diff --git a/.idea/gradle.xml b/.idea/gradle.xml
index 6f06b8f..2f83b1b 100644
--- a/.idea/gradle.xml
+++ b/.idea/gradle.xml
@@ -3,6 +3,9 @@
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>
+        <compositeConfiguration>
+          <compositeBuild compositeDefinitionSource="SCRIPT" />
+        </compositeConfiguration>
         <option name="distributionType" value="DEFAULT_WRAPPED" />
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
         <option name="modules">
@@ -13,6 +16,7 @@
           </set>
         </option>
         <option name="resolveModulePerSourceSet" value="false" />
+        <option name="testRunner" value="PLATFORM" />
       </GradleProjectSettings>
     </option>
   </component>
diff --git a/build.gradle b/build.gradle
index da3bf81..c71c4ef 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,9 +5,10 @@ buildscript {
     repositories {
         maven { url 'https://maven.google.com' }
         jcenter()
+        google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.2.0-rc01'
+        classpath 'com.android.tools.build:gradle:3.5.0'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/expandablelib/src/main/java/iammert/com/expandablelib/ExpandableLayout.java b/expandablelib/src/main/java/iammert/com/expandablelib/ExpandableLayout.java
index 02b9af7..cb4f479 100644
--- a/expandablelib/src/main/java/iammert/com/expandablelib/ExpandableLayout.java
+++ b/expandablelib/src/main/java/iammert/com/expandablelib/ExpandableLayout.java
@@ -51,6 +51,8 @@ public boolean apply(Object obj) {
 
     private List<Section> sections;
 
+    private Boolean singleMode;
+
     private ExpandCollapseListener.ExpandListener expandListener;
 
     private ExpandCollapseListener.CollapseListener collapseListener;
@@ -86,6 +88,7 @@ private void init(Context context, AttributeSet attributeSet) {
             typedArray = context.obtainStyledAttributes(attributeSet, R.styleable.ExpandableLayout);
             parentLayout = typedArray.getResourceId(R.styleable.ExpandableLayout_parentLayout, NO_RES);
             childLayout = typedArray.getResourceId(R.styleable.ExpandableLayout_childLayout, NO_RES);
+            singleMode = typedArray.getBoolean(R.styleable.ExpandableLayout_singleMode, false);
             layoutInflater = LayoutInflater.from(context);
         } finally {
             if (typedArray != null) {
@@ -257,8 +260,8 @@ private <P> void expand(@NonNull P parent) {
                 sections.get(i).expanded = true;
                 if (expandListener != null)
                     expandListener.onExpanded(i, sections.get(i).parent, sectionView.getChildAt(0));
-                break;
-            }
+            }else if (singleMode)
+                collapse(sections.get(i).parent);
         }
     }
 
diff --git a/expandablelib/src/main/res/values/attrs.xml b/expandablelib/src/main/res/values/attrs.xml
index f08f4ca..912f8e7 100644
--- a/expandablelib/src/main/res/values/attrs.xml
+++ b/expandablelib/src/main/res/values/attrs.xml
@@ -4,6 +4,7 @@
     <declare-styleable name="ExpandableLayout">
         <attr name="parentLayout" format="integer" />
         <attr name="childLayout" format="integer" />
+        <attr name="singleMode" format="boolean" />
     </declare-styleable>
 
 </resources>
\ No newline at end of file
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 6d9dbc2..c81e7b2 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Thu Aug 23 14:26:53 CDT 2018
+#Thu Sep 05 15:20:37 EET 2019
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.9-rc-1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip