PrivacyStreams is an Android library for easy and privacy-friendly personal data access and processing. It offers a functional programming model for various types of personal data, including locations, photos, audios, sensors, contacts, messages, and more.
Just as there was Retroweaver et al. for running Java 5 code with generics on Java 1.4, Retrolambda lets you run Java 8 code with lambda expressions on Java 7 or lower. It does this by transforming your Java 8 compiled bytecode so that it can run on a Java 7 runtime. After the transformation they are just a bunch of normal .class files, without adding any runtime dependencies.