Android Libraries
Image crop & compression
Luban
Luban is an image compressing tool for android with efficacy very close to that of WeChat Moments
https://github.com/Curzibn/Luban
PictureSelector
A picture selector for android platform, support for selecting pictures or videos, audio from photo albums or photos, support for dynamic permission acquisition, cropping (single image or multi-image cropping), compression, theme custom configuration, etc. Open source image selection framework for 6.0+ systems.
https://github.com/LuckSiege/PictureSelector
Networking and API
Swagger Gradle Codegen
A Gradle Plugin to generate your networking code from Swagger
https://github.com/Yelp/swagger-gradle-codegen
Android Cookie Store
Android InMemory and persistent Cookie Store for HttpURLConnection and OkHttp, with extensions to easily sync cookies in Android WebViews.