Oh, I remember the sleepless nights when trying to make 3rd party static libraries work… To make it work all of my projects have Application.mk with such settings:
APP_STL := gnustl_static
APP_ABI := armeabi-v7a
APP_CXXFLAGS := -std=c++11
(I’m using mostly 4.14 now, for newer version you can change std to c++14, I think)