allow the user to set unit of measure.

Samples/WeatherApp/Core.cs

@@ -5,12 +5,12 @@ namespace WeatherApp
 {
     public class Core
     {
-        public static async Task<Weather> GetWeather(string zipCode)
+        public static async Task<Weather> GetWeather(string zipCode, string units = "kelvin")
         {
             //Sign up for a free API key at http://openweathermap.org/appid
             string key = "fc9f6c524fc093759cd28d41fda89a1b";
             string queryString = "http://api.openweathermap.org/data/2.5/weather?zip="
-                + zipCode + "&appid=" + key;
+                + zipCode + "&appid=" + key + "&units=" + units;
 
             var results = await DataService.getDataFromService(queryString).ConfigureAwait(false);
 

Samples/WeatherApp/WeatherPage.xaml

@@ -34,6 +34,8 @@
                 FontSize="Medium" />
             <Label x:Name="zipCodeLabel" Text="Zip Code" Style="{StaticResource labelStyle}" />
             <Entry x:Name="zipCodeEntry" />
+            <Label x:Name="unitOfMeasureLabel" Text="Unit Of Measure" Style="{StaticResource labelStyle}" />
+            <Entry x:Name="unitOfMeasure" Placeholder="kelvin (default), metric, imperial"/>
           </StackLayout>
           <StackLayout Padding="0,0,0,10" VerticalOptions="End">
             <Button x:Name="getWeatherBtn" Text="Get Weather" WidthRequest="185" BorderWidth="1" >

Samples/WeatherApp/WeatherPage.xaml.cs

@@ -19,7 +19,7 @@ namespace WeatherApp
         {
             if (!String.IsNullOrEmpty(zipCodeEntry.Text))
             {
-                Weather weather = await Core.GetWeather(zipCodeEntry.Text);
+                Weather weather = await Core.GetWeather(zipCodeEntry.Text, unitOfMeasure.Text);
                 if (weather != null)
                 {
                     this.BindingContext = weather;