CODEWITHSUNDEEP
javaandroidandroid-studiogradle
ammcom
ammcom

Reputation: 1034

Android Studio - java module recompiled on each application recompile

In my Android Studio project, I've added a java module that produces a JAR file which is used by the main module. I understand that Gradle rebuilds all modules on each compile process, but it is clear that it is not needed for java modules if there is no changes since the last build.

So I want to prevent gradle from building my jar file if there is no code changes in the java module, I cannot find such option

Any help is appreciated.

Upvotes: 2

Views: 910

Answers (1)

Budius
Budius

Reputation: 39846

there're two steps to achieve what u want:

  1. Ask the android plugin to pre-dex the libraries.

so you add dexOptions inside the android bracket

android {
    dexOptions {
        preDexLibraries true
    }
}
  1. and the other step is to make your debug build to be minSdkVersion 21, that way the system will build as a multi-dex application so it won't need to merge your dexed library into the APK.

There's a whole section on the dev page about it https://developer.android.com/studio/build/multidex.html#dev-build, but what you want to do is add productFlavors inside the android bracket

android {
 productFlavors {
        // Define separate dev and prod product flavors.
        dev {
            // dev utilizes minSDKVersion = 21 to allow the Android gradle plugin
            // to pre-dex each module and produce an APK that can be tested on
            // Android Lollipop without time consuming dex merging processes.
            minSdkVersion 21
        }
        prod {
            // The actual minSdkVersion for the application.
            minSdkVersion YOUR_APP_MINIMUM_HERE 
        }
    }
}

Upvotes: 2

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