Updated the code with androidx libraries and latest sdks

app/build.gradle

@@ -1,13 +1,13 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 23
-    buildToolsVersion = "23.0.1"
+    compileSdkVersion 29
+    buildToolsVersion = "29.0.3"
 
     defaultConfig {
         applicationId "saulmm.myapplication"
         minSdkVersion 21
-        targetSdkVersion 23
+        targetSdkVersion 29
         versionCode 1
         versionName "1.0"
     }
@@ -20,9 +20,9 @@ android {
 }
 
 dependencies {
-    compile fileTree(dir: 'libs', include: ['*.jar'])
-    compile 'com.android.support:appcompat-v7:23.2.1'
-    compile 'com.android.support:design:23.2.1'
-    compile 'com.android.support:cardview-v7:23.2.1'
-    compile 'de.hdodenhof:circleimageview:1.3.0'
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'com.google.android.material:material:1.1.0'
+    implementation 'androidx.cardview:cardview:1.0.0'
+    implementation 'de.hdodenhof:circleimageview:1.3.0'
 }

app/src/main/java/saulmm/myapplication/AvatarImageBehavior.java

@@ -2,11 +2,12 @@
 
 import android.content.Context;
 import android.content.res.TypedArray;
-import android.support.design.widget.CoordinatorLayout;
-import android.support.v7.widget.Toolbar;
 import android.util.AttributeSet;
 import android.view.View;
 
+import androidx.appcompat.widget.Toolbar;
+import androidx.coordinatorlayout.widget.CoordinatorLayout;
+
 import de.hdodenhof.circleimageview.CircleImageView;
 
 @SuppressWarnings("unused")

app/src/main/java/saulmm/myapplication/MainActivity.java

@@ -1,10 +1,6 @@
 package saulmm.myapplication;
 
 import android.os.Bundle;
-import android.support.design.widget.AppBarLayout;
-import android.support.design.widget.CollapsingToolbarLayout;
-import android.support.v7.app.AppCompatActivity;
-import android.support.v7.widget.Toolbar;
 import android.view.Menu;
 import android.view.View;
 import android.view.animation.AlphaAnimation;
@@ -13,6 +9,11 @@
 import android.widget.LinearLayout;
 import android.widget.TextView;
 
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.appcompat.widget.Toolbar;
+
+import com.google.android.material.appbar.AppBarLayout;
+
 public class MainActivity extends AppCompatActivity
     implements AppBarLayout.OnOffsetChangedListener {
 

app/src/main/res/layout/activity_main.xml

@@ -1,4 +1,4 @@
-<android.support.design.widget.CoordinatorLayout
+<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"
@@ -7,14 +7,14 @@
     tools:ignore="RtlHardcoded"
     >
 
-    <android.support.design.widget.AppBarLayout
+    <com.google.android.material.appbar.AppBarLayout
         android:id="@+id/main.appbar"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
         >
 
-        <android.support.design.widget.CollapsingToolbarLayout
+        <com.google.android.material.appbar.CollapsingToolbarLayout
             android:id="@+id/main.collapsing"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
@@ -72,11 +72,11 @@
 
                 </LinearLayout>
             </FrameLayout>
-        </android.support.design.widget.CollapsingToolbarLayout>
-    </android.support.design.widget.AppBarLayout>
+        </com.google.android.material.appbar.CollapsingToolbarLayout>
+    </com.google.android.material.appbar.AppBarLayout>
 
 
-    <android.support.v4.widget.NestedScrollView
+    <androidx.core.widget.NestedScrollView
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:scrollbars="none"
@@ -85,7 +85,7 @@
 
         >
 
-        <android.support.v7.widget.CardView
+        <androidx.cardview.widget.CardView
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_margin="8dp"
@@ -100,12 +100,12 @@
                 android:text="@string/lorem"
                 android:textSize="18sp"
                 />
-        </android.support.v7.widget.CardView>
+        </androidx.cardview.widget.CardView>
 
 
-    </android.support.v4.widget.NestedScrollView>
+    </androidx.core.widget.NestedScrollView>
 
-    <android.support.v7.widget.Toolbar
+    <androidx.appcompat.widget.Toolbar
         android:id="@+id/main.toolbar"
         android:layout_width="match_parent"
         android:layout_height="?attr/actionBarSize"
@@ -138,7 +138,7 @@
                 />
 
         </LinearLayout>
-    </android.support.v7.widget.Toolbar>
+    </androidx.appcompat.widget.Toolbar>
 
     <de.hdodenhof.circleimageview.CircleImageView
         android:layout_width="@dimen/image_width"
@@ -154,4 +154,4 @@
         app:startToolbarPosition="2dp"
         app:startXPosition="2dp"
         />
-</android.support.design.widget.CoordinatorLayout>
+</androidx.coordinatorlayout.widget.CoordinatorLayout>

build.gradle

@@ -4,14 +4,16 @@
 buildscript {
     repositories {
         jcenter()
+        google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.2.0-alpha3'
+        classpath 'com.android.tools.build:gradle:4.0.0'
     }
 }
 
 allprojects {
     repositories {
         jcenter()
+        google()
     }
 }

gradle.properties

@@ -15,4 +15,6 @@
 # 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
+# org.gradle.parallel=true
+android.enableJetifier=true
+android.useAndroidX=true