一般SDK中都会带有一些示例程序，说明具体用法，Android SDK也是如此。它提供了一些ApiDemo示例，详细说明了Android中主要API，分为以下几大类：

1、App

2、Content

3、Graphics

4、Media

5、OS

6、Text

7、Views

每个大类又分为几个小类，一共大约有200多个实例，涵盖了Android OS API的各个方面。下面是所有示例的列表：

App/Activity/Animation

App/Activity/Custom Dialog

App/Activity/Custom Title

App/Activity/Dialog

App/Activity/Forwarding

App/Activity/Hello World

App/Activity/Persistent State

App/Activity/QuickContactsDemo

App/Activity/Receive Result

App/Activity/Redirection

App/Activity/Reorder Activities

App/Activity/Save & Restore State

App/Activity/SetWallpaper

App/Activity/Translucent

App/Activity/Translucent Blur

App/Activity/Wallpaper

App/Alarm/Alarm Controller

App/Alarm/Alarm Service

App/Device Admin

App/Dialog

App/Intents

App/Launcher Shortcuts

App/Menu/Inflate from XML

App/Notification/IncomingMessage

App/Notification/Notifying Service Controller

App/Notification/NotifyWithText

App/Notification/Status Bar

App/Preferences/1. Preferences from XML

App/Preferences/2. Launching preferences

App/Preferences/3. Preference dependencies

App/Preferences/4. Default values

App/Preferences/5. Preferences from code

App/Preferences/6. Advanced preferences

App/Search/Invoke Search

App/Search/Query Search Results

App/Service/Foreground Service Controller

App/Service/Local Service Binding

App/Service/Local Service Controller

App/Service/Messenger Service

App/Service/Remote Service Binding

App/Service/Remote Service Controller

App/Service/Service Start Arguments Controller

App/Text-To-Speech

App/Voice Recognition

Content/Assets/Read Asset

Content/Resources/Resources

Content/Resources/Styled Text

Content/Storage/External Storage

Graphics/AlphaBitmap

Graphics/AnimateDrawables

Graphics/Arcs

Graphics/BitmapDecode

Graphics/BitmapMesh

Graphics/BitmapPixels

Graphics/CameraPreview

Graphics/Clipping

Graphics/ColorFilters

Graphics/ColorMatrix

Graphics/Compass

Graphics/CreateBitmap

Graphics/Density

Graphics/Drawable/GradientDrawable

Graphics/Drawable/ShapeDrawable

Graphics/FingerPaint

Graphics/Layers

Graphics/MeasureText

Graphics/OpenGL ES/Compressed Texture

Graphics/OpenGL ES/Cube Map

Graphics/OpenGL ES/Frame Buffer Object

Graphics/OpenGL ES/GLSurfaceView

Graphics/OpenGL ES/Kube

Graphics/OpenGL ES/Matrix Palette Skinning

Graphics/OpenGL ES/OpenGL ES 2.0

Graphics/OpenGL ES/Sprite Text

Graphics/OpenGL ES/Textured Triangle

Graphics/OpenGL ES/Touch Rotate

Graphics/OpenGL ES/Translucent GLSurfaceView

Graphics/PathEffects

Graphics/PathFillTypes

Graphics/Patterns

Graphics/Pictures

Graphics/Points

Graphics/PolyToPoly

Graphics/PurgeableBitmap/NonPurgeable

Graphics/PurgeableBitmap/Purgeable

Graphics/Regions

Graphics/RoundRects

Graphics/ScaleToFit

Graphics/SensorTest

Graphics/SurfaceView Overlay

Graphics/Sweep

Graphics/Text Align

Graphics/Touch Paint

Graphics/Typefaces

Graphics/UnicodeChart

Graphics/Vertices

Graphics/Xfermodes

Media/MediaPlayer

Media/VideoView

OS/Morse Code

OS/Sensors

OS/SMS Messaging

Text/Linkify

Text/LogTextBox

Text/Marquee

Views/Animation/3D Transition

Views/Animation/Interpolators

Views/Animation/Push

Views/Animation/Shake

Views/Auto Complete/1. Screen Top

Views/Auto Complete/2. Screen Bottom

Views/Auto Complete/3. Scroll

Views/Auto Complete/4. Contacts

Views/Auto Complete/5. Contacts with Hint

Views/Auto Complete/6. Multiple items

Views/Buttons

Views/Chronometer

Views/Controls/1. Light Theme

Views/Controls/2. Default Theme

Views/Custom

Views/Date Widgets/1. Dialog

Views/Date Widgets/2. Inline

Views/Expandable Lists/1. Custom Adapter

Views/Expandable Lists/2. Cursor (People)

