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Presenting Lewis, our own Android Lint extension

Fernando Ramirez wrote this on February 15, 2016 under android, dev, gradle, inaka, language, lint, programming, tool .


The Android Lint tool is a static code analysis tool that checks your Android project source files for potential bugs and optimization improvements for correctness, security, performance, usability, accessibility, and internationalization.

Along different Android projects we have detected some common 'mistakes'. Because of that reason, we have made our Android guidelines. We found out that there were several of those conventions that we could check extending Lint tool. So, Lewis was the result.

In other words, Lewis is an extension of Android Lint, adding our own new rules.

New rules in Lewis

  • Every .java file must be inside a custom package, not inside the root package.
  • Every application must have at least one launcher activity.
  • Every application must have only one launcher activity.
  • A library must not have a launcher activity.
  • A library must not have icons.
  • A library must not use permissions.
  • Every instance variable must be named beginning with 'm' and using camelCase.
  • Every class constant (static and final) must be named using UPPER_SNAKE_CASE.

Inside the Lewis repository you can read more details about those items.

Getting started

These are the steps you have to follow to start using Lewis:

1. Clone the repository

git clone

2. Enter to the project

cd lewis/

3. Build it

./gradlew build

4. Install it

./gradlew install

5. Verify issues

lint --show RootPackage

Note If you can't run lint directly:

source ~/.bash_profile.

6. Run lint

Go to any Android project and run:

./gradlew lint

Or inside Android Studio select Analyze menu, Inspect Code option.

How to disable an issue

Add on your build.gradle file:

android {
    lintOptions {
        disable 'RootPackage','IconInLibrary'



For questions or general comments regarding the use of this tool, please use our public hipchat room.

If you find any bugs, have any problem or ideas of possible new rules that must be added to Lewis, please open an issue (or send a pull request with your solution).

You can check all of our open-source projects at