i have a project to do for android, i want to make a tourist guide app, but i want to have basic information on app and sometime i want 5 request data from google or from website. i must on app apk app or web application in reality i don't know the what is web app.

thank you for reply.
that i have to developp normal app (and) and integrate API
one last question how to bring GUI created in photoshop to use in app devellopment??

Android has a resources folder where you can store various data/objects. One of this folder subfolders is drawable that can be represented also by various screen sizes drawable-hdpi, drawable-mdpi etc

However be warned! Android UI development is not same as web development or iOS "pixel perfect" appraoch.