How Can I Access Gradle Variables in My Java Code?

Declaring and Using Gradle Variables in Java

Gradle, a versatile build system for Android and other projects, offers the ability to declare variables within its build scripts (.gradle files) and subsequently access them in Java code. This functionality allows developers to define configurable settings and constants during the build process that can be utilized by the generated code.

One approach to achieving this is by utilizing Gradle's buildConfigField feature. This feature enables the generation of Java constants that can be accessed at runtime via the BuildConfig class.

Example

android {
    buildTypes {
        debug {
            buildConfigField "int", "FOO", "42"
            buildConfigField "String", "FOO_STRING", "\"foo\""
        }
        release {
            buildConfigField "int", "FOO", "52"
            buildConfigField "String", "FOO_STRING", "\"bar\""
        }
    }
}

In the Java code, the values can be accessed as:

int fooValue = BuildConfig.FOO;
String fooStringValue = BuildConfig.FOO_STRING;

Another method involves the use of Android resources. By defining string resources with distinct values for different build types, developers can dynamically access these values at runtime.

Example

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

In Java, the app name can be retrieved using:

String appName = getString(R.string.app_name);

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