Android

Hi,
In Android Studion ,<pre>why the methods are crossed out here ?
because when I insert AsyncTask the methods don't work

package com.example.entertainmentlab.ui.store;
    
    import android.os.Bundle;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.ImageView;
    import android.widget.TextView;
    import android.widget.Toast;
    
    import androidx.annotation.NonNull;
    import androidx.annotation.Nullable;
    import androidx.fragment.app.Fragment;
    import androidx.fragment.app.FragmentManager;
    import androidx.fragment.app.FragmentTransaction;
    import androidx.lifecycle.Observer;
    import androidx.lifecycle.ViewModelProviders;
    
    import com.example.entertainmentlab.R;
    import com.example.entertainmentlab.ui.setting.SettingViewModel;
    
    public class StoreFragment extends Fragment {
    
        private StoreViewModel StoreViewModel;
    
        public View onCreateView(@NonNull LayoutInflater inflater,
                                 ViewGroup container, Bundle savedInstanceState) {
            StoreViewModel =
                    ViewModelProviders.of(this).get(StoreViewModel.class);
            View root = inflater.inflate(R.layout.fragment_store, container, false);
           final ImageView MusicButton = root.findViewById(R.id.music_btn);
    
    
    
    
    
    
    
            MusicButton.setOnClickListener(new View.OnClickListener() {
               @Override
               public void onClick(View v) {
                   try {
    
                       Fragment fragment = new BlankFragment();
                       FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
                       FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
                       fragmentTransaction.replace(R.id.nav_host_fragment_container, fragment);
                       fragmentTransaction.addToBackStack(null);
                       fragmentTransaction.commit();
                   }catch (Exception e ){
                       Toast.makeText(getActivity(), "erro  "+e, Toast.LENGTH_SHORT).show();
                   }
               }
           });
    //        StoreViewModel.getText().observe(getViewLifecycleOwner(), new Observer<String>() {
    //            @Override
    //            public void onChanged(@Nullable String s) {
    //                textView.setText(s);
    //            }
    //        });
            return root;

public static string RestUrl = DeviceInfo.Platform ==
    DevicePlatform.Android ?
        "http://10.0.2.2:44300/api/todoitems/{0}" :
        "http://localhost:44300/api/todoitems/{0}";

public async Task> RefreshDataAsync()
{
    Items = new List();

    Uri uri = new Uri(string.Format(Constants.RestUrl, string.Empty));
    try
    {
        HttpResponseMessage response = await client.GetAsync(uri);
        if (response.IsSuccessStatusCode)
        {
            string content = await response.Content.ReadAsStringAsync();
            Items = JsonConvert.DeserializeObject>(content);
        }
    }
    catch (Exception ex)
    {
        Debug.WriteLine(@"\tERROR {0}", ex.Message);
    }

    return Items;
}

{Java.Net.SocketException: Connection reset
  at Java.Interop.JniEnvironment+InstanceMethods.CallIntMethod (Java.Interop.JniObjectReference instance, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args) [0x0006e] in :0 
  at Java.Interop.JniPeerMembers+JniInstanceMethods.InvokeVirtualInt32Method (System.String encodedMember, Java.Interop.IJavaPeerable self, Java.Interop.JniArgumentValue* parameters) [0x0002a] in :0 
  at Java.Net.HttpURLConnection.get_ResponseCode () [0x0000a] in :0 
  at Xamarin.Android.Net.AndroidClientHandler+<>c__DisplayClass46_0.b__2 () [0x00000] in :0 
  at System.Threading.Tasks.Task`1[TResult].InnerInvoke () [0x0000f] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Future.cs:534 
  at System.Threading.Tasks.Task.Execute () [0x00000] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2319 
--- End of stack trace from previous location where exception was thrown ---

  at Xamarin.Android.Net.AndroidClientHandler.DoProcessRequest (System.Net.Http.HttpRequestMessage request, Java.Net.URL javaUrl, Java.Net.HttpURLConnection httpConnection, System.Threading.CancellationToken cancellationToken, Xamarin.Android.Net.AndroidClientHandler+RequestRedirectionState redirectState) [0x00372] in :0 
  at Xamarin.Android.Net.AndroidClientHandler.SendAsync (System.Net.Http.HttpRequestMessage request, System.Threading.CancellationToken cancellationToken) [0x002d0] in :0 
  at System.Net.Http.HttpClient.FinishSendAsyncBuffered (System.Threading.Tasks.Task`1[TResult] sendTask, System.Net.Http.HttpRequestMessage request, System.Threading.CancellationTokenSource cts, System.Boolean disposeCts) [0x0017e] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/corefx/src/System.Net.Http/src/System/Net/Http/HttpClient.cs:506 
  at TodoREST.RestService.RefreshDataAsync () [0x0006b] in C:\Projects\SandBox\Xamarin\Mirosoft Examples\Web Services\ToDoREST\TodoREST\Data\RestService.cs:30 
  --- End of managed Java.Net.SocketException stack trace ---
java.net.SocketException: Connection reset
    at java.net.SocketInputStream.read(SocketInputStream.java:209)
    at java.net.SocketInputStream.read(SocketInputStream.java:139)
    at com.android.okhttp.okio.Okio$2.read(Okio.java:136)
    at com.android.okhttp.okio.AsyncTimeout$2.read(AsyncTimeout.java:211)
    at com.android.okhttp.okio.RealBufferedSource.indexOf(RealBufferedSource.java:306)
    at com.android.okhttp.okio.RealBufferedSource.indexOf(RealBufferedSource.java:300)
    at com.android.okhttp.okio.RealBufferedSource.readUtf8LineStrict(RealBufferedSource.java:196)
    at com.android.okhttp.internal.http.Http1xStream.readResponse(Http1xStream.java:186)
    at com.android.okhttp.internal.http.Http1xStream.readResponseHeaders(Http1xStream.java:127)
    at com.android.okhttp.internal.http.HttpEngine.readNetworkResponse(HttpEngine.java:737)
    at com.android.okhttp.internal.http.HttpEngine.readResponse(HttpEngine.java:609)
    at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:471)
    at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:407)
    at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:538)
}

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i want to create a simple login app in android studio in that i want to fetch first time username and password from local database sqlite and after that when we log in then the imei number of device can store in database...then when we try to log in next time it will login through only that imei number