# Contributing code to Matrix
Please read https://github.com/matrix-org/synapse/blob/master/CONTRIBUTING.md
Android support can be found in this [](https://matrix.to/#/#riot-android:matrix.org) room.
Dedicated room for RiotX: [](https://matrix.to/#/#riotx:matrix.org)
# Specific rules for Matrix Android projects
## Android Studio settings
Please set the "hard wrap" setting of Android Studio to 160 chars, this is the setting we use internally to format the source code (Menu `Settings/Editor/Code Style` then `Hard wrap at`).
Please ensure that your using the project formatting rules (which are in the project at .idea/codeStyles/), and format the file before committing them.
## Compilation
For now, the Matrix SDK and the RiotX application are in the same project. So there is no specific thing to do, this project should compile without any special action.
## I want to help translating RiotX
If you want to fix an issue with an English string, please submit a PR.
If you want to fix an issue in other languages, or add a missing translation, or even add a new language, please use [Weblate](https://translate.riot.im/projects/riot-android/).
For the moment, Strings from Riot will be used, there is no dedicated project in Weblate for RiotX.
## I want to submit a PR to fix an issue
Please check if a corresponding issue exists. If yes, please let us know in a comment that you're working on it.
If an issue does not exist yet, it may be relevant to open a new issue and let us know that you're implementing it.
### Kotlin
This project is full Kotlin. Please do not write Java classes.
### CHANGES.md
Please add a line to the top of the file `CHANGES.md` describing your change.
### Code quality
Make sure the following commands execute without any error:
#### Internal tool
./tools/check/check_code_quality.sh
#### ktlint
curl -sSLO https://github.com/pinterest/ktlint/releases/download/0.34.2/ktlint && chmod a+x ktlint
./ktlint --android --experimental -v
Note that you can run
./ktlint --android --experimental -v -F
For ktlint to fix some detected errors for you (you still have to check and commit the fix of course)
#### lint
./gradlew lintGplayRelease
./gradlew lintFdroidRelease
### Unit tests
Make sure the following commands execute without any error:
./gradlew testGplayReleaseUnitTest
### Tests
RiotX is currently supported on Android KitKat (API 19+): please test your change on an Android device (or Android emulator) running with API 19. Many issues can happen (including crashes) on older devices.
Also, if possible, please test your change on a real device. Testing on Android emulator may not be sufficient.
### Internationalisation
When adding new string resources, please only add new entries in file `value/strings.xml`. Translations will be added later by the community of translators with a specific tool named [Weblate](https://translate.riot.im/projects/riot-android/).
Do not hesitate to use plurals when appropriate.
### Accessibility
Please consider accessibility as an important point. As a minimum requirement, in layout XML files please use attributes such as `android:contentDescription` and `android:importantForAccessibility`, and test with a screen reader if it's working well. You can add new string resources, dedicated to accessibility, in this case, please prefix theirs id with `a11y_`.
### Layout
When adding or editing layouts, make sure the layout will render correctly if device uses a RTL (Right To Left) language.
You can check this in the layout editor preview by selecting any RTL language (ex: Arabic).
Also please check that the colors are ok for all the current themes of RiotX. Please use `?attr` instead of `@color` to reference colors in the layout. You can check this in the layout editor preview by selecting all the main themes (`AppTheme.Status`, `AppTheme.Dark`, etc.).
### Authors
Feel free to add an entry in file AUTHORS.md
## Thanks
Thanks for contributing to Matrix projects!