d/MenuActivity.java

@@ -1,4 +1,4 @@
-package app.brest.app.brest.ui;
+package app.brest.testmin3d;
 
 import android.os.Bundle;
 import android.support.design.widget.FloatingActionButton;

app/src/main/res/layout/activity_menu.xml

@@ -5,7 +5,7 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:fitsSystemWindows="true"
-    tools:context="app.brest.app.brest.ui.MenuActivity">
+    tools:context=".MenuActivity">
 
     <android.support.design.widget.AppBarLayout
         android:layout_width="match_parent"

app/src/main/res/layout/content_menu.xml

@@ -9,7 +9,7 @@
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     app:layout_behavior="@string/appbar_scrolling_view_behavior"
-    tools:context="app.brest.app.brest.ui.MenuActivity"
+    tools:context=".MenuActivity"
     tools:showIn="@layout/activity_menu">
 
 </RelativeLayout>