寒假打卡day24

今天做了什么

教程第四天

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
新建类：

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);
}
}