Android Studio - getApplicationContext logcat error-CodePudding

When you press the button on the main screen, it goes to the animal hospital list screen I was compiling a list of veterinary hospitals with Recyclerview. (I have created intents on the main screen, but I have not yet created intents on the animal hospital list screen.)

All other codes have not failed, but the getApplicationContext() part will fail.

logcat: 'hospitalListAdapter(android.content.Context, java.util.ArrayList<com.example.project.hospitalListItem>)' in 'com.example.project.hospitalListAdapter' cannot be applied to '(android.content.Context)'

hospitalActivity.java (List of Animal Hospitals)

import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

public class hospitalActivity extends AppCompatActivity {


    RecyclerView hospital_list;
    hospitalListAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_hospital);

        hospital_list = findViewById(R.id.hospital_list);
        LinearLayoutManager layoutManager = new LinearLayoutManager(getApplicationContext(), LinearLayoutManager.VERTICAL, false);
        hospital_list.setLayoutManager(layoutManager);

        adapter = new hospitalListAdapter(getApplicationContext());
        hospital_list.setAdapter(adapter);

        adapter.addItem(new hospitalListItem(R.drawable.nuribom, "동물병원", "종로구","02-33", "어쩌구저쩌구"));
        adapter.addItem(new hospitalListItem(R.drawable.nuribom, "동물병원", "종로구","02-33", "어쩌구저쩌구"));
        adapter.addItem(new hospitalListItem(R.drawable.nuribom, "동물병원", "종로구","02-33", "어쩌구저쩌구"));
        adapter.addItem(new hospitalListItem(R.drawable.nuribom, "동물병원", "종로구","02-33", "어쩌구저쩌구"));
        adapter.addItem(new hospitalListItem(R.drawable.nuribom, "동물병원", "종로구","02-33", "어쩌구저쩌구"));
        adapter.addItem(new hospitalListItem(R.drawable.nuribom, "동물병원", "종로구","02-33", "어쩌구저쩌구"));
        adapter.addItem(new hospitalListItem(R.drawable.nuribom, "동물병원", "종로구","02-33", "어쩌구저쩌구"));
        adapter.addItem(new hospitalListItem(R.drawable.nuribom, "동물병원", "종로구","02-33", "어쩌구저쩌구"));
        adapter.addItem(new hospitalListItem(R.drawable.nuribom, "동물병원", "종로구","02-33", "어쩌구저쩌구"));
        adapter.addItem(new hospitalListItem(R.drawable.nuribom, "동물병원", "종로구","02-33", "어쩌구저쩌구"));
        adapter.addItem(new hospitalListItem(R.drawable.nuribom, "동물병원", "종로구","02-33", "어쩌구저쩌구"));
        adapter.addItem(new hospitalListItem(R.drawable.nuribom, "동물병원", "종로구","02-33", "어쩌구저쩌구"));

    }
}

hospitalListItem.java (ListItem)

public class hospitalListItem {
    int resId;
    String title;
    String address;
    String phone;
    String guri;

    public hospitalListItem(int resId, String title, String address, String phone, String guri) {
        this.resId = resId;
        this.title = title;
        this.address = address;
        this.phone = phone;
        this.guri = guri;
    }
}


hospitalListAdapter.java (ListAdapter)

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import java.util.ArrayList;

public class hospitalListAdapter extends RecyclerView.Adapter<hospitalListAdapter.ViewHolder> {
    Context mContext;
    ArrayList<hospitalListItem> items = new ArrayList<>();

    public hospitalListAdapter(Context mContext, ArrayList<hospitalListItem> items) {
        this.mContext = mContext;
        this.items = items;
    }

    @NonNull
    @Override
    public hospitalListAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View itemView = inflater.inflate(R.layout.hospital_design, parent, false);

        return new ViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(@NonNull hospitalListAdapter.ViewHolder holder, int position) {
        hospitalListItem item = items.get(position);
        holder.setItem(item);
    }

    @Override
    public int getItemCount() {
        return items.size();
    }

    public void addItem(hospitalListItem item){
        items.add(item);
    }

    static class ViewHolder extends RecyclerView.ViewHolder{
        ImageView listEdit_tv;
        TextView title_tv;
        TextView addr_tv;
        TextView phone_tv;
        TextView guri_tv;

        public ViewHolder(View itemView) {
            super(itemView);

            listEdit_tv = itemView.findViewById(R.id.listEdit_tv);
            title_tv = itemView.findViewById(R.id.title_tv);
            addr_tv = itemView.findViewById(R.id.addr_tv);
            phone_tv = itemView.findViewById(R.id.phone_tv);
            guri_tv = itemView.findViewById(R.id.guri_tv);
        }
        public void setItem(hospitalListItem item){
            listEdit_tv.setImageResource(item.resId);
            title_tv.setText(item.title);
            addr_tv.setText(item.address);
            phone_tv.setText(item.phone);
            guri_tv.setText(item.guri);
        }
    }
}

I need your help. I'd appreciate your help.

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CodePudding user response：

public hospitalListAdapter(Context mContext, ArrayList<hospitalListItem> items)

This is the constructor of your hospitalListAdapter Class. Whenever, you want to create objects of a class you need to call its constructor and pass the parameters. Here the constructor requires a Context and a ArrayList<>, so you need to pass both but you are only passing the context.

// also pass the list to the constructor here
adapter = new hospitalListAdapter(getApplicationContext());

Correct way:

// here I am creating an empty list and passing it to adapter as required.
ArrayList<hospitalListItem> list = new ArrayList<hospitalListItem>();
adapter = new hospitalListAdapter(getApplicationContext(), list);

Also, Instead of passing items one by one to your adapter you can first add them to your list and then pass the whole list itself, as shown above.

// passing items one by one to the list
adapter.addItem(new hospitalListItem(R.drawable.nuribom, "동물병원", "종로구","02-33", "어쩌구저쩌구"));

Do this instead.

// create a list
ArrayList<hospitalListItem> list = new ArrayList<hospitalListItem>();

// add items to the list
list.add(new hospitalListItem(R.drawable.nuribom, "동물병원", "종로구","02-33", "어쩌구저쩌구"));
list.add(new hospitalListItem(R.drawable.nuribom, "동물병원", "종로구","02-33", "어쩌구저쩌구"));

// add remaining items here

// Finally, pass the whole list to adapter at once.
adapter = new hospitalListAdapter(getApplicationContext(), list);