Added method to change screenbrightness to ActivityUtils.
Added method to change screenbrightness to ActivityUtils.

chautn/AndEngine,luoxiaoshenghustedu/AndEngine,shiguang1120/AndEngine,yudhir/AndEngine,zhidew/AndEngine,jduberville/AndEngine,zcwk/AndEngine,pongo710/AndEngine,parthipanramesh/AndEngine,zhidew/AndEngine,ericlaro/AndEngineLibrary,duchien85/AndEngine,parthipanramesh/AndEngine,chautn/AndEngine,pongo710/AndEngine,shiguang1120/AndEngine,Munazza/AndEngine,pongo710/AndEngine,yaye729125/gles,Munazza/AndEngine,jduberville/AndEngine,chautn/AndEngine,viacheslavokolitiy/AndEngine,zcwk/AndEngine,jduberville/AndEngine,luoxiaoshenghustedu/AndEngine,msdgwzhy6/AndEngine,nicolasgramlich/AndEngine,ericlaro/AndEngineLibrary,duchien85/AndEngine,borrom/AndEngine,msdgwzhy6/AndEngine,zcwk/AndEngine,zhidew/AndEngine,luoxiaoshenghustedu/AndEngine,zhidew/AndEngine,Munazza/AndEngine,parthipanramesh/AndEngine,viacheslavokolitiy/AndEngine,ericlaro/AndEngineLibrary,godghdai/AndEngine,parthipanramesh/AndEngine,yaye729125/gles,nicolasgramlich/AndEngine,yaye729125/gles,chautn/AndEngine,godghdai/AndEngine,msdgwzhy6/AndEngine,godghdai/AndEngine,borrom/AndEngine,msdgwzhy6/AndEngine,nicolasgramlich/AndEngine,yudhir/AndEngine,yudhir/AndEngine,zcwk/AndEngine,yudhir/AndEngine,shiguang1120/AndEngine,yaye729125/gles,Munazza/AndEngine,godghdai/AndEngine,borrom/AndEngine,pongo710/AndEngine,borrom/AndEngine,luoxiaoshenghustedu/AndEngine,ericlaro/AndEngineLibrary,nicolasgramlich/AndEngine,shiguang1120/AndEngine,jduberville/AndEngine,viacheslavokolitiy/AndEngine,viacheslavokolitiy/AndEngine