Question

这里有两个问题。按照教程，我需要一点帮助使其适应我的项目。 1）每组的孩子都是一样的。例如，Arraylist餐厅包含“Dining Commons”组的孩子们，我需要再制作两个包含学术建筑和住宅建筑的arraylists，并且需要成为他们各自父母的孩子。

2）是否可以使子项目可点击？使用clicklistener或类似的东西。

java source。

package com.bogotobogo.android.smplexpandable;

import android.app.ExpandableListActivity;
import android.os.Bundle;
import android.widget.ExpandableListAdapter;
import android.widget.SimpleExpandableListAdapter;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Demonstrates expandable lists backed by a Simple Map-based adapter
 */
public class SmplExpandable extends ExpandableListActivity {
    private static final String NAME = "NAME";
    private static final String IS_EVEN = "IS_EVEN";

    ArrayList buildings = BuildingList();
    ArrayList diningCommonBuildings = DiningList();

    private ExpandableListAdapter mAdapter;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        List<Map<String, String>> groupData = new ArrayList<Map<String, String>>();
        List<List<Map<String, String>>> childData = new ArrayList<List<Map<String, String>>>();
        for (int i = 0; i < buildings.size(); i++) {
            Map<String, String> curGroupMap = new HashMap<String, String>();
            groupData.add(curGroupMap);
            curGroupMap.put(NAME, (String) buildings.get(i));
            //curGroupMap.put(IS_EVEN, (i % 2 == 0) ? "This group is even" : "This group is odd");

            List<Map<String, String>> dining = new ArrayList<Map<String, String>>();

            for (int j = 0; j < diningCommonBuildings.size(); j++) {
                Map<String, String> curChildMap = new HashMap<String, String>();
                dining.add(curChildMap);
                curChildMap.put(NAME, (String) diningCommonBuildings.get(j));
                //curChildMap.put(IS_EVEN, (j % 2 == 0) ? "This child is even" : "This child is odd");
            }
            childData.add(dining);
        }

        // Set up our adapter
        mAdapter = new SimpleExpandableListAdapter(
                this,
                groupData,
                android.R.layout.simple_expandable_list_item_1,
                new String[] { NAME, IS_EVEN },
                new int[] { android.R.id.text1, android.R.id.text2 },
                childData,
                android.R.layout.simple_expandable_list_item_2,
                new String[] { NAME, IS_EVEN },
                new int[] { android.R.id.text1, android.R.id.text2 }
                );
        setListAdapter(mAdapter);
    }

    private ArrayList BuildingList() {

                ArrayList buildings = new ArrayList();
                buildings.add("Academic Buildings");
                buildings.add("Dining Commons");
                buildings.add("Residential Buildings");
                return buildings;
            }
    private ArrayList DiningList() {

        ArrayList dining = new ArrayList();
        dining.add("Berkshire");
        dining.add("Franklin");
        dining.add("Hampden");
        dining.add("Hampshire");
        dining.add("Worcester");
        return dining;
    }

}

Answer 1

看看这个例子，

public class MainExpand extends ExpandableListActivity {

    private ExpandableListAdapter adapter;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        List<Map<String, String>> parent = new ArrayList<Map<String,String>>();
        List<List<Map<String, String>>> childGroup = new ArrayList<List<Map<String,String>>>();

        for (int i = 0; i < 5; i++) {

            Map<String, String> parentMap = new HashMap<String, String>();
            parentMap.put("lalit", "Parent "+i);
            parent.add(parentMap);

            List<Map<String, String>> child = new ArrayList<Map<String,String>>();
            for (int j = 0; j < 2; j++) {

                Map<String, String> childMap = new HashMap<String, String>();
                childMap.put("lalit", "Child "+j);
                child.add(childMap);
            }
            childGroup.add(child);
        }

        adapter = new SimpleExpandableListAdapter(
                this,
                parent,android.R.layout.simple_expandable_list_item_1,new String[] {"lalit"},new int[] { android.R.id.text1, android.R.id.text2},
                childGroup,android.R.layout.simple_expandable_list_item_2,new String[]{"lalit","even"}, new int[]{android.R.id.text1,android.R.id.text2}
                );
        setListAdapter(adapter);
    }

Answer 2

我结合使用了你的两个答案。谢谢。我利用了多维数组。首先我创建了这些数组。

private String[] buildingTypes = {
             "Academic Buildings", "Dining Commons", "Residential Halls" };

private String[][] buildingList = {
             { "Agriculutural Engineering", "Army ROTC", "Arnold House", "Studio Arts Bldg","Bartlett" },
             { "Berkshire", "Franklin", "Hampden", "Hampshire", "Worcester" },
             { "Baker Hall", "Brett Hall", "Brooks Hall", "Brown Hall","Butterfield Hall" },

然后我修改了for循环

for (int i = 0; i < buildingTypes.length; i++) {

            Map<String, String> parentMap = new HashMap<String, String>();
            parentMap.put("lalit", buildingTypes[i]);
            parent.add(parentMap);

            List<Map<String, String>> child = new ArrayList<Map<String,String>>();
            for (int j = 0; j < rows; j++) {

                Map<String, String> childMap = new HashMap<String, String>();
                childMap.put("lalit", buildingList[i][j]);
                child.add(childMap);
            }
            childGroup.add(child);
        }

Answer 3

以下是您的两个问题的答案。如果有什么不合适，请在评论中告诉我。

第1部分答案：

请看这里：http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/view/ExpandableList1.html

    private String[][] children = {
            { "Academic1", "Academic2", "Academic3", "Academic4" },
            { "Dining1", "Dining2", "Dining2", "Dining3" },
            { "Residential1", "Residential2" },
    };

第2部分的答案）：

http://developer.android.com/reference/android/widget/ExpandableListView.OnChildClickListener.html

onChildClick（ExpandableListView parent，View v，int groupPosition，int childPosition，long id）子进程中要调用的回调方法此可扩展列表已被点击。

扩展名单为所有父母提供相同的子女

3 个答案: