五、API DEMO

The API Demos include sample code for many aspects of the Android APIs, from screen layout to Intent resolution.

Activity Hello World

Demonstrates a basic screen activity.

Code:

HelloWorld.java

Layout:

hello_world.xml

Save & Restore State

Demonstrates how an activity should save state when it is paused.

Persistent State

Demonstrates how you can save and restore preferences, which are stored even aft er the user closes the application.

Receive Result

Demonstrates how an activity screen can return a result to the activity that opened it.

Forwarding

Demonstrates opening a new activity and removing the current activity from the history stack, so that when the user later presses BACK they will not see the intermediate

Demonstrates how to make an activity with a transparent background.

TranslucentBlur

Demonstrates how to make an activity with a transparent background with a special android.content.Context#startService Context.startService} and {@link android.content.Context#stopService Context.stopService}.

Local Service Binding

Demonstrates binding to a service class LocalServic e that runs in the same process as the activity, to demonstrate using the {@link android.content. Context#bindS ervice Cont ext.bindService} and {@link android.content.Context#unbindS ervice

Cont ext.unindS ervice} methods with a service. This also shows ho w you can simplify working with a service when you know it will only run in your own process.

Remote Service Controller

Demonstrates starting a service in a separate proc ess, by assigning

android:process=":remote" to the service in the AndroidManifest.xml file.

Remote Service Binding

Demonstrates binding to a remote service, similar to the Local Servic e Binding sample, but illustrating the additional work (defining aidl interfaces) needed to interact with a service in another process. Also shows how a service can publish multiple interfaces and implement callbacks to its clients.

Service Start Arguments Controller

Demonstrates how you can use a Service as a job queue, where you submit jobs to it with {@link android.content.Cont ext#startService Context.startService} instead of binding to the service. Such a service automatically stops itself once all jobs have been processed. This can be a very convenient way to interact with a service when you do not need a result back from it.

Code:

ServiceStartArgumentsController.java ServiceStartArguments.java

Layout:

service_start_arguments_controller.xml

Alarm

Alarm Controller

Demonstrates two ways you can schedule alarms: a one-shot alarm that will happen once at a given time, and a repeating alarm that will happen first at a given time and then continually trigger at regular intervals after that.

Code:

AlarmController.java OneShotAlarm.java RepeatingAlarm.java

Layout:

alarm_controller.xml Alarm Service

such as retrieving recent e-mails.

Code:

AlarmService.java

AlarmService_Service.java

Layout:

alarm_service.xml

Notification NotifyWithText

Demonstrates popup notifications of varying length.

IncomingMessage

Demonstrates sending persistent and transient notifications, with a View object in the notification. It also demonstrated inflating a View object from an XML layout resource.

Search SearchInvoke

Demonstrates various ways in which activities can launch the Search UI.

SearchQueryResults

Demonstrates an activity that receives Search intents and handles them.

SearchSuggestionSampleProvider

Demonstrates how to configure and use the built -in "recent queries" suggestion provider.

Files

 AdvancedPreferenc es.java

 AlarmController.java

 AlarmService.java

 AlarmService_Service.java

 AlertDialogSamples.java

 ContactsFilter.java

 ContactsFilterInstrumentation.java

 ContactsSelectInstrumentation.java

 CustomDialogActivity.java

 CustomTitle.java

 DefaultValues.java

 DialogActivity.java

 ForwardTarget.java

 Forwarding.java

 HelloWorld.java

 IncomingMessage.java

 IncomingMessageView.java

 Intents.java

 LauncherShortcuts.java

 LaunchingPreferences.java

 LocalSample.java

 LocalSampleInstrumentation.java

 LocalService.java

 LocalServiceBinding.java

 LocalServiceController.java

 MenuInflateFromXml.java

 MyPreference.java

 NotificationDisplay.java

 NotifyWithText.java

 NotifyingController.java

 NotifyingService.java

 OneShotAlarm.java

 PersistentState.java

 PreferenceDependencies.java

 PreferencesFromCode.java

 PreferencesFromXml.java

 ReceiveResult.java

 RedirectEnter.java

 RedirectGetter.java

 RedirectMain.java

 RemoteService.java

 RemoteServiceBinding.java

 RemoteServiceController.java

 ReorderFour.java

 ReorderOnLaunch.java

 ReorderThree.java

 ReorderTwo.java

 RepeatingAlarm.java

 SaveRestoreState.java

 SearchInvoke.java

 SearchQueryResults.java

 SearchSuggestionSampleProvider.java

 SendResult.java

 ServiceStartArguments.java

 ServiceStartArgumentsController.java

 StatusBarNotifications.java

 TranslucentActivity.java

 TranslucentBlurActivity.java

 VoiceRecognition.java

Content

Resources Styled Text

Demonstrates loading styled text (bold, italic) defined in a resource file.

