convert to kotlin and migrate to AndroidX

build.gradle

@@ -7,6 +7,7 @@ buildscript {
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:3.4.0'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.50"
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files

example/build.gradle

@@ -8,7 +8,7 @@ android {
         targetSdkVersion 28
         versionCode 1
         versionName "1.0"
-        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
     buildTypes {
         release {
@@ -20,10 +20,10 @@ android {
 
 dependencies {
     implementation fileTree(include: ['*.jar'], dir: 'libs')
-    androidTestImplementation('com.android.support.test.espresso:espresso-core:2.2.2', {
+    androidTestImplementation('androidx.test.espresso:espresso-core:3.1.0', {
         exclude group: 'com.android.support', module: 'support-annotations'
     })
-    implementation 'com.android.support:appcompat-v7:28.0.0'
+    implementation 'androidx.appcompat:appcompat:1.0.0'
     testImplementation 'junit:junit:4.12'
     implementation project(':pinview')
 }

example/src/main/AndroidManifest.xml

@@ -1,6 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.goodiebag.pinview.example">
+    xmlns:tools="http://schemas.android.com/tools"
+    package="com.goodiebag.pinview.example"
+    >
 
     <application
         android:allowBackup="true"

example/src/main/java/com/goodiebag/pinview/example/MainActivity.java

@@ -2,9 +2,10 @@
 
 import android.graphics.Color;
 import android.os.Bundle;
-import android.support.v7.app.AppCompatActivity;
 import android.widget.Toast;
 
+import androidx.appcompat.app.AppCompatActivity;
+
 import com.goodiebag.pinview.Pinview;
 
 public class MainActivity extends AppCompatActivity {

gradle.properties

@@ -15,3 +15,5 @@ org.gradle.jvmargs=-Xmx1536m
 # 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.useAndroidX=true
+android.enableJetifier=true

pinview/build.gradle

@@ -1,5 +1,7 @@
 apply plugin: 'com.android.library'
-
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
+apply plugin: 'kotlin-kapt'
 android {
     compileSdkVersion 28
 
@@ -8,7 +10,7 @@ android {
         targetSdkVersion 28
         versionCode 3
         versionName "1.2"
-        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
 
     }
     buildTypes {
@@ -17,13 +19,19 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
 }
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    androidTestImplementation('com.android.support.test.espresso:espresso-core:2.2.2', {
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.50"
+    implementation 'androidx.core:core-ktx:1.1.0'
+    androidTestImplementation('androidx.test.espresso:espresso-core:3.1.0', {
         exclude group: 'com.android.support', module: 'support-annotations'
     })
-    implementation 'com.android.support:appcompat-v7:28.0.0'
+    implementation 'androidx.appcompat:appcompat:1.0.0'
     testImplementation 'junit:junit:4.12'
 }

pinview/src/androidTest/java/com/goodiebag/pinview/ExampleInstrumentedTest.kt

@@ -0,0 +1,27 @@
+package com.goodiebag.pinview
+
+import android.content.Context
+import android.support.test.InstrumentationRegistry
+import android.support.test.runner.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumentation test, which will execute on an Android device.
+ *
+ * @see [Testing documentation](http://d.android.com/tools/testing)
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    @Throws(Exception::class)
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getTargetContext()
+
+        assertEquals("com.goodiebag.pinview.test", appContext.packageName)
+    }
+}