Android development: Getting data from WordPress
There is Wordpress plug-in called JSON-API it gives you ability to access every object of Wordpress( post ,page ,category.. etc ) in the form of JSON. you can use any rest client like volley from google, retrofit from Square or build your won to access wordpress data.
install Wordpress plug-in http://wordpress.org/plugins/json-api/
for sample code you can look Wordpress for android source code on githubhttps://github.com/wordpress-mobile/WordPress-Android