diff --git a/app/build.gradle b/app/build.gradle
index eddfa9f..6137d03 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,13 +1,12 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 23
-    buildToolsVersion "23.0.1"
+    compileSdkVersion 28
 
     defaultConfig {
         applicationId "com.viksaa.autofit.et"
-        minSdkVersion 14
-        targetSdkVersion 23
+        minSdkVersion 21
+        targetSdkVersion 28
         versionCode 1
         versionName "1.0"
     }
@@ -20,13 +19,9 @@ android {
 }
 
 dependencies {
-    compile fileTree(dir: 'libs', include: ['*.jar'])
-    testCompile 'junit:junit:4.12'
-    compile 'com.android.support:appcompat-v7:23.1.0'
-    compile 'com.android.support:design:23.1.0'
-
-    compile project(":lib")
-
-    /* ButterKnife */
-    compile 'com.jakewharton:butterknife:7.0.1'
+    implementation project(":lib")
+    testImplementation 'junit:junit:4.12'
+    implementation "androidx.appcompat:appcompat:1.1.0-rc01"
+    implementation "androidx.coordinatorlayout:coordinatorlayout:1.1.0-beta01"
+    implementation "com.google.android.material:material:1.1.0-alpha09"
 }
diff --git a/app/src/main/java/com/viksaa/autofit/et/MainActivity.java b/app/src/main/java/com/viksaa/autofit/et/MainActivity.java
index b7c2854..f23594c 100644
--- a/app/src/main/java/com/viksaa/autofit/et/MainActivity.java
+++ b/app/src/main/java/com/viksaa/autofit/et/MainActivity.java
@@ -1,36 +1,51 @@
 package com.viksaa.autofit.et;
 
 import android.os.Bundle;
-import android.support.design.widget.CoordinatorLayout;
-import android.support.v7.app.AppCompatActivity;
-import android.support.v7.widget.Toolbar;
 import android.view.Menu;
 import android.view.MenuItem;
+import android.widget.SeekBar;
+
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.appcompat.widget.Toolbar;
+import androidx.coordinatorlayout.widget.CoordinatorLayout;
 
 import com.autofit.et.lib.AutoFitEditText;
 import com.autofit.et.lib.AutoFitEditTextUtil;
 
-import butterknife.Bind;
-import butterknife.ButterKnife;
-
 public class MainActivity extends AppCompatActivity {
 
-    @Bind(R.id.toolbar)
-    Toolbar mToolbar;
-    @Bind(R.id.rET)
-    AutoFitEditText mAutoFitEditText;
-    @Bind(R.id.root)
-    CoordinatorLayout mRootView;
+    private Toolbar mToolbar;
+    private AutoFitEditText mAutoFitEditText;
+    private CoordinatorLayout mRootView;
+    private SeekBar mLetterSpacingSeekBar;
+    private SeekBar mLineSpacingSeekBar;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
-        ButterKnife.bind(this);
         setSupportActionBar(mToolbar);
+        mToolbar = findViewById(R.id.toolbar);
+        mAutoFitEditText = findViewById(R.id.rET);
+        mRootView = findViewById(R.id.root);
+        mLetterSpacingSeekBar = findViewById(R.id.letter_spacing_seek_bar);
+        mLineSpacingSeekBar = findViewById(R.id.line_spacing_seek_bar);
 
         initAutoFitEditText();
 
+        mLineSpacingSeekBar.setOnSeekBarChangeListener(new SimpleOnSeekBarChangeListener() {
+            @Override
+            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
+                mAutoFitEditText.setLineSpacing(progress, 1f);
+            }
+        });
+
+        mLetterSpacingSeekBar.setOnSeekBarChangeListener(new SimpleOnSeekBarChangeListener() {
+            @Override
+            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
+                mAutoFitEditText.setLetterSpacing(progress/100f);
+            }
+        });
     }
 
 
@@ -41,11 +56,11 @@ public void initAutoFitEditText() {
         mAutoFitEditText.setFocusable(true);
         mAutoFitEditText.setEnableSizeCache(false);
         //might cause crash on some devices
-        mAutoFitEditText.setMovementMethod(null);
+//        mAutoFitEditText.setMovementMethod(null);
         // can be added after layout inflation;
         mAutoFitEditText.setMaxHeight(330);
         //don't forget to add min text size programmatically
-        mAutoFitEditText.setMinTextSize(60f);
+        mAutoFitEditText.setMinTextSize(1f);
 
         AutoFitEditTextUtil.setNormalization(this, mRootView, mAutoFitEditText);
     }
@@ -64,4 +79,16 @@ public boolean onOptionsItemSelected(MenuItem item) {
         }
         return super.onOptionsItemSelected(item);
     }
+
+    private static abstract class SimpleOnSeekBarChangeListener implements SeekBar.OnSeekBarChangeListener {
+
+        @Override
+        public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { }
+
+        @Override
+        public void onStartTrackingTouch(SeekBar seekBar) { }
+
+        @Override
+        public void onStopTrackingTouch(SeekBar seekBar) { }
+    }
 }
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 8b7b51d..8d9f3c6 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<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"
     android:id="@+id/root"
@@ -8,21 +9,20 @@
     android:fitsSystemWindows="true"
     tools:context=".MainActivity">
 
-    <android.support.design.widget.AppBarLayout
+    <com.google.android.material.appbar.AppBarLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:theme="@style/AppTheme.AppBarOverlay">
 
-        <android.support.v7.widget.Toolbar
+        <androidx.appcompat.widget.Toolbar
             android:id="@+id/toolbar"
             android:layout_width="match_parent"
             android:layout_height="?attr/actionBarSize"
-            android:background="?attr/colorPrimary"
-            app:popupTheme="@style/AppTheme.PopupOverlay" />
+            android:background="?attr/colorPrimary" />
 
-    </android.support.design.widget.AppBarLayout>
+    </com.google.android.material.appbar.AppBarLayout>
 
     <include layout="@layout/content_main" />
 
 
-</android.support.design.widget.CoordinatorLayout>
+</androidx.coordinatorlayout.widget.CoordinatorLayout>
diff --git a/app/src/main/res/layout/content_main.xml b/app/src/main/res/layout/content_main.xml
index afb2b1a..d4dc050 100644
--- a/app/src/main/res/layout/content_main.xml
+++ b/app/src/main/res/layout/content_main.xml
@@ -11,15 +11,13 @@
     <FrameLayout
         android:id="@+id/container"
         android:layout_width="match_parent"
-        android:layout_height="333dp"
-        android:layout_centerInParent="true"
-        android:background="@color/primary" >
+        android:layout_height="match_parent"
+        android:layout_above="@id/seek_bars_container">
 
         <com.autofit.et.lib.AutoFitEditText
             android:id="@+id/rET"
             android:layout_height="match_parent"
             android:layout_width="match_parent"
-            android:background="@color/primary"
             android:focusable="true"
             android:focusableInTouchMode="true"
             android:gravity="center_vertical|center_horizontal"
@@ -27,8 +25,33 @@
             android:isScrollContainer="false"
             android:inputType="textMultiLine|textNoSuggestions"
             android:maxLength="240"
-            android:textColor="@android:color/white"
-            android:textColorHint="@android:color/white"
             android:textSize="90sp" />
     </FrameLayout>
+
+    <LinearLayout
+        android:id="@+id/seek_bars_container"
+        android:orientation="vertical"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_alignParentBottom="true"
+        android:layout_margin="24dp">
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="@string/letter_spacing"
+                android:layout_gravity="center_vertical"/>
+            <SeekBar
+                android:id="@+id/letter_spacing_seek_bar"
+                android:layout_width="match_parent"
+                android:layout_height="48dp"/>
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="@string/line_spacing"
+                android:layout_gravity="center_vertical"/>
+            <SeekBar
+                android:id="@+id/line_spacing_seek_bar"
+                android:layout_width="match_parent"
+                android:layout_height="48dp"/>
+    </LinearLayout>
 </RelativeLayout>
diff --git a/app/src/main/res/values-v21/styles.xml b/app/src/main/res/values-v21/styles.xml
index 65d0c39..89f0ced 100644
--- a/app/src/main/res/values-v21/styles.xml
+++ b/app/src/main/res/values-v21/styles.xml
@@ -1,8 +1,8 @@
 <resources>>
     <style name="AppTheme.NoActionBar">
         <item name="windowActionBar">false</item>
-        <item name="windowNoTitle">true</item>
-        <item name="android:windowDrawsSystemBarBackgrounds">true</item>
-        <item name="android:statusBarColor">@android:color/transparent</item>
+<!--        <item name="windowNoTitle">true</item>-->
+<!--        <item name="android:windowDrawsSystemBarBackgrounds">true</item>-->
+<!--        <item name="android:statusBarColor">@android:color/transparent</item>-->
     </style>
 </resources>
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index 9e2400a..db67bbf 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -3,7 +3,7 @@
     <color name="primary">#4CAF50</color>
     <color name="primary_dark">#388E3C</color>
     <color name="primary_light">#C8E6C9</color>
-    <color name="accent">#9E9E9E</color>
+    <color name="accent">#3F51B5</color>
     <color name="primary_text">#212121</color>
     <color name="secondary_text">#727272</color>
     <color name="icons">#FFFFFF</color>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 0ffe693..c5d9f23 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -3,4 +3,6 @@
     <string name="action_settings">Settings</string>
 
