The Android app follows the style defined in android/code_style_scheme.xml. Code not respecting this style will not be accepted and you will be asked by reviewers to edit your PR.
You can import this configuration file in Android Studio to allow automatically formatting Java files. When Android Studio is open, go to File -> Settings then open the section Editor -> Code Style -> Java. Here click on the gear icon next to the dropdown at the top of the page and select Import Scheme.... Select android/code_style_scheme.xml and press OK in the next dialog.
Before making a commit, please reformat your files using Code -> Reformat File. In the opening dialog, select the scope Only VCS changed text and tick all the optional checkbox (optimize imports, rearrange code and code cleanup).