What is it all about?
AndEngine relies on ADT to auto-generate a "BuildConfig" class. IntelliJ IDEA (as of 11.1.1) has not fully integrated with ADT-17+. In order to build AndEngine with IntelliJ IDEA, you can simply add the following class yourself in the root package (org.andengine):
•OpenGL ES 2: ◦Support: [> 93% of all Android devices (Apr. 2012) ◦Branch: GLES2-AnchorCenter ◾Active development. ◾The leatest and greatest. ◾More cocos2d -ish (Coordinate-System in the lower left corner, powerful AnchorCenter system.) ◦Branch: GLES2 ◾Not in active development. •OpenGL ES 1: ◦Branch: master ◦Not in active development. ◦Support: > 99.0% of all Android devices (Apr. 2012)