Question

我在构建项目时遇到上述错误。方法引用的上下文不同，所以我不知道是什么导致了错误。我在app中有一个文件浏览功能。所以取决于调用的是哪个活动在浏览器中，用户可以选择文件夹或文件并返回其路径。

public class FileListAdapter : ArrayAdapter<FileSystemInfo>
{

private readonly Context _context;

    public FileListAdapter(Context context, IList<FileSystemInfo> fsi)
        : base(context, Resource.Layout.file_picker_list_item, Android.Resource.Id.Text1, fsi)
    {
        _context = context;
    }
    public override View GetView(int position, View convertView, ViewGroup parent)
    {
        var fileSystemEntry = GetItem(position);

        FileListRowViewHolder viewHolder;
        View row;



        if (convertView == null)
        {
            row = _context.GetLayoutInflater().Inflate(Resource.Layout.file_picker_list_item, parent, false);
            viewHolder = new FileListRowViewHolder(row.FindViewById<TextView>(Resource.Id.file_picker_text), row.FindViewById<ImageView>(Resource.Id.file_picker_image));
            row.Tag = viewHolder;
        }
        else
        {
            row = convertView;
            viewHolder = (FileListRowViewHolder)row.Tag;
        }
        viewHolder.Update(fileSystemEntry.Name, fileSystemEntry.IsDirectory() ? Resource.Drawable.folder : Resource.Drawable.file);

        return row;
    }



}

第二课：

public class FolderListAdapter : ArrayAdapter<DirectoryInfo>
{
   public override View GetView(int position, View convertView, ViewGroup parent)
    {

private readonly Context _context;


    public FolderListAdapter(Context context, IList<DirectoryInfo> fsi)
        : base(context, Resource.Layout.file_picker_list_item, Android.Resource.Id.Text1, fsi)
    {
        _context = context;
    }
        var fileSystemEntry = GetItem(position);

        FileListRowViewHolder viewHolder;
        View view = convertView;



        if (convertView == null)
        {
            view = _context.GetLayoutInflater().Inflate(Resource.Layout.folder_picker_list_item, parent, false);
            viewHolder = new FileListRowViewHolder(view.FindViewById<TextView>(Resource.Id.folder_picker_text), view.FindViewById<ImageView>(Resource.Id.folder_picker_image));
            view.Tag = viewHolder;
        }
        else
        {
            view = convertView;
            viewHolder = (FileListRowViewHolder)view.Tag;
        }
        viewHolder.Update(fileSystemEntry.Name, fileSystemEntry.IsDirectory() ? Resource.Drawable.folder : Resource.Drawable.file);

        return view;
    }


}

这两行中的这些行都出现错误：

                view = _context.GetLayoutInflater().Inflate(Resource.Layout.folder_picker_list_item, parent, false);

Answer 1

我解决了构建错误。这是一个很小的问题。上下文是问题。所以我只是改变了有问题的语境＆＃39;指向Activity.From this：

public static LayoutInflater GetLayoutInflater(this Context context)
    {
        return context.GetSystemService(Context.LayoutInflaterService).JavaCast<LayoutInflater>();


    }

对此：

public static LayoutInflater GetLayoutInflater(Activity context)
    {
        return context.GetSystemService(Activity.LayoutInflaterService).JavaCast<LayoutInflater>();
    }

Xamarin.Android-以下方法或属性之间的调用不明确

1 个答案: