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Code Style Guidelines for Kiwix-Android

Our code style guidelines is based on the Google Java Style Guide.

Do take some time to read it.

For XML files

Kiwix follows 2dp for the Indent and Continuous Indent values. You can update these values using following steps:

  • Go to Settings -> Editor -> Code Style -> XML
  • Update the respective values under the Tabs and Indents tab

After changing the values, one can simply select the files to indent, Right click -> Reformat Code -> Check Rearrange entries -> OK.

Only a few extra rules

  • Line length is 120 characters
  • FIXME must not be committed in the repository use TODO instead. FIXME can be used in your own local repository only.

You can run a checkstyle with most rules via a gradle command:

$ ./gradlew checkstyle

It generates a HTML report in build/reports/checkstyle/checkstyle.html.

Try to remove as much warnings as possible, It's not completely possible to remove all the warnings, but over a period of time, we should try to make it as complete as possible.

Some DONT's

  • Don't use Hungarian Notation like mContext mCount etc
  • Don't use underscores in variable names
  • All constants should be CAPS. e.g MINIMUM_TIMEOUT_ERROR_EXTERNAL
  • Always use Locale.ENGLISH when using String.format() unless the format itself is locale dependent e.g. String query = String.format(Locale.ENGLISH,...
  • Never concat null with "" (Empty String). It will become "null" e.g. String.equals("" + null, "null") == TRUE