fix: upgrade to flutter new version 3.20 or later

android/build.gradle

@@ -8,7 +8,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.2.1'
+        classpath 'com.android.tools.build:gradle:8.3.1'
     }
 }
 
@@ -25,10 +25,11 @@ rootProject.allprojects {
 apply plugin: 'com.android.library'
 
 android {
-    compileSdkVersion 28
+    namespace 'com.sayegh.move_to_background'
+    compileSdkVersion 34
 
     defaultConfig {
-        minSdkVersion 16
+        minSdkVersion 21
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
     lintOptions {

android/src/main/java/com/sayegh/move_to_background/MoveToBackgroundPlugin.java

@@ -10,7 +10,6 @@
 import io.flutter.plugin.common.MethodChannel;
 import io.flutter.plugin.common.MethodChannel.MethodCallHandler;
 import io.flutter.plugin.common.MethodChannel.Result;
-import io.flutter.plugin.common.PluginRegistry.Registrar;
 import io.flutter.embedding.engine.plugins.activity.ActivityAware;
 import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding;
 
@@ -21,13 +20,13 @@ public class MoveToBackgroundPlugin implements FlutterPlugin, MethodCallHandler,
   private static Activity activity;
 
   /** Plugin registration. */
-  public static void registerWith(Registrar registrar) {
-    if (registrar.activity() != null) {
-      MoveToBackgroundPlugin.activity = registrar.activity();
-    }
-    MoveToBackgroundPlugin plugin = new MoveToBackgroundPlugin();
-    plugin.setupChannel(registrar.messenger(), registrar.context());
-  }
+//  public static void registerWith(Registrar registrar) {
+//    if (registrar.activity() != null) {
+//      MoveToBackgroundPlugin.activity = registrar.activity();
+//    }
+//    MoveToBackgroundPlugin plugin = new MoveToBackgroundPlugin();
+//    plugin.setupChannel(registrar.messenger(), registrar.context());
+//  }
 
   @Override
   @SuppressWarnings("deprecation")

example/android/app/build.gradle

@@ -1,3 +1,8 @@
+plugins {
+    id "com.android.application"
+    id "dev.flutter.flutter-gradle-plugin"
+}
+
 def localProperties = new Properties()
 def localPropertiesFile = rootProject.file('local.properties')
 if (localPropertiesFile.exists()) {
@@ -21,21 +26,17 @@ if (flutterVersionName == null) {
     flutterVersionName = '1.0'
 }
 
-apply plugin: 'com.android.application'
-apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
-
 android {
-    compileSdkVersion 28
-
+    compileSdkVersion 36
+    namespace "com.sayegh.move_to_background_example"
     lintOptions {
         disable 'InvalidPackage'
     }
 
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.sayegh.move_to_background_example"
-        minSdkVersion 16
-        targetSdkVersion 28
+        minSdkVersion 21
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

example/android/app/src/main/java/com/sayegh/move_to_background_example/MainActivity.java

@@ -1,13 +1,7 @@
 package com.sayegh.move_to_background_example;
 
-import android.os.Bundle;
-import io.flutter.app.FlutterActivity;
-import io.flutter.plugins.GeneratedPluginRegistrant;
+import  io.flutter.embedding.android.FlutterActivity;
 
 public class MainActivity extends FlutterActivity {
-  @Override
-  protected void onCreate(Bundle savedInstanceState) {
-    super.onCreate(savedInstanceState);
-    GeneratedPluginRegistrant.registerWith(this);
-  }
+
 }

example/android/build.gradle

@@ -1,18 +1,7 @@
-buildscript {
-    repositories {
-        google()
-        jcenter()
-    }
-
-    dependencies {
-        classpath 'com.android.tools.build:gradle:3.2.1'
-    }
-}
-
 allprojects {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 }
 
@@ -24,6 +13,6 @@ subprojects {
     project.evaluationDependsOn(':app')
 }
 
-task clean(type: Delete) {
+tasks.register("clean", Delete) {
     delete rootProject.buildDir
 }

example/android/gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.2-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-all.zip

example/android/settings.gradle

@@ -1,15 +1,26 @@
-include ':app'
+pluginManagement {
+    def flutterSdkPath = {
+        def properties = new Properties()
+        file("local.properties").withInputStream { properties.load(it) }
+        def flutterSdkPath = properties.getProperty("flutter.sdk")
+        assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
+        return flutterSdkPath
+    }
+    settings.ext.flutterSdkPath = flutterSdkPath()
 
-def flutterProjectRoot = rootProject.projectDir.parentFile.toPath()
+    includeBuild("${settings.ext.flutterSdkPath}/packages/flutter_tools/gradle")
 
-def plugins = new Properties()
-def pluginsFile = new File(flutterProjectRoot.toFile(), '.flutter-plugins')
-if (pluginsFile.exists()) {
-    pluginsFile.withReader('UTF-8') { reader -> plugins.load(reader) }
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
 }
 
-plugins.each { name, path ->
-    def pluginDirectory = flutterProjectRoot.resolve(path).resolve('android').toFile()
-    include ":$name"
-    project(":$name").projectDir = pluginDirectory
+plugins {
+    id "dev.flutter.flutter-plugin-loader" version "1.0.0"
+    id "com.android.application" version "8.3.0" apply false
+//    id "org.jetbrains.kotlin.android" version "1.7.10" apply false
 }
+
+include ":app"