Make it work

app/build.gradle

@@ -4,15 +4,15 @@ apply plugin: 'kotlin-kapt'
 apply plugin: 'realm-android'
 
 android {
-    compileSdkVersion 27
+    compileSdkVersion 29
     buildToolsVersion '28.0.3'
     defaultConfig {
         applicationId "eu.droogers.smsmatrix"
         minSdkVersion 23
-        targetSdkVersion 27
+        targetSdkVersion 29
         versionCode 12
         versionName "0.0.12"
-        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
     buildTypes {
         release {
@@ -34,13 +34,14 @@ android {
 }
 
 dependencies {
-    implementation 'com.android.support:appcompat-v7:27.1.1'
+    implementation 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'androidx.preference:preference:1.1.0'
 
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    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.constraint:constraint-layout:1.1.3'
+    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
     testImplementation 'junit:junit:4.12'
 
     implementation(name: 'matrix-sdk', ext: 'aar')
@@ -49,10 +50,10 @@ dependencies {
     implementation(name: 'olm-sdk', ext: 'aar')
 
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
-    implementation 'com.squareup.retrofit2:retrofit:2.4.0'
+    implementation 'com.squareup.retrofit2:retrofit:2.6.0'
     implementation 'com.squareup.retrofit2:converter-gson:2.4.0'
-    implementation 'com.google.code.gson:gson:2.8.2'
-    implementation 'com.squareup.okhttp3:okhttp:3.10.0'
+    implementation 'com.google.code.gson:gson:2.8.5'
+    implementation 'com.squareup.okhttp3:okhttp:3.12.3'
     implementation 'com.squareup.okhttp3:logging-interceptor:3.10.0'
     implementation 'com.facebook.stetho:stetho:1.5.0'
     implementation 'com.facebook.stetho:stetho-okhttp3:1.5.0'

app/src/androidTest/java/eu/droogers/smsmatrix/ExampleInstrumentedTest.java

@@ -1,8 +1,8 @@
 package eu.droogers.smsmatrix;
 
 import android.content.Context;
-import android.support.test.InstrumentationRegistry;
-import android.support.test.runner.AndroidJUnit4;
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
 
 import org.junit.Test;
 import org.junit.runner.RunWith;

app/src/main/java/eu/droogers/smsmatrix/MainActivity.java

@@ -1,6 +1,5 @@
 package eu.droogers.smsmatrix;
 
-import android.Manifest;
 import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
@@ -12,8 +11,8 @@ import android.view.View;
 import android.widget.Button;
 import android.widget.EditText;
 
-import android.support.v4.app.ActivityCompat;
-import android.support.v4.content.ContextCompat;
+import androidx.core.app.ActivityCompat;
+import androidx.core.content.ContextCompat;
 
 import static android.Manifest.permission.READ_CONTACTS;
 import static android.Manifest.permission.READ_EXTERNAL_STORAGE;

gradle.properties

@@ -9,6 +9,8 @@
 
 # Specifies the JVM arguments used for the daemon process.
 # The setting is particularly useful for tweaking memory settings.
+android.enableJetifier=true
+android.useAndroidX=true
 org.gradle.jvmargs=-Xmx1536m
 
 # When configured, Gradle will run in incubating parallel mode.