Question 119893 in Firebase Question posted in
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Read data from firebase c#

I cant find a way to read data from firebase databse in c# android application.
I want to read value from child data/test. Question appers to be very simple, couldnt find a aimple way which i would understand online

DATABASE picture:
data
Problem with reading screens
before
after

Working connection:

        var options = new Firebase.FirebaseOptions.Builder()
            .SetApplicationId("1:191485419818:android:c3bef44f30f167e537be53")
            .SetApiKey("AIzaSyBwLcDZ3wGyzkwP6SobH8KDDsl5Vq227Vg")
            .Build();

        if (fireApp == null)
            fireApp = FirebaseApp.InitializeApp(this, options);

        auth = FirebaseAuth.GetInstance(fireApp);

        string FirebaseURL = "https://plsbrothers-default-rtdb.firebaseio.com/";
        FirebaseClient rootNode = new FirebaseClient(FirebaseURL);

        dataNode = rootNode.Child("data");
        userNode = rootNode.Child("users");

//Trying to access the saved data and display it. Dont know it it is an issue with converting data to string and displaying it or i dont even access it properly (it shows Firebase.Database.Query.childQuery and not the data i want to display)

string testDisplay = dataNode.Child("test").ToString();
      
          TextView currentCharacterName = FindViewById<TextView>(Resource.Id.test);
          currentCharacterName.Text = testDisplay;

XML CODE:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:orientation="vertical"
android:padding="16dp"
android:layout_height="match_parent">


<Button
         android:layout_width="match_parent"
         android:layout_height="100dp"
         android:text="save"
         android:textSize="25dp"
         android:textColor="#000"
         android:id="@+id/Btn"
         android:layout_marginTop="280dp"
/>

<TextView
    android:text="starting value"
    android:textSize="30dp"
    android:textColor="#000"
    android:layout_marginTop="100dp"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/test" />
Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    Connection:

    FirebaseClient firebaseClient = new FirebaseClient("Your Firebase URL");

    Data Class, in these example it will be GalleryModel

    public class GalleryModel
{
    public string Id { get; set; }

    public string Name{ get; set; }

}

    Generete new file(optionally) for Tasks. In these case file name is GalleryRepo

     public async Task<List<GalleryModel>>GetAll()
    {
        return (await firebaseClient.Child(nameof(GalleryModel)).OnceAsync<GalleryModel>()).Select(item => new GalleryModel
        {
            
            Name = item.Object.Name,
            Id = item.Key

        }).ToList();
    }

    Create new xml file.

    <StackLayout>
        <ListView x:Name="galleryListView" ItemsSource="{Binding gallerylist}" HasUnevenRows="True">
            <ListView.ItemTemplate>
                <DataTemplate>
                    <ViewCell>

                        <StackLayout Orientation="Horizontal" Padding="5">

                            <StackLayout HorizontalOptions="StartAndExpand">

                                <Label Text="{Binding Name}" FontSize="Medium"/>
                                <Label Text="{Binding Id}" FontSize="Medium"/>                 
                               
                            </StackLayout>
                        </StackLayout>

                    </ViewCell>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>
    </StackLayout>

    Than in xml cs file

    GalleryRepo galrepo = new GalleryRepo();

protected override async void OnAppearing()
    {

        var gallerylist = await GetAll();
        datesListView.ItemsSource = gallerylist;


    }

  2. 0 
    //string testDisplay = dataNode.Child("test").ToString();
DatabaseReference testNode = dataNode.child("test");
string email = testNode.Object.Email.ToString()
string name = testNode.Object.Name.ToString()

TextView currentCharacterName = FindViewById<TextView>(Resource.Id.test);
currentCharacterName.Text = email;
currentCharacterName.Invalidate();

    //Please add the Invalidate() method.

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