     <string name="hint">HINT</string>
+    <string name="letter_spacing">Letter Spacing:</string>
+    <string name="line_spacing">Line Spacing:</string>
 </resources>
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
index a15a881..4bb6418 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.DarkActionBar">
+    <style name="AppTheme" parent="Theme.MaterialComponents.Light.NoActionBar">
         <!-- Customize your theme here. -->
         <item name="colorPrimary">@color/primary</item>
         <item name="colorPrimaryDark">@color/primary_dark</item>
@@ -9,7 +9,7 @@
     </style>
     <style name="AppTheme.NoActionBar">
         <item name="windowActionBar">false</item>
-        <item name="windowNoTitle">true</item>
+<!--        <item name="windowNoTitle">true</item>-->
     </style>
     <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />
     <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />
diff --git a/build.gradle b/build.gradle
index be515a8..50765f5 100644
--- a/build.gradle
+++ b/build.gradle
@@ -2,10 +2,11 @@
 
 buildscript {
     repositories {
+        google()
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:1.3.0'
+        classpath 'com.android.tools.build:gradle:3.5.0-rc01'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -14,7 +15,9 @@ buildscript {
 
 allprojects {
     repositories {
+        google()
         jcenter()
+        mavenCentral()
     }
 }
 
diff --git a/gradle.properties b/gradle.properties
index 1d3591c..8b8e206 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,18 +1,20 @@
 # Project-wide Gradle settings.
-
 # IDE (e.g. Android Studio) users:
 # Gradle settings configured through the IDE *will override*
 # any settings specified in this file.
-
 # For more details on how to configure your build environment visit
 # http://www.gradle.org/docs/current/userguide/build_environment.html
-
 # Specifies the JVM arguments used for the daemon process.
 # The setting is particularly useful for tweaking memory settings.
-# Default value: -Xmx10248m -XX:MaxPermSize=256m
-# org.gradle.jvmargs=-Xmx2048m -XX:MaxPermSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
-
+org.gradle.jvmargs=-Xmx1536m
 # When configured, Gradle will run in incubating parallel mode.
 # This option should only be used with decoupled projects. More details, visit
 # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
-# org.gradle.parallel=true
\ No newline at end of file
+# org.gradle.parallel=true
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app's APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
+android.useAndroidX=true
+org.gradle.parallel=true
+# Automatically convert third-party libraries to use AndroidX
+android.enableJetifier=true
\ No newline at end of file
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 37d1316..d008949 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip
diff --git a/lib/build.gradle b/lib/build.gradle
index 8f29548..7656113 100644
--- a/lib/build.gradle
+++ b/lib/build.gradle
@@ -1,12 +1,11 @@
 apply plugin: 'com.android.library'
 
 android {
-    compileSdkVersion 23
-    buildToolsVersion "23.0.1"
+    compileSdkVersion 28
 
     defaultConfig {
-        minSdkVersion 14
-        targetSdkVersion 23
+        minSdkVersion 21
+        targetSdkVersion 28
         versionCode 1
         versionName "1.0"
     }
@@ -19,7 +18,6 @@ android {
 }
 
 dependencies {
-    compile fileTree(dir: 'libs', include: ['*.jar'])
-    testCompile 'junit:junit:4.12'
-    compile 'com.android.support:appcompat-v7:23.1.0'
+    testImplementation 'junit:junit:4.12'
+    implementation "androidx.appcompat:appcompat:1.1.0-rc01"
 }
diff --git a/lib/src/main/java/com/autofit/et/lib/AutoFitEditText.java b/lib/src/main/java/com/autofit/et/lib/AutoFitEditText.java
index 514e83d..915c5b8 100644
--- a/lib/src/main/java/com/autofit/et/lib/AutoFitEditText.java
+++ b/lib/src/main/java/com/autofit/et/lib/AutoFitEditText.java
@@ -12,12 +12,13 @@
 import android.util.AttributeSet;
 import android.util.SparseIntArray;
 import android.util.TypedValue;
-import android.widget.EditText;
+
+import androidx.appcompat.widget.AppCompatEditText;
 
 /**
  * Created by varsovski on 29-Oct-15.
  */
-public class AutoFitEditText extends EditText {
+public class AutoFitEditText extends AppCompatEditText {
     private static final int NO_LINE_LIMIT = -1;
     private final RectF _availableSpaceRect = new RectF();
     private final SparseIntArray _textCachedSizes = new SparseIntArray();
@@ -72,6 +73,7 @@ public AutoFitEditText(final Context context, final AttributeSet attrs,
             public int onTestSize(final int suggestedSize,
                                   final RectF availableSPace) {
                 paint.setTextSize(suggestedSize);
+                paint.setLetterSpacing(getLetterSpacing());
                 final String text = getText().toString();
                 final boolean singleline = getMaxLines() == 1;
                 if (singleline) {
@@ -172,6 +174,13 @@ public void setLineSpacing(final float add, final float mult) {
         super.setLineSpacing(add, mult);
         _spacingMult = mult;
         _spacingAdd = add;
+        reAdjust();
+    }
+
+    @Override
+    public void setLetterSpacing(float letterSpacing) {
+        super.setLetterSpacing(letterSpacing);
+        reAdjust();
     }
 
     /**
@@ -197,8 +206,10 @@ private void adjustTextSize() {
             return;
         final int startSize =  Math.round(_minTextSize);
         final int heightLimit = getMeasuredHeight()
-                - getCompoundPaddingBottom() - getCompoundPaddingTop();
-        _widthLimit = getMeasuredWidth() - getCompoundPaddingLeft()
+                - getCompoundPaddingBottom()
+                - getCompoundPaddingTop();
+        _widthLimit = getMeasuredWidth()
+                - getCompoundPaddingLeft()
                 - getCompoundPaddingRight();
         if (_widthLimit <= 0)
             return;