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If the report shows severe weather in the forecast, we update the time of the last alert field and call a helper method to initiate sending a Notification C After we process the user s saved locations, we get the device s alert location from the database using a postal code designation If the user has requested alerts for his current location, we repeat the process of polling and sending an alert for the device s current location as well You can see more details on Android location-related facilities in chapter 11 After defining our TimerTask, we create a Handler member variable This variable will receive a Message object that s fired from a non-UI thread In this case, after receiving the Message, our Handler calls a helper method that instantiates and displays a Notification D Next, we override the Service lifecycle methods, starting with onCreate.

Here comes the meat of our Service: a Timer E that we configure to repeatedly fire For as long as the Service continues to run, the timer will allow us to update weather information After onCreate, we see onDestroy, where we clean up our database connection F Service classes provide these lifecycle methods so you can control how resources are allocated and deallocated, similar to Activity classes After the lifecycle-related methods, we implement the required onBind method This method returns an IBinder, which other components that call into Service methods will use for communication The WeatherAlertService performs only a background task; it doesn t support binding, and so it returns a null for onBind We ll add binding and interprocess communication (IPC) in section 45 Next, we implement our helper methods First, loadRecord calls out to the Yahoo! Weather API via YWeatherFetcher.

Both Yahoo! and Google provide excellent search results, and Microsoft s Bing search isn t bad either But because the quality of Yahoo! s results is, in my opinion, equal to Google s, I thought I would root for the underdog and provide a plug-in for Yahoo! s search API, particularly considering that their API allows unlimited uses per day (although they reserve the right to limit this and/or charge in the future), plus you are permitted to reorder and blend the results with other content Obviously, with the merger of certain Bing and Yahoo! search assets, the results at Yahoo! seem likely to improve even further, since Microsoft is very keen to catch up on Google s search engine lead It also means this plug-in may require updating if the API is changed So, for the latest details please see http://developeryahoocom/search/boss Anyway, using this plug-in you can provide three arguments to have up to 50 results returned at a time, and can page through the remaining results as deeply as you like Figure 10-9 shows it being used to find web sites relating to the query yahoo search api

Figure 8-4

(We ll cover networking tasks, similar to those this class performs, in chapter 6) Then sendNotification configures a Message with location details to activate the Handler we declared earlier Last of all, you see the notifyFromHandler method This method fires off a Notification with Intent objects that will call back into the WeatherReporter Activity if the user clicks on the Notification G Now that we ve discussed the purpose of services and you ve created a Service class and started one via a BroadcastReceiver, we can start looking at how other developers can interact with your Service..

This plug-in takes a search term and returns results from the Yahoo! search engine Upon success, it returns a two-element array with the first value being the number of results returned, and the second an array of result details, containing a sub-array in each element, with the following values: The title The abstract The URL to be displayed The URL for clicking through to

Our sample application starts a Service and leaves it running in the background. Our service is designed to have a minimal footprint, but Android best practices discourage long-running services. Services that run continually and constantly use the network or perform CPU-intensive tasks will eat up the device s battery life and might slow down other operations. Even worse, because they run in the background, the user won t know what applications are to blame for her device s poor performance. The OS will eventually kill running services if it needs to acquire additional memory, but otherwise won t interfere with poorly designed services. If your use case no longer requires the service, you should stop it. If you do require a long-running service, you might want to give the user the option of whether to use it.

8

FIGURE 10-9