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This code overrides the onDestroy method. If this method is invoked for any reason other than finish() was called by the Activity itself, you want to cancel the Activity. This is accomplished with a call to setResult with the inclusion of the Intent extra to pass along the widget identifier. Note that this cancel step is only required when the widget instance is first created. There s no harm in setting the result for future invocations of the Activity. At this point our AppWidget is created, you know how to store data, and you know how to configure a particular instance of the SiteMonitor widget. What s needed next is to update the data. For that, we ll look at the SiteMonitorService.

Our AppWidget instances on the home screen are only useful if they re actually keeping data up-to-date. One means for performing this update is to solely rely on the AppWidgetProvider s onUpdate method. The onUpdate method is invoked periodically according to the schedule specified in the metadata file. One reason for updating the widget outside of the AppWidgetProvider is to provide more granularity than afforded by the built-in scheduling mechanism. For example, you may wish to update the data more frequently than once per hour depending on the conditions. Imagine an AppWidget that tracks stock prices. It makes little sense to have the widget update when the market is closed, and it wouldn t be unreasonable to update once every 15 minutes during market hours.

The final plug-in in this chapter allows you to produce up-to-date currency conversions between 34 major currencies The data used is supplied by the European Central Bank and is based on the prices of each currency relative to the euro at the previous trading session s

Internal hardware set-reset (SR) latch: Able to detect rapidly changing inputs Built-in time variable: Provides access to an elapsed seconds counter

Fortunately, the SiteMonitorWidgetImpl can process ad hoc updates. You re already set up for this because you re overriding the onReceive method. When the onReceive method receives an Intent with an Action equaling SiteMonitorWidgetImpl.UPDATE_WIDGETS, the widgets are updated on the home screen. So, now all you need to do is sort out how (and when) to update the underlying data. Beyond the AppWidget built-in scheduler, there are basically two mechanisms for periodic updates. The first approach is to create a Service that periodically performs an update. The other approach is to set an Alarm that triggers the update on a recurring basis. Let s take a brief look at both strategies.

10:

A constantly running Service is capable of performing this periodic update; it s the ideal place to perform operations that are to be carried out in the background An Android Service is the appropriate vehicle for performing the update work talking to a remote hosted application but what about all the idle time between updates Does the application need to be running, consuming resources but adding no additional value Also, what happens if the Service stops running Do you configure it to be restarted automatically Perhaps it should be kept running at all times, but at what impact on the device s overall performance You need to conserve battery resources as well as keep the load on the CPU as low as feasible to improve overall device responsiveness.

In this chapter, we re going to take a detailed look at some of the M2-class capabilities By the time we re finished, we will have covered the following topics in detail:

FIGURE 10-13

This approach isn t ideal because a long-running Service that s idle the majority of the time consumes resources unnecessarily and brings little overall benefit What about an alarm An alarm can be set to trigger once or periodically Additionally, an alarm may be configured to trigger only when the device is awake if the widget doesn t need to be updated while you and your device are sleeping, there s no need to unnecessarily expend battery resources to perform an update you may never see! Also, the Alarm Manager can group a number of periodic alarms so that the device wakes up for short windows of activity rather than every time an alarm may request it By giving Android some latitude on when an alarm can be fired, you can further manage battery resources for longer life.