How to assign OnActivityResult values to the Listview? - xamarin

Question

I have a Listview and Click Events in the respective listItems and need to get result back from the click events and populate on the List.
My BaseAdapter class is
public class RemnantListAdapter : BaseAdapter<InventorySlabs>
{
private PartialInventory context;
private List<InventorySlabs> RemnantList;
public RemnantListAdapter(PartialInventory partialInventory, List<InventorySlabs> remnantList)
{
this.context = partialInventory;
this.RemnantList = remnantList;
}
public override InventorySlabs this[int position]
{
get
{
return RemnantList[position];
}
}
public override int Count
{
get
{
return RemnantList.Count;
}
}
public override long GetItemId(int position)
{
return position;
}
public override int ViewTypeCount
{
get
{
return Count;
}
}
public override int GetItemViewType(int position)
{
return position;
}
private class remnantHolder : Object
{
public Button EditRemnant1;
public TextView Remnant1 = null;
public TextView Rem_StockNMaterial1 = null;
public TextView Rem_Dimensions1 = null;
public TextView Rem_Status1 = null;
}
public override View GetView(int position, View convertView, ViewGroup parent)
{
remnantHolder holder = null;
if (convertView == null)
{
convertView = (convertView ?? context.LayoutInflater.Inflate(Resource.Layout.remnant_list, parent, false));
holder = new remnantHolder();
holder.EditRemnant1 = convertView.FindViewById<Button>(Resource.Id.editRemnant1);
holder.Remnant1 = convertView.FindViewById<TextView>(Resource.Id.remnant1);
holder.Rem_StockNMaterial1 = convertView.FindViewById<TextView>(Resource.Id.remnant_mtrl1);
holder.Rem_Dimensions1 = convertView.FindViewById<TextView>(Resource.Id.remnant_dimens1);
holder.Rem_Status1 = convertView.FindViewById<TextView>(Resource.Id.remnant_status1);
try
{
InventorySlabs remnantModel = this.RemnantList[position];
if (remnantModel != null)
{
holder.Remnant1.Text = "#" + remnantModel.ExtSlabNo;
holder.Rem_StockNMaterial1.Text = remnantModel.SellName + "-" + remnantModel.Depth + "-" + remnantModel.Finish;
double sqft = (remnantModel.Width * remnantModel.Height) / 144;
holder.Rem_Dimensions1.Text = "(" + remnantModel.Width.ToString() + " * " + remnantModel.Height.ToString() + ")" + sqft.ToString("N2");
holder.Rem_Status1.Text = remnantModel.Status;
holder.EditRemnant1.Click += delegate (object sender, System.EventArgs args)
{
if (remnantModel != null)
{
Intent intent = new Intent(context, typeof(EditRemnant));
intent.PutExtra("OpenPopType", 2);
intent.PutExtra("SlabNo", remnantModel.ExtSlabNo);
context.StartActivityForResult(intent, 1);
}
};
}
}
catch (Exception ex)
{
var method = System.Reflection.MethodBase.GetCurrentMethod();
var methodName = method.Name;
var className = method.ReflectedType.Name;
MainActivity.SaveLogReport(className, methodName, ex);
}
convertView.Tag = holder;
}
else
{
holder = (remnantHolder)convertView.Tag;
}
return convertView;
}
public void ActivityResult(int requestCode, Result resultCode, Intent data)
{
switch (requestCode)
{
case 1:
if (data != null)
{
try
{
string remSlab = data.GetStringExtra("extSlabNo");
if (remSlab != null)
{
remnantData.Width = double.Parse(data.GetStringExtra("remWidth"));
remnantData.Height = double.Parse(data.GetStringExtra("remHeight"));
double sqft = (remnantData.Width * remnantData.Height) / 144;
Rem_Dimensions.Text = "(" + remnantData.Width.ToString() + " * " + remnantData.Height.ToString() + ")" + sqft.ToString("N2");
}
}
catch (Exception ex)
{
var method = System.Reflection.MethodBase.GetCurrentMethod();
var methodName = method.Name;
var className = method.ReflectedType.Name;
MainActivity.SaveLogReport(className, methodName, ex);
}
}
break;
}
}
}
In my Main Activity
I am calling the Result as
protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
remnantListAdapter.ActivityResult(requestCode, resultCode, data);
}
After editing the details in Edit view of the ListItem and close the Popup, I am not knowing how to Pass the Values to the Holder to Update in Listview.

Answer 1

You could pass the positon to the new activity in the click event and pass it back with the result intent.
For example:
holder.EditRemnant1.Click += delegate (object sender, System.EventArgs args)
{
if (remnantModel != null)
{
Intent intent = new Intent(context, typeof(EditRemnant));
intent.PutExtra("OpenPopType", 2);
intent.PutExtra("SlabNo", remnantModel.ExtSlabNo);
intent.PutExtra("Position", position );
context.StartActivityForResult(intent, 1);
}
};
And in the new activity:
protected override void OnCreate(Bundle savedInstanceState)
{
Intent intent = Intent;
var position =intent.GetIntExtra("Position", -1);
base.OnCreate(savedInstanceState);
Intent data = new Intent();
String text = "extSlabNo";
data.PutExtra("extSlabNo", text);
data.PutExtra("remWidth", 10);
data.PutExtra("remHeight", 20);
data.PutExtra("Position", position);
SetResult(Result.Ok, data);
}
Then you could modify the data in the adapter according to the positon value:
public void ActivityResult(int requestCode, Result resultCode, Intent data)
{
switch (requestCode)
{
case 1:
if (data != null)
{
try
{
string remSlab = data.GetStringExtra("extSlabNo");
int position = data.GetIntExtra("Position", -1);
if (remSlab != null && position >= 0)
{
RemnantList[position].Width = data.GetIntExtra("remWidth", -1);
RemnantList[position].Height = data.GetIntExtra("remHeight", -1);
NotifyDataSetChanged();
}
}
catch (Exception ex)
{
var method = System.Reflection.MethodBase.GetCurrentMethod();
var methodName = method.Name;
var className = method.ReflectedType.Name;
MainActivity.SaveLogReport(className, methodName, ex);
}
}
break;
}
And reset the adapter in MainActivity OnActivityResult() method :
public class MainActivity : AppCompatActivity
{
RemnantListAdapter remnantListAdapter;
ListView listView;
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.activity_main);
List<InventorySlabs> remnantList = new List<InventorySlabs>();
for(var i = 0; i < 10; i++)
{
InventorySlabs inventorySlabs = new InventorySlabs();
inventorySlabs.Depth = i.ToString();
inventorySlabs.ExtSlabNo = i.ToString();
inventorySlabs.Finish = "Finish" + i.ToString();
inventorySlabs.Height = 200;
inventorySlabs.SellName = "SellName" + i.ToString();
inventorySlabs.Status = "Status" + i.ToString();
inventorySlabs.Width = 400;
remnantList.Add(inventorySlabs);
}
listView = FindViewById<ListView>(Resource.Id.listView1);
remnantListAdapter = new RemnantListAdapter(this, remnantList);
listView.Adapter = remnantListAdapter;
}
protected override void OnActivityResult(int requestCode, [GeneratedEnum] Result resultCode, Intent data)
{
remnantListAdapter.ActivityResult(requestCode, resultCode, data);
listView.Adapter = remnantListAdapter;
}
}