C# Xamarin Fragment won't launch

Question

I'm struggling with a problem!

I created a Fragment to fill a page with text, so here is the full OnCreateView:

public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    View view = inflater.Inflate(Resource.Layout.ProductInfo, container, false);

    List<products> SelectedCoinList = (from productname in coinList
                                       where productname.ProductName.Contains(SelectedProductName, StringComparison.OrdinalIgnoreCase)
                                       select productname).ToList<products>();

    ImageView ProductLogo = view.FindViewById<ImageView>(Resource.Id.ProductInfoLogo);

    var imageBitmap = GetImageBitmapFromUrl("http://******/thumbnails/" + SelectedProductList[position].Symbol + ".png");
    ProductLogo.SetImageBitmap(imageBitmap);

    TextView txtProductInfoName = view.FindViewById<TextView>(Resource.Id.txtProductInfoName);
    txtProductInfoName.Text = SelectedProductList[position].FullName;

    TextView txtProductInfoPrice = view.FindViewById<TextView>(Resource.Id.txtProductInfoPrice);
    txtProductInfoPrice.Text = "€ " + SelectedProductList[position].Price;

    return view;
}

And in the MainActivity.cs I have this code that (is supposed to) start the Fragment:

public void ListViewProducts_ItemClick(object sender, AdapterView.ItemClickEventArgs e) {
    //Give variables the right value to share with other classes
    ProductName = productsList[e.Position].ProductNameName;
    position = e.Position;

    // Set view to Info 
    SetContentView(Resource.Layout.ProductInfo);
}

public string GetProductName() {
    return ProductName; //return your mainActivity list
}

The problem is that the Fragment doesn't start or something, because it loads the ProductInfo page, but with the default text. I figured this out by placing breakpoints in the OnCreateView, but they weren't used.

Any suggestions?

Answer 1

you need to create an instance of your fragment and insert it into a view in your Activity layout. for example you can use a FrameLayout. in activities layout add a frame layout

<FrameLayout
    android:id="@+id/fragmentContainer"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

use the attribute android:visibility="gone"

if you want the frameLayout to be invisible and take up no space when your activity starts.

then in your activity have a method like so

private YourFragment _fragment;
private void DisplayFragment()
{
    var fragmentContainer = FindViewById<FrameLayout> 
       (Resource.Id.fragmentContainer);
    _fragment= new YourFragment();
    var fragmentManager = FragmentManager.BeginTransaction();
    fragmentManager.Add(Resource.Id.fragmentContainer, _fragment);
    fragmentManager.Commit();
    fragmentContainer .Visibility = ViewStates.Visible; //Makes your fragment container visible if you set visibility=gone"

}