Episode 16: Connecting to Firestore on Android

Author: LetsCreateSeries

TimeTrackerTutorial.Android/ServiceListeners/OnCompleteListener.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Threading.Tasks;
+using Android.Gms.Tasks;
+using Firebase.Firestore;
+using TimeTrackerTutorial.Models;
+
+namespace TimeTrackerTutorial.Droid.ServiceListeners
+{
+    public class OnCompleteListener : Java.Lang.Object, IOnCompleteListener
+    {
+        private TaskCompletionSource<AuthenticatedUser> _tcs;
+
+        public OnCompleteListener(TaskCompletionSource<AuthenticatedUser> tcs)
+        {
+            _tcs = tcs;
+        }
+
+        public void OnComplete(Android.Gms.Tasks.Task task)
+        {
+            if (task.IsSuccessful)
+            {
+                // process document
+                var result = task.Result;
+                if (result is DocumentSnapshot doc)
+                {
+                    var user = new AuthenticatedUser();
+                    user.Id = doc.Id;
+                    user.FirstName = doc.GetString("FirstName");
+                    user.LastName = doc.GetString("LastName");
+                    _tcs.TrySetResult(user);
+                    return;
+                }
+            }
+            // something went wrong
+            _tcs.TrySetResult(default(AuthenticatedUser));
+        }
+    }
+}

TimeTrackerTutorial.Android/Services/AccountService.cs

@@ -2,8 +2,11 @@
 using System.Threading.Tasks;
 using Firebase;
 using Firebase.Auth;
+using Firebase.Firestore;
 using Java.Util.Concurrent;
+using TimeTrackerTutorial.Droid.ServiceListeners;
 using TimeTrackerTutorial.Droid.Services;
+using TimeTrackerTutorial.Models;
 using TimeTrackerTutorial.Services.Account;
 using Xamarin.Essentials;
 using Xamarin.Forms;
@@ -88,5 +91,18 @@ public Task<bool> VerifyOtpCodeAsync(string code)
             }
             return Task.FromResult(false);
         }
+
+        public Task<AuthenticatedUser> GetUserAsync()
+        {
+            var tcs = new TaskCompletionSource<AuthenticatedUser>();
+
+            FirebaseFirestore.Instance
+                .Collection("users")
+                .Document(FirebaseAuth.Instance.CurrentUser.Uid)
+                .Get()
+                .AddOnCompleteListener(new OnCompleteListener(tcs));
+
+            return tcs.Task;
+        }
     }
 }

TimeTrackerTutorial.Android/TimeTrackerTutorial.Android.csproj

@@ -55,14 +55,17 @@
   <ItemGroup>
     <PackageReference Include="Xamarin.Forms" Version="4.4.0.991265" />
     <PackageReference Include="Xamarin.Essentials" Version="1.5.3.2" />
+    <PackageReference Include="Xamarin.Build.Download">
+      <Version>0.10.0</Version>
+    </PackageReference>
     <PackageReference Include="Xamarin.Firebase.Analytics">
-      <Version>60.1142.1</Version>
+      <Version>71.1630.4</Version>
     </PackageReference>
     <PackageReference Include="Xamarin.Firebase.Auth">
-      <Version>60.1142.1</Version>
+      <Version>71.1605.4</Version>
     </PackageReference>
-    <PackageReference Include="Xamarin.Build.Download">
-      <Version>0.10.0</Version>
+    <PackageReference Include="Xamarin.Firebase.Firestore">
+      <Version>71.1705.4</Version>
     </PackageReference>
   </ItemGroup>
   <ItemGroup>
@@ -71,6 +74,7 @@
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Renderers\HoursProgressViewRenderer.cs" />
     <Compile Include="Services\AccountService.cs" />
+    <Compile Include="ServiceListeners\OnCompleteListener.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="Resources\AboutResources.txt" />
@@ -99,6 +103,7 @@
     <Folder Include="Resources\drawable\" />
     <Folder Include="Renderers\" />
     <Folder Include="Services\" />
+    <Folder Include="ServiceListeners\" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\TimeTrackerTutorial\TimeTrackerTutorial.csproj">

TimeTrackerTutorial/Models/AuthenticatedUser.cs

@@ -0,0 +1,10 @@
+using System;
+namespace TimeTrackerTutorial.Models
+{
+    public class AuthenticatedUser
+    {
+        public string Id { get; set; }
+        public string FirstName { get; set; }
+        public string LastName { get; set; }
+    }
+}

TimeTrackerTutorial/Services/Account/IAccountService.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Text;
 using System.Threading.Tasks;
+using TimeTrackerTutorial.Models;
 
 namespace TimeTrackerTutorial.Services.Account
 {
@@ -11,5 +12,7 @@ public interface IAccountService
         Task<double> GetCurrentPayRateAsync();
         Task<bool> SendOtpCodeAsync(string phoneNumber);
         Task<bool> VerifyOtpCodeAsync(string code);
+
+        Task<AuthenticatedUser> GetUserAsync();
     }
 }

TimeTrackerTutorial/Services/Account/MockAccountService.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Text;
 using System.Threading.Tasks;
+using TimeTrackerTutorial.Models;
 
 namespace TimeTrackerTutorial.Services.Account
 {
@@ -12,6 +13,11 @@ public Task<double> GetCurrentPayRateAsync()
             return Task.FromResult(10.0);
         }
 
+        public Task<AuthenticatedUser> GetUserAsync()
+        {
+            throw new NotImplementedException();
+        }
+
         public Task<bool> LoginAsync(string username, string password)
         {
             if (string.IsNullOrWhiteSpace(username) || string.IsNullOrWhiteSpace(password))