diff --git a/app/src/main/java/com/xw/repo/bouncescrollviewsample/HouseBaratheonActivity.kt b/app/src/main/java/com/xw/repo/bouncescrollviewsample/HouseBaratheonActivity.kt
index 5a260cf..fbf0602 100644
--- a/app/src/main/java/com/xw/repo/bouncescrollviewsample/HouseBaratheonActivity.kt
+++ b/app/src/main/java/com/xw/repo/bouncescrollviewsample/HouseBaratheonActivity.kt
@@ -23,7 +23,7 @@ class HouseBaratheonActivity : AppCompatActivity() {
             supportActionBar!!.setDisplayHomeAsUpEnabled(true)
         }
 
-        mInterpolatorNameTV.setOnClickListener {
+        interpolatorNameBtn.setOnClickListener {
             PickerFragment().show(supportFragmentManager, PickerFragment::class.java.simpleName)
         }
     }
@@ -37,7 +37,7 @@ class HouseBaratheonActivity : AppCompatActivity() {
     }
 
     fun onInterpolatorSelected(ease: Ease) {
-        mInterpolatorNameTV.text = String.format("Interpolator of bounce movement: %s", ease.name)
+        interpolatorNameBtn.text = ease.name
         mBounceScrollView.setBounceInterpolator { input -> EasingProvider.get(ease, input) }
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/xw/repo/bouncescrollviewsample/HouseLannisterActivity.kt b/app/src/main/java/com/xw/repo/bouncescrollviewsample/HouseLannisterActivity.kt
index 93b7af0..661ab5d 100644
--- a/app/src/main/java/com/xw/repo/bouncescrollviewsample/HouseLannisterActivity.kt
+++ b/app/src/main/java/com/xw/repo/bouncescrollviewsample/HouseLannisterActivity.kt
@@ -4,7 +4,7 @@ import android.os.Bundle
 import android.support.v7.app.AppCompatActivity
 import android.view.MenuItem
 import com.xw.repo.BubbleSeekBar
-import kotlinx.android.synthetic.main.activity_house_stark.*
+import kotlinx.android.synthetic.main.activity_house_lannister.*
 import kotlinx.android.synthetic.main.layout_toolbar.*
 
 /**
diff --git a/app/src/main/java/com/xw/repo/bouncescrollviewsample/MainActivity.kt b/app/src/main/java/com/xw/repo/bouncescrollviewsample/MainActivity.kt
index 56d3df6..e6b52e5 100644
--- a/app/src/main/java/com/xw/repo/bouncescrollviewsample/MainActivity.kt
+++ b/app/src/main/java/com/xw/repo/bouncescrollviewsample/MainActivity.kt
@@ -1,9 +1,11 @@
 package com.xw.repo.bouncescrollviewsample
 
 import android.content.Intent
+import android.content.res.Resources
 import android.os.Bundle
 import android.support.v7.app.AppCompatActivity
 import android.view.View
+import android.view.ViewGroup
 import android.widget.FrameLayout
 import kotlinx.android.synthetic.main.activity_main.*
 
@@ -15,22 +17,22 @@ class MainActivity : AppCompatActivity() {
 
         setContentView(R.layout.activity_main)
 
-        val lp = mToolbar.layoutParams as FrameLayout.LayoutParams
-        lp.topMargin = Util.getStatusBarHeight()
-        mToolbar.layoutParams = lp
+        val statusBarHeight = Util.getStatusBarHeight()
+        mToolbar.setPadding(0, statusBarHeight, 0, 0)
+        val lp = mToolbar.layoutParams as ViewGroup.MarginLayoutParams
+        lp.height = statusBarHeight + (Resources.getSystem().displayMetrics.density * 56).toInt()
     }
 
     fun onClick(v: View) {
         val intent = Intent()
-        when {
-            v.id == R.id.mHouseStarkTV ->
+        when (v.id) {
+            R.id.mHouseStarkTV ->
                 intent.setClass(this, HouseStarkActivity::class.java)
-            v.id == R.id.mHouseTargaryenTV ->
+            R.id.mHouseTargaryenTV ->
                 intent.setClass(this, HouseTargaryenActivity::class.java)
-            v.id == R.id.mHouseLannisterTV ->
+            R.id.mHouseLannisterTV ->
                 intent.setClass(this, HouseLannisterActivity::class.java)
-            else ->
-                intent.setClass(this, HouseBaratheonActivity::class.java)
+            else -> intent.setClass(this, HouseBaratheonActivity::class.java)
         }
         startActivity(intent)
     }
diff --git a/app/src/main/res/layout/activity_house_baratheon.xml b/app/src/main/res/layout/activity_house_baratheon.xml
index 9b9c782..c73b479 100644
--- a/app/src/main/res/layout/activity_house_baratheon.xml
+++ b/app/src/main/res/layout/activity_house_baratheon.xml
@@ -35,8 +35,8 @@
                 <TextView
                     android:id="@+id/name_tv"
                     style="@style/TextStyleWithFont"
-                    android:layout_marginLeft="16dp"
                     android:layout_marginStart="16dp"
+                    android:layout_marginLeft="16dp"
                     android:text="HOUSE BARATHEON"
                     app:layout_constraintStart_toEndOf="@+id/sigil_iv"
                     app:layout_constraintTop_toTopOf="@+id/sigil_iv"/>
@@ -59,22 +59,34 @@
                     android:text="@string/introduction_of_house_baratheon"
                     android:textColor="@color/colorText"
                     android:textSize="16sp"
-                    app:layout_constraintBottom_toTopOf="@+id/mInterpolatorNameTV"
+                    app:layout_constraintBottom_toTopOf="@+id/hint_tv"
                     app:layout_constraintEnd_toEndOf="parent"
                     app:layout_constraintStart_toStartOf="parent"
                     app:layout_constraintTop_toBottomOf="@+id/sigil_iv"/>
 
