Question 1

How do I set up Gradle Retrolambda for an Android project?

Accepted Answer

Add the plugin dependency in your build.gradle, apply the plugin, and set compileOptions to Java 8 in the android block. The README provides clear steps, including Android Studio setup for language level compatibility.

Question 2

Gradle Retrolambda vs native Android Java 8 support: which is better?

Accepted Answer

Native support requires API level 24+ and is more stable, while Retrolambda works on older Android versions but involves bytecode manipulation with potential issues like lint failures. Choose based on your target API and tolerance for build complexity.

Question 3

Why does lint fail with lambdas in my Android project using Retrolambda?

Accepted Answer

Older lint versions aren't compatible with Java 8 sources. Update the Android Gradle plugin to the latest version or use the experimental fork mentioned in the known issues section to resolve this.

Question 4

Can I use Java 8 streams with Retrolambda?

Accepted Answer

No, Retrolambda only handles lambda expressions and method references. For streams, you'd need additional libraries or backports, as the plugin doesn't transform other Java 8 language features.

Question 5

How to fix Google Play Services compatibility issues with Retrolambda?

Accepted Answer

Add '-noverify' to the jvmArgs in the retrolambda configuration block or update to a newer version of Google Play Services, as specified in the known issues to avoid bytecode verification errors.

Question 6

Does Gradle Retrolambda work with Kotlin or mixed Java-Kotlin projects?

Accepted Answer

The README doesn't mention Kotlin; it's designed for Java projects. For Kotlin, use Kotlin's own lambda support, which targets compatible JVM versions, and Retrolambda may not handle Kotlin bytecode correctly.

Gradle Retrolambda Plugin

What is Gradle Retrolambda Plugin?

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