diff --git a/androidveil/build.gradle b/androidveil/build.gradle
index a75d906..742e611 100644
--- a/androidveil/build.gradle
+++ b/androidveil/build.gradle
@@ -12,19 +12,35 @@ android {
     versionCode versions.versionCode
     versionName versions.versionName
   }
+
+  resourcePrefix "veil"
+
   buildFeatures {
     buildConfig false
     viewBinding true
   }
+
+  compileOptions {
+    sourceCompatibility JavaVersion.VERSION_1_8
+    targetCompatibility JavaVersion.VERSION_1_8
+  }
+
+  kotlinOptions {
+    jvmTarget = "1.8"
+  }
+
+  lintOptions {
+    abortOnError false
+  }
 }
 
 apiValidation {
-  ignoredPackages += [
-      "com/skydoves/androidveil/databinding",
-  ]
-  nonPublicMarkers += [
-      "kotlin.PublishedApi",
-  ]
+  ignoredPackages += ["com/skydoves/androidveil/databinding"]
+  nonPublicMarkers += ["kotlin.PublishedApi"]
+}
+
+tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).all {
+  kotlinOptions.freeCompilerArgs += ["-Xexplicit-api=strict"]
 }
 
 dependencies {
@@ -33,5 +49,4 @@ dependencies {
   api "com.facebook.shimmer:shimmer:$versions.shimmer"
 }
 
-apply plugin: "com.vanniktech.maven.publish"
-apply from: '../spotless.gradle'
\ No newline at end of file
+apply plugin: "com.vanniktech.maven.publish"
\ No newline at end of file
diff --git a/androidveil/src/main/AndroidManifest.xml b/androidveil/src/main/AndroidManifest.xml
index 5a50619..ecce34f 100644
--- a/androidveil/src/main/AndroidManifest.xml
+++ b/androidveil/src/main/AndroidManifest.xml
@@ -1 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    Designed and developed by 2018 skydoves (Jaewoong Eum)
+
+    Licensed under the Stream License;
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
 <manifest package="com.skydoves.androidveil" />
diff --git a/androidveil/src/main/java/com/skydoves/androidveil/ResourceExtension.kt b/androidveil/src/main/java/com/skydoves/androidveil/ResourceExtension.kt
index 25abb6d..ac25515 100644
--- a/androidveil/src/main/java/com/skydoves/androidveil/ResourceExtension.kt
+++ b/androidveil/src/main/java/com/skydoves/androidveil/ResourceExtension.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 skydoves
+ * Designed and developed by 2018 skydoves (Jaewoong Eum)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/androidveil/src/main/java/com/skydoves/androidveil/VeilLayout.kt b/androidveil/src/main/java/com/skydoves/androidveil/VeilLayout.kt
index 762d981..1b89a58 100644
--- a/androidveil/src/main/java/com/skydoves/androidveil/VeilLayout.kt
+++ b/androidveil/src/main/java/com/skydoves/androidveil/VeilLayout.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 skydoves
+ * Designed and developed by 2018 skydoves (Jaewoong Eum)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -38,17 +38,17 @@ import com.facebook.shimmer.ShimmerFrameLayout
 
 /** create a [Shimmer] by [Shimmer.AlphaHighlightBuilder] using dsl. */
 @JvmSynthetic
-inline fun alphaShimmer(crossinline block: Shimmer.AlphaHighlightBuilder.() -> Unit): Shimmer =
+public inline fun alphaShimmer(crossinline block: Shimmer.AlphaHighlightBuilder.() -> Unit): Shimmer =
   Shimmer.AlphaHighlightBuilder().apply(block).build()
 
 /** create a [Shimmer] by [Shimmer.ColorHighlightBuilder] using dsl. */
 @JvmSynthetic
-inline fun colorShimmer(crossinline block: Shimmer.ColorHighlightBuilder.() -> Unit): Shimmer =
+public inline fun colorShimmer(crossinline block: Shimmer.ColorHighlightBuilder.() -> Unit): Shimmer =
   Shimmer.ColorHighlightBuilder().apply(block).build()
 
 /** VeilLayout creates skeletons about the complex child views with shimmering effect. */
 @Suppress("HasPlatformType", "MemberVisibilityCanBePrivate")
-class VeilLayout : FrameLayout {
+public class VeilLayout : FrameLayout {
 
   @ColorInt
   private var baseColor = Color.LTGRAY
@@ -66,27 +66,28 @@ class VeilLayout : FrameLayout {
   private var dropOff = 0.5f
 
   @Px
-  var radius = 8f.dp2px(this)
-  var drawable: Drawable? = null
+  public var radius: Float = 8f.dp2px(this)
+  public var drawable: Drawable? = null
 
   @LayoutRes
-  var layout = -1
+  public var layout: Int = -1
     set(value) {
       field = value
       invalidateLayout(value)
     }
 
-  var isVeiled = false
+  public var isVeiled: Boolean = false
     private set
 
-  val shimmerContainer = ShimmerFrameLayout(context)
-  val nonShimmer = Shimmer.AlphaHighlightBuilder().setBaseAlpha(1.0f).setDropoff(1.0f).build()
-  var shimmer = Shimmer.AlphaHighlightBuilder().build()
+  public val shimmerContainer: ShimmerFrameLayout = ShimmerFrameLayout(context)
+  public val nonShimmer: Shimmer =
+    Shimmer.AlphaHighlightBuilder().setBaseAlpha(1.0f).setDropoff(1.0f).build()
+  public var shimmer: Shimmer = Shimmer.AlphaHighlightBuilder().build()
     set(value) {
       field = value
       shimmerContainer.setShimmer(value)
     }
-  var shimmerEnable: Boolean = true
+  public var shimmerEnable: Boolean = true
     set(value) {
       field = value
       when (value) {
@@ -94,19 +95,20 @@ class VeilLayout : FrameLayout {
         false -> shimmerContainer.setShimmer(nonShimmer)
       }
     }
-  var defaultChildVisible = false
+  public var defaultChildVisible: Boolean = false
 
