New Launchers & Choosers in WP8

Artigo
03/31/2013

Windows Phone 8 SDK offers a set of predefined tasks that enable applications to access phone functionality (Calendar, Map, SMS, Camera and more) and perform common tasks such as saving appointments, downloading map data for offline usage, sharing a media file on social networks and more. All this is performed via different Launchers and Choosers, each exposing a different API. The difference between a Launcher and a Chooser is that choosers return data, while launchers just start an application from the phone but do not return anything.

NOTE: It is important to consider that when you start a task, a separate application is launched to complete the task and your application is tombstoned.

NOTE: All Tasks that are available in Windows Phone 8 can be found in the Microsoft.Phone.Tasksnamespace. Do not forget to include this namespace when using any of the Task classes.

SaveAppointmentTask – prompts the user to create a new appointment
MapsTask – launches the built-in map app
MapsDirectionsTask – launches the built-in map app with directions
MapDownloaderTask – launches the map down-loader for the built-in map app
ShareMediaTask – prompts the user to share a media file

SaveAppointmentTask

The SaveAppointmentTask launches the built-in calendar application and prompts the user to add a new appointment to their calendar. The task API allows you to populate many of the fields of the new appointment.

 private void btnLaunchAppointmentTask_Click(object sender, RoutedEventArgs e)
 {
 SaveAppointmentTask saveAppointmentTask = new SaveAppointmentTask();
 DateTime currentTime = DateTime.Now;
 saveAppointmentTask.StartTime = currentTime.AddHours(1);
 saveAppointmentTask.EndTime = currentTime.AddHours(3);
 saveAppointmentTask.Subject = "Meet John"; 
 // appointment subject
 saveAppointmentTask.Location = "Office"; 
 // appointment location
 saveAppointmentTask.Details = "Meet John to discuss product launch"; 
 // appointment details
 saveAppointmentTask.IsAllDayEvent = false;
 saveAppointmentTask.Reminder = Reminder.FifteenMinutes;
 saveAppointmentTask.AppointmentStatus = Microsoft.Phone.UserData.AppointmentStatus.Busy;
 saveAppointmentTask.Show();
 }

MapDownloaderTask

The MapDownloaderTask launches the built-in Map application settings and enables the user to download map data for offline use.

 private void btnLaunchMapDownloaderTask_Click(object sender, RoutedEventArgs e)
 {
 MapDownloaderTask mapDownloa-derTask = new 
 MapDownloaderTask();
 mapDownloaderTask.Show();
 }

MapsTask

The MapsTask launches the built-in Map application centered at the user`s current location. You can set a new location, a search term or map zoom level using the Center, SearchTerm and ZoomLevel properties as shown in the code snippet.

 private void btnLaunchMapsTask_Click(object 
 sender, RoutedEventArgs e)
 {
 MapsTask mapsTask = new Maps-Task();
 mapsTask.Center = new GeoCoordinate(51.5171, -0.1362); // London
 // 1 - zoomed out, 20 - zoomedin
 mapsTask.ZoomLevel = 7;
 mapsTask.SearchTerm = "pizza";
 mapsTask.Show();
 }

MapsDirectionsTask

The MapsDirectionsTask launches the built-in Map application with driving directions for getting from a starting location to a destination location. The starting and destination locations can be set as coordinates using the Start and End properties.

 private void btnLaunchMapsDirectionsTask_Click(object sender, RoutedEventArgs e)
 {
 MapsDirectionsTask mapsDirectionsTask = new 
 MapsDirectionsTask();
 mapsDirectionsTask.Start = new 
 LabeledMapLocation("London Victoria", new GeoCoordinate(51.495322, -0.144732));
 mapsDirectionsTask.End = new 
 LabeledMapLocation("London Heathrow", new 
 GeoCoor-dinate(51.471179, -0.454447));
 mapsDirectionsTask.Show();
 }

ShareMediaTask

The ShareMediaTask launches a dialog that enables a user to share a media file. The following code snippet demonstrates how to ask the user to pick a photo and then share it.

 private void btnLaunchShareMediaTask_Click(object sender, RoutedEventArgs e)
 {
 PhotoChooserTask photoChooserTask = new PhotoChooserTask();
 photoChooserTask.ShowCamera = true;
 photoChooserTask.Completed += 
 photoChooserTask_Completed;
 photoChooserTask.Show();
 }
 void photoChooserTask_Completed(object sender, PhotoResult e)
 {
 ShareMediaTask shareMediaTask = new 
 ShareMediaTask();
 shareMediaTask.FilePath = 
 e.OriginalFileName;
 shareMediaTask.Show();
 }

Conclusion

In this post we discussed what the new tasks in Windows Phone 8 are and how to use them. We showed how to prompt the user to add a new appointment, how to display a location or directions on a map and finally, how to share a media file.

Comments

Anonymous
May 07, 2013
Thanks.

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