Views/Expandable Lists/3. Simple Adapter

Views/Focus/1. Vertical

Views/Focus/2. Horizontal

Views/Focus/3. Circular

Views/Focus/4. Internal Selection

Views/Gallery/1. Photos

Views/Gallery/2. People

Views/Grid/1. Icon Grid

Views/Grid/2. Photo Grid

Views/ImageButton

Views/ImageSwitcher

Views/ImageView

Views/Layout Animation/1. Grid Fade

Views/Layout Animation/2. List Cascade

Views/Layout Animation/3. Reverse Order

Views/Layout Animation/4. Randomize

Views/Layout Animation/5. Grid Direction

Views/Layout Animation/6. Wave Scale

Views/Layout Animation/7. Nested Animations

Views/Layouts/Baseline/1. Top

Views/Layouts/Baseline/2. Bottom

Views/Layouts/Baseline/3. Center

Views/Layouts/Baseline/4. Everywhere

Views/Layouts/Baseline/5. Multi-line

Views/Layouts/Baseline/6. Relative

Views/Layouts/Baseline/Nested Example 1

Views/Layouts/Baseline/Nested Example 2

Views/Layouts/Baseline/Nested Example 3

Views/Layouts/LinearLayout/1. Vertical

Views/Layouts/LinearLayout/10. Background Image

Views/Layouts/LinearLayout/2. Vertical (Fill Screen)

Views/Layouts/LinearLayout/3. Vertical (Padded)

Views/Layouts/LinearLayout/4. Horizontal

Views/Layouts/LinearLayout/5. Simple Form

Views/Layouts/LinearLayout/6. Uniform Size

Views/Layouts/LinearLayout/7. Fill Parent

Views/Layouts/LinearLayout/8. Gravity

Views/Layouts/LinearLayout/9. Layout Weight

Views/Layouts/RelativeLayout/1. Vertical

Views/Layouts/RelativeLayout/2. Simple Form

Views/Layouts/ScrollView/1. Short

Views/Layouts/ScrollView/2. Long

Views/Layouts/ScrollView/3. Internal Selection

Views/Layouts/TableLayout/01. Basic

Views/Layouts/TableLayout/02. Empty Cells

Views/Layouts/TableLayout/03. Long Content

Views/Layouts/TableLayout/04. Stretchable

Views/Layouts/TableLayout/05. Spanning and Stretchable

Views/Layouts/TableLayout/06. More Spanning and Stretchable

Views/Layouts/TableLayout/07. Column Collapse

Views/Layouts/TableLayout/08. Toggle Stretch

Views/Layouts/TableLayout/09. Toggle Shrink

Views/Layouts/TableLayout/10. Simple Form

Views/Layouts/TableLayout/11. Gravity

Views/Layouts/TableLayout/12. Cell Spanning

Views/Lists/1. Array

Views/Lists/10. Single choice list

Views/Lists/11. Multiple choice list

Views/Lists/12. Transcript

Views/Lists/13. Slow Adapter

Views/Lists/14. Efficient Adapter

Views/Lists/2. Cursor (People)

Views/Lists/3. Cursor (Phones)

Views/Lists/4. ListAdapter

Views/Lists/5. Separators

Views/Lists/6. ListAdapter Collapsed

Views/Lists/7. Cursor (Phones)

Views/Lists/8. Photos

Views/Lists/9. Array (Overlay)

Views/Progress Bar/1. Incremental

Views/Progress Bar/2. Smooth

Views/Progress Bar/3. Dialogs

Views/Progress Bar/4. In Title Bar

Views/Radio Group

Views/Rating Bar

Views/ScrollBars/1. Basic

Views/ScrollBars/2. Fancy

Views/ScrollBars/3. Style

Views/Seek Bar

Views/Spinner

Views/Tabs/Content By Factory

Views/Tabs/Content By Id

Views/Tabs/Content By Intent

Views/TextSwitcher

Views/Visibility

Views/WebView

本示例解读系列将逐个介绍每个示例中涉及到的知识及相关类的用法.

首先是使用Eclipse创建一个ApiDemo示例工程：File ->New Android Project 选择Create project from existing sample (不同Android版本有对应的ApiDemo示例)。

以上就是对Android  ApiDemo 示例工程的创建，希望能帮助到有需要的小伙伴！