-  constructor(context: Context) : super(context) {
+  public constructor(context: Context) : super(context) {
     onCreate()
   }
 
-  constructor(context: Context, attrs: AttributeSet?) : super(context, attrs) {
+  public constructor(context: Context, attrs: AttributeSet?) : super(context, attrs) {
     getAttrs(attrs)
     onCreate()
   }
 
-  constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : super(
-    context, attrs,
+  public constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : super(
+    context,
+    attrs,
     defStyleAttr
   ) {
     getAttrs(attrs)
@@ -114,8 +116,16 @@ class VeilLayout : FrameLayout {
   }
 
   @TargetApi(Build.VERSION_CODES.LOLLIPOP)
-  constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int, defStyleRes: Int) : super(
-    context, attrs, defStyleAttr, defStyleRes
+  public constructor(
+    context: Context,
+    attrs: AttributeSet?,
+    defStyleAttr: Int,
+    defStyleRes: Int
+  ) : super(
+    context,
+    attrs,
+    defStyleAttr,
+    defStyleRes
   ) {
     getAttrs(attrs)
     onCreate()
@@ -124,31 +134,42 @@ class VeilLayout : FrameLayout {
   private fun getAttrs(attrs: AttributeSet?) {
     val a = context.obtainStyledAttributes(attrs, R.styleable.VeilLayout)
     try {
-      if (a.hasValue(R.styleable.VeilLayout_veilLayout_veiled))
+      if (a.hasValue(R.styleable.VeilLayout_veilLayout_veiled)) {
         isVeiled = a.getBoolean(R.styleable.VeilLayout_veilLayout_veiled, isVeiled)
-      if (a.hasValue(R.styleable.VeilLayout_veilLayout_layout))
+      }
+      if (a.hasValue(R.styleable.VeilLayout_veilLayout_layout)) {
         layout = a.getResourceId(R.styleable.VeilLayout_veilLayout_layout, -1)
-      if (a.hasValue(R.styleable.VeilLayout_veilLayout_drawable))
+      }
+      if (a.hasValue(R.styleable.VeilLayout_veilLayout_drawable)) {
         drawable = a.getDrawable(R.styleable.VeilLayout_veilLayout_drawable)
-      if (a.hasValue(R.styleable.VeilLayout_veilLayout_radius))
+      }
+      if (a.hasValue(R.styleable.VeilLayout_veilLayout_radius)) {
         radius = a.getDimension(R.styleable.VeilLayout_veilLayout_radius, radius)
-      if (a.hasValue(R.styleable.VeilLayout_veilLayout_shimmerEnable))
+      }
+      if (a.hasValue(R.styleable.VeilLayout_veilLayout_shimmerEnable)) {
         shimmerEnable = a.getBoolean(R.styleable.VeilLayout_veilLayout_shimmerEnable, shimmerEnable)
-      if (a.hasValue(R.styleable.VeilLayout_veilLayout_baseColor))
+      }
+      if (a.hasValue(R.styleable.VeilLayout_veilLayout_baseColor)) {
         baseColor = a.getColor(R.styleable.VeilLayout_veilLayout_baseColor, baseColor)
-      if (a.hasValue(R.styleable.VeilLayout_veilLayout_highlightColor))
+      }
+      if (a.hasValue(R.styleable.VeilLayout_veilLayout_highlightColor)) {
         highlightColor =
           a.getColor(R.styleable.VeilLayout_veilLayout_highlightColor, highlightColor)
-      if (a.hasValue(R.styleable.VeilLayout_veilLayout_baseAlpha))
+      }
+      if (a.hasValue(R.styleable.VeilLayout_veilLayout_baseAlpha)) {
         baseAlpha = a.getFloat(R.styleable.VeilLayout_veilLayout_baseAlpha, baseAlpha)
-      if (a.hasValue(R.styleable.VeilLayout_veilLayout_highlightAlpha))
+      }
+      if (a.hasValue(R.styleable.VeilLayout_veilLayout_highlightAlpha)) {
         highlightAlpha =
           a.getFloat(R.styleable.VeilLayout_veilLayout_highlightAlpha, highlightAlpha)
-      if (a.hasValue(R.styleable.VeilLayout_veilLayout_dropOff))
+      }
+      if (a.hasValue(R.styleable.VeilLayout_veilLayout_dropOff)) {
         dropOff = a.getFloat(R.styleable.VeilLayout_veilLayout_dropOff, dropOff)
-      if (a.hasValue(R.styleable.VeilLayout_veilLayout_defaultChildVisible))
+      }
+      if (a.hasValue(R.styleable.VeilLayout_veilLayout_defaultChildVisible)) {
         defaultChildVisible =
           a.getBoolean(R.styleable.VeilLayout_veilLayout_defaultChildVisible, defaultChildVisible)
+      }
     } finally {
       a.recycle()
     }
@@ -170,7 +191,7 @@ class VeilLayout : FrameLayout {
   }
 
   /** Remove previous views and inflate a new layout using an inflated view. */
-  fun setLayout(layout: View) {
+  public fun setLayout(layout: View) {
     removeAllViews()
     addView(layout)
     shimmerContainer.removeAllViews()
@@ -242,7 +263,7 @@ class VeilLayout : FrameLayout {
   }
 
   /** Make appear the mask. */
-  fun veil() {
+  public fun veil() {
     if (!this.isVeiled) {
       this.isVeiled = true
       startShimmer()
@@ -251,7 +272,7 @@ class VeilLayout : FrameLayout {
   }
 
   /** Make disappear the mask. */
-  fun unVeil() {
+  public fun unVeil() {
     if (this.isVeiled) {
       this.isVeiled = false
       stopShimmer()
@@ -260,7 +281,7 @@ class VeilLayout : FrameLayout {
   }
 
   /** Starts the shimmer animation. */
-  fun startShimmer() {
+  public fun startShimmer() {
     this.shimmerContainer.visible()
     if (this.shimmerEnable) {
       this.shimmerContainer.startShimmer()
@@ -271,7 +292,7 @@ class VeilLayout : FrameLayout {
   }
 
   /** Stops the shimmer animation. */
-  fun stopShimmer() {
+  public fun stopShimmer() {
     this.shimmerContainer.invisible()
     this.shimmerContainer.stopShimmer()
     if (!this.defaultChildVisible) {
diff --git a/androidveil/src/main/java/com/skydoves/androidveil/VeilParams.kt b/androidveil/src/main/java/com/skydoves/androidveil/VeilParams.kt
index 58b2da5..2c85865 100644
--- a/androidveil/src/main/java/com/skydoves/androidveil/VeilParams.kt
+++ b/androidveil/src/main/java/com/skydoves/androidveil/VeilParams.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 skydoves
+ * Designed and developed by 2018 skydoves (Jaewoong Eum)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/androidveil/src/main/java/com/skydoves/androidveil/VeilRecyclerFrameView.kt b/androidveil/src/main/java/com/skydoves/androidveil/VeilRecyclerFrameView.kt
index 10bd0ff..ae2c151 100644
--- a/androidveil/src/main/java/com/skydoves/androidveil/VeilRecyclerFrameView.kt
+++ b/androidveil/src/main/java/com/skydoves/androidveil/VeilRecyclerFrameView.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 skydoves
+ * Designed and developed by 2018 skydoves (Jaewoong Eum)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -35,7 +35,7 @@ import com.facebook.shimmer.Shimmer
 
 /** VeilRecyclerFrameView implements skeleton veiling for user [RecyclerView] with shimmering effect. */
 @Suppress("unused", "MemberVisibilityCanBePrivate")
-class VeilRecyclerFrameView : RelativeLayout {
+public class VeilRecyclerFrameView : RelativeLayout {
 
   private val userRecyclerView: RecyclerView = RecyclerView(context)
   private val veiledRecyclerView: RecyclerView = RecyclerView(context)
@@ -64,24 +64,25 @@ class VeilRecyclerFrameView : RelativeLayout {
   private var radius = 8f.dp2px(this)
   private var drawable: Drawable? = null
 
-  var shimmer: Shimmer? = null
-  var shimmerEnable: Boolean = true
-  var defaultChildVisible = false
+  public var shimmer: Shimmer? = null
+  public var shimmerEnable: Boolean = true
+  public var defaultChildVisible: Boolean = false
   private var isItemWrapContentWidth = false
   private var isItemWrapContentHeight = true
   private val threshold = 10
 
-  constructor(context: Context) : super(context) {
+  public constructor(context: Context) : super(context) {
     onCreate()
   }
 
-  constructor(context: Context, attrs: AttributeSet?) : super(context, attrs) {
+  public constructor(context: Context, attrs: AttributeSet?) : super(context, attrs) {
     getAttrs(attrs)
     onCreate()
   }
 
