Fix android gradle configuration

Author: matux

rollbar_flutter/android/build.gradle

@@ -28,9 +28,11 @@ rootProject.allprojects {
     }
 }
 
-apply plugin: 'com.android.library'
-apply plugin: 'checkstyle'
-apply plugin: "com.github.spotbugs"
+plugins {
+    id "com.android.library"
+    id "checkstyle"
+    id "com.github.spotbugs"
+}
 
 android {
     compileSdkVersion 31

rollbar_flutter/example/android/app/build.gradle

@@ -6,11 +6,6 @@ if (localPropertiesFile.exists()) {
     }
 }
 
-def flutterRoot = localProperties.getProperty('flutter.sdk')
-if (flutterRoot == null) {
-    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
-}
-
 def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
 if (flutterVersionCode == null) {
     flutterVersionCode = '1'
@@ -21,8 +16,10 @@ if (flutterVersionName == null) {
     flutterVersionName = '1.0'
 }
 
-apply plugin: 'com.android.application'
-apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
+plugins {
+    id "com.android.application"
+    id "dev.flutter.flutter-gradle-plugin"
+}
 
 android {
     compileSdkVersion flutter.compileSdkVersion
@@ -38,7 +35,7 @@ android {
 
     defaultConfig {
         applicationId "com.rollbar.flutter.example"
-        minSdkVersion 19
+        minSdkVersion flutter.minSdkVersion
         targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName

rollbar_flutter/example/android/build.gradle

@@ -1,29 +1,24 @@
-buildscript {
-    repositories {
-        google()
-        mavenCentral()
-    }
+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
+    }()
 
-    dependencies {
-        classpath 'com.android.tools.build:gradle:7.1.2'
-    }
-}
+    includeBuild("$flutterSdkPath/packages/flutter_tools/gradle")
 
-allprojects {
     repositories {
         google()
         mavenCentral()
+        gradlePluginPortal()
     }
 }
 
-rootProject.buildDir = '../build'
-subprojects {
-    project.buildDir = "${rootProject.buildDir}/${project.name}"
-}
-subprojects {
-    project.evaluationDependsOn(':app')
+plugins {
+    id "dev.flutter.flutter-plugin-loader" version "1.0.0"
+    id "com.android.application" version "7.1.2" apply false
 }
 
-tasks.register("clean", Delete) {
-    delete rootProject.buildDir
-}
+include ":app"

rollbar_flutter/example/android/settings.gradle

@@ -1,3 +1,25 @@
+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
+    }()
+
+    includeBuild("$flutterSdkPath/packages/flutter_tools/gradle")
+
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+
+plugins {
+    id "dev.flutter.flutter-plugin-loader" version "1.0.0"
+}
+
 include ':app'
 
 def localPropertiesFile = new File(rootProject.projectDir, "local.properties")
@@ -6,6 +28,6 @@ def properties = new Properties()
 assert localPropertiesFile.exists()
 localPropertiesFile.withReader("UTF-8") { reader -> properties.load(reader) }
 
-def flutterSdkPath = properties.getProperty("flutter.sdk")
-assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
-apply from: "$flutterSdkPath/packages/flutter_tools/gradle/app_plugin_loader.gradle"
+// def flutterSdkPath = properties.getProperty("flutter.sdk")
+// assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
+// apply from: "$flutterSdkPath/packages/flutter_tools/gradle/app_plugin_loader.gradle"