DataBindingInfo.java being regenerated at every code change

Question

I'm working on fairly large, multi module Android project which is using Data Binding, Dagger 2 and Java mixed with Kotlin.

After the slightest change in the project "code" files (.java and .kt files including activities, custom classes etc) there is a huge (up to 2 minutes) build time. It happens even when I'm adding changes like a new line or modify one character in comment.

I did run Gradle script with --info parameter and got the following hint, it "hangs" on the following task:

Build cache key for task ':AppName:kaptDebugKotlin' is 1a3a53e5f9b0934ab50a25c0133055f2 Up-to-date check for task ':AppName:kaptDebugKotlin' took 0.0 secs. It is not up-to-date because: Input property 'source' file /Users/username/Android/project-directory/AppName/build/generated/source/dataBinding/debug/android/databinding/layouts/DataBindingInfo.java has changed. Input property 'source' file /Users/username/Android/project-directory/AppName/src/main/java/com/package/to/my/activity/SomeActivity.java has changed.

The DataBindingInfo.java is generated file which contains just a buildId:

package android.databinding.layouts;

import android.databinding.BindingBuildInfo;

@BindingBuildInfo(buildId="23567c57-d3c8-4999-bc79-6211351c7d89")
public class DataBindingInfo {}

And the buildId hash changes each time there is any change in the code.

The project uses Crashlytics, I disabled it for debug builds though.

What might be the cause of this behaviour?

EDIT: buildId is getting regenerated on the project even when the Android Studio is closed and I'm doing the changes in the external editor and running builds from command line.

Answer 1

You can disable Android Gradle's automatic buildId update using the code below for the debug (or other debug variants if you want).

android {
    ...
    buildTypes {
        debug {
            ext.alwaysUpdateBuildId = false
            ...
        }
    }
}