Trinea/android-open-project: a curated index of Android open source libraries

What Trinea/android-open-project actually is

The repository is a list. Its README opens by inviting contributions: "Welcome to recommend good android open source projects, you can Commit directly or tell me at Colloct Page." Nothing in the repository layout suggests a Gradle module, an AAR, or a runtime dependency. The top level holds LICENSE, README.md, README.zh.md, docs/, and two directory trees named in Chinese, one for simplified and one for traditional characters. The README also points to a hosted version at p.codekk.com, described as a more powerful web version of the same content.

The audience is Android developers who already know what they want to build and need candidate names. If you are adding an image loader, a dependency injection container, or an event bus, the categories are the value: the README enumerates Personalized Views (with ListView, ActionBar, Menu, ViewPager, Gallery, ImageView, ProgressBar, TextView and more), Common Util Libs (Dependency Injection, ImageCache, Network, Database ORM, Android common lib, Compatible low version, Multimedia, Event Bus, Sensor, Security, Maps, Plug-in, File), Excellent projects, Development and testing tools, and Outstanding individuals and groups. That taxonomy is the product. It is a map of a large ecosystem, drawn by hand, and it is the reason to open the repository at all.

How the curation works and where the data comes from

There is no scraper, no index job, and no generated catalog in the repository layout. Entries arrive through pull requests and through an issue thread the README links as the Colloct Page, where readers can suggest projects. The README states the contribution path explicitly: commit directly, or report a project in that issue. The actual sections live in the language directories and in docs/, and the hosted site at codekk.com presents the same material in a browsable form.

That design has a direct consequence. The index records that a project exists and which category it belongs to. It does not record the project's last commit, its licence, its minimum SDK, or whether it still compiles against a current Android Gradle Plugin. Those facts live in the linked repository, and the reader is expected to go there. Treat the index as a table of contents, not a database. The README does not document a review process, a freshness policy, or a removal rule for projects that have gone dormant, and the repository layout contains no configuration that would enforce one.

Using it for a first library search

There is nothing to install. The README gives no package, no Gradle coordinate and no binary, so the practical approach is to read the repository on GitHub or open the hosted version at p.codekk.com, which the README presents as the more powerful web version of the same content.

The README's table of contents is the entry point. It links each category to a section, and those sections live in the language directories rather than all in the top-level file. The English material is in README.md, and the README lists its other editions as 简体中文 and 繁體中文, with the corresponding directories at the top level.

LICENSE  README.md  README.zh.md  docs  简体中文版  繁體中文版

A first real task is to pick one category and work through it. If you need an event bus, follow the Common Util Libs section to its Event Bus subsection, then open the linked projects one by one. The README will not tell you which of them is current. That judgement happens on the other side of the links, in each project's own repository.

The freshness problem you inherit from any hand-curated list

A categorized list of Android libraries ages faster than almost any other kind of documentation. Android's own toolchain changes on a yearly cadence, and libraries that were standard in one era get superseded or abandoned. The README's contribution model is human and voluntary, and the repository layout exposes no automated check that a listed project still resolves. The last push to this repository was on 2026-03-25, which tells you the list itself is being touched, but says nothing about the state of the hundreds of projects it links to.

So the failure mode is specific: you find an entry that looks exactly right for your problem, add it, and discover that the linked repository has not been updated in years or targets an SDK level you no longer support. Nothing in this index warns you. The README does not document a staleness marker, a last-verified date, or a deprecation section. If you need a dependency you can resolve and build today, a package index that reports versions and release dates is a better first stop, and this repository is a better second one. The index is strongest when you are still forming a shortlist and weakest at the moment you need a version number.

How it differs from a package registry or an awesome list

The obvious alternative is a package registry such as Maven Central or Google's Maven repository. The difference is the order of operations. A registry answers "what versions of this artifact exist and when were they published" and expects you to already know the artifact name. This repository answers "what artifacts exist for this problem" and expects you to do the version lookup afterwards. Neither replaces the other, and using the registry first only works if you already have the vocabulary.

The second alternative is a general "awesome" list on GitHub. Those tend to be flat, alphabetical, and organized by an individual maintainer's taste, with little structure beyond a bulleted list. Here the organizing principle is a domain taxonomy: views split by widget type, utility libraries split by function, plus separate sections for development and testing tools and for notable individuals and groups. The README also carries a stated contribution standard, linked from the wiki, which a typical awesome list does not have. That structure is the reason to prefer this index for Android work specifically, and the reason a general list is a poor substitute if you are trying to decide between two image loading libraries.

Licence, maintenance and what an upgrade costs you

The repository is Apache-2.0. That covers the index itself: the README text, the category files, and the docs directory. It does not extend to the projects listed inside it. Each linked project carries its own licence, and copying a snippet or a dependency from a listing without checking the target repository's licence is a mistake the Apache-2.0 header here will not protect you from. This is a description of what the licence file covers, not legal advice.

Upgrade cost is close to zero in the conventional sense, because there is no dependency to bump. You pull the repository when you want current content and read it. The real cost is the verification work the index pushes onto you: for every candidate you shortlist, you open the linked repository, check its last commit, read its licence, and confirm it targets an SDK level you support. The README does not document rollback, because there is no installed state to roll back. If you vendor a copy of the list into your own documentation, note that the content changes through pull requests and the hosted version at codekk.com is a separate surface that may not match your copy.

Editorial conclusion

Adopt it as a starting point when you are choosing between Android libraries and want names grouped by category, and skip it if you need a dependency you can resolve today or a maintained compatibility matrix. Before you build anything from a listing, open the linked repository and check its own last commit and licence, because this index does not carry that information for you.

Frequently asked questions

Official sources

1. Issues
2. License: Apache-2.0
3. Project website
4. README
5. Trinea/android-open-project on GitHub