2.19简易记账本三

.写完listView之后最重要的就是为它添加适配器，这样它才能把获取的数据按照格式显示在主界面中

 命名为ListAdapter这里采用的是BaseAdapter

package com.example.myaccountapp;

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

import java.util.List;

public class ListAdapter extends BaseAdapter {
    List<costList> mList;

    public ListAdapter(List<costList>list)
    {
        mList=list;
    }

    @Override
    public int getCount() {
        return mList.size();
    }

    @Override
    public Object getItem(int position) {
        return mList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
       View view=mLayoutInflater.inflate(R.layout.list_item,null);
       //取出数据赋值
        costList item=mList.get(position);
        TextView tv_title=view.findViewById(R.id.tv_title);
        TextView tv_date=view.findViewById(R.id.tv_date);
        TextView tv_money=view.findViewById(R.id.tv_money);
        //绑定
        tv_title.setText(mList.get(position).getTitle());
        tv_date.setText(mList.get(position).getDate());
        tv_money.setText(mList.get(position).getMoney());
        return view;

    }

    private List<costList>getmList;
    private LayoutInflater mLayoutInflater;

    public ListAdapter(Context context,List<costList>list)
    {
        mList=list;
        //通过外部传来的Context初始化LayoutInflater对象
        mLayoutInflater=LayoutInflater.from(context);
    }
}