自定义BaseAdapter，适配任意数据和布局

最新推荐文章于 2021-05-25 15:18:12 发布

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#BaseAdapter #ListView

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在做一个记账的功能时，数据源是时间，用户和各项支出混合的一个类，最终需要的ListView效果是：以天为单位显示各项数据，支持下拉刷新和上拉加载，加载时也是以天为单位，

数据源和最终效果图如下

public class Consume {

	private int id;
	private String accountNum;// 电话
	private String consumeDate;// 时间
	private float consumeWear;// 衣
	private float consumeFood;// 食
	private float consumeLive;// 住
	private float consumeWalk;// 行
	private float consumeBase;// 衣食住行
	private float consumeEntertainment;// 娱乐
	private float consumeStudy;// 学习
	private float consumeActivity;// 应酬
	private float consumeOther;// 其他
}

布局有两个部分，即日期和每个具体的支出，如下

consume_group

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingLeft="3dp"
    android:paddingRight="3dp" >

    <TextView
        android:id="@+id/consume_date"
        android:layout_width="match_parent"
        android:layout_height="30dp"
        android:background="#9BCD9B"
        android:gravity="center"
        android:textColor="@color/gray"
        android:textSize="15sp"
        android:textStyle="bold" />

    <View
        android:layout_width="match_parent"
        android:layout_height="1dip"
        android:background="@drawable/list_divider"
        android:focusable="true"
        android:focusableInTouchMode="true" />

</LinearLayout>

consume_child

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#EDEDED"
    android:orientation="vertical"
    android:paddingLeft="3dp"
    android:paddingRight="3dp" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#EECBAD"
        android:orientation="horizontal"
        android:paddingBottom="5dp"
        android:paddingTop="5dp" >

        <TextView
            android:id="@+id/consume_name"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="4"
            android:gravity="center"
            android:textColor="#912CEE"
            android:textSize="20sp" />

        <TextView
            android:id="@+id/consume_info"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="3"
            android:gravity="center_vertical|right"
            android:textColor="#912CEE"
            android:textSize="17sp" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:hint="元"
            android:textSize="17sp" />
    </LinearLayout>

    <View
        android:layout_width="match_parent"
        android:layout_height="1dip"
        android:background="@drawable/list_divider"
        android:focusable="true"
        android:focusableInTouchMode="true" />

</LinearLayout>

先对数据源进行处理，方便在BaseAdapter中使用，包括3个类

MyConsumeChild ，是consume_child中数据源，

public class MyConsumeChild {
	private String name;//标题
	private String info;//数据

	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getInfo() {
		return info;
	}
	public void setInfo(String info) {
		this.info = info;
	}

}

MyConsume，是一天中所用的数据

package com.licry.lifepasskey.model;

import java.util.ArrayList;
import java.util.List;

public class MyConsume {
	private String table;//当天日期
	private List<MyConsumeChild> childList;//各项支出，List为了后续的变更，目前为8个
	private Consume mConsume;

	public MyConsume(Consume consume) {
		mConsume = consume;
	}

        //将consume解析成table和childList
	public String getTable() {
		return table;
	}

	public void setTable() {
		table = mConsume.getConsumeDate();
	}

	public List<MyConsumeChild> getList() {
		return childList;
	}

	// "衣", "食", "住", "行", "学习", "娱乐", "应酬", "其他"
	public void setList() {
		childList = new ArrayList<MyConsumeChild>();
		MyConsumeChild mMyConsumeChild0 = new MyConsumeChild();
		mMyConsumeChild0.setName("衣");
		mMyConsumeChild0.setInfo(String.valueOf(mConsume.getConsumeWear()));
		childList.add(mMyConsumeChild0);
		MyConsumeChild mMyConsumeChild1 = new MyConsumeChild();
		mMyConsumeChild1.setName("食");
		mMyConsumeChild1.setInfo(String.valueOf(mConsume.getConsumeFood()));
		childList.add(mMyConsumeChild1);
		MyConsumeChild mMyConsumeChild2 = new MyConsumeChild();
		mMyConsumeChild2.setName("住");
		mMyConsumeChild2.setInfo(String.valueOf(mConsume.getConsumeLive()));
		childList.add(mMyConsumeChild2);
		MyConsumeChild mMyConsumeChild3 = new MyConsumeChild();
		mMyConsumeChild3.setName("行");
		mMyConsumeChild3.setInfo(String.valueOf(mConsume.getConsumeWalk()));
		childList.add(mMyConsumeChild3);
		MyConsumeChild mMyConsumeChild4 = new MyConsumeChild();
		mMyConsumeChild4.setName("学习");
		mMyConsumeChild4.setInfo(String.valueOf(mConsume.getConsumeStudy()));
		childList.add(mMyConsumeChild4);
		MyConsumeChild mMyConsumeChild5 = new MyConsumeChild();
		mMyConsumeChild5.setName("娱乐");
		mMyConsumeChild5.setInfo(String.valueOf(mConsume
				.getConsumeEntertainment()));
		childList.add(mMyConsumeChild5);
		MyConsumeChild mMyConsumeChild6 = new MyConsumeChild();
		mMyConsumeChild6.setName("应酬");
		mMyConsumeChild6.setInfo(String.valueOf(mConsume.getConsumeActivity()));
		childList.add(mMyConsumeChild6);
		MyConsumeChild mMyConsumeChild7 = new MyConsumeChild();
		mMyConsumeChild7.setName("其他");
		mMyConsumeChild7.setInfo(String.valueOf(mConsume.getConsumeOther()));
		childList.add(mMyConsumeChild7);
	}

