Xamarin Android - 在Fragment

Question

我正在尝试在Fragment中的GridView中绑定Image。片段正在加载但它是空白的。我把断点放在ImageAdapeter的GetView方法上，但它没有击中断点。这是片段空白的原因吗？

这是我的代码

片段代码：

public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        ViewGroup root = (ViewGroup)inflater.Inflate(Resource.Layout.profilefragmentlayout, null);

        var PhotoGridView = root.FindViewById<GridView>(Resource.Id.PhotoGridView);

        PhotoGridView.Adapter = new ImageAdapter(root.Context);

        return root;
    }

ImageAdapter代码

    public class ImageAdapter: BaseAdapter
{
    Context contextcreate; 
    public ImageAdapter(Context a)
    {
        contextcreate = a;
    }

    public override int Count
    {
        get { return imageIds.Length; }
    }

    public override Java.Lang.Object GetItem(int position)
    {
        return null;
    }

    public override long GetItemId(int position)
    {
        return 0;
    }

    public override View GetView(int position, View convertView, ViewGroup parent)
    {
        ImageView imageView;
        if (convertView == null)
        {
            imageView = new ImageView(contextcreate);
            imageView.LayoutParameters = new GridView.LayoutParams(50, 50);
            imageView.SetScaleType(ImageView.ScaleType.CenterCrop);
            imageView.SetPadding(5, 5, 5, 5);
        }
        else
        {
            imageView = (ImageView)convertView;
        } 
        imageView.SetImageResource(imageIds[position]);
        return imageView;
    } 
    int[] imageIds = { 
        Resource.Drawable.WP1, Resource.Drawable.WP2, 
        Resource.Drawable.WP3, Resource.Drawable.WP4, 
        Resource.Drawable.WP5, Resource.Drawable.WP6, 
        Resource.Drawable.WP7, Resource.Drawable.WP8, 
        Resource.Drawable.WP9, Resource.Drawable.WP10,  
        Resource.Drawable.WP11, Resource.Drawable.WP12,  
    };
}

}

请告诉我我遗失的内容，即停止在网格视图中将图像绑定在片段中。

Answer 1

在片段类中添加此代码

 public class OneFragment : Fragment
    {
        public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
        {
            View view = inflater.Inflate(Resource.Layout.One, null);
            var gridview = view.FindViewById<GridView>(Resource.Id.gridview);
            gridview.Adapter = new ImageAdapter(Activity);

            gridview.ItemClick += delegate (object sender, AdapterView.ItemClickEventArgs args) {
                Toast.MakeText(Activity, args.Position.ToString(), ToastLength.Short).Show();
            };
            return view;
        }
    }

添加ImageAdapter类并在ImageAdapter类

中添加此代码

 public class ImageAdapter : BaseAdapter
    {
        Context context;

        public ImageAdapter(Context c)
        {
            context = c;
        }

        public override int Count
        {
            get { return thumbIds.Length; }
        }

        public override Java.Lang.Object GetItem(int position)
        {
            return null;
        }

        public override long GetItemId(int position)
        {
            return 0;
        }

        // create a new ImageView for each item referenced by the Adapter
        public override View GetView(int position, View convertView, ViewGroup parent)
        {
            ImageView imageView;

            if (convertView == null)
            {  // if it's not recycled, initialize some attributes
                imageView = new ImageView(context);
                imageView.LayoutParameters = new GridView.LayoutParams(85, 85);
                imageView.SetScaleType(ImageView.ScaleType.CenterCrop);
                imageView.SetPadding(8, 8, 8, 8);
            }
            else
            {
                imageView = (ImageView)convertView;
            }

            imageView.SetImageResource(thumbIds[position]);
            return imageView;
        }

        // references to our images
        int[] thumbIds = {
        Resource.Drawable.Icon, Resource.Drawable.Icon,
        Resource.Drawable.Icon, Resource.Drawable.Icon,
        Resource.Drawable.Icon, Resource.Drawable.Icon,
        Resource.Drawable.Icon, Resource.Drawable.Icon,
        Resource.Drawable.Icon, Resource.Drawable.Icon,
        Resource.Drawable.Icon, Resource.Drawable.Icon,
        Resource.Drawable.Icon, Resource.Drawable.Icon,
        Resource.Drawable.Icon, Resource.Drawable.Icon,
        Resource.Drawable.Icon, Resource.Drawable.Icon,
    };
    }

它为我工作