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We'll get to the shrinking, but first let's motivate the binary in question. Three years ago I wrote the "Surfacing Hidden Change to Pull Requests" post which covered pushing important stats and diffs into PRs as a comment. This avoids surprises with changes that affect binary size, manifests, and dependency trees. Showing dependency trees used Gradle's dependencies task and diff -U 0 to display c

When writing multiplatform code, Kotlin's three compiler backends each have different memory models which must be considered. JavaScript is single-threaded so you really can do no wrong. The JVM model is arguably too permissive where you can do incorrect things and have them work 99.9% of the time. When targeting native, Kotlin enforces some invariants which helps prevent you from those 0.1% bugs

I want to remove Google as a single point of failure in my life. They have two decades of my email. They have two decades of my photos. They have the only copy of thousands of documents, projects, and other random files from the last two decades. Now I trust Google completely in their ability to correctly retain my data. But I think it's clear that over the last 5 years the company has lost someth

Note: This post is part of a series on D8 and R8, Android's new dexer and optimizer, respectively. For an intro to D8 read "Android's Java 8 support". For an intro to R8 read "R8 Optimization: Staticization". The previous post on R8 covered method outlining which automatically de-duplicated code. This was actually a detour from what I had promised was next at the end of the class constant operatio

Note: This post is part of a series on D8 and R8, Android's new dexer and optimizer, respectively. For an intro to D8 read "Android's Java 8 support". For an intro to R8 read "R8 Optimization: Staticization". The previous post (part 1, part 2) featured R8 performing data-flow analysis of variables in order to determine if they were maybe null, always null, or never null, and then potentially perfo

Kotlin 1.3's experimental inline class feature allows creating type-safe, semantic wrappers around values which are erased at runtime. Database IDs are a perfect use case for this functionality. Combined with SQLDelight which automatically generates model objects and APIs for querying, different table's IDs become different types which prevent erroneous use. In modeling an app that sends payments,

Note: This post is part of a series on D8 and R8, Android's new dexer and optimizer, respectively. For an intro to D8 read "Android's Java 8 support". This post introduces R8. The first three posts (1, 2, 3) in this series explored D8. Among its core responsibility of converting Java bytecode to Dalvik bytecode, it desugars new Java language features and works around vendor- and version-specific b

Note: This post is part of a series on D8 and R8, Android's new dexer and optimizer, respectively. For an intro to D8 read "Android's Java 8 support". The first post in this series explored Android's Java 8 support. Having support for the language features and APIs of Java 8 is table stakes at this point. We're not quite there with the APIs yet, sadly, but D8 has us covered with the language featu

I've worked from home for a few years, and during that time I've heard people around the office complaining about Android's varying support for different versions of Java. Every year at Google I/O you could find me asking about it at the fireside chats or directly to the folks responsible. At conferences and other developer events it comes up in conversation or in talks with different degrees of a

Every day new Java code is written for Android apps and libraries which is plagued with an infectious disease: Hungarian notation. The proliferation of Hungarian notation on Android is an accident and its continued justification erroneous. Let’s dispel its common means of advocacy: “The Android Java style guide recommends its use” There is no such thing as an Android Java style guide that provides

Major version updates to libraries solve the API warts of old and bring shiny new APIs to address previous shortcomings—often in a breaking fashion. Updating an Android or Java app is usually a day or two affair before you reap the benefits. Problems arise, however, when other libraries you depend on have transitive dependencies on older versions of the updated library. Retrofit 2.0 is nearing rel

Speaking at conferences is an investment of speakers in time, energy, and knowledge. The quality of a presentation and of the conference itself can be measured in the amount of investment made. Here are my tips for future conference speakers. Choosing A Conference At which conference you choose to speak is arguably as important as the topic selection and the amount of work put into the presentatio

Guava is a monolithic library, but that's not necessarily a bad thing. Nobody thinks twice when bundling it for the JVM. In the world of Android the mention of Guava has a bit of a negative stigma due to the dex file format's method limit and a concern about bloating APK size. The latter is no longer a valid argument. The dex method limit is a hard 64k limit to which Guava contributes just over 14

Two years ago I wrote a blog post complaining that the Android build system was broken. At the time, Eclipse ADT and Ant were the blessed solutions and they just hadn't scaled with the platform. Third-party solutions existed for both tooling and IDE but they always felt a bit illegitimate and at risk for problems. My post joined the cries of others who knew that something had to be done. Xavier Du