Android

• OS Name: Microsoft Windows 10 Pro (64 bit OS)
• OS Version: 10.0.19042 Build 19042.906
• OS Experience: Windows Feature Experience Pack 120.2212.551.0
• Processor: AMD Phenom II X2 545 Processor, 3.00 GHz, 2 Cores (x64-based processor)
• Motherboard: ASUS M4A78LT-M-LE
• Motherboard Version: Rev X.0x
• RAM: 6.00 GB (5.75 GB usable)
• Hyper-V - VM Monitor Mode Extensions: Yes
• Hyper-V - Second Level Address Translation Extensions: Yes
• Hyper-V - Virtualization Enabled in Firmware: Yes
• Hyper-V - Data Execution Protection: Yes

Is it possible to write an application that takes the user coordinates and puts it in uber application

package com.ishidakorea.test02

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import java.lang.Exception

class MainActivity : AppCompatActivity(), A.interA, Child.interChild
{
    override fun Child_EventFire()
    {
        // Child Class Listener
    }
    override fun A_SendPost()
    {
        // AA Class Listener
    }

    override fun onCreate(savedInstanceState: Bundle?)
    {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        var A1 = A()

    }


}

class A : Child(), Child.interChild {

    interface interA
    {
        fun A_SendPost()
    }

    lateinit var LinstenerA : A.interA

    init {
        LinstenerA = this@A as A.interA // Exception
    }

    fun FireA()
    {
        if (LinstenerA != null)
            LinstenerA.A_SendPost()
    }
    
    override fun Child_EventFire()
    {

    }

    
}

open class Child {

    interface interChild
    {
        fun Child_EventFire()
    }

    lateinit var LinstenerB : interChild

    init {
            LinstenerB = this@Child as interChild // OK
    }

    fun Fire()
    {
        if (LinstenerB != null)
            LinstenerB.Child_EventFire()
    }



}

An error occurs while creating a new listener from a parent class that inherits a child class that has a listener.

Why is that?

If you know anyone, please advise.

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;