[mono-android] java translation, mark murphy 05 fancy viewlist example

[Jonathan Pryor]

There were two bugs with your translation.

On Mar 16, 2011, at 1:41 AM, Michael Isbell wrote:
> FILE 1
...
> 	public class LunchList : Activity
> 	{
> 		IList<Restaurant> model=new List<Restaurant>();

Change 1: make this a JavaList<Restaurant>, not a List<Restaurant>. Currently, IList<T> marshaling is "[In]" (to use a P/Invoke equivalent). That is, the contents of the list are copied into a Java-side java.util.ArrayList, and that copy is passed to Java code.

This is a problem because later, in LunchList.onSave(), you call adapter.Add(restaurant), which alters the java-side list but NOT the managed-side list.

By using JavaList<T> instead, you have a single list, so when the list is changed by Java code the changes are visible within managed code.

> FILE 2
...
> public class RestaurantAdapter : ArrayAdapter<Restaurant>
...
> 		public View getView(int position, View convertView,
> 												ViewGroup parent) {

Change 2: this is wrong. The Java code doesn't make it obvious, but this is supposed to override a base class method. (Specifically, the sample code _should_ have used @Override to make this clearer, but @Override is optional, so Java missing @Override doesn't break anything. Not overriding a method in C#, meanwhile, _does_ break things.)

Thus, you want:

		public override View GetView(int position, View convertView, ViewGroup parent) {

With those two changes, the sample works for me.

 - Jon