How to get rid of Incremental annotation processing requested warning?

Question

I have just started using android development and trying to use Room library. Since yesterday I am facing this warning message

w: [kapt] Incremental a

Answer 1

Starting from version 1.3.30, kapt supports incremental annotation processing as an experimental feature. Yet, starting from version 1.3.50, incremental annotation processing is enabled by default.

So, you must add kapt.incremental.apt=true line to your gradle.properties file to enable incremental annotation processing if your kapt version is greater than or equal to 1.3.30 and lower than 1.3.50. Otherwise; you don't have to set kapt.incremental.apt to true to enable it. Although, you can set it to false to disable it if you like.

Besides all of that; incremental annotation processing requires incremental compilation to be enabled as well. So, you must add kotlin.incremental=true line to your gradle.properties file to be able to benefit from incremental annotation processing feature.

Note that incremental annotation processing option of Room is ON by default starting from version 2.3.0-alpha02. It means you don't have to set room.incremental argument to true if your version of the library is greater than or equal to this. To learn more, see issue #112110217.

Also note that if you're using Android Gradle Plugin 3.6.x or newer, incremental annotation processing option is ON by default for Data Binding. So, you don't have to add android.databinding.incremental=true line to your gradle.properties file. To learn more, see issue #110061530.