                 <TextView
-                    android:id="@+id/mInterpolatorNameTV"
-                    android:layout_width="match_parent"
+                    android:id="@+id/hint_tv"
+                    android:layout_width="wrap_content"
                     android:layout_height="wrap_content"
-                    android:layout_marginBottom="24dp"
-                    android:padding="16dp"
-                    android:text="Interpolator of bounce movement: QUAD_IN"
+                    android:layout_marginBottom="8dp"
+                    android:text="Choose the interpolator of bounce movement:"
                     android:textColor="@color/colorAccent"
+                    app:layout_constraintBottom_toTopOf="@+id/interpolatorNameBtn"
+                    app:layout_constraintStart_toStartOf="@+id/interpolatorNameBtn"/>
+
+                <android.support.design.button.MaterialButton
+                    android:id="@+id/interpolatorNameBtn"
+                    style="@style/Widget.MaterialComponents.Button.OutlinedButton"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginStart="16dp"
+                    android:layout_marginBottom="32dp"
+                    android:text="QUAD_IN"
+                    app:cornerRadius="8dp"
                     app:layout_constraintBottom_toBottomOf="parent"
-                    app:layout_constraintEnd_toEndOf="parent"
-                    app:layout_constraintStart_toStartOf="parent"/>
+                    app:layout_constraintStart_toStartOf="parent"
+                    app:layout_constraintTop_toTopOf="@+id/hint_tv"
+                    app:strokeColor="@color/colorAccent"/>
             </android.support.constraint.ConstraintLayout>
         </com.xw.repo.widget.BounceScrollView>
     </FrameLayout>
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 73c45cb..d8a5486 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -54,9 +54,9 @@
             <TextView
                 android:id="@+id/mHouseStarkTV"
                 style="@style/TextStyleWithFont"
-                android:layout_marginLeft="32dp"
+                android:layout_marginStart="32dp"
                 android:layout_marginTop="24dp"
-                android:drawableLeft="@drawable/sigil_of_house_stark"
+                android:drawableStart="@drawable/sigil_of_house_stark"
                 android:drawablePadding="16dp"
                 android:gravity="center"
                 android:onClick="onClick"
@@ -68,7 +68,7 @@
                 android:id="@+id/mHouseTargaryenTV"
                 style="@style/TextStyleWithFont"
                 android:layout_marginTop="16dp"
-                android:drawableLeft="@drawable/sigil_of_house_targaryen"
+                android:drawableStart="@drawable/sigil_of_house_targaryen"
                 android:drawablePadding="16dp"
                 android:gravity="center"
                 android:onClick="onClick"
@@ -80,7 +80,7 @@
                 android:id="@+id/mHouseLannisterTV"
                 style="@style/TextStyleWithFont"
                 android:layout_marginTop="16dp"
-                android:drawableLeft="@drawable/sigil_of_house_lannister"
+                android:drawableStart="@drawable/sigil_of_house_lannister"
                 android:drawablePadding="16dp"
                 android:gravity="center"
                 android:onClick="onClick"
@@ -92,7 +92,7 @@
                 android:id="@+id/mHouseBaratheonTV"
                 style="@style/TextStyleWithFont"
                 android:layout_marginTop="16dp"
-                android:drawableLeft="@drawable/sigil_of_house_baratheon"
+                android:drawableStart="@drawable/sigil_of_house_baratheon"
                 android:drawablePadding="16dp"
                 android:gravity="center"
                 android:onClick="onClick"
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
index 8af0fc4..84757dc 100644
--- a/app/src/main/res/values/styles.xml
+++ b/app/src/main/res/values/styles.xml
@@ -1,7 +1,7 @@
 <resources>
 
     <!-- Base application theme. -->
-    <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
+    <style name="AppTheme" parent="Theme.MaterialComponents.Light.NoActionBar">
         <!-- Customize your theme here. -->
         <item name="colorPrimary">@color/colorPrimary</item>
         <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
diff --git a/build.gradle b/build.gradle
index a3176b9..dc25159 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,13 +1,13 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    ext.kotlin_version = '1.2.71'
+    ext.kotlin_version = '1.3.60'
     repositories {
         google()
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.2.1'
+        classpath 'com.android.tools.build:gradle:3.5.2'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
 
         // NOTE: Do not place your application dependencies here; they belong
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 83a2511..8936960 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Sun Oct 28 09:09:51 CST 2018
+#Sun Nov 24 14:41:06 CST 2019
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip