How to Retrieve Webview URL from Firebase Realtime Database in Xamarin.android (c#) ?

Question

How to Retrieve Webview URL from FIrebase Realtime Database in Xamarin.android (c#) ? I can't find any command or any examples for C#, Full of people are use the java but no one use c# android so ı need to help.

This is correctly I need the resource but this solution is write by java, I need the same as but in Xamarin.android(c#).

watch

Link the video: https://www.youtube.com/watch?v=ypRdHO-w8-o&list=PLblLWXxsNTovcxFGQh3D0CnVjsUXBuY8q&index=3

Answer 1

Hello,​

Welcome to our Microsoft Q&A platform!

First of all, you need to install following nuget package in your xamarin.android project.

   Xamarin.Firebase.Database  

Then do not forget to download your google-services.json file from firebase console, and set the build action to GoogleServicesJson

Then you can use following code to retrieve Webview URL from Firebase Realtime Database in Xamarin.android

   using Firebase.Database;  
     
     
     
    protected override void OnCreate(Bundle savedInstanceState)  
           {  
               base.OnCreate(savedInstanceState);  
               Xamarin.Essentials.Platform.Init(this, savedInstanceState);  
               // Set our view from the "main" layout resource  
               SetContentView(Resource.Layout.activity_main);  
     
               WebView webView1 = FindViewById<WebView>(Resource.Id.webView1);  
               webView1.Settings.JavaScriptEnabled = true;  
               webView1.SetWebChromeClient(new MyWebChromeClient());  
               string firebaseURL = "https://fir-databasedemo-xxxxa72.firebaseio.com/";  
               var mDatabase = FirebaseDatabase.GetInstance(firebaseURL).GetReference("fir-databasedemo-xxxxa72");  
               DatabaseReference reference = mDatabase.Child("url");  
     
               reference.AddValueEventListener(new MyValueChangeLisenter(webView1));  
   }  
     
    internal class MyWebChromeClient : WebChromeClient  
       {  
       }  
     
       internal class MyValueChangeLisenter : Java.Lang.Object, IValueEventListener  
       {  
           private WebView webView1;  
     
           public MyValueChangeLisenter(WebView webView1)  
           {  
               this.webView1 = webView1;  
           }  
     
           public void OnCancelled(DatabaseError error)  
           {  
              // throw new NotImplementedException();  
           }  
     
           public void OnDataChange(DataSnapshot snapshot)  
           {  
               // throw new NotImplementedException();  
     
               webView1.LoadUrl(snapshot.Value.ToString());  
           }  
       }  

Best Regards,

Leon Lu

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Answer 2

I have a error, the Null expectection, I am already connect the firebase to my project. I dont know why, please check it

This is my last day results, today ı have no data.