Friend: Adapter for ListView

package com.example.sqlitedemo03.adapter;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import com.example.sqlitedemo03.R;
import com.example.sqlitedemo03.model.Friend;
import java.util.List;
public class FriendAdapter extends BaseAdapter {
private final Context ctx;
private final List<Friend> ls;
public FriendAdapter(Context ctx, List<Friend> ls) {
this.ctx = ctx;
this.ls = ls;
}
@Override
public int getCount() {
return ls.size();
}
@Override
public Object getItem(int position) {
return ls.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
private static final class ViewHolder{
TextView tvName;
TextView tvPhone;
public ViewHolder(View view) {
this.tvName = view.findViewById(R.id.tv_name);
this.tvPhone = view.findViewById(R.id.tv_phone);
}
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = LayoutInflater.from(ctx)
.inflate(R.layout.item_list, parent, false); //please create layout for item in listview
holder = new ViewHolder(convertView);
convertView.setTag(holder);
}
else
holder = (ViewHolder) convertView.getTag();
Friend friend = ls.get(position);
holder.tvName.setText(friend.getName());
holder.tvPhone.setText(friend.getPhone());
return convertView;
}
}