-  constructor(context: Context, attrs: AttributeSet?, defStyle: Int) : super(
-    context, attrs,
+  public constructor(context: Context, attrs: AttributeSet?, defStyle: Int) : super(
+    context,
+    attrs,
     defStyle
   ) {
     getAttrs(attrs)
@@ -91,47 +92,58 @@ class VeilRecyclerFrameView : RelativeLayout {
   private fun getAttrs(attrs: AttributeSet?) {
     val a = context.obtainStyledAttributes(attrs, R.styleable.VeilRecyclerFrameView)
     try {
-      if (a.hasValue(R.styleable.VeilRecyclerFrameView_veilFrame_veiled))
+      if (a.hasValue(R.styleable.VeilRecyclerFrameView_veilFrame_veiled)) {
         isVeiled =
           a.getBoolean(R.styleable.VeilRecyclerFrameView_veilFrame_veiled, isVeiled)
-      if (a.hasValue(R.styleable.VeilRecyclerFrameView_veilFrame_layout))
+      }
+      if (a.hasValue(R.styleable.VeilRecyclerFrameView_veilFrame_layout)) {
         layout = a.getResourceId(R.styleable.VeilRecyclerFrameView_veilFrame_layout, -1)
-      if (a.hasValue(R.styleable.VeilLayout_veilLayout_drawable))
+      }
+      if (a.hasValue(R.styleable.VeilLayout_veilLayout_drawable)) {
         drawable = a.getDrawable(R.styleable.VeilRecyclerFrameView_veilFrame_drawable)
-      if (a.hasValue(R.styleable.VeilRecyclerFrameView_veilFrame_radius))
+      }
+      if (a.hasValue(R.styleable.VeilRecyclerFrameView_veilFrame_radius)) {
         radius = a.getDimension(R.styleable.VeilRecyclerFrameView_veilFrame_radius, radius)
-      if (a.hasValue(R.styleable.VeilRecyclerFrameView_veilFrame_shimmerEnable))
+      }
+      if (a.hasValue(R.styleable.VeilRecyclerFrameView_veilFrame_shimmerEnable)) {
         shimmerEnable =
           a.getBoolean(
             R.styleable.VeilRecyclerFrameView_veilFrame_shimmerEnable,
             shimmerEnable
           )
-      if (a.hasValue(R.styleable.VeilRecyclerFrameView_veilFrame_baseColor))
+      }
+      if (a.hasValue(R.styleable.VeilRecyclerFrameView_veilFrame_baseColor)) {
         baseColor =
           a.getColor(R.styleable.VeilRecyclerFrameView_veilFrame_baseColor, baseColor)
-      if (a.hasValue(R.styleable.VeilRecyclerFrameView_veilFrame_highlightColor))
+      }
+      if (a.hasValue(R.styleable.VeilRecyclerFrameView_veilFrame_highlightColor)) {
         highlightColor =
           a.getColor(
             R.styleable.VeilRecyclerFrameView_veilFrame_highlightColor,
             highlightColor
           )
-      if (a.hasValue(R.styleable.VeilRecyclerFrameView_veilFrame_baseAlpha))
+      }
+      if (a.hasValue(R.styleable.VeilRecyclerFrameView_veilFrame_baseAlpha)) {
         baseAlpha =
           a.getFloat(R.styleable.VeilRecyclerFrameView_veilFrame_baseAlpha, baseAlpha)
-      if (a.hasValue(R.styleable.VeilRecyclerFrameView_veilFrame_highlightAlpha))
+      }
+      if (a.hasValue(R.styleable.VeilRecyclerFrameView_veilFrame_highlightAlpha)) {
         highlightAlpha =
           a.getFloat(
             R.styleable.VeilRecyclerFrameView_veilFrame_highlightAlpha,
             highlightAlpha
           )
-      if (a.hasValue(R.styleable.VeilRecyclerFrameView_veilFrame_dropOff))
+      }
+      if (a.hasValue(R.styleable.VeilRecyclerFrameView_veilFrame_dropOff)) {
         dropOff = a.getFloat(R.styleable.VeilRecyclerFrameView_veilFrame_dropOff, dropOff)
-      if (a.hasValue(R.styleable.VeilRecyclerFrameView_veilFrame_defaultChildVisible))
+      }
+      if (a.hasValue(R.styleable.VeilRecyclerFrameView_veilFrame_defaultChildVisible)) {
         defaultChildVisible =
           a.getBoolean(
             R.styleable.VeilRecyclerFrameView_veilFrame_defaultChildVisible,
             defaultChildVisible
           )
+      }
       if (a.hasValue(R.styleable.VeilRecyclerFrameView_veilFrame_isItemWrapContentWidth)) {
         isItemWrapContentWidth = a.getBoolean(
           R.styleable.VeilRecyclerFrameView_veilFrame_isItemWrapContentWidth,
@@ -165,19 +177,19 @@ class VeilRecyclerFrameView : RelativeLayout {
   }
 
   /** Sets mask layout. */
-  fun setVeilLayout(@LayoutRes layout: Int) {
+  public fun setVeilLayout(@LayoutRes layout: Int) {
     this.veiledAdapter =
       VeiledAdapter(
         userLayout = layout,
         isListItemWrapContentWidth = isItemWrapContentWidth,
-        isListItemWrapContentHeight = isItemWrapContentHeight,
+        isListItemWrapContentHeight = isItemWrapContentHeight
       )
     this.veiledRecyclerView.adapter = this.veiledAdapter
     requestLayout()
   }
 
   /** Sets mask layout and VeiledItemOnClickListener. */
-  fun setVeilLayout(
+  public fun setVeilLayout(
     @LayoutRes layout: Int,
     onItemClickListener: VeiledItemOnClickListener
   ) {
@@ -186,20 +198,20 @@ class VeilRecyclerFrameView : RelativeLayout {
         userLayout = layout,
         onItemClickListener = onItemClickListener,
         isListItemWrapContentWidth = isItemWrapContentWidth,
-        isListItemWrapContentHeight = isItemWrapContentHeight,
+        isListItemWrapContentHeight = isItemWrapContentHeight
       )
     this.veiledRecyclerView.adapter = this.veiledAdapter
   }
 
   /** Sets mask layout and adds masked items. */
-  fun setVeilLayout(@LayoutRes layout: Int, size: Int) {
+  public fun setVeilLayout(@LayoutRes layout: Int, size: Int) {
     this.setVeilLayout(layout)
     this.addVeiledItems(size)
     requestLayout()
   }
 
   /** Sets mask layout and VeiledItemOnClickListener and adds masked items. */
-  fun setVeilLayout(
+  public fun setVeilLayout(
     @LayoutRes layout: Int,
     onItemClickListener: VeiledItemOnClickListener,
     size: Int
@@ -209,7 +221,7 @@ class VeilRecyclerFrameView : RelativeLayout {
   }
 
   /** Adds masked items. */
-  fun addVeiledItems(size: Int) {
+  public fun addVeiledItems(size: Int) {
     val paramList = ArrayList<VeilParams>()
     for (i in 0 until size) {
       paramList.add(
@@ -231,19 +243,22 @@ class VeilRecyclerFrameView : RelativeLayout {
   }
 
   /** Sets userRecyclerView's adapter. */
-  fun setAdapter(adapter: RecyclerView.Adapter<*>?) {
+  public fun setAdapter(adapter: RecyclerView.Adapter<*>?) {
     this.userRecyclerView.adapter = adapter
     this.invalidate()
   }
 
