updated sdks...

AutoFitTextViewLibrary/build.gradle

@@ -1,12 +1,11 @@
 apply plugin: 'com.android.library'
 
 android {
-    compileSdkVersion 24
-    buildToolsVersion "23.0.3"
+    compileSdkVersion 28
 
     defaultConfig {
-        minSdkVersion 9
-        targetSdkVersion 24
+        minSdkVersion 14
+        targetSdkVersion 28
         versionCode 1
         versionName "1.0"
     }
@@ -31,5 +30,5 @@ android {
 }
 
 dependencies {
-    compile 'com.android.support:appcompat-v7:24.0.0'
+    implementation 'androidx.appcompat:appcompat:1.0.2'
 }

AutoFitTextViewLibrary/src/com/lb/auto_fit_textview/AutoResizeTextView.java

@@ -6,14 +6,15 @@
 import android.graphics.RectF;
 import android.graphics.Typeface;
 import android.os.Build;
-import android.support.v7.widget.AppCompatTextView;
 import android.text.Layout.Alignment;
 import android.text.StaticLayout;
 import android.text.TextPaint;
 import android.text.method.TransformationMethod;
 import android.util.AttributeSet;
 import android.util.TypedValue;
 
+import androidx.appcompat.widget.AppCompatTextView;
+
 /**
  * a textView that is able to self-adjust its font size depending on the min and max size of the font, and its own size.<br/>
  * code is heavily based on this StackOverflow thread:

AutoFitTextViewSample/build.gradle

@@ -1,13 +1,12 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 24
-    buildToolsVersion "23.0.3"
+    compileSdkVersion 28
 
     defaultConfig {
         applicationId "com.example.autofittextviewsample"
-        minSdkVersion 16
-        targetSdkVersion 24
+        minSdkVersion 14
+        targetSdkVersion 28
         versionCode 1
         versionName "1.0"
     }
@@ -32,8 +31,8 @@ android {
 }
 
 dependencies {
-    compile fileTree(dir: 'libs', include: ['*.jar'])
-    compile 'com.android.support:appcompat-v7:24.1.1'
-    compile 'com.android.support:recyclerview-v7:24.1.1'
-    compile project(':AutoFitTextViewLibrary')
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation 'androidx.appcompat:appcompat:1.0.2'
+    implementation 'androidx.recyclerview:recyclerview:1.0.0'
+    implementation project(':AutoFitTextViewLibrary')
 }

AutoFitTextViewSample/res/layout/activity_main2.xml

@@ -11,8 +11,8 @@
     android:paddingTop="@dimen/activity_vertical_margin"
     tools:context="com.example.autofittextviewsample.Main2Activity">
 
-    <android.support.v7.widget.RecyclerView
+    <androidx.recyclerview.widget.RecyclerView
         android:layout_width="match_parent" android:id="@android:id/list"
-        android:layout_height="match_parent"></android.support.v7.widget.RecyclerView>
+        android:layout_height="match_parent"></androidx.recyclerview.widget.RecyclerView>
 
 </RelativeLayout>

AutoFitTextViewSample/src/com/example/autofittextviewsample/Main2Activity.java

@@ -1,10 +1,10 @@
 package com.example.autofittextviewsample;
 
 import android.os.Bundle;
-import android.support.v7.app.AppCompatActivity;
-import android.support.v7.widget.LinearLayoutManager;
-import android.support.v7.widget.RecyclerView;
-import android.support.v7.widget.RecyclerView.Adapter;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+import androidx.recyclerview.widget.RecyclerView.Adapter;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;

AutoFitTextViewSample/src/com/example/autofittextviewsample/MainActivity.java

@@ -3,7 +3,7 @@
 import android.content.Intent;
 import android.net.Uri;
 import android.os.Bundle;
-import android.support.v7.app.AppCompatActivity;
+import androidx.appcompat.app.AppCompatActivity;
 import android.text.Editable;
 import android.text.TextUtils.TruncateAt;
 import android.text.TextWatcher;

build.gradle

@@ -3,9 +3,10 @@
 buildscript {
     repositories {
         jcenter()
+        google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.2.0'
+        classpath 'com.android.tools.build:gradle:3.3.0'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -15,5 +16,6 @@ buildscript {
 allprojects {
     repositories {
         jcenter()
+        google()
     }
 }

gradle.properties

@@ -16,3 +16,5 @@
 # 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
+android.enableJetifier=true
+android.useAndroidX=true

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Thu Sep 22 09:40:40 IDT 2016
+#Wed Feb 06 23:21:12 IST 2019
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.14.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.1.1-all.zip