diff --git a/.idea/caches/build_file_checksums.ser b/.idea/caches/build_file_checksums.ser
new file mode 100644
index 0000000..513b456
Binary files /dev/null and b/.idea/caches/build_file_checksums.ser differ
diff --git a/.idea/gradle.xml b/.idea/gradle.xml
index 76a4349..7ac24c7 100644
--- a/.idea/gradle.xml
+++ b/.idea/gradle.xml
@@ -5,6 +5,12 @@
       <GradleProjectSettings>
         <option name="distributionType" value="DEFAULT_WRAPPED" />
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="modules">
+          <set>
+            <option value="$PROJECT_DIR$" />
+            <option value="$PROJECT_DIR$/app" />
+          </set>
+        </option>
         <option name="resolveModulePerSourceSet" value="false" />
       </GradleProjectSettings>
     </option>
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 4872587..e0d5b93 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,6 +1,35 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager">
+  <component name="NullableNotNullManager">
+    <option name="myDefaultNullable" value="android.support.annotation.Nullable" />
+    <option name="myDefaultNotNull" value="android.support.annotation.NonNull" />
+    <option name="myNullables">
+      <value>
+        <list size="7">
+          <item index="0" class="java.lang.String" itemvalue="org.jetbrains.annotations.Nullable" />
+          <item index="1" class="java.lang.String" itemvalue="javax.annotation.Nullable" />
+          <item index="2" class="java.lang.String" itemvalue="javax.annotation.CheckForNull" />
+          <item index="3" class="java.lang.String" itemvalue="edu.umd.cs.findbugs.annotations.Nullable" />
+          <item index="4" class="java.lang.String" itemvalue="android.support.annotation.Nullable" />
+          <item index="5" class="java.lang.String" itemvalue="androidx.annotation.Nullable" />
+          <item index="6" class="java.lang.String" itemvalue="androidx.annotation.RecentlyNullable" />
+        </list>
+      </value>
+    </option>
+    <option name="myNotNulls">
+      <value>
+        <list size="6">
+          <item index="0" class="java.lang.String" itemvalue="org.jetbrains.annotations.NotNull" />
+          <item index="1" class="java.lang.String" itemvalue="javax.annotation.Nonnull" />
+          <item index="2" class="java.lang.String" itemvalue="edu.umd.cs.findbugs.annotations.NonNull" />
+          <item index="3" class="java.lang.String" itemvalue="android.support.annotation.NonNull" />
+          <item index="4" class="java.lang.String" itemvalue="androidx.annotation.NonNull" />
+          <item index="5" class="java.lang.String" itemvalue="androidx.annotation.RecentlyNonNull" />
+        </list>
+      </value>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_7" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..35eb1dd
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 2553f43..06a8215 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -16,10 +16,11 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
+    buildToolsVersion '27.0.3'
 }
 
 dependencies {
-    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation fileTree(include: ['*.jar'], dir: 'libs')
     implementation 'com.android.support:appcompat-v7:27.1.1'
     implementation 'com.android.support:design:27.1.1'
     implementation 'com.android.support.constraint:constraint-layout:1.1.3'
diff --git a/app/src/main/java/ru/volgorobot/vrcatalog/SettingsActivity.java b/app/src/main/java/ru/volgorobot/vrcatalog/SettingsActivity.java
index 65f08c0..928ab76 100644
--- a/app/src/main/java/ru/volgorobot/vrcatalog/SettingsActivity.java
+++ b/app/src/main/java/ru/volgorobot/vrcatalog/SettingsActivity.java
@@ -2,19 +2,22 @@ package ru.volgorobot.vrcatalog;
 
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
+import android.support.v7.app.AppCompatDelegate;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.preference.PreferenceActivity;
 
 public class SettingsActivity extends PreferenceActivity {
 
+    private AppCompatDelegate mDelegate;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         addPreferencesFromResource(R.xml.activity_settings);
 
-        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
-        getSupportActionBar().setHomeButtonEnabled(true);
+        //getActionBar().setDisplayHomeAsUpEnabled(true);
+        //getActionBar().setHomeButtonEnabled(true);
     }
 
     @Override
@@ -32,4 +35,6 @@ public class SettingsActivity extends PreferenceActivity {
         }
         return super.onOptionsItemSelected(item);
     }
+
+    
 }