In this final modification to the Earthquake example, you’ll use Alarms to replace the Timer currently used to schedule Earthquake network refreshes.
Start by creating a new EarthquakeAlarmReceiver c.. Read more
In the following sections, you’ll learn to enhance Notifications to provide additional alerting through hardware, in particular, by making the device ring, flash, and vibrate.
As each enhancement is .. Read more
Notifications are a way for your applications to alert users, without using an Activity. Notifications are handled by the Notification Manger, and currently include the ability to:
❑Create a new stat.. Read more
Moving the Earthquake Service to a Background Thread
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The following example shows how to move the network lookup and XML processing done in the
**.. Read more
Synchronizing Threads for GUI Operations
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Whenever you’re using background threads in a GUI environment, it’s important to synchronize child threads with the m.. Read more
To ensure that your applications remain responsive, it’s good practice to move all slow, time-consuming operations off the main application thread and onto a child thread.
All Android application com.. Read more
Binding Activities to Services
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When an Activity is bound to a Service, it maintains a reference to the Service instance itself, allowing you to make method calls on the.. Read more
An Earthquake Monitoring Service Example
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In this chapter, you’ll modify the Earthquake example you started in Chapter 5 (and continued to enhance in Chapters .. Read more
To start a Service, call **startService**; you can either implicitly specify a Service to start using an action against which the Service is registered, or you can explicitly specify the Service using.. Read more
Unlike Activities, which present a rich graphical interface to users, Services run in the background — updating your Content Providers, firing Intents, and triggering Notifications. They are the perfe.. Read more
Because of the limited screen size of most mobile devices, typically only one application is vis-ible and active on a device at any given time. This offers a perfect environment for applications that .. Read more
Previously in this chapter, you saw how to add the Zoom View to a Map View by pinning it to a specific screen location. You can pin any View-derived object to a Map View (including layouts and other V.. Read more
Introducing MyLocationOverlay
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The MyLocationOverlay class is a special Overlay designed to show your current location and orienta-tion on a MapView.
To use the My Locat.. Read more
Annotating “Where Am I?” This final modification to “Where Am I?” creates and adds a new Overlay that displays a red circle at the device’s current position.
Start by creating a new **MyPositionOverl.. Read more
Canvas drawing for Overlays is handled by overriding the Overlay’s draw handler.
The passed-in Canvas is the surface on which you draw your annotations, using the same techniques introduced in Chapte.. Read more
The Canvas used to draw Overlay annotations is a standard Canvas that represents the visible display surface. To add annotations based on physical locations, you need to convert between geographical p.. Read more
Overlays are a way to add annotations and click handling to MapViews. Each Overlay lets you draw 2D primitives including text, lines, images and shapes directly onto a canvas, which is then overlaid o.. Read more
You use the Map Controller to pan and zoom a MapView. You can get a reference to a MapView’s control-ler using getController, as shown in the following code snippet:
```
MapController mapController =.. Read more
The MapView class is a View that displays the actual map; it includes several options for deciding how the map is displayed.
By default, the Map View will show the standard street map, as shown in Fi.. Read more
The *MapView* provides a compelling User Interface option for presentation of geographical data.
One of the most intuitive ways of providing context for a physical location or address is to display i.. Read more
