java -jar d8.jar \ --lib android.jar \ # Android framework classes --release \ # Optimized release mode --min-api 21 \ # Target Android API level --no-desugaring \ # Skip Java language desugaring --intermediate \ # For incremental compilation input_classes/ \ --output output_dex/ You can embed d8.jar in your toolchain:
– The above is for desugaring libraries. For the actual d8.jar , it is not directly published as a standalone artifact. Instead, Google publishes com.android.tools.build:builder which includes D8. For pure D8, use: d8.jar download
java -version If you get Unsupported major.minor version , upgrade your JRE. When running D8 standalone, you may see errors about missing Android framework classes. Provide android.jar from the Android SDK: java -jar d8
import com.android.tools.r8.D8; import com.android.tools.r8.D8Command; import com.android.tools.r8.OutputMode; import java.nio.file.Paths; public class D8Example { public static void main(String[] args) throws Exception { D8Command command = D8Command.builder() .addProgramFiles(Paths.get("input.jar")) .setOutput(Paths.get("dex_output"), OutputMode.DexIndexed) .setMinApiLevel(21) .build(); D8.run(command); } } For pure D8, use: java -version If you
<dependency> <groupId>com.android.tools.build</groupId> <artifactId>d8</artifactId> <version>8.2.0</version> </dependency> Then manually download the JAR from Maven Central’s web interface. If you trust the official Maven repository, here’s a direct pattern: