diff --git a/.idea/misc.xml b/.idea/misc.xml
index 703e5d4..af0bbdd 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -5,7 +5,7 @@
       <configuration PROFILE_NAME="Debug" CONFIG_NAME="Debug" />
     </configurations>
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <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/backdrop/build.gradle b/backdrop/build.gradle
index 323c21d..febd53c 100644
--- a/backdrop/build.gradle
+++ b/backdrop/build.gradle
@@ -23,6 +23,10 @@ android {
         }
     }
 
+    kotlinOptions {
+        jvmTarget = JavaVersion.VERSION_1_8
+    }
+
 }
 
 dependencies {
@@ -30,4 +34,5 @@ dependencies {
     implementation deps.android.drawableToolbox
     implementation deps.kotlin.kotlin_jre
     implementation deps.android.appcompat
+    implementation deps.android.androidx_core
 }
diff --git a/backdrop/src/main/java/com/roacult/backdrop/BackdropLayout.kt b/backdrop/src/main/java/com/roacult/backdrop/BackdropLayout.kt
index af399e8..a5266c1 100644
--- a/backdrop/src/main/java/com/roacult/backdrop/BackdropLayout.kt
+++ b/backdrop/src/main/java/com/roacult/backdrop/BackdropLayout.kt
@@ -11,6 +11,7 @@ import android.util.Log
 import android.view.View
 import android.widget.FrameLayout
 import androidx.appcompat.widget.Toolbar
+import androidx.core.view.isVisible
 import top.defaults.drawabletoolbox.DrawableBuilder
 
 class BackdropLayout @JvmOverloads constructor(context: Context, attribute : AttributeSet? = null, defStyleAttr: Int = 0)
@@ -140,7 +141,7 @@ class BackdropLayout @JvmOverloads constructor(context: Context, attribute : Att
                     if(disableWhenOpened) {
                         getDisablingView().translationY = transitionHeight
                         getDisablingView().alpha = calculateAlphaVlue(transitionHeight)
-                        getDisablingView().visible(true)
+                        getDisablingView().isVisible = true
                     }
                 }
             }
@@ -153,7 +154,7 @@ class BackdropLayout @JvmOverloads constructor(context: Context, attribute : Att
                     if(disableWhenOpened) {
                         getDisablingView().translationY = 0F
                         getDisablingView().alpha = 0F
-                        getDisablingView().visible(false)
+                        getDisablingView().isVisible = false
                     }
                 }
             }
@@ -230,7 +231,7 @@ class BackdropLayout @JvmOverloads constructor(context: Context, attribute : Att
                 val translation = it.animatedValue as Float
                 getFrontLayout().translationY = translation
                 if(disableWhenOpened) {
-                    getDisablingView().visible(translation != 0F)
+                    getDisablingView().isVisible = translation != 0F
                     getDisablingView().translationY = translation
                     getDisablingView().alpha = calculateAlphaVlue(translation)
                 }
diff --git a/backdrop/src/main/java/com/roacult/backdrop/Utils.kt b/backdrop/src/main/java/com/roacult/backdrop/Utils.kt
deleted file mode 100644
index 4700f4a..0000000
--- a/backdrop/src/main/java/com/roacult/backdrop/Utils.kt
+++ /dev/null
@@ -1,7 +0,0 @@
-package com.roacult.backdrop
-
-import android.view.View
-
-fun View.visible(show: Boolean) {
-    visibility = if (show) View.VISIBLE else View.GONE
-}
\ No newline at end of file
diff --git a/versions.gradle b/versions.gradle
index a130e1e..8eebc62 100644
--- a/versions.gradle
+++ b/versions.gradle
@@ -16,6 +16,7 @@ ext.deps = [:]
 //pairs below
 
 def versions = [:]
+versions.androidx = "1.3.1"
 versions.espresso = "3.1.0"
 versions.mockito = "2.13.0"
 versions.junit = "5.1.1"
@@ -72,6 +73,7 @@ android.fragment = "androidx.fragment:fragment:$versions.appcompat"
 android.recyclerview = "androidx.recyclerview:recyclerview:$versions.appcompat"
 android.design = "com.google.android.material:material:$versions.design"
 android.constraint_layout = "androidx.constraintlayout:constraintlayout:$versions.constraint_layout"
+android.androidx_core = "androidx.core:core-ktx:$versions.androidx"
 android.lifecycle_extensions = "androidx.lifecycle:lifecycle-extensions:$versions.lifecycle"
 android.ktx_fragment = "androidx.fragment:fragment-ktx:$versions.ktx_fragment"
 android.picasso = "com.squareup.picasso:picasso:$versions.picasso_version"
@@ -180,7 +182,7 @@ deps.rxJava = rxjava
 
 def build_versions = [:]
 build_versions.min_sdk = 16
-build_versions.target_sdk = 28
+build_versions.target_sdk = 29
 ext.build_versions = build_versions
 
 deps.android_gradle_plugin = "com.android.tools.build:gradle:$versions.android_gradle_plugin"