Resources

Demonstrates loading styled strings from a resource file, and extracting the raw text.

Files

 ReadAsset.java

 ResourcesSample.java

 StyledText.java

View

RelativeLayout 1. Vertical

Demonstrates a simple relative layout.

2. Simple Form

Demonstrates a more complex relative layout to create a form.

LinearLayout 1. Vertical

Demonstrates a simple LinearLayout, with child width set to WRAP_CONTENT.

2. Vertical (Fill Screen)

Demonstrates a simple LinearLayout, with child width set to FILL_PARENT.

3. Vertical (Padded)

Demonstrates a LinearLayout where one of the elements can expand t o fill any remaining screen space (weight=1).

4. Horizontal

Demonstrates a horizontal LinearLayout, plus an expanding column.

5. Simple Form

Demonstrates nested layouts to create a user form.

6. Uniform Size

LinearLayout which uses a combination of wrap_content on itself and fill_parent on its

7. Fill Parent

Demonstrates a horizontal linear layout with equally sized columns. Some columns force their height to match the parent.

8. Gravity

Demonstrates a simple linear layout with menu options demonstrating horizontal and vertical gravity options.

Demonstrates scrolling screen with buttons altermating with a text view.

2. Long

Demonstrates a longer scrolling screen similar to ScrollView1.

TableLayout 1. Basic

Demonstrates a basic TableLayout with identical children.

2. Empty Cells

Demonstrates a TableLayout with column-spanning rows and different child objects.

3. Long Content

Rows have different number of columns and content does n't fit on screen: column 4 of row 2 shrinks all of the other columns

4. Stretchable

Demonstrates a TableLayout with a stretchable column.

5. Spanning and Stretchable

Demonstrates a complex TableLay out with spanning columns and stretchable columns to create a menu-like layout.

6. More Spanning and Stretchable

Similar to example 5, but with an additional "checked" column.

7. Column Collapse

Similar to example 6, but now wit h buttons on the bottom of the screen that enable you dynamically hide or show columns.

8. Toggle Stretch

9. Toggle Shrink

Demonstrates the use of advanced gravity attributes, such as center_horizontal and right|bottom to align cell contents in a table.

12. Various Widths

Demonstrates the use of elements of various widths in a table.

Baseline

Demonstrates the use of the android:layout_alignBaseline XML attribute in various page layouts.

Demonstrates the default baseline alignment in a complex LinearLayout.

6. Multi-line

Demonstrates a baseline alignment with a multiline field.

7. Relative

Demonstrates baseline alignment in a RelativeLayout.

BaselineNested1

Demonstrates baseline aligning specific elements in three parallel vertical LinearLayout objects.

BaselineNested2

Demonstrates baseline aligning specific elements in three mixed vertical and horizontal LinearLayout objects.

BaselineNested3

Demonstrates baseline alignment within nested LinearLayout objects.

Radio Group Radio Group

Demonstrates using radio buttons and capturing the selected item.

ScrollBars 1. Basic

Demonstrates a scrollable LinearLayout object.

2. Fancy

Demonstrates a scrollable LinearLayout object with a custom thumb slider image.

Visibility Visibility

Demonstrates toggling the visibility of a View object between visible, invisible, and gone.

Lists 1. Array

Demonstrates binding a ListAdapter to a string array as a data source, and displaying the elements on the screen.

Demonstrates implementing a custom ListAdapter that includes separators bet ween some items.

6. ListAdapter Collapsed

Demonstrates another custom list adapter with that returns expandible items.

7. Cursor (Phones)

Demonstrates a list adapter where data comes from a Cursor object.

8. Photos

Demonstrates a list activity that uses a custom ListAdapter, setting the view for an

Custom CustomView

Demonstrates implementing a custom view subclass.

ImageButton ImageButton

Demonstrates an ImageButton: a button with an arbitrary graphic on it.

Date Widgets 1. Dialog

Demonstrates the DatePickerDialog and TimePickerDialog picker dialogs.

2. Inline

Demonstrates using a TimePicker directly in a layout without using a confirmation button or dialog.

Gallery 1. Icons

Demonstrates implementing a Gallery widget and extending GalleryAdapter to create a custom class to serve out source images to the widget.

2. People

Demonstrates populating a Gallery with images from the contacts photos.

Spinner Spinner

Demonstrates populating two Spinner widgets with values.

Grid

1. Icon Grid

Demonstrates populating a GridView widget with a list of applications using a custom ListAdapter object.

2. Photo Grid

Demonstrates populating a GridView widget with images using a custom ListAdapter object.

ImageSwitcher ImageSwitcher

Demonstrates using the ImageSwitcher widget with a custom Adapter.

