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 after 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 activity.

Redirection

Demonstrates how to save data to preferences and use it to determine which activity to open next.

Translucent

Demonstrates how to make an activity with a transparent background.

TranslucentBlur

Demonstrates how to make an activity with a transparent background with a special effect (blur).

Service

Local Service Controller and Local Service Binding

Demonstrate the implementation of a service that runs in the same process as its client(s). Shows how those clients can either start/stop it with {@link android.content.Context#startService Context.startService} and {@link android.content.Context#stopService Context.stopService}, or bind and call it with {@link android.content.Context#bindService Context.bindService} and {@link android.content.Context#unbindService Context.unindService}. This also shows how you can simplify working with a service when you know it will only run in your own process.

Remote Service Controller and Remove Service Binding

Demonstrates starting a service in a separate process, by assigning android:process=":remote" to the service in the AndroidManifest.xml file. Shows how those clients can either start/stop it with {@link android.content.Context#startService Context.startService} and {@link android.content.Context#stopService Context.stopService}, or bind and call it with {@link android.content.Context#bindService Context.bindService} and {@link android.content.Context#unbindService Context.unindService}. Binding is similar to the local service sample, but illustrates 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.Context#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.

Foreground Service Controller

Shows how you can write a Service that runs in the foreground and works on both pre-2.0 and post-2.0 versions of the platform. This example will selectively use the new foreground APIs that were introduced in Android 2.0 if they are available.

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

Demonstrates how you can schedule an alarm that causes a service to be started. This is useful when you want to schedule alarms that initiate long-running operations, 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.