Links

http://www.java2s.com/Open-Source/Android_Free_Code/Development/gallery/pjq_android_gallery.htm
https://f-droid.org/repository/browse

https://fossdroid.com/a/leafpic-2.html
https://github.com/pcqpcq/open-source-android-apps

https://github.com/luckasfb/Development_Documents/tree/master/MTK-Mediatek-Alps-Documents

http://droid-break.info