Unable to find native library cocos2dcpp

I follow the readme document to build helloworld alpha1 project .


But run on real device Xiaomi2S,eclipse log show unable to find native library cocos2dcpp.
I sure i have imported libcocos2dx into eclipse,
Please tell me how can I solve this problem?
Thank you!

You should build the project first in command line mode by using ‘build_native.py’. Then import the project to eclipse.