ExpandableListView例子

最新推荐文章于 2023-05-13 11:19:20 发布

原创最新推荐文章于 2023-05-13 11:19:20 发布 · 112 阅读

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CC 4.0 BY-SA版权

本文详细介绍了ExpandableListView的实现原理、属性配置及如何通过SimpleExpandableListAdapter进行数据填充，包括创建数据模型、设置布局文件、监听事件等关键步骤，并通过实例展示了如何动态更新数据。

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效果图

ExpandablelistviewActivity.java

package com.expandlistview2;

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

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ExpandableListView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.SimpleExpandableListAdapter;

public class Expandlistview2Activity extends Activity {
	ExpandableListView act;
	List<Map<String,String>> groups;
	List<List<Map<String,String>>> childs;
	SimpleExpandableListAdapter sla;
	/** Called when the activity is first created. */  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
          
        act = (ExpandableListView)findViewById(R.id.expandlist);
        groups = new ArrayList<Map<String,String>>();  
        Map<String,String> group1 = new HashMap<String,String>();  
        group1.put("group", "group1");  
        Map<String,String> group2 = new HashMap<String,String>();  
        group2.put("group", "group2");  
        groups.add(group1);  
        groups.add(group2);  
          
        List<Map<String,String>> child1 = new ArrayList<Map<String,String>>();  
        Map<String,String> childData1 = new HashMap<String, String>();  
        childData1.put("child", "child1Data1");  
        Map<String,String> childData2 = new HashMap<String, String>();  
        childData2.put("child", "child1Data2");  
        child1.add(childData1);  
        child1.add(childData2);  
          
        List<Map<String,String>> child2 = new ArrayList<Map<String,String>>();  
        Map<String,String> child2Data1 = new HashMap<String, String>();  
        child2Data1.put("child", "child2Data1");  
        Map<String,String> child2Data2 = new HashMap<String, String>();  
        child2Data2.put("child", "child2Data2");  
        child2.add(child2Data1);  
        child2.add(child2Data2);  
          
        childs = new ArrayList<List<Map<String,String>>>();  
        childs.add(child1);  
        childs.add(child2);  
        //生成对象  
        //1.context  
        //2.一级条目数据  
        //3.用来设置一级条目样式的布局文件  
        //4.指定一级条目数据的Key  
        //5.指定一级条目数据显示的group控件id  
        //6.指定二级条目数据  
        //7.用来设置二级条目样式的布局文件  
        //8.指定二级条目数据的key  
        //9.指定二级条目数据显示的控件的id  
        sla = new SimpleExpandableListAdapter  
                (this, groups, R.layout.group, new String[]{"group"}, new int[]{R.id.groupId},   
                        childs, R.layout.child, new String[]{"child"}, new int[]{R.id.childId});  
        act.setAdapter(sla);  
        System.out.println("act.getChildCount():"+act.getCount());;
        for (int i = 0; i < sla.getGroupCount(); i++) {
        	System.out.println("i:"+i);
			act.expandGroup(i);
		}
        //设置为null则去掉箭头
//        act.setGroupIndicator(null);
        //子节点的监听事件
        act.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
            public boolean onChildClick(ExpandableListView expandableListView, View view, int i, int i1, long l) {
            	System.out.println("i:"+i+"   i1:"+i1+"   l:"+l);
                HashMap m = (HashMap) sla.getChild(i, i1);
                System.out.println("m:"+m);
//                String albumid = (String) m.get(NAME);
//                Toast.makeText(Main.this, albumid, Toast.LENGTH_SHORT).show();
                return false;  //todo
            }
        });
        //父节点的监听事件
        act.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
			@Override
			public boolean onGroupClick(ExpandableListView parent, View v,
					int groupPosition, long id) {
				System.out.println("v:"+v);
				return false;
			}
		});
    }  
    public void expandClick(View v){
    	Map<String,String> group1 = new HashMap<String,String>();  
        group1.put("group", "group3");
        groups.add(group1);  
        List<Map<String,String>> child1 = new ArrayList<Map<String,String>>();  
        Map<String,String> childData1 = new HashMap<String, String>();  
        childData1.put("child", "child3Data1");  
        Map<String,String> childData2 = new HashMap<String, String>();  
        childData2.put("child", "child3Data2");  
        child1.add(childData1);  
        child1.add(childData2);  
        childs.add(child1);  
        
        Map<String,String> childData = new HashMap<String, String>();  
        childData.put("child", "child1Data22");  
        childs.get(1).add(childData);
        sla.notifyDataSetChanged();
        System.out.println("===:"+sla.getGroupCount());
    }
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical" android:layout_width="fill_parent"
	android:layout_height="fill_parent">
	<TextView android:layout_width="fill_parent"
		android:layout_height="wrap_content" android:text="@string/hello" />
	<ExpandableListView android:id="@id/android:list"
		android:layout_height="fill_parent" android:layout_width="fill_parent" