simplenotesdroid/NoteActivity.cs

using System.Net;
using System.Net.Http.Json;
using System.Text.Json.Serialization;
using Android.Views;
using AndroidX.AppCompat.App;
using Google.Android.Material.Color;
using Google.Android.Material.FloatingActionButton;
using Google.Android.Material.Snackbar;
using Google.Android.Material.TextField;

namespace SimpleNotes;

[Activity(Label = "@string/note_page",Theme ="@style/Theme.SimpleNotes")]
public class NoteActivity : AppCompatActivity
{
    public override bool OnCreateOptionsMenu(IMenu? menu)
    {
        MenuInflater.Inflate(Resource.Menu.menu_note,menu);
        return true;
    }
    Func<Task> Save;
    public override bool OnOptionsItemSelected(IMenuItem item)
    {
        int id=item.ItemId;
        if(id == Resource.Id.action_save)
        {
            if(Save != null)
                Task.Run(Save).Wait(0);
        }
        return base.OnOptionsItemSelected(item);
    }
    
    protected override async void OnCreate(Bundle? savedInstanceState)
    {
        base.OnCreate(savedInstanceState);
        DynamicColors.ApplyToActivityIfAvailable(this);
        // Set our view from the "main" layout resource
        SetContentView(Resource.Layout.activity_note);
        SetSupportActionBar(FindViewById<AndroidX.AppCompat.Widget.Toolbar>(Resource.Id.toolbar2));
        var (endpoint,username,password) = MainActivity.GetPrefs(this);
          
        //check for id
        var note_title = FindViewById<TextInputEditText>(Resource.Id.note_title);
        var note_body = FindViewById<TextInputEditText>(Resource.Id.note_body);
        
        if(note_title == null || note_body == null) return;
        

        long id = Intent?.GetLongExtra("note_id",0) ?? 0;

        if(id > 0)
        {
             if(!string.IsNullOrWhiteSpace(endpoint) && !string.IsNullOrWhiteSpace(username) && !string.IsNullOrWhiteSpace(password))
            {
                var request = new HttpRequestMessage(HttpMethod.Get,$"{endpoint}/api/note?id={id}");
                request.Headers.Add("Authorization",$"Basic {Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes($"{username}:{password}"))}");
                var response=await MainActivity.Client.SendAsync(request);
                var note = response.StatusCode == HttpStatusCode.OK ? (await response.Content.ReadFromJsonAsync<_NoteResponse>())?.Note : null;
                if(note != null)
                {
                    note_title.Text = note.Title;
                    this.Title = note.Title;
                    note_body.Text = note.Body;
                }
            }
            
        }
        note_title.TextChanged += (sender,e)=>{
            this.Title = note_title.Text;    
        };
        async Task<long> SaveNote(Note note)
        {
            var request = new HttpRequestMessage(HttpMethod.Post,$"{endpoint}/api/note");
            request.Headers.Add("Authorization",$"Basic {Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes($"{username}:{password}"))}");
            request.Content = new System.Net.Http.StringContent(System.Text.Json.JsonSerializer.Serialize(note),new System.Net.Http.Headers.MediaTypeHeaderValue("application/json"));

            var result=await MainActivity.Client.SendAsync(request);
            if(result.StatusCode == HttpStatusCode.OK)
            {
                var res2=await result.Content.ReadFromJsonAsync<_NoteResponse>();
                return res2?.Note?.Id ?? 0;
            }
            return 0;
        }
        Save = async()=>{
            
            var note = new Note();
            note.Id = id;
            this.RunOnUiThread(()=>{
            note.Title = note_title.Text ?? "";
            note.Body = note_body.Text ?? "";
            });
            if(!string.IsNullOrWhiteSpace(endpoint) && !string.IsNullOrWhiteSpace(username) && !string.IsNullOrWhiteSpace(password))
            {
                   
                    id=await Task.Run(async()=>await SaveNote(note));
                    

                    this.RunOnUiThread(()=>{
                        
                        Toast.MakeText(this,"Saved Note",ToastLength.Long)?.Show();
                    });
                
            }
        };
    }
    
}
public class _NoteResponse
{
    [JsonPropertyName("success")]
    public bool Success {get;set;}

    [JsonPropertyName("note")]
    public Note Note {get;set;}=new Note();
}
public class Note
{    
    [JsonPropertyName("id")]
    public long Id {get;set;}

    [JsonPropertyName("title")]
    public string Title {get;set;}="";

    [JsonPropertyName("body")]
    public string Body {get;set;}="";
}