   /** Sets userRecyclerView's adapter and RecyclerViews LayoutManager. */
-  fun setAdapter(adapter: RecyclerView.Adapter<*>?, layoutManager: RecyclerView.LayoutManager) {
+  public fun setAdapter(
+    adapter: RecyclerView.Adapter<*>?,
+    layoutManager: RecyclerView.LayoutManager
+  ) {
     this.setAdapter(adapter)
     this.setLayoutManager(layoutManager)
   }
 
   /** Sets RecyclerViews LayoutManager. */
-  fun setLayoutManager(layoutManager: RecyclerView.LayoutManager) {
+  public fun setLayoutManager(layoutManager: RecyclerView.LayoutManager) {
     this.userRecyclerView.layoutManager = layoutManager
     when (layoutManager) {
       is GridLayoutManager ->
@@ -264,7 +279,7 @@ class VeilRecyclerFrameView : RelativeLayout {
   }
 
   /** Make appear the mask. */
-  fun veil() {
+  public fun veil() {
     this.veiledAdapter?.let {
       if (!this.isVeiled) {
         this.isVeiled = true
@@ -274,7 +289,7 @@ class VeilRecyclerFrameView : RelativeLayout {
   }
 
   /** Make disappear the mask. */
-  fun unVeil() {
+  public fun unVeil() {
     if (this.isVeiled) {
       this.isVeiled = false
       visibleUserRecyclerView()
@@ -282,12 +297,12 @@ class VeilRecyclerFrameView : RelativeLayout {
   }
 
   /** Returns a veiled recyclerView. */
-  fun getVeiledRecyclerView(): RecyclerView {
+  public fun getVeiledRecyclerView(): RecyclerView {
     return this.veiledRecyclerView
   }
 
   /** Returns a user recyclerView. */
-  fun getRecyclerView(): RecyclerView {
+  public fun getRecyclerView(): RecyclerView {
     return this.userRecyclerView
   }
 
diff --git a/androidveil/src/main/java/com/skydoves/androidveil/VeiledAdapter.kt b/androidveil/src/main/java/com/skydoves/androidveil/VeiledAdapter.kt
index a68a273..4b91d23 100644
--- a/androidveil/src/main/java/com/skydoves/androidveil/VeiledAdapter.kt
+++ b/androidveil/src/main/java/com/skydoves/androidveil/VeiledAdapter.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 skydoves
+ * Designed and developed by 2018 skydoves (Jaewoong Eum)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -20,19 +20,19 @@ import android.view.LayoutInflater
 import android.view.ViewGroup
 import androidx.annotation.LayoutRes
 import androidx.recyclerview.widget.RecyclerView
-import com.skydoves.androidveil.databinding.ItemVeiledLayoutAndroidveilSkydovesBinding
+import com.skydoves.androidveil.databinding.VeilItemLayoutBinding
 
 internal class VeiledAdapter(
   @LayoutRes private val userLayout: Int,
   private val onItemClickListener: VeiledItemOnClickListener? = null,
   private val isListItemWrapContentWidth: Boolean = false,
-  private val isListItemWrapContentHeight: Boolean = true,
+  private val isListItemWrapContentHeight: Boolean = true
 ) : RecyclerView.Adapter<VeiledAdapter.VeiledViewHolder>() {
 
   private val veilParamList: MutableList<VeilParams> = mutableListOf()
 
   override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): VeiledViewHolder {
-    val binding = ItemVeiledLayoutAndroidveilSkydovesBinding.inflate(
+    val binding = VeilItemLayoutBinding.inflate(
       LayoutInflater.from(parent.context),
       parent,
       false
@@ -51,7 +51,7 @@ internal class VeiledAdapter(
     with(holder.binding.itemVeilLayoutMain) {
       layoutParams = ViewGroup.LayoutParams(
         getLayoutParams(isListItemWrapContentWidth),
-        getLayoutParams(isListItemWrapContentHeight),
+        getLayoutParams(isListItemWrapContentHeight)
       )
       if (layout == -1) {
         layout = userLayout
@@ -95,6 +95,5 @@ internal class VeiledAdapter(
 
   override fun getItemCount() = veilParamList.size
 
-  class VeiledViewHolder(val binding: ItemVeiledLayoutAndroidveilSkydovesBinding) :
-    RecyclerView.ViewHolder(binding.root)
+  class VeiledViewHolder(val binding: VeilItemLayoutBinding) : RecyclerView.ViewHolder(binding.root)
 }
diff --git a/androidveil/src/main/java/com/skydoves/androidveil/VeiledItemOnClickListener.kt b/androidveil/src/main/java/com/skydoves/androidveil/VeiledItemOnClickListener.kt
index 19009f7..f05457d 100644
--- a/androidveil/src/main/java/com/skydoves/androidveil/VeiledItemOnClickListener.kt
+++ b/androidveil/src/main/java/com/skydoves/androidveil/VeiledItemOnClickListener.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 skydoves
+ * Designed and developed by 2018 skydoves (Jaewoong Eum)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,8 +17,8 @@
 package com.skydoves.androidveil
 
 /** VeiledItemOnClickListener is a delegation of veil item click. */
-fun interface VeiledItemOnClickListener {
+public fun interface VeiledItemOnClickListener {
 
