【Android】ExpandableListView简单的使用方法

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >

    <ExpandableListView
        android:id="@+id/expandableListView1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        >

    </ExpandableListView>

</RelativeLayout>

MainActivity.java

package com.example.expandablelistview;

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

import android.os.Bundle;
import android.app.Activity;
import android.view.Gravity;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.Toast;
import android.widget.ExpandableListView.OnGroupClickListener;
import android.widget.TextView;

public class MainActivity extends Activity {
    ExpandableListView expandableListView;
    private List<String> GroupData;//定義組數據    
    private List<List<String>> ChildrenData;//定義組中的子數據  
    private void LoadListDate() {    
        GroupData = new ArrayList<String>();    
        GroupData.add("國家");    
        GroupData.add("人物");    
        GroupData.add("武器");    
    
        ChildrenData = new ArrayList<List<String>>();    
        List<String> Child1 = new ArrayList<String>();    
        Child1.add("蜀國");    
        Child1.add("魏國");  
        Child1.add("吳國");  
        ChildrenData.add(Child1);    
        List<String> Child2 = new ArrayList<String>();    
        Child2.add("關羽");    
        Child2.add("張飛");    
        Child2.add("典韋");    
        Child2.add("呂布");  
        Child2.add("曹操");  
        Child2.add("甘寧");  
        Child2.add("郭嘉");  
        Child2.add("周瑜");  
        ChildrenData.add(Child2);    
        List<String> Child3 = new ArrayList<String>();    
        Child3.add("青龍偃月刀");    
        Child3.add("丈八蛇矛槍");    
        Child3.add("青鋼劍");    
        Child3.add("麒麟弓");    
        Child3.add("銀月槍");    
        ChildrenData.add(Child3);    
    }    
    boolean  flags;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        LoadListDate();    
        expandableListView=(ExpandableListView) findViewById(R.id.expandableListView1);
        expandableListView.setAdapter(new ExpandableAdapter()); 
       // ExpandableListView 默认展开
        for(int i = 0; i < 3; i++){            
               expandableListView.expandGroup(i);                                    
            }
        //去掉ExpandableListView默认的箭头 
        expandableListView.setGroupIndicator(null);
 　　　　//flags=false;
        //ExpandableListView点击Group不收缩，群组点击事件屏蔽
        expandableListView.setOnGroupClickListener(new OnGroupClickListener() {           
            @Override
            public boolean onGroupClick(ExpandableListView parent, View v,
                    int groupPosition, long id) {

　　　　　　　　　　//if (flags==true) {
　　　　　　　　　　//　　expandableListView.expandGroup(groupPosition);
　　　　　　　　　　//　　flags=false;
　　　　　　　　　　//}else {
　　　　　　　　　　//　　expandableListView.collapseGroup(groupPosition);
　　　　　　　　　　//　　flags=true;
　　　　　　　　　　//}

                Toast.makeText(MainActivity.this, "群组："+groupPosition, Toast.LENGTH_SHORT).show();
                return true;
            }
        });
        //ExpandableListView点击Child提醒
        expandableListView.setOnChildClickListener(new OnChildClickListener() {
            @Override
            public boolean onChildClick(ExpandableListView parent, View v,
                    int groupPosition, int childPosition, long id) {
                Toast.makeText(MainActivity.this, "群组："+groupPosition+"
"+"小节："+childPosition, Toast.LENGTH_SHORT).show();
                return true;
                
            }
        });
    }

    private class ExpandableAdapter extends BaseExpandableListAdapter {    
        @Override  
        public Object getChild(int groupPosition, int childPosition) {  
            return ChildrenData.get(groupPosition).get(childPosition);  
        }  
  
        @Override  
        public long getChildId(int groupPosition, int childPosition) {  
            return 0;  
        }  
  
        @Override  
        public View getChildView(int groupPosition, int childPosition,  
                boolean isLastChild, View convertView, ViewGroup parent) {  
            TextView myText = null;    
            if (convertView != null) {    
                myText = (TextView)convertView;    
                myText.setText(ChildrenData.get(groupPosition).get(childPosition)); 
                
            } else {    
                myText = createView(ChildrenData.get(groupPosition).get(childPosition));    
                
            }    
            return myText;    
        }  
  
        @Override  
        public int getChildrenCount(int groupPosition) {  
            return ChildrenData.get(groupPosition).size();  
        }  
  
        @Override  
        public Object getGroup(int groupPosition) {  
            return GroupData.get(groupPosition);  
        }  
  
        public int getGroupCount() {  
            return GroupData.size();  
        }  
  
        @Override  
        public long getGroupId(int groupPosition) {  
            return 0;  
        }  
  
        @Override  
        public View getGroupView(int groupPosition, boolean isExpanded,  
                View convertView, ViewGroup parent) {  
            TextView myText = null;    
            if (convertView != null) {    
                myText = (TextView)convertView;    
                myText.setText(GroupData.get(groupPosition)); 
                //设置GroupView内容居中和颜色
                myText.setGravity(Gravity.CENTER);
                myText.setBackgroundColor(android.graphics.Color.GRAY);
            } else {    
                myText = createView(GroupData.get(groupPosition)); 
                //设置GroupView内容居中和颜色
                myText.setGravity(Gravity.CENTER);
                myText.setBackgroundColor(android.graphics.Color.GRAY);
            }    
            return myText;  
        }  
  
        @Override  
        public boolean hasStableIds() {  
            return false;  
        }  
  
        @Override  
        public boolean isChildSelectable(int groupPosition, int childPosition) {  
            //设置小节可被点击
            return true;  
        }    
        private TextView createView(String content) {    
            AbsListView.LayoutParams layoutParams = new AbsListView.LayoutParams(      
                    ViewGroup.LayoutParams.FILL_PARENT, 80);      
            TextView myText = new TextView(MainActivity.this);      
            myText.setLayoutParams(layoutParams);      
            myText.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);      
            myText.setPadding(80, 0, 0, 0);      
            myText.setText(content);    
            return myText;    
        }  
    }    
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    
}

 下面介绍如何从ExpandableListView中取值:

  //ExpandableListView点击Child提醒
        expandableListView.setOnChildClickListener(new OnChildClickListener() {
            @Override
            public boolean onChildClick(ExpandableListView parent, View v,
                    int groupPosition, int childPosition, long id) {
                Toast.makeText(NameListActivity.this, ChildrenData.get(groupPosition).get(childPosition)+"
"+GroupData.get(groupPosition), Toast.LENGTH_SHORT).show();
                return true;
                
            }
        });