Update Android plugin Gradle configuration

We require a very recent Kotlin version (1.9.0) due to MapLibre native dependency.
These changes ensure that the plugin requires the same version.
Also remove unused imports.

maplibre_gl/android/build.gradle

@@ -2,13 +2,15 @@ group 'org.maplibre.maplibregl'
 version '1.0-SNAPSHOT'
 
 buildscript {
+    ext.kotlin_version = '1.9.0'
     repositories {
         google()
         mavenCentral()
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.1.3'
+        classpath 'com.android.tools.build:gradle:7.2.2'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
 
@@ -20,15 +22,15 @@ rootProject.allprojects {
 }
 
 apply plugin: 'com.android.library'
-apply plugin: 'org.jetbrains.kotlin.android'
+apply plugin: 'kotlin-android'
 
 android {
     if (project.android.hasProperty("namespace")) {
         namespace 'org.maplibre.maplibregl'
     }
 
     compileSdkVersion 34
-    ndkVersion "20.1.5948944"
+    ndkVersion "26.1.10909125"
 
     defaultConfig {
         minSdkVersion 21

maplibre_gl/android/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,5 @@
-#Sat Mar 06 23:07:28 CET 2021
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.5.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.7-all.zip

maplibre_gl/android/src/main/java/org/maplibre/maplibregl/MapLibreMapsPlugin.java

@@ -4,20 +4,14 @@
 
 package org.maplibre.maplibregl;
 
-import android.app.Activity;
-import android.app.Application;
-import android.os.Bundle;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.lifecycle.Lifecycle;
-import androidx.lifecycle.LifecycleOwner;
-import androidx.lifecycle.LifecycleRegistry;
 import io.flutter.embedding.engine.plugins.FlutterPlugin;
 import io.flutter.embedding.engine.plugins.activity.ActivityAware;
 import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding;
 import io.flutter.embedding.engine.plugins.lifecycle.HiddenLifecycleReference;
 import io.flutter.plugin.common.MethodChannel;
-import io.flutter.plugin.common.PluginRegistry.Registrar;
 
 /**
  * Plugin for controlling a set of MapLibreMap views to be shown as overlays on top of the Flutter
@@ -27,8 +21,6 @@
  */
 public class MapLibreMapsPlugin implements FlutterPlugin, ActivityAware {
 
-  private static final String VIEW_TYPE = "plugins.flutter.io/maplibre_gl";
-
   static FlutterAssets flutterAssets;
   private Lifecycle lifecycle;