}

主要的数据和布局适配在BaseAdapter中实现，具体代码如下

package com.licry.lifepasskey.adapter;

import java.util.ArrayList;
import java.util.List;

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.licry.lifepasskey.R;
import com.licry.lifepasskey.model.Consume;
import com.licry.lifepasskey.model.MyConsume;
import com.licry.lifepasskey.model.MyConsumeChild;

public class ConsumeAdapter extends BaseAdapter {

	private List<MyConsume> mMyConsumeList;
	private Context mContext;

        //由数据库查得的数据是当前帐号下的所有信息，即List<Consume>,将其解析成List<MyConsume>
	 public ConsumeAdapter(List<Consume> consumeList, Context mContext) {

		 this.mContext = mContext;
 		mMyConsumeList = new ArrayList<MyConsume>();
		 for (int i = 0; i < consumeList.size(); i++) {
 			MyConsume mMyConsume = new MyConsume(consumeList.get(i));
			mMyConsume.setTable();
 			mMyConsume.setList();
			 mMyConsumeList.add(mMyConsume);
		 }
 	}

	@Override
	public int getCount() {
		// TODO Auto-generated method stub
		return mMyConsumeList.size() * 9;//每组有9项，再乘以list的个数，即所有个数
	}

	@Override
	public Object getItem(int position) {
		// TODO Auto-generated method stub
		int i = (int) position / 9;
		return mMyConsumeList.get(i);//得到每一组的的MyConsume
	}

	@Override
	public long getItemId(int position) {
		// TODO Auto-generated method stub
		return position;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		// TODO Auto-generated method stub
		MyConsume myConsume = (MyConsume) getItem(position);
		GroupViewHolder groupViewHolder = null;
		ChildViewHolder childViewHolder = null;
		int k = position % 9;//确定组数，分成日期和具体支出
		if (k == 0) {//填充日期数据
			if (convertView == null) {
				LayoutInflater mLayoutInflater = LayoutInflater.from(mContext);
				convertView = mLayoutInflater.inflate(R.layout.consume_group,
						null);
				groupViewHolder = new GroupViewHolder();
				groupViewHolder.data = (TextView) convertView
						.findViewById(R.id.consume_date);
				convertView.setTag(groupViewHolder);
			} else {
				groupViewHolder = (GroupViewHolder) convertView.getTag();
			}
			groupViewHolder.data.setText(myConsume.getTable());
		} else {//填充支出数据
			if (convertView == null) {
				LayoutInflater mLayoutInflater = LayoutInflater.from(mContext);
				convertView = mLayoutInflater.inflate(R.layout.consume_child,
						null);
				childViewHolder = new ChildViewHolder();
				childViewHolder.name = (TextView) convertView
						.findViewById(R.id.consume_name);
				childViewHolder.info = (TextView) convertView
						.findViewById(R.id.consume_info);
				convertView.setTag(childViewHolder);
			} else {
				childViewHolder = (ChildViewHolder) convertView.getTag();
			}
			MyConsumeChild myConsumeChild = myConsume.getList().get(k - 1);
			childViewHolder.name.setText(myConsumeChild.getName());
			childViewHolder.info.setText(myConsumeChild.getInfo());
		}

		return convertView;
	}

	class GroupViewHolder {
		TextView data;
	}

	class ChildViewHolder {
		TextView name;
		TextView info;
	}
}

最终在Activity中使用

mListView = (ListView) findViewById(R.id.list_view_consume);
mConsumeAdapter = new ConsumeAdapter(consumeList, this);
mListView.setAdapter(mConsumeAdapter);

总的来说在自定义ListView多思考数据和view的匹配关系，复杂的多拆解再匹配，虽然篇幅会多，但带来的是逻辑的清晰和高效。