Android: Migrate deprecated support library to AndroidX

platform/android/java/app/config.gradle

@@ -4,18 +4,18 @@ ext.versions = [
     minSdk             : 18,
     targetSdk          : 29,
     buildTools         : '29.0.3',
-    supportCoreUtils   : '28.0.0',
+    supportCoreUtils   : '1.0.0',
     kotlinVersion      : '1.3.61',
-    v4Support          : '28.0.0'
+    v4Support          : '1.0.0'
 
 ]
 
 ext.libraries = [
     androidGradlePlugin: "com.android.tools.build:gradle:$versions.androidGradlePlugin",
-    supportCoreUtils   : "com.android.support:support-core-utils:$versions.supportCoreUtils",
+    supportCoreUtils   : "androidx.legacy:legacy-support-core-utils:$versions.supportCoreUtils",
     kotlinGradlePlugin : "org.jetbrains.kotlin:kotlin-gradle-plugin:$versions.kotlinVersion",
     kotlinStdLib       : "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$versions.kotlinVersion",
-    v4Support          : "com.android.support:support-v4:$versions.v4Support"
+    v4Support          : "androidx.legacy:legacy-support-v4:$versions.v4Support"
 ]
 
 ext.getExportPackageName = { ->

platform/android/java/gradle.properties

@@ -7,6 +7,9 @@
 # For more details on how to configure your build environment visit
 # http://www.gradle.org/docs/current/userguide/build_environment.html
 
+android.enableJetifier=true
+android.useAndroidX=true
+
 # Specifies the JVM arguments used for the daemon process.
 # The setting is particularly useful for tweaking memory settings.
 org.gradle.jvmargs=-Xmx1536m

platform/android/java/lib/src/com/google/android/vending/expansion/downloader/impl/DownloadNotification.java

@@ -29,9 +29,9 @@ import com.google.android.vending.expansion.downloader.IDownloaderClient;
 import android.app.NotificationManager;
 import android.app.PendingIntent;
 import android.content.Context;
-import android.os.Build;
 import android.os.Messenger;
-import android.support.v4.app.NotificationCompat;
+
+import androidx.core.app.NotificationCompat;
 
 /**
  * This class handles displaying the notification associated with the download

platform/android/java/lib/src/org/godotengine/godot/Godot.java

@@ -66,10 +66,6 @@ import android.os.Messenger;
 import android.os.VibrationEffect;
 import android.os.Vibrator;
 import android.provider.Settings.Secure;
-import android.support.annotation.CallSuper;
-import android.support.annotation.Keep;
-import android.support.annotation.NonNull;
-import android.support.v4.app.FragmentActivity;
 import android.view.Display;
 import android.view.KeyEvent;
 import android.view.MotionEvent;
@@ -85,6 +81,11 @@ import android.widget.FrameLayout;
 import android.widget.ProgressBar;
 import android.widget.TextView;
 
+import androidx.annotation.CallSuper;
+import androidx.annotation.Keep;
+import androidx.annotation.NonNull;
+import androidx.fragment.app.FragmentActivity;
+
 import com.google.android.vending.expansion.downloader.DownloadProgressInfo;
 import com.google.android.vending.expansion.downloader.DownloaderClientMarshaller;
 import com.google.android.vending.expansion.downloader.DownloaderServiceMarshaller;

platform/android/java/lib/src/org/godotengine/godot/plugin/GodotPlugin.java

@@ -35,13 +35,13 @@ import org.godotengine.godot.Godot;
 
 import android.app.Activity;
 import android.content.Intent;
-import android.support.annotation.NonNull;
-import android.support.annotation.Nullable;
-import android.text.TextUtils;
 import android.util.Log;
 import android.view.Surface;
 import android.view.View;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
 import java.lang.reflect.Method;
 import java.util.ArrayList;
 import java.util.Collections;

platform/android/java/lib/src/org/godotengine/godot/plugin/GodotPluginRegistry.java

@@ -35,13 +35,13 @@ import org.godotengine.godot.Godot;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageManager;
 import android.os.Bundle;
-import android.support.annotation.Nullable;
 import android.text.TextUtils;
 import android.util.Log;
 
+import androidx.annotation.Nullable;
+
 import java.lang.reflect.Constructor;
 import java.lang.reflect.InvocationTargetException;
-import java.util.Arrays;
 import java.util.Collection;
 import java.util.HashSet;
 import java.util.Set;

platform/android/java/lib/src/org/godotengine/godot/plugin/SignalInfo.java

@@ -30,9 +30,10 @@
 
 package org.godotengine.godot.plugin;
 
-import android.support.annotation.NonNull;
 import android.text.TextUtils;
 
+import androidx.annotation.NonNull;
+
 import java.util.Arrays;
 
 /**

platform/android/java/lib/src/org/godotengine/godot/utils/PermissionsUtil.java

@@ -37,9 +37,10 @@ import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.PermissionInfo;
 import android.os.Build;
-import android.support.v4.content.ContextCompat;
 import android.util.Log;
 
+import androidx.core.content.ContextCompat;
+
 import java.util.ArrayList;
 import java.util.List;
 

platform/android/java/plugins/godotpayment/src/main/java/org/godotengine/godot/plugin/payment/GodotPayment.java

@@ -36,9 +36,10 @@ import org.godotengine.godot.GodotLib;
 import org.godotengine.godot.plugin.GodotPlugin;
 
 import android.content.Intent;
-import android.support.annotation.NonNull;
 import android.util.Log;
 
+import androidx.annotation.NonNull;
+
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;