TextSwitcher TextSwitcher

Demonstrates using the TextSwitcher widget.

Animation 1. Shake

Demonstrates a simple tweened animation (android.view. animation.Animation).

2. Push

Demonstrates a variety of trans formations (android. view.animation.Animation), including fading, motion, and rotation.

Controls

1. Theme White

Demonstrates a variety of common form type widgets, such as check boxes and radio buttons using the white theme.

2. Theme Dark

Demonstrates a variety of common form type widgets, such as check boxes and radio buttons using the dark theme.

Auto Complete 1. Screen Top

Demonstrates the use of A utoCompleteTextView, an autocomplete dropdown box below a text box, with data taken from an array.

2. Screen Bottom

Demonstrates an autocomplete box above a text box.

3. Scroll

Demonstrates an autocomplete text box in the midst of a vertical list.

4. Contacts

Demonstrates an autocomplete text box that gets its content from a database query.

5. Contacts with Hint

Demonstates an autocomplete text box that understands the * wildcard.

Progress Bar 1. Incremental

Demonstrates large and small rotating progress indicat ors that can be incremented or decremented in units.

2. Smooth

Demonstrates large and small continuously rotating progress indicators used to indicate a generic "busy" message.

3. Dialogs

Demonstrates a ProgressDialog, a popup dialog that hosts a progress bar. This example demonstrates both determinate and indeterminate progress indicators.

WindowPolicy's progress indicator feature.

Focus 1. Vertical

Demonstrates how to block selection of a specific screen element.

2. Horizontal

Demonstrates how t o change the order of which screen element is selected when t he user presses arrow keys.

 BaselineNested1.java

 BaselineNested2.java

 BaselineNested3.java

 Buttons1.java

 ChronometerDemo.java

 Controls1.java

 Controls2.java

 CustomView1.java

 DateWidgets1.java

 DateWidgets2.java

 ExpandableList1.java

 ExpandableList2.java

 ExpandableList3.java

 Focus1.java

 Focus2.java

 Focus3.java

 Gallery1.java

 Gallery2.java

 Grid1.java

 Grid2.java

 ImageButton1.java

 ImageSwitcher1.java

 ImageView1.java

 InternalSelectionFocus.java

 InternalSelectionScroll.java

 InternalSelectionView.java

 LabelView.java

 LayoutAnimation1.java

 LayoutAnimation2.java

 LayoutAnimation3.java

 LayoutAnimation4.java

 LayoutAnimation5.java

 LayoutAnimation6.java

 LayoutAnimation7.java

 LinearLayout1.java

 LinearLayout10.java

 LinearLayout2.java

 ProgressBar3.java

 ProgressBar4.java

 RadioGroup1.java

 RatingBar1.java

 RelativeLayout1.java

 RelativeLayout2.java

 ScrollBar1.java ShapeDrawable

Demonstrates creating Drawables in XML.

OpenGL|ES CameraPreview

Demonstrates capturing the image stream from the camera, drawing to a surface (extending SurfaceView) on a separate thread (extending Thread).

GL SurfaceView

Demonstrates how to perform OpenGL rendering in to a SurfaceView.

Code:

GLSurfaceViewActivity.java

Layout:

hello_world.xml

PolyToPoly

Demonstrates calling the {@link

android.graphics.Matrix.html#setPolyToPoly(float[],int,float[],int,int)} method to translate coordinates on a canvas to a new perspective (used to simulate perspective).

DrawPoints

Demonstrates using the {@link android.graphics.Paint} and {@link android.graphics.Canvas} objects to draw random points on the screen, with different colors and strokes.

PathEffects

Demonstrates the use of {@link android.graphics.Path} and various {@link android.graphics.PathEffect} subclasses.

SurfaceView Overlay

Shows how you can place overlays on top of a SurfaceView.

Code:

SurfaceViewOverlay.java, GLSurfaceView.java

Layout:

surface_view_overlay.xml

TouchPaint

 AnimateDrawable.java

 BitmapDecode.java

 BitmapMesh.java

 BitmapPixels.java

 CameraPreview.java

 Clipping.java

 ColorMatrixSample.java

 ColorPickerDialog.java

 Compass.java

 GLSurfaceViewActivity.java

 GradientDrawable1.java

 GraphicsActivity.java

 Layers.java

 ShapeDrawable1.java

 SurfaceViewOverlay.java

 Sweep.java

 TextAlign.java

 TouchPaint.java

 TouchRotateActivity.java

 TranslucentGLSurfaceViewActivity.java

 TriangleActivity.java

 TriangleRenderer.java

 Typefaces.java

 UnicodeChart.java

 Vertices.java

 Xfermodes.java

Text

Files

 Link.java

 LogTextBox.java

 LogTextBox1.java

 Marquee.java

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