Room – Schema export directory is not provided to the annotation processor so we cannot export the schema

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I am using Android Database Component Room

I’ve configured everything, but when I compile, Android Studio gives me this warning:

Schema export directory is not provided to the annotation processor so
we cannot export the schema. You can either provide
room.schemaLocation annotation processor argument OR set
exportSchema to false.

As I understand it is the location where DB file will be located

How can it affect my app? What is the best practice here? Should I use the default location (false value)?

10 Answers
10

In the build.gradle file for your app module, add this to the defaultConfig section (under the android section). This will write out the schema to a schemas subfolder of your project folder.

javaCompileOptions {
    annotationProcessorOptions {
        arguments += ["room.schemaLocation": "$projectDir/schemas".toString()]
    }
}

Like this:

// ...

android {
    
    // ... (compileSdkVersion, buildToolsVersion, etc)

    defaultConfig {

        // ... (applicationId, miSdkVersion, etc)
        
        javaCompileOptions {
            annotationProcessorOptions {
                arguments += ["room.schemaLocation": "$projectDir/schemas".toString()]
            }
        }
    }
   
    // ... (buildTypes, compileOptions, etc)

}

// ...

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