Sunday, 20 January 2013

Android SDK Tutorial – Learn how to install Android SDK

Installing the SDK
This page describes how to install the Android SDK and set up your development environment for the first time.
If you encounter any problems during installation, see the Troubleshooting section at the bottom of this page.
Updating?
If you already have an Android SDK, use the Android SDK and AVD Manager tool to install updated tools and new Android platforms into your existing environment. For information about how to do that, see Adding SDK Components here http://developer.android.com/sdk/adding-components.html
Step 1. Preparing Your Development Computer
Before getting started with the Android SDK, take a moment to confirm that your development computer meets the System Requirements. In particular, you might need to install the JDK, if you don’t have it already.
If you will be developing in Eclipse with the Android Development Tools (ADT) Plugin—the recommended path if you are new to Android—make sure that you have a suitable version of Eclipse installed on your computer (3.4 or newer is recommended). If you need to install Eclipse, you can download it from this location:
http://www.eclipse.org/downloads/
For Eclipse 3.5 or newer, the “Eclipse Classic” version is recommended. Otherwise, a Java or RCP version of Eclipse is recommended.
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 components (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 http://developer.android.com/sdk/index.html
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-.
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 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 developer guide has more information about Developing in Other IDEs.
Step 4. Adding Platforms and Other Components
The last step in setting up your SDK is using the Android SDK and AVD Manager (a tool included in the SDK starter package) to download essential SDK components 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 components. The SDK starter package, which you’ve already downloaded, includes only a single component: the latest version of the SDK Tools. To develop an Android application, you also need to download at least one Android platform and the SDK Platform-tools (tools that the latest platform depend upon). However, downloading additional components is highly recommended.
If you used the Windows installer, when you complete the installation wizard, it will launch the Android SDK and AVD Manager with a default set of platforms and other components selected for you to install. Simply click Install to accept the recommended set of components and install them. You can then skip to Step 5, but we recommend you first read the section about the Available Components to better understand the components available from the Android SDK and AVD Manager.
You can launch the Android SDK and AVD Manager in one of the following ways:
• From within Eclipse, select Window > Android SDK and AVD Manager.
• On Windows, double-click the SDK Manager.ext file at the root of the Android SDK directory.
• On Mac or Linux, open a terminal and navigate to the tools/ directory in the Android SDK, then execute:
To download components, use the graphical UI of the Android SDK and AVD Manager, shown in Figure 1, to browse the SDK repository and select new or updated components. The Android SDK and AVD Manager will install the selected components in your SDK environment. For information about which components you should download, see the following section about Recommended Components.

Figure 1. The Android SDK and AVD Manager’s Available Packages panel, which shows the SDK components that are available for you to download into your environment.
Available Components
By default, there are two repositories of components for your SDK: Android Repository and Third party Add-ons.
The Android Repository offers these types of components:
• SDK Tools (pre-installed in the Android SDK starter package) — Contains tools for debugging and testing your application and other utility tools. You can access these in the /tools/ directory of your SDK and read more about them in the Tools section of the developer guide.
• SDK Platform-tools — Contains tools that are required to develop and debug your application, but which are developed alongside the Android platform in order to support the latest features. These tools are typically updated only when a new platform becomes available. You can access these in the /platform-tools/ directory. Read more about them in the Tools section of the developer guide.
• Android platforms — An SDK platform is available for every production Android platform deployable to Android-powered devices. Each platform component includes a fully compliant Android library and system image, sample code, emulator skins, and any version specific tools. For detailed information about each platform, see the overview documents available under the section “Downloadable SDK Components,” at left.
• USB Driver for Windows (Windows only) — Contains driver files that you can install on your Windows computer, so that you can run and debug your applications on an actual device. You do not need the USB driver unless you plan to debug your application on an actual Android-powered device. If you develop on Mac OS X or Linux, you do not need a special driver to debug your application on an Android-powered device. (See Developing on a Device for more information about developing on a real device.)
• Samples — Contains the sample code and apps available for each Android sdk development platform. If you are just getting started with Android development, make sure to download the samples to your SDK.
• Documentation — Contains a local copy of the latest multiversion documentation for the Android framework API.
The Third party Add-ons provide components that allow you to create a development environment using a specific Android external library (such as the Google Maps library) or a customized (but fully compliant) Android system image. You can add additional Add-on repositories, by clicking Add Add-on Site.
Recommended Components
The SDK repository contains a range of components that you can download. Use the table below to determine which components you need, based on whether you want to set up a basic, recommended, or full development environment:

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Once you’ve installed at least the basic configuration of SDK components, you’re ready to start developing Android apps. The next section describes the contents of the Android SDK to familiarize you with the components you’ve just installed.
For more information about using the Android SDK and AVD Manager, see the Adding SDK Components document here http://developer.android.com/sdk/adding-components.html.
Step 5. Exploring the SDK (Optional)
Once you’ve installed the SDK and downloaded the platforms, documentation, and add-ons that you need, we suggest that you open the SDK directory and take a look at what’s inside.
The table below describes the full SDK directory contents, with components installed.

Optionally, you might want to add the location of the SDK’s tools/ and platform-tools to your PATH environment variable, to provide easy access to the tools.
How to update your PATH
Adding both tools/ and platform-tools/ to your PATH lets you run command line tools without needing to supply the full path to the tool directories. Depending on your operating system, you can include these directories in your PATH in the following way:
• On Windows, right-click on My Computer, and select Properties. Under the Advanced tab, hit the Environment Variables button, and in the dialog that comes up, double-click on Path (under System Variables). Add the full path to the tools/ and platform-tools/ directories to the path.
• On Linux, edit your ~/.bash_profile or ~/.bashrc file. Look for a line that sets the PATH environment variable and add the full path to the tools/ and platform-tools directories to it. If you don’t see a line setting the path, you can add one:
export PATH=${PATH}:/tools:/platform-tools
• On a Mac OS X, look in your home directory for .bash_profile and proceed as for Linux. You can create the .bash_profile if you don’t already have one.
After following the above Android SDK tutorial for successful installation of Android SDK in our PC you are ready to begin developing applications. Now next step will be learning Android development and create your own apps and games.
Troubleshooting
Ubuntu Linux Notes
• If you need help installing and configuring Java on your development machine, you might find these resources helpful:
o https://help.ubuntu.com/community/Java
o https://help.ubuntu.com/community/JavaInstallation
• Here are the steps to install Java and Eclipse, prior to installing the Android SDK and ADT Plugin.
1. If you are running a 64-bit distribution on your development machine, you need to install the ia32-libs package using apt-get::
apt-get install ia32-libs
2. Next, install Java:
apt-get install sun-java6-jdk
3. The Ubuntu package manager does not currently offer an Eclipse 3.3 version for download, so we recommend that you download Eclipse from eclipse.org (http://www.eclipse.org/ downloads/). A Java or RCP version of Eclipse is recommended.
4. Follow the steps given in previous sections to install the SDK and the ADT plugin.
Other Linux Notes
• If JDK is already installed on your development computer, please take a moment to make sure that it meets the version requirements listed in the System Requirements. In particular, note that some Linux distributions may include JDK 1.4 or Gnu Compiler for Java, both of which are not supported for Android development.

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