How Can I Declare and Access Variables from Gradle in My Java Code?

Declaring Variables in Gradle for Java Usage

Gradle users often seek to declare variables in their build.gradle files that can be subsequently accessed within Java code. This functionality, akin to pre-processor macros in C/C , allows for dynamic parameterization during the build process.

Method 1: Generating Java Constants

One approach is to generate Java constants using the buildConfigField method:

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"
    }
  }
}

These constants can then be accessed in Java code via BuildConfig.FOO:

Method 2: Generating Android Resources

Another option is to generate Android resources using resValue:

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 code using traditional methods like @string/app_name or R.string.app_name.

By utilizing these techniques, Gradle users can dynamically configure build-time parameters, enhancing the flexibility and reusability of their build scripts.

The above is the detailed content of How Can I Declare and Access Variables from Gradle in My Java Code?. For more information, please follow other related articles on the PHP Chinese website!