Free download latest Android version: Android 3.1 Platform

For developers of Android, is now available Android 3.1 platform. Android 3.1 platform is available as a downloadable component for the Android SDK. Android 3.1 platform has many features and advantages over previous versions. The downloadable Android platform includes an image library and systems, as well as a set of emulator skins and more. For free download the Android 3.1 Platform click here.

And for free download free the sample code from the website http://developer.android.com :

Accelerometer Play new!

Sample

An example of using the accelerometer to integrate the device's acceleration to a position using the Verlet method. This is illustrated with a very simple particle system comprised of a few iron balls freely moving on an inclined wooden table. The inclination of the virtual table is controlled by the device's accelerometer.

Accessibility Service new!

Sample for Accessibility

Illustrates an accessibility service that provides custom feedback for the Clock application which comes by default with Android devices

API Demos

Sample for Layouts/Views and User Interface

A variety of small applications that demonstrate an extensive collection of framework topics.

Backup and Restore

Sample for Data Access, New Features and Accounts & Sync

Illustrates a few different approaches that an application developer can take when integrating with the Android Backup Manager using the BackupAgent API introduced in Android 2.2.

Bluetooth Chat

Sample for Communication

An application for two-way text messaging over Bluetooth.

BusinessCard

Sample for Accounts & Sync

An application that demonstrates how to launch the built-in contact picker from within an activity. This sample also uses reflection to ensure that the correct version of the contacts API is used, depending on which API level the application is running under.

Contact Manager

Sample for Accounts & Sync

An application that demonstrates how to query the system contacts provider using the ContactsContract API, as well as insert contacts into a specific account.

Cube Live Wallpaper

Sample for User Interface

An application that demonstrates how to create a live wallpaper and bundle it in an application that users can install on their devices.

Home

Sample

A home screen replacement application.

Honeycomb Gallery new!

Sample for New Features and User Interface

An image gallery application using APIs that are new in Android 3.0 (a.k.a. Honeycomb).

JetBoy

Sample for Game Development and Multimedia

A game that demonstrates the SONiVOX JET interactive music technology, with JetPlayer.

Lunar Lander

Sample for Game Development and Multimedia

A classic Lunar Lander game.

Multiple Resolutions

Sample for User Interface, Best Practices and Layouts/Views

A sample application that shows how to use resource directory qualifiers to provide different resources for different screen configurations.

NFC Demo

Sample for Data Access

An application for reading NFC Forum Type 2 Tags using the NFC APIs

Note Pad

Sample for Data Access

An application for saving notes. Similar (but not identical) to the Notepad tutorial.

RenderScript new!

Sample for New Features, Performance, Game Development and OpenGL ES

A set of samples that demonstrate how to use various features of the RenderScript APIs.

SampleSyncAdapter

Sample for Accounts & Sync

Demonstrates how an application can communicate with a cloud-based service and synchronize its data with data stored locally in a content provider. The sample uses two related parts of the Android framework — the account manager and the synchronization manager (through a sync adapter).

Searchable Dictionary v2

Sample for User Interface and Search

A sample application that demonstrates Android's search framework, including how to provide search suggestions for Quick Search Box.

SIP Demo

Sample

A demo application highlighting how to make internet-based calls with the SIP API.

Snake

Sample for Layouts/Views and User Interface

An implementation of the classic game "Snake."

Soft Keyboard

Sample for Input Methods

An example of writing an input method for a software keyboard.

Spinner

Sample for Testing

A simple application that serves as an application under test for the SpinnerTest example.

SpinnerTest

Sample for Testing

The test application for the Activity Testing tutorial. It tests the Spinner example application.

StackView Widget new!

Sample for New Features and App Widgets

Demonstrates how to create a simple collection widget containing a StackView.

TicTacToeLib

Sample for New Features

An example of an Android library project, a type of project that lets you store and manage shared code and resources in one place, then make them available to your other Android applications.