   /** will be invoked when the item on the [VeilRecyclerFrameView] clicked. */
-  fun onItemClicked(pos: Int)
+  public fun onItemClicked(pos: Int)
 }
diff --git a/androidveil/src/main/java/com/skydoves/androidveil/ViewExtension.kt b/androidveil/src/main/java/com/skydoves/androidveil/ViewExtension.kt
index 8ef9841..99c0932 100644
--- a/androidveil/src/main/java/com/skydoves/androidveil/ViewExtension.kt
+++ b/androidveil/src/main/java/com/skydoves/androidveil/ViewExtension.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 skydoves
+ * Designed and developed by 2018 skydoves (Jaewoong Eum)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/androidveil/src/main/res/layout/item_veiled_layout_androidveil_skydoves.xml b/androidveil/src/main/res/layout/item_veiled_layout_androidveil_skydoves.xml
deleted file mode 100644
index 843028a..0000000
--- a/androidveil/src/main/res/layout/item_veiled_layout_androidveil_skydoves.xml
+++ /dev/null
@@ -1,5 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<com.skydoves.androidveil.VeilLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    android:id="@+id/item_veilLayout_main"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent" />
\ No newline at end of file
diff --git a/androidveil/src/main/res/layout/veil_item_layout.xml b/androidveil/src/main/res/layout/veil_item_layout.xml
new file mode 100644
index 0000000..b86d9df
--- /dev/null
+++ b/androidveil/src/main/res/layout/veil_item_layout.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    Designed and developed by 2018 skydoves (Jaewoong Eum)
+
+    Licensed under the Stream License;
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
+<com.skydoves.androidveil.VeilLayout xmlns:android="http://schemas.android.com/apk/res/android"
+  android:id="@+id/item_veilLayout_main"
+  android:layout_width="match_parent"
+  android:layout_height="match_parent" />
\ No newline at end of file
diff --git a/androidveil/src/main/res/values/attrs_veil.xml b/androidveil/src/main/res/values/attrs_veil.xml
index 8bdbead..2843207 100644
--- a/androidveil/src/main/res/values/attrs_veil.xml
+++ b/androidveil/src/main/res/values/attrs_veil.xml
@@ -1,4 +1,19 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+    Designed and developed by 2018 skydoves (Jaewoong Eum)
+
+    Licensed under the Stream License;
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
 <resources>
   <declare-styleable name="VeilLayout">
     <attr name="veilLayout_veiled" format="boolean" />
diff --git a/app/build.gradle b/app/build.gradle
index 907a0c4..7a0adeb 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -27,4 +27,3 @@ dependencies {
     implementation project(":androidveil")
 }
 
