*API Level:* **3**

Android 1.5 is a major platform release
deployable to Android-powered handsets starting in May 2009.
The release includes new features for users and developers, as well as changes
in the Android framework API.

For developers, the Android 1.5 platform is available as a
downloadable component for the Android SDK. The downloadable platform includes a
fully compliant Android library and system image, as well as a set of emulator
skins, sample applications, and more. The downloadable platform is fully
compliant and includes no external libraries.

To get started developing or testing against the Android
1.5 platform, use the Android SDK and AVD Manager tool to
download the platform into your Android 1.6 or later SDK.

## Platform Highlights

For a list of new user features and platform highlights, see the [Android
1.5 Platform Highlights](https://developer.android.com/about/versions/android-1.5-highlights.html) document.

## API Level

The Android 1.5 platform delivers an updated version of
the framework API. The Android 1.5 API
is assigned an integer identifier ---
**3** --- that is
stored in the system itself. This identifier, called the "API Level", allows the
system to correctly determine whether an application is compatible with
the system, prior to installing the application.

To use APIs introduced in Android 1.5 in your
application, you need to set the proper value, "3", in the
`android:minSdkVersion` attributes of the `<uses-sdk>`
element in your application's manifest.

For more information about how to use API Level, see the [API Levels](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels) document.

## Framework API Changes

The sections below provide information about the application framework API provided by the Android 1.5 platform.

### UI framework

- Framework for easier background/UI thread interaction
- New [SlidingDrawer](https://developer.android.com/reference/android/widget/SlidingDrawer) widget
- New [HorizontalScrollview](https://developer.android.com/reference/android/widget/HorizontalScrollView) widget

### AppWidget framework

- APIs for creating secure home screen [AppWidgets](https://developer.android.com/reference/android/appwidget/package-summary). For information about how to use AppWidgets, see the Developer's Guide [AppWidgets](https://developer.android.com/guide/topics/appwidgets) documentation. Also see [Introducing home screen widgets and the AppWidget
  framework](http://android-developers.blogspot.com/2009/04/introducing-home-screen-widgets-and.html) on the Android Developer's Blog.
- APIs for populating [Live Folders](https://developer.android.com/reference/android/provider/LiveFolders) with custom content.

### Media framework

- Raw audio recording and playback APIs
- Interactive MIDI playback engine
- Video recording APIs for developers (3GP format)
- Video and photo sharing Intents
- Media search Intent

### Input Method framework

- [Input Method
  Service](https://developer.android.com/reference/android/inputmethodservice/InputMethodService) framework
- Text-prediction engine
- Ability to provide downloadable IMEs to users

### Application-defined hardware requirements

Applications can now use a new element in their manifest files, [`<uses-configuration>`](https://developer.android.com/guide/topics/manifest/uses-configuration-element)
to indicate to the Android system what hardware features
they require in order to function properly. For example, an application might
use the element to specify that it requires a physical keyboard or a particular
navigation device, such as a trackball. Prior to installing the application, the
Android system checks the attributes defined for the
`<uses-configuration>` element and allows the installation to
continue only if the required hardware is present.

### Speech recognition framework

- Support for using speech recognition libraries via Intent. See [RecognizerIntent](https://developer.android.com/reference/android/speech/RecognizerIntent).

### Miscellaneous API additions

- LocationManager - Applications can get location change updates via Intent
- WebView - Touch start/end/move/cancel DOM event support
- Redesigned [Sensor Manager
  APIs](https://developer.android.com/reference/android/hardware/SensorManager)
- GLSurfaceView - convenience framework for creating OpenGL applications
- Broadcast Intent for app update install succeeded - for smoother app upgrade experience

### API differences report

For a detailed view of API changes in Android 1.5 (API Level 3), as compared to
the previous version, see the [API
Differences Report](https://developer.android.com/sdk/api_diff/3/changes).

## Built-in Applications

The system image included in the downloadable platform provides these
built-in applications:

|---|---|
| - Alarm Clock - Browser - Calculator - Camcorder - Camera - Contacts - Custom Locale (developer app) - Dev Tools (developer app) | - Dialer - Email - Gallery - IME for Japanese text input - Messaging - Music - Settings - Spare Parts (developer app) |

## Locales

The system image included in the downloadable platform provides a variety of
built-in locales. In some cases, region-specific strings are available for the
locales. In other cases, a default version of the language is used. The
languages that are available in the Android 1.5 system
image are listed below (with *language* _*country/region*
locale descriptor).

|---|---|
| - Chinese, PRC (zh_CN) - Chinese, Taiwan (zh_TW) - Czech (cs_CZ) - Dutch, Netherlands (nl_NL) - Dutch, Belgium (nl_BE) - English, US (en_US) - English, Britain (en_GB) - English, Canada (en_CA) - English, Australia (en_AU) - English, New Zealand (en_NZ) - English, Singapore(en_SG) - French, France (fr_FR) - French, Belgium (fr_BE) | - French, Canada (fr_CA) - French, Switzerland (fr_CH) - German, Germany (de_DE) - German, Austria (de_AT) - German, Switzerland (de_CH) - German, Liechtenstein (de_LI) - Italian, Italy (it_IT) - Italian, Switzerland (it_CH) - Japanese (ja_JP) - Korean (ko_KR) - Polish (pl_PL) - Russian (ru_RU) - Spanish (es_ES) |

Localized UI strings match the locales that are accessible
through Settings.

## Emulator Skins

The downloadable platform includes a set of emulator skins that you can use for modeling your application in different screen sizes and resolutions. The emulator skins are:

- QVGA-P (240x320, low density, small screen)
- QVGA-L (320x480, low density, small screen)
- HVGA (320x480, medium density, normal screen)
- HVGA-P (320x480, medium density, normal screen)
- HVGA-L (320x480, medium density, normal screen)

For more information about how to develop an application that displays and functions properly on all Android-powered devices, see [Supporting Multiple Screens](https://developer.android.com/guide/practices/screens_support).