Android ApiDemos示例解析(1)：创建ApiDemo示例

Android SDK中带有很多例子，其中ApiDemo详细介绍了Android平台主要API，分成了

• App
• Content
• Graphics
• Media
• OS
• Text
• Views

几个大类，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

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：File ->New Android Project 选择Create project from existing sample (不同Android版本有对应的ApiDemo示例）。