# Four Smart Ways to Use Open Source in Android Apps

Four practical ways to harness open source in Android app development, from leveraging libraries to contributing to Android and Flutter and publishing your own.

Android is itself a product of open source. The OS sits on the Linux kernel, the SDK ships under Apache 2.0, and the Android Open Source Project (AOSP) is one of the largest collaborative codebases anywhere. So it's a little odd how many teams treat open source as something you grab from occasionally, rather than an ecosystem you actively work inside. We've been shipping [Android apps](/android-app-development) for over a decade and a half at GTS Infosoft, and the projects that went smoothest were almost always the ones where we used open source deliberately — with a plan, not a shrug.

Here are four ways to do that, drawn from what's actually worked on our own client builds.

## 1. Use Proven Libraries Instead of Rewriting Solved Problems

This one sounds obvious. In practice, it isn't. We still review codebases where someone hand-rolled an HTTP layer or an image cache well after good options existed, and the maintenance bill is always ugly. Networking, image loading, JSON parsing, local persistence, dependency injection — these are solved problems. Retrofit and OkHttp handle networking. Coil (or Glide on older codebases) handles images. Room wraps SQLite. Moshi or kotlinx.serialization parse JSON. Hilt wires it all together.

Each of those libraries represents thousands of engineering hours you don't have to spend, plus years of bug reports from millions of production devices you'll never own. Your hand-rolled version will never see that kind of testing. Ever.

### How we vet a library before it touches client code

GitHub stars are a popularity contest, not a quality signal. Before we add a dependency, we check four things: when the last release shipped, the ratio of open issues to closed ones, whether the maintainer responds to security reports, and what the library drags in transitively. A 40 KB utility that pulls in 4 MB of transitive dependencies isn't a 40 KB utility.

### Read the licence. Actually read it

Open source doesn't mean free to do whatever you like. Apache 2.0 and MIT are permissive and safe for commercial apps — keep the attribution notices and you're fine. GPL is a different animal: linking GPL code into your app can obligate you to release your own source. For client work that's usually a dealbreaker, so we run a licence scan on every build. One rogue dependency can create a legal headache someone's lawyer finds two years later.

## 2. Contribute Back to AOSP

Filing a good bug against Android is contribution. So is a documentation fix. You don't need to land a kernel patch to be useful. The AOSP issue tracker is public, the contribution guidelines live on source.android.com, and small, well-described reports genuinely get triaged.

Why bother? Selfishly: reading platform source is the fastest way we know to understand why the framework behaves the way it does. Half the weird bugs we've debugged over 16 years stopped being weird once we read the actual implementation of the class involved. Less selfishly: a healthy platform is the foundation your career sits on. That's worth an afternoon a month.

## 3. Get Involved With Flutter and the Cross-Platform Community

Flutter is Google's open source UI toolkit, and it remains one of the most active repositories on GitHub. If native Android feels saturated, the [Flutter](/flutter-app-development) world still has open frontier: plugin packages that need maintainers, issues that need reproduction cases, docs that need better examples. The core team engages with outside contributors far more directly than most projects this size manage to.

We do plenty of [cross-platform work](/hybrid-app-development) alongside our native builds, and our Android developers who spend time in the Flutter issue tracker come back better at native, too. Seeing how another rendering model solves layout and state makes you question habits you didn't know you had.

## 4. Publish a Library of Your Own

Sooner or later you'll build something with no good existing library — a wrapper around a fussy payments SDK, a custom chart view, a validation engine. When that happens, pull it into its own Gradle module from day one. Modularising forces clean boundaries, which improves the host app even if you never publish a thing.

And if you do publish? Put it on GitHub, add a licence file, write a README with one copy-pasteable example, and follow semantic versioning so users can upgrade without fear. That's the whole checklist. You don't need Maven Central on day one; JitPack works fine while you find out whether anyone cares. A library with even fifty users teaches you more about API design than any course will, because real users break your assumptions in ways you can't invent on your own.

## The Compounding Effect

Teams that do all four of these things ship faster, debug faster, and hire more easily, because their developers are visible in the community. A three-person team with good open source discipline routinely outbuilds a ten-person team without it. We've watched it happen on [our own projects](/case-studies) more than once.

## Frequently Asked Questions

### Is it safe to use open source libraries in a commercial Android app?

Yes, provided you check the licence and vet the project's health. Permissive licences like Apache 2.0 and MIT are commercial-friendly as long as you keep the attribution notices. Avoid unmaintained libraries for anything security-sensitive, and run a licence scan on your dependency tree before every release.

### Will using open source libraries force me to open source my own app?

Usually no. Apache 2.0, MIT and BSD licences carry no such requirement. GPL-licensed code is the exception — linking it into your app can trigger an obligation to release your source, which is why most commercial Android teams simply keep GPL dependencies out of the build entirely.

### How many third-party libraries should an Android app use?

As few as genuinely earn their place. Every dependency adds APK size, build time and a maintenance liability for the day it's abandoned. Healthy production apps we audit typically have 15 to 30 direct dependencies; if yours has 80, a cleanup pass will almost certainly find dead weight.

Open source can take an Android project a long way. Experienced hands take it the rest. GTS Infosoft has spent 16 years building for the platform — 250+ apps shipped, ISO 9001:2015 certified, with clients across India, the USA and Australia. If you've got an Android build on the horizon, [talk to GTS Infosoft](/contact) and we'll show you exactly how we'd approach it.
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Source: https://gtsinfosoft.com/blogs/four-ingenious-ways-of-utilizing-open-source-into-android-application-development · GTS Infosoft LLP