Getting the project to compile again...

android/app/build.gradle

@@ -22,8 +22,8 @@ if (flutterVersionName == null) {
 }
 
 apply plugin: 'com.android.application'
-apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 apply plugin: 'kotlin-android'
+apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 def keystoreProperties = new Properties()
 def keystorePropertiesFile = rootProject.file('key.properties')
@@ -32,7 +32,11 @@ if (keystorePropertiesFile.exists()) {
 }
 
 android {
-    compileSdkVersion 29
+    compileSdkVersion 30
+
+    sourceSets {
+        main.java.srcDirs += 'src/main/kotlin'
+    }
 
     packagingOptions {
         exclude 'META-INF/proguard/androidx-annotations.pro'
@@ -45,7 +49,7 @@ android {
     defaultConfig {
         applicationId "inventree.inventree_app"
         minSdkVersion 25
-        targetSdkVersion 29
+        targetSdkVersion 30
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
@@ -78,7 +82,8 @@ dependencies {
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'com.android.support.test:runner:1.0.2'
     androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
-    androidTestImplementation 'com.android.support:multidex:1.0.0'
+    androidTestImplementation 'com.android.support:multidex:2.0.1'
+    implementation "androidx.core:core:1.5.0-rc01"
     implementation 'androidx.appcompat:appcompat:1.0.0'
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
 }

android/build.gradle

@@ -8,7 +8,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.2.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
@@ -25,12 +25,7 @@ subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
     project.evaluationDependsOn(':app')
     project.configurations.all {
-        resolutionStrategy.eachDependency { details ->
-            if (details.requested.group == 'androidx.core' &&
-                    !details.requested.name.contains('androidx')) {
-                details.useVersion "1.0.2"
-            }
-        }
+
     }
 }