HOW TO START ANDROID APPS PROJECT/INSTALLATION OF SDK

This post is especially for those who are new to the android field.The first  thing we must know before starting the android project is we must install some of the kit like JDK,SDK and Android ADT plugins.

Here are the steps we should follow for the installation of the required kits:


Step 1. Preparing Your Development Computer

Before getting started with the Android SDK,system requirement must be fulfilled. In particular, you might need to install the JDK, if you don't have it already.

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Step 2. Downloading the SDK Starter Package

The SDK starter package is not a full development environment—it includes only the core SDK Tools, which you can use to download the rest of the SDK packages (such as the latest Android platform).

If you haven't already, get the latest version of the SDK starter package from the SDK download page.

If you downloaded a .zip or .tgz package (instead of the SDK installer), unpack it to a safe location on your machine. By default, the SDK files are unpacked into a directory named android-sdk-<machine-platform>.

If you downloaded the Windows installer (.exe file), run it now and it will check whether the proper Java SE Development Kit (JDK) is installed (installing it, if necessary), then install the SDK Tools into a default location (which you can modify).

Make a note of the name and location of the SDK directory on your system—you will need to refer to the SDK directory later, when setting up the ADT plugin and when using the SDK tools from the command line.


Step 3. Installing the ADT Plugin for Eclipse

Android offers a custom plugin for the Eclipse IDE, called Android Development Tools (ADT), that is designed to give you a powerful, integrated environment in which to build Android applications. It extends the capabilites of Eclipse to let you quickly set up new Android projects, create an application UI, debug your applications using the Android SDK tools, and even export signed (or unsigned) APKs in order to distribute your application. In general, developing in Eclipse with ADT is a highly recommended approach and is the fastest way to get started with Android.

If you'd like to use ADT for developing Android applications, install it now. Read Installing the ADT Plugin for step-by-step installation instructions, then return here to continue the last step in setting up your Android SDK.

If you prefer to work in a different IDE, you do not need to install Eclipse or ADT. Instead, you can directly use the SDK tools to build and debug your application. The Introduction to Android application development outlines the major steps that you need to complete when developing in Eclipse or other IDEs.




Step 4. Adding Platforms and Other Packages

The last step in setting up your SDK is using the Android SDK Manager (a tool included in the SDK starter package) to download essential SDK packages into your development environment.

The SDK uses a modular structure that separates the major parts of the SDK—Android platform versions, add-ons, tools, samples, and documentation—into a set of separately installable packages. The SDK starter package, which you've already downloaded, includes only a single package: the latest version of the SDK Tools. To develop an Android application, you also need to download at least one Android platform and the associated platform tools. You can add other packages and platforms as well, which is highly recommended.

If you used the Windows installer, when you complete the installation wizard, it will launch the Android SDK Manager with a default set of platforms and other packages selected for you to install. Simply click Install to accept the recommended set of packages and install them. You can then skip to Step 5, but we recommend you first read the section about the Available Packages to better understand the packages available from the Android SDK Manager.
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FOR DETAIL INFORMATION PLEASE REFER THE OFFICIAL SITE
http://developer.android.com/sdk/installing.html