Beginner’s Guide on Building Your First Android App

If you’ve ever thought about building a mobile application but put these dreams aside for whatever reason, now’s the time to get started. And with over a million new device activations per day, the mobile platform that will give you the most potential reach is clearly the Android OS.
So how do you go about building your first Android application? Well, that’s where XDA Senior Member Nachiket.Namjoshi is hoping to chime in with his tutorial thread. The guide is aimed at individuals just getting started with Android app development, but who have some experience with object oriented programming, Java, and Eclipse.
Nachiket.Namjoshi’s guide walks you through initial setup of an Eclipse-based development environment on Windows, as well as the Android SDK, Android Developer Tools (ADT), and the JDK. Once you have the prerequisites installed, the guide defines some of the fundamental staples of Android apps, including activities, services, content providers, broadcast receivers, as well as how to declare permissions and a minimum API level in the AndroidManifest.xml file. After the explanations, the guide shows you how to create activities and intents, as well as how to call them.
Budding application developers, be sure to head over to the tutorial thread to get started.

Source : xda-developers