使用filepicker选择一个文本文件，并将该文本文件的内容加载到Xamarin Android的编辑文本中

using System;
using System.IO;
using Android.App;
using Android.OS;
using Android.Widget;
using Xamarin.Essentials;

namespace YourNamespace
{
    [Activity(Label = "YourActivity")]
    public class YourActivity : Activity
    {
        private Button filePickerButton;
        private EditText editText;

        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            SetContentView(Resource.Layout.YourLayout);

            filePickerButton = FindViewById<Button>(Resource.Id.filePickerButton);
            editText = FindViewById<EditText>(Resource.Id.editText);

            filePickerButton.Click += FilePickerButton_Click;
        }

        private async void FilePickerButton_Click(object sender, EventArgs e)
        {
            try
            {
                var file = await FilePicker.PickAsync();
                if (file != null)
                {
                    string filePath = file.FullPath;
                    string fileContent = File.ReadAllText(filePath);
                    editText.SetText(fileContent, TextView.BufferType.Normal);
                }
            }
            catch (Exception ex)
            {
                // 处理异常情况
            }
        }
    }
}