how to fix Android Annotations 4.6.0 compile with android Studio 3.5 and 3.5.0 gradle

Question

I updated Android studio to 3.5 but there is a problem when I use android annotations

Gradle may disable incremental compilation as the following annotation processors are not incremental: jetified-androidannotations-4.6.0.jar (org.androidannotations:androidannotations:4.6.0).
Consider setting the experimental feature flag android.enableSeparateAnnotationProcessing=true in the gradle.properties file to run annotation processing in a separate task and make compilation incremental

I've put android.enableSeparateAnnotationProcessing=true in the gradle.properties file

but it's say that

INFO: The option setting 'android.enableSeparateAnnotationProcessing=true' is experimental and unsupported. The current default is 'false'.

Could not find the AndroidManifest.xml file

Answer 1

I had almost the same problem and couldn't build my app after updating android studio and gradle to 3.5 but according to this answer I added this to my defaultConfig{} in app gradle and problem solved!

javaCompileOptions {
        annotationProcessorOptions {
            arguments = [
                    "androidManifestFile": "$projectDir/src/main/AndroidManifest.xml".toString()
            ]
        }
    }

Answer 2

There is 2 way of fixing this issue

Method One - Use Snapshot version

Current Annotation lib version is 4.6, to fix these error temporary you can use a Snapshot version

add the following URL in Project-level Gradle

buildscript {
repositories {
    maven { url = 'https://oss.sonatype.org/content/repositories/snapshots' }

}

Method Two - Use javaCompileOptions

Add following code in gradle DSL

  defaultConfig {
    javaCompileOptions {
        annotationProcessorOptions {
            arguments = ["resourcePackageName": android.defaultConfig.applicationId]
            arguments = ["androidManifestFile": "$projectDir/src/main/AndroidManifest.xml".toString()]
        }
    }
}

Hope it will work :)