-apply from: "$rootDir/spotless.gradle"
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9fd3a7d..50ae0a5 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,19 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+    Designed and developed by 2018 skydoves (Jaewoong Eum)
+
+    Licensed under the Stream License;
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:tools="http://schemas.android.com/tools"
   package="com.skydoves.androidveildemo">
diff --git a/app/src/main/java/com/skydoves/androidveildemo/DetailActivity.kt b/app/src/main/java/com/skydoves/androidveildemo/DetailActivity.kt
index c2f0fb9..fbd0c26 100644
--- a/app/src/main/java/com/skydoves/androidveildemo/DetailActivity.kt
+++ b/app/src/main/java/com/skydoves/androidveildemo/DetailActivity.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 skydoves
+ * Designed and developed by 2018 skydoves (Jaewoong Eum)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/app/src/main/java/com/skydoves/androidveildemo/Extension.kt b/app/src/main/java/com/skydoves/androidveildemo/Extension.kt
index 8c051f1..107eb4d 100644
--- a/app/src/main/java/com/skydoves/androidveildemo/Extension.kt
+++ b/app/src/main/java/com/skydoves/androidveildemo/Extension.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 skydoves
+ * Designed and developed by 2018 skydoves (Jaewoong Eum)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/app/src/main/java/com/skydoves/androidveildemo/MainActivity.kt b/app/src/main/java/com/skydoves/androidveildemo/MainActivity.kt
index 5fa7139..b282ea9 100644
--- a/app/src/main/java/com/skydoves/androidveildemo/MainActivity.kt
+++ b/app/src/main/java/com/skydoves/androidveildemo/MainActivity.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 skydoves
+ * Designed and developed by 2018 skydoves (Jaewoong Eum)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/app/src/main/java/com/skydoves/androidveildemo/SecondActivity.kt b/app/src/main/java/com/skydoves/androidveildemo/SecondActivity.kt
index 87a5474..8f0dcc7 100644
--- a/app/src/main/java/com/skydoves/androidveildemo/SecondActivity.kt
+++ b/app/src/main/java/com/skydoves/androidveildemo/SecondActivity.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 skydoves
+ * Designed and developed by 2018 skydoves (Jaewoong Eum)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/app/src/main/java/com/skydoves/androidveildemo/ShimmerUtils.kt b/app/src/main/java/com/skydoves/androidveildemo/ShimmerUtils.kt
index c48d663..2ab3269 100644
--- a/app/src/main/java/com/skydoves/androidveildemo/ShimmerUtils.kt
+++ b/app/src/main/java/com/skydoves/androidveildemo/ShimmerUtils.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 skydoves
+ * Designed and developed by 2018 skydoves (Jaewoong Eum)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/app/src/main/java/com/skydoves/androidveildemo/profile/ListItemUtils.kt b/app/src/main/java/com/skydoves/androidveildemo/profile/ListItemUtils.kt
index add828d..2570fb8 100644
--- a/app/src/main/java/com/skydoves/androidveildemo/profile/ListItemUtils.kt
+++ b/app/src/main/java/com/skydoves/androidveildemo/profile/ListItemUtils.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 skydoves
+ * Designed and developed by 2018 skydoves (Jaewoong Eum)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -30,49 +30,57 @@ object ListItemUtils {
     val list = ArrayList<Profile>()
     list.add(
       Profile(
-        ContextCompat.getDrawable(context, R.drawable.person0), "The Little Prince",
+        ContextCompat.getDrawable(context, R.drawable.person0),
+        "The Little Prince",
         "And now here is my secret, a very simple secret: It is only with the heart that one can see rightly; what is essential is invisible to the eye."
       )
     )
     list.add(
       Profile(
-        ContextCompat.getDrawable(context, R.drawable.person1), "Mia Vance",
+        ContextCompat.getDrawable(context, R.drawable.person1),
+        "Mia Vance",
         "All grown-ups were once children... but only few of them remember it."
       )
     )
     list.add(
       Profile(
-        ContextCompat.getDrawable(context, R.drawable.person2), "Ryker Beil",
+        ContextCompat.getDrawable(context, R.drawable.person2),
+        "Ryker Beil",
         "What makes the desert beautiful,' said the little prince, 'is that somewhere it hides a well..."
       )
     )
     list.add(
       Profile(
-        ContextCompat.getDrawable(context, R.drawable.person3), "Kayden Bautista",
+        ContextCompat.getDrawable(context, R.drawable.person3),
+        "Kayden Bautista",
         "It is the time you have wasted for your rose that makes your rose so important."
       )
     )
     list.add(
       Profile(
-        ContextCompat.getDrawable(context, R.drawable.person4), "Skylar Odom",
+        ContextCompat.getDrawable(context, R.drawable.person4),
+        "Skylar Odom",
         "The most beautiful things in the world cannot be seen or touched, they are felt with the heart."
       )
     )
     list.add(
       Profile(
-        ContextCompat.getDrawable(context, R.drawable.person5), "Autumn Villegas",
+        ContextCompat.getDrawable(context, R.drawable.person5),
+        "Autumn Villegas",
         "It is such a mysterious place, the land of tears."
       )
     )
     list.add(
       Profile(
-        ContextCompat.getDrawable(context, R.drawable.person6), "Wyatt Sherman",
+        ContextCompat.getDrawable(context, R.drawable.person6),
+        "Wyatt Sherman",
         "Well, I must endure the presence of a few caterpillars if I wish to become acquainted with the butterflies."
       )
     )
     list.add(
       Profile(
-        ContextCompat.getDrawable(context, R.drawable.person7), "Rachel Alvarado",
+        ContextCompat.getDrawable(context, R.drawable.person7),
+        "Rachel Alvarado",
         "You see, one loves the sunset when one is so sad."
       )
     )
diff --git a/app/src/main/java/com/skydoves/androidveildemo/profile/Profile.kt b/app/src/main/java/com/skydoves/androidveildemo/profile/Profile.kt
index d141fb2..f5cc820 100644
--- a/app/src/main/java/com/skydoves/androidveildemo/profile/Profile.kt
+++ b/app/src/main/java/com/skydoves/androidveildemo/profile/Profile.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 skydoves
+ * Designed and developed by 2018 skydoves (Jaewoong Eum)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/app/src/main/java/com/skydoves/androidveildemo/profile/ProfileAdapter.kt b/app/src/main/java/com/skydoves/androidveildemo/profile/ProfileAdapter.kt
index 961f6ed..b1c113a 100644
--- a/app/src/main/java/com/skydoves/androidveildemo/profile/ProfileAdapter.kt
+++ b/app/src/main/java/com/skydoves/androidveildemo/profile/ProfileAdapter.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 skydoves
+ * Designed and developed by 2018 skydoves (Jaewoong Eum)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 1f6bb29..96f8c70 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    Designed and developed by 2018 skydoves (Jaewoong Eum)
+
+    Licensed under the Stream License;
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index a339898..3292e6f 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,4 +1,19 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+    Designed and developed by 2018 skydoves (Jaewoong Eum)
+
+    Licensed under the Stream License;
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
diff --git a/app/src/main/res/layout/activity_detail.xml b/app/src/main/res/layout/activity_detail.xml
index 8dbc39c..7769a2a 100644
--- a/app/src/main/res/layout/activity_detail.xml
+++ b/app/src/main/res/layout/activity_detail.xml
@@ -1,4 +1,19 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+    Designed and developed by 2018 skydoves (Jaewoong Eum)
+
+    Licensed under the Stream License;
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
 <androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index ecf5c87..69fb50a 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,4 +1,19 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+    Designed and developed by 2018 skydoves (Jaewoong Eum)
+
+    Licensed under the Stream License;
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   android:id="@+id/linearLayout"
diff --git a/app/src/main/res/layout/activity_second.xml b/app/src/main/res/layout/activity_second.xml
index 9d69aaf..dbd4c6d 100644
--- a/app/src/main/res/layout/activity_second.xml
+++ b/app/src/main/res/layout/activity_second.xml
@@ -1,4 +1,19 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+    Designed and developed by 2018 skydoves (Jaewoong Eum)
+
+    Licensed under the Stream License;
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   android:id="@+id/linearLayout"
diff --git a/app/src/main/res/layout/item_preview.xml b/app/src/main/res/layout/item_preview.xml
index c6d9f41..99d6308 100644
--- a/app/src/main/res/layout/item_preview.xml
+++ b/app/src/main/res/layout/item_preview.xml
@@ -1,4 +1,19 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+    Designed and developed by 2018 skydoves (Jaewoong Eum)
+
+    Licensed under the Stream License;
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/item_profile.xml b/app/src/main/res/layout/item_profile.xml
index ce74333..6f6fd42 100644
--- a/app/src/main/res/layout/item_profile.xml
+++ b/app/src/main/res/layout/item_profile.xml
@@ -1,4 +1,19 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+    Designed and developed by 2018 skydoves (Jaewoong Eum)
+
+    Licensed under the Stream License;
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
index eca70cf..70c3db5 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -1,4 +1,19 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+    Designed and developed by 2018 skydoves (Jaewoong Eum)
+
+    Licensed under the Stream License;
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
index eca70cf..70c3db5 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -1,4 +1,19 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+    Designed and developed by 2018 skydoves (Jaewoong Eum)
+
+    Licensed under the Stream License;
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/values-v21/styles.xml b/app/src/main/res/values-v21/styles.xml
index 734c081..2a5e200 100644
--- a/app/src/main/res/values-v21/styles.xml
+++ b/app/src/main/res/values-v21/styles.xml
@@ -1,3 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    Designed and developed by 2018 skydoves (Jaewoong Eum)
+
+    Licensed under the Stream License;
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
 <resources>
   <!-- Base application theme. -->
   <style name="DetailTheme" parent="AppTheme">
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index 8109b2d..0337d92 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -1,4 +1,19 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+    Designed and developed by 2018 skydoves (Jaewoong Eum)
+
+    Licensed under the Stream License;
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
 <resources>
   <color name="colorPrimary">#3d95c9</color>
   <color name="colorPrimaryDark">#2485be</color>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 82fd4e7..b4879e5 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    Designed and developed by 2018 skydoves (Jaewoong Eum)
+
+    Licensed under the Stream License;
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
 <resources>
   <string name="app_name">AndroidVeilDemo</string>
   <string name="msg_loading">Loading</string>
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
index c119370..881f533 100644
--- a/app/src/main/res/values/styles.xml
+++ b/app/src/main/res/values/styles.xml
@@ -1,3 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    Designed and developed by 2018 skydoves (Jaewoong Eum)
+
+    Licensed under the Stream License;
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
 <resources>
 
   <!-- Base application theme. -->
diff --git a/build.gradle b/build.gradle
index ecb456e..210a257 100644
--- a/build.gradle
+++ b/build.gradle
@@ -14,6 +14,10 @@ buildscript {
   }
 }
 
+subprojects {
+  apply from: "$rootDir/spotless/spotless.gradle"
+}
+
 allprojects {
   repositories {
     google()
diff --git a/dependencies.gradle b/dependencies.gradle
index ac9a38b..684512b 100644
--- a/dependencies.gradle
+++ b/dependencies.gradle
@@ -4,17 +4,17 @@ ext.versions = [
     versionCode      : 13,
     versionName      : '1.1.2',
 
-    gradleBuildTool  : '7.1.3',
-    spotlessGradle   : '6.3.0',
-    dokkaGradle      : '1.4.32',
-    binaryValidator  : '0.7.1',
+    gradleBuildTool  : '7.2.2',
+    spotlessGradle   : '6.7.0',
+    dokkaGradle      : '1.7.10',
+    binaryValidator  : '0.11.0',
     mavenPublish     : '0.15.1',
 
-    kotlin           : '1.6.0',
-    androidxAppcompat: '1.4.1',
+    kotlin           : '1.7.10',
+    androidxAppcompat: '1.5.0',
     recyclerView     : '1.2.1',
     shimmer          : '0.5.0',
 
     // for demo
-    googleMaterial   : '1.6.0'
+    googleMaterial   : '1.6.1'
 ]
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 92f06b5..8fad3f5 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.4.2-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.5.1-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/spotless.gradle b/spotless.gradle
deleted file mode 100644
index 533fbc9..0000000
--- a/spotless.gradle
+++ /dev/null
@@ -1,11 +0,0 @@
-apply plugin: "com.diffplug.spotless"
-apply from: "$rootDir/dependencies.gradle"
-spotless {
-    kotlin {
-        target "**/*.kt"
-        ktlint().userData(['indent_size': '2', 'continuation_indent_size': '2'])
-        licenseHeaderFile "$rootDir/spotless.license.kt"
-        trimTrailingWhitespace()
-        endWithNewline()
-    }
-}
\ No newline at end of file
diff --git a/spotless/spotless.gradle b/spotless/spotless.gradle
new file mode 100644
index 0000000..70b4d17
--- /dev/null
+++ b/spotless/spotless.gradle
@@ -0,0 +1,18 @@
+apply plugin: "com.diffplug.spotless"
+apply from: "$rootDir/dependencies.gradle"
+
+spotless {
+  kotlin {
+    target "**/*.kt"
+    targetExclude "**/build/**/*.kt"
+    ktlint().setUseExperimental(true).editorConfigOverride(['indent_size': '2', 'continuation_indent_size': '2'])
+    licenseHeaderFile "$rootDir/spotless/spotless.license.kt"
+    trimTrailingWhitespace()
+    endWithNewline()
+  }
+  format "xml", {
+    target "**/*.xml"
+    targetExclude "**/build/**/*.xml", "**/detekt-baseline.xml"
+    licenseHeaderFile "$rootDir/spotless/spotless.license.xml", "(<[^!?])"
+  }
+}
\ No newline at end of file
diff --git a/spotless.license.kt b/spotless/spotless.license.kt
similarity index 90%
rename from spotless.license.kt
rename to spotless/spotless.license.kt
index 5c2dfed..2775484 100644
--- a/spotless.license.kt
+++ b/spotless/spotless.license.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 skydoves
+ * Designed and developed by 2018 skydoves (Jaewoong Eum)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/spotless/spotless.license.xml b/spotless/spotless.license.xml
new file mode 100644
index 0000000..3565e83
--- /dev/null
+++ b/spotless/spotless.license.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    Designed and developed by 2018 skydoves (Jaewoong Eum)
+
+    Licensed under the Stream License;
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->