一般SDK中都會(huì)帶有一些示例程序，說明具體用法，Android SDK也是如此。它提供了一些ApiDemo示例，詳細(xì)說明了Android中主要API，分為以下幾大類：

1、App

2、Content

3、Graphics

4、Media

5、OS

6、Text

7、Views

每個(gè)大類又分為幾個(gè)小類，一共大約有200多個(gè)實(shí)例，涵蓋了Android OS API的各個(gè)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

本示例解讀系列將逐個(gè)介紹每個(gè)示例中涉及到的知識(shí)及相關(guān)類的用法.

首先是使用Eclipse創(chuàng)建一個(gè)ApiDemo示例工程：File ->New Android Project 選擇Create project from existing sample （不同Android版本有對(duì)應(yīng)的ApiDemo示例）。