fix: build issue for android

Author: peilinok

android/build.gradle

@@ -30,7 +30,7 @@ android {
     compileSdkVersion safeExtGet('compileSdkVersion', 31)
 
     defaultConfig {
-        minSdkVersion safeExtGet('minSdkVersion', 16)
+        minSdkVersion safeExtGet('minSdkVersion', 21)
 
         consumerProguardFiles 'consumer-rules.pro'
     }

android/consumer-rules.pro

@@ -3,3 +3,5 @@
 -keep class org.jetbrains.** { *; }
 
 -keep class io.agora.**{*;}
+# Suppress ERROR: R8: Missing class com.google.devtools.build.android.desugar.runtime.ThrowableExtension
+-dontwarn com.google.devtools.build.android.desugar.runtime.ThrowableExtension

example/android/app/build.gradle

@@ -26,6 +26,8 @@ apply plugin: 'kotlin-android'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
+    namespace "io.agora.agora_rtc_ng_example"
+    
     compileSdkVersion 34
 
     compileOptions {
@@ -44,7 +46,7 @@ android {
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "io.agora.agora_rtc_ng_example"
-        minSdkVersion 18
+        minSdkVersion 21
         targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName

example/android/build.gradle

@@ -1,13 +1,13 @@
 buildscript {
     // Min kotlin version for Flutter SDK 3.24
-    ext.kotlin_version = '1.7.0'
+    ext.kotlin_version = '1.9.10'
     repositories {
         google()
         mavenCentral()
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:7.1.2'
+        classpath 'com.android.tools.build:gradle:8.7.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }

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

@@ -3,5 +3,5 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.10-all.zip
 

pubspec.yaml

@@ -17,7 +17,7 @@ dependencies:
   ffi: '>=1.1.2'
   async: ^2.8.2
   meta: ^1.7.0
-  iris_method_channel: 2.0.0
+  iris_method_channel: '>=2.2.0'
   js: '>=0.6.3'
 dev_dependencies:
   flutter_test: