Android开发：理解TextView.setText(int)与数值显示

public class Contact {
    public int sno;
    public String phone;
    public String name;

    public Contact(int sno, String phone, String name) {
        this.sno = sno;
        this.phone = phone;
        this.name = name;
    }
}

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.ViewHolder> {
    private final Contact[] localDataSet;

    /**
     * Provide a reference to the type of views that you are using
     * (custom ViewHolder).
     */
    public static class ViewHolder extends RecyclerView.ViewHolder {
        private final TextView snoTextView; // 假设有一个TextView用于显示sno
        private final TextView nameTextView;
        private final TextView phoneTextView;

        public ViewHolder(View view) {
            super(view);
            // Define click listener for the ViewHolder's View
            snoTextView = view.findViewById(R.id.sno_text_view); // 替换为你的TextView ID
            nameTextView = view.findViewById(R.id.textView2); // 假设对应name
            phoneTextView = view.findViewById(R.id.textView3); // 假设对应phone
        }

        public TextView getSnoTextView() {
            return snoTextView;
        }

        public TextView getNameTextView() {
            return nameTextView;
        }

        public TextView getPhoneTextView() {
            return phoneTextView;
        }
    }

    /**
     * Initialize the dataset of the Adapter.
     */
    public CustomAdapter(Contact[] dataSet) {
        localDataSet = dataSet;
    }

    // Create new views (invoked by the layout manager)
    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int viewType) {
        // Create a new view, which defines the UI of the list item
        View view = LayoutInflater.from(viewGroup.getContext())
                .inflate(R.layout.contact_layout, viewGroup, false); // 替换为你的布局文件
        return new ViewHolder(view);
    }

    // Replace the contents of a view (invoked by the layout manager)
    @Override
    public void onBindViewHolder(@NonNull ViewHolder viewHolder, final int position) {
        // Get element from your dataset at this position and replace the
        // contents of the view with that element
        Contact contact = localDataSet[position];

        // 错误的做法（会导致崩溃）：
        // viewHolder.getSnoTextView().setText(contact.sno);

        // 正确的做法：将int转换为String
        viewHolder.getSnoTextView().setText(String.valueOf(contact.sno));
        // 或者使用 Integer.toString()
        // viewHolder.getSnoTextView().setText(Integer.toString(contact.sno));

        viewHolder.getNameTextView().setText(contact.name);
        viewHolder.getPhoneTextView().setText(contact.phone);
    }

    @Override
    public int getItemCount() {
        return localDataSet.length;
    }
}