### 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
  Starts and stops the service class LocalService that runs in the same process as the activity, to demonstrate a service's lifecycle when using {@link android.content.Context#startService Context.startService} and {@link android.content.Context#stopService Context.stopService}.
Local Service Binding
  Demonstrates binding to a service class LocalService that runs in the same process as the activity, to demonstrate using the {@link android.content.Context#bindService Context.bindService} and {@link android.content.Context#unbindService Context.unindService} methods with a service. 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
  Demonstrates starting a service in a separate process, 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 Service 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.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.
  Code:
    ServiceStartArgumentsController.java
    ServiceStartArguments.java
  Layout:
    service_start_arguments_controller.xml
Foreground Service Controller
  Controls the service class ForegroundService, which 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.