Lab Session: Play with Features

In this lab, you will add a compass to your application, allow it to pull weather data by your location, and have it choose a random location on shake.

Student Outline

The following lab contains three parts. Start by opening LabFeatures2.nsx.

Compass

Using the resources and code from the Compass sample, add a compass to frmCompass in your app.

Geolocation

1. Attach an onchange event to flpCurrentLocation. When it is switched to On, you should retrieve the current location using [navigator.geolocation.getCurrentPosition] and disable txtCity and btnLoad. When switched to off, txtCity and btnLoad should be re-enabled.
2. When the current location has been retrieved, enable btnLoad.
3. When btnLoad is pressed and flpCurrentLocation is in the On position, load the weather information via latitude and longitude, using the following API: http://api.openweathermap.org/data/2.5/weather?lat=35&lon=139

Accelerometer

1. A shaking motion can be sensed by setting a threshold for change in accelerationIncludingGravity. Experiment to determine what an acceptable threshold is for your device. (an example of this in JavaScript is available here: http://stackoverflow.com/a/4475330)
2. When on frmMain, listen for accelerometer events that could indicate a shaking motion. Set the location to a random latitude and longitude to load weather for that location.