Android Studio inline compiler is not showing red lamp errors - android-studio

Question

My Android studio is not showing the red lamp when I have an error but gradle does it when I compile the project. The strangest thing is that only happens in .java files, for xml files is working. I have tried to clean project and rebuild, reinitialize Android Studio and I have checked that power save mode is unselected.
My gradle file:
sourceSets {
main {
manifest.srcFile 'AndroidManifest.xml'
resources.srcDirs = ['src']
res.srcDirs = ['res']
assets.srcDirs = ['assets']
}
debug {
java.srcDirs = ['src', 'build/generated-sources', 'src-debug']
}
release {
java.srcDirs = ['src', 'build/generated-sources', 'src-release']
}
androidTest.setRoot('project-test')
androidTest {
java.srcDirs = ['project-test/src']
resources.srcDirs = ['project-test/src']
aidl.srcDirs = ['project-test/src']
renderscript.srcDirs = ['project-test/src']
res.srcDirs = ['project-test/res']
assets.srcDirs = ['project-test/assets']
}
}
Also my source folder in project is marked as a "J" inside a red circle.
Does someone knows where is the problem?? Thank you!!

Answer 1

Finally I found the problem. The problem was that somehow in gradle file my src foulder was like a resource foulder:
sourceSets {
main {
manifest.srcFile 'AndroidManifest.xml'
--> resources.srcDirs = ['src']
res.srcDirs = ['res']
assets.srcDirs = ['assets']
}
...
}
I changed this line like this:
sourceSets {
main {
manifest.srcFile 'AndroidManifest.xml'
java.srcDirs = ['src']
res.srcDirs = ['res']
assets.srcDirs = ['assets']
}
....
}
I hope this can be useful for other people!