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Overview Getting Started Fundamentals LeakCanary at scale Help & Community Shark LeakCanary API Change Log 🤔 Documentation issue? Report or edit LeakCanary 🐤¶ LeakCanary is a memory leak detection library for Android. LeakCanary’s knowledge of the internals of the Android Framework gives it a unique ability to narrow down the cause of each leak, helping developers dramatically reduce jank, Appli
Keywhiz Keywhiz is a system for managing and distributing secrets. It can fit well with a service oriented architecture (SOA). Here is an overview in presentation format Every organization has services or systems that require secrets. Secrets like: TLS certificates/keys GPG keys API tokens database credentials Common practices include putting secrets in config files next to code or copying files t
Background In Square’s new engineer onboarding program, which we call NEO, we offer short courses and lectures on a variety of tools that we use at Square. We started to collect notes from our course on D3.js and found the notes were well-suited for a tutorial — and worth sharing. Introduction The tutorial provides a quick intro to d3.js, a Javascript library for creating data visualizations in th
Cubism.js is a D3 plugin for visualizing time series. Use Cubism to construct better realtime dashboards, pulling data from Graphite, Cube and other sources. Cubism is available under the Apache License on GitHub. Scalable Cubism fetches time series data incrementally: after the initial display, Cubism reduces server load by polling only the most recent values. Cubism renders incrementally, too, u
Tomorrow’s JavaScript module syntax today ES6 Module Transpiler is a JavaScript library for converting JavaScript and CoffeeScript files written using the ES6 draft specification module syntax to existing library-based module systems such as AMD, CommonJS, or simply globals. Demo // Edit me! import { Point, pow, sqrt } from "math"; function Segment(start, end) { this.start = start; this.end = end;
Introduction Retrofit turns your HTTP API into a Java interface. public interface GitHubService { @GET("users/{user}/repos") Call<List<Repo>> listRepos(@Path("user") String user); } The Retrofit class generates an implementation of the GitHubService interface. Retrofit retrofit = new Retrofit.Builder() .baseUrl("https://api.github.com/") .build(); GitHubService service = retrofit.create(GitHubServ
Overview Features Recipes Security Works with OkHttp API Change Logs Contributing OkHttp¶ HTTP is the way modern applications network. It’s how we exchange data & media. Doing HTTP efficiently makes your stuff load faster and saves bandwidth. OkHttp is an HTTP client that’s efficient by default: HTTP/2 support allows all requests to the same host to share a socket. Connection pooling reduces reque
Introduction Images add much-needed context and visual flair to Android applications. Picasso allows for hassle-free image loading in your application—often in one line of code! Picasso.get().load("https://i.imgur.com/DvpvklR.png").into(imageView); Many common pitfalls of image loading on Android are handled automatically by Picasso: Handling ImageView recycling and download cancelation in an adap
As a company built on open source, here are some of the internally-developed libraries we have contributed back to the community.
Introduction Android's ever-expanding ecosystem of devices creates a unique challenge to testing applications. Spoon aims to simplify this task by distributing instrumentation test execution and displaying the results in a meaningful way. Instead of attempting to be a new form of testing, Spoon makes existing instrumentation tests more useful. Using the application APK and instrumentation APK, Spo
Introduction Otto is an event bus designed to decouple different parts of your application while still allowing them to communicate efficiently. Forked from Guava, Otto adds unique functionality to an already refined event bus as well as specializing it to the Android platform. Usage Otto is designed with Android-specific use cases in mind and is intended for use as a singleton (though that is not
Deprecated – Please upgrade to Dagger 2 Square's Dagger 1.x is deprecated in favor of Google's Dagger 2. Please see the migration guide for help with the upgrade. Introduction The best classes in any application are the ones that do stuff: the BarcodeDecoder, the KoopaPhysicsEngine, and the AudioStreamer. These classes have dependencies; perhaps a BarcodeCameraFinder, DefaultPhysicsEngine, and an
Fast Multidimensional Filtering for Coordinated Views Status Crossfilter is not under active development, maintenance or support by Square, its original author Mike Bostock, or the recent contributors (Jason Davies, Tom Carden). We still welcome genuine bug-fixes and PRs but consider the current API and feature-set (~1.3.12) essentially complete. A new Crossfilter Organization has been created on
Time Series Data Collection & Analysis Cube is a system for collecting timestamped events and deriving metrics. By collecting events rather than metrics, Cube lets you compute aggregate statistics post hoc. It also enables richer analysis, such as quantiles and histograms of arbitrary event sets. Cube is built on MongoDB and available under the Apache License on GitHub. Collecting Data An event in
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