How to Pass Gradle Variables to Java Code?

Passing Variables from Gradle to Java

In Gradle, you can declare variables that can be accessed within Java code during the build process. Here are two methods you can use:

Generating Java Constants

Configure the buildConfigField property in the buildTypes block:

android {
    buildTypes {
        debug {
            buildConfigField "int", "FOO", "42"
            buildConfigField "String", "FOO_STRING", "\"foo\""
            buildConfigField "boolean", "LOG", "true"
        }

        release {
            buildConfigField "int", "FOO", "52"
            buildConfigField "String", "FOO_STRING", "\"bar\""
            buildConfigField "boolean", "LOG", "false"
        }
    }
}

You can then access these constants in Java using BuildConfig.FOO.

Generating Android Resources

Use the resValue property within the buildTypes block:

android {
    buildTypes {
        debug {
            resValue "string", "app_name", "My App Name Debug"
        }
        release {
            resValue "string", "app_name", "My App Name"
        }
    }
}

These resources can be accessed in Java via @string/app_name or R.string.app_name.

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