android中与Adapter相关的控件----ExpandableListView

ExpandableListView(可折叠的列表)

一、ExpandableListView（可折叠的列表）和ListView有很多地方差不多的，使用也差不多，只是他们使用适配器不一样的,ExpandableListView使用的是ExpandableAdapter适配器，常用的有BaseExpandableAdapter和SimpleExpandableAdapter。常用的属性：

android：childDivider：指定各组内部子类表项之间分割线，图片不会完全显示，分割子列表项是一条直线。

android：childIndicator：显示在子列表旁边的Drawable对象，可以是一个图像

android：childIndicatorEnd：子列表项指示符的结束约束位置

android：childIndicatorLeft：子列表项指示符的左边约束位置

android：childIndicatorRight：子列表指示符的右边约束位置

android：childIndicatorStart：子列表指示符的开始约束位置

android：groupIndicator：显示在组列表旁边的Drawable对象，可以是一个图像

android：indicatorEnd：组列表项指示器的结束约束位置

android：indicatorLeft：组列表项指示器的左边约束位置

 二、使用例子

adapter：

package com.example.test3;


import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ImageView;
import android.widget.TextView;

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

/**
 * Created by coder-tu on 2016/1/18.
 */
public class MyExpandabedAdapter extends BaseExpandableListAdapter {
    private Context mContext;
    private List<String> parentData;
    private List<ArrayList<Item>> childData;

    public MyExpandabedAdapter(Context mContext, List<ArrayList<Item>> childData, List<String> parentData) {
        this.mContext = mContext;
        this.childData = childData;
        this.parentData = parentData;
    }

    @Override
    public int getGroupCount() {
        return parentData.size();
    }

    @Override
    public int getChildrenCount(int i) {
        return childData.get(i).size();
    }

    @Override
    public Object getGroup(int i) {
        return parentData.get(i);
    }

    @Override
    public Object getChild(int i, int i1) {
        return childData.get(i).get(i1);
    }

    @Override
    public long getGroupId(int i) {
        return i;
    }

    @Override
    public long getChildId(int i, int i1) {
        return i;
    }

    @Override
    public boolean hasStableIds() {
        return false;
    }

    @Override
    public View getGroupView(int i, boolean b, View view, ViewGroup viewGroup) {
        ViewHolder1 viewHolder1 = null;
        if (view  == null){
            viewHolder1 = new ViewHolder1();
            view = LayoutInflater.from(mContext).inflate(R.layout.parent,viewGroup,false);
            viewHolder1.textView1 = (TextView) view.findViewById(R.id.text1);
            view.setTag(viewHolder1);
        }else{
            viewHolder1 = (ViewHolder1) view.getTag();
        }
        viewHolder1.textView1.setText(parentData.get(i));
        return view;
    }

    @Override
    public View getChildView(int i, int i1, boolean b, View view, ViewGroup viewGroup) {
        ViewHolder2 viewHolder2 = null;
        if (view == null){
            viewHolder2 = new ViewHolder2();
            view = LayoutInflater.from(mContext).inflate(R.layout.item,viewGroup,false);
            viewHolder2.imageView2 = (ImageView) view.findViewById(R.id.image2);
            viewHolder2.textView2 = (TextView) view.findViewById(R.id.text2);
            view.setTag(viewHolder2);
        }
        else{
            viewHolder2 = (ViewHolder2) view.getTag();
        }
        viewHolder2.imageView2.setImageResource(childData.get(i).get(i1).getId());
        viewHolder2.textView2.setText(childData.get(i).get(i1).getContent());
        return view;
    }

    @Override
    public boolean isChildSelectable(int i, int i1) {
        return true;
    }
    class  ViewHolder1{
        public TextView textView1;
    }
    class  ViewHolder2{
        public ImageView imageView2;
        public TextView textView2;
    }
}

布局文件

Java文件

package com.example.test3;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ExpandableListView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;
public class MainActivity extends Activity{
    private ExpandableListView expandableListView;
    private List<String> parentData;
    private List<ArrayList<Item>> childData;
    private MyExpandabedAdapter adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        expandableListView = (ExpandableListView) findViewById(R.id.expandableListView);
        parentData = new ArrayList<>();
        parentData.add(new String("父母1"));
        parentData.add(new String("父母2"));
        parentData.add(new String("父母3"));
//        给父母1准备数据
        ArrayList<Item> arrayList1 = new ArrayList<>();
        arrayList1.add(new Item(R.mipmap.ic_launcher,"父母1--孩子1"));
        arrayList1.add(new Item(R.mipmap.ic_launcher,"父母1--孩子2"));
        arrayList1.add(new Item(R.mipmap.ic_launcher,"父母1--孩子3"));
//        给父母2准备数据
        ArrayList<Item> arrayList2 = new ArrayList<>();
        arrayList2.add(new Item(R.mipmap.ic_launcher,"父母2--孩子1"));
        arrayList2.add(new Item(R.mipmap.ic_launcher,"父母2--孩子2"));
        arrayList2.add(new Item(R.mipmap.ic_launcher,"父母2--孩子3"));
//        给父母3准备数据
        ArrayList<Item> arrayList3 = new ArrayList<>();
        arrayList3.add(new Item(R.mipmap.ic_launcher,"父母3--孩子1"));
        arrayList3.add(new Item(R.mipmap.ic_launcher,"父母3--孩子2"));
        arrayList3.add(new Item(R.mipmap.ic_launcher,"父母3--孩子3"));

        childData = new ArrayList<>();
        childData.add(arrayList1);
        childData.add(arrayList2);
        childData.add(arrayList3);
        adapter = new MyExpandabedAdapter(MainActivity.this,childData,parentData);
        expandableListView.setAdapter(adapter);
        expandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
            @Override
            public boolean onChildClick(ExpandableListView parent, View children, int parentPosition, int childPosition, long id) {
                Toast.makeText(MainActivity.this,"你好",Toast.LENGTH_LONG).show();
                return false;
            }
        });
    }
}

效果图：