public void OnItemSelected(int position)
{
Fragment current = FragmentManager.FindFragmentById(Resource.Id.fragment_container);
Type targetFragmentType = null;
WeatherListType weatherListType = 0;
switch (mNavDrawerAdapter?.GetStringId(position))
{
case Resource.String.label_condition:
default:
targetFragmentType = typeof(WeatherNowFragment);
break;
case Resource.String.title_fragment_alerts:
targetFragmentType = typeof(WeatherListFragment);
weatherListType = WeatherListType.Alerts;
break;
case Resource.String.label_forecast:
targetFragmentType = typeof(WeatherListFragment);
weatherListType = WeatherListType.Forecast;
break;
case Resource.String.label_hourlyforecast:
targetFragmentType = typeof(WeatherListFragment);
weatherListType = WeatherListType.HourlyForecast;
break;
case Resource.String.label_details:
targetFragmentType = typeof(WeatherDetailsFragment);
break;
}
if (typeof(WeatherNowFragment).Equals(targetFragmentType))
{
if (!Class.FromType(typeof(WeatherNowFragment)).Equals(current.Class))
{
// Pop all since we're going home
FragmentManager.PopBackStackImmediate(null, PopBackStackFlags.Inclusive);
}
}
else if (typeof(WeatherListFragment).Equals(targetFragmentType))
{
if (!Class.FromType(targetFragmentType).Equals(current.Class))
{
// Add fragment to backstack
var ft = FragmentManager.BeginTransaction();
ft.Add(Resource.Id.fragment_container,
WeatherListFragment.NewInstance(weatherListType, mNavDrawerAdapter.WeatherNowView),
null)
.AddToBackStack(null);
if (FragmentManager.BackStackEntryCount > 0)
{
ft.Remove(current);
}
ft.Commit();
}
else if (current is WeatherListFragment forecastFragment)
{
if (forecastFragment.Arguments != null &&
((WeatherListType)forecastFragment.Arguments.GetInt("WeatherListType", 0)) != weatherListType)
{
Bundle args = new Bundle();
args.PutInt("WeatherListType", (int)weatherListType);
forecastFragment.Arguments = args;
forecastFragment.Initialize();
}
}
}
else if (typeof(WeatherDetailsFragment).Equals(targetFragmentType))
{
if (!Class.FromType(typeof(WeatherDetailsFragment)).Equals(current.Class))
{
// Add fragment to backstack
var ft = FragmentManager.BeginTransaction();
ft.Add(Resource.Id.fragment_container, WeatherDetailsFragment.NewInstance(mNavDrawerAdapter.WeatherNowView), null)
.AddToBackStack(null);
if (FragmentManager.BackStackEntryCount > 0)
{
ft.Remove(current);
}
ft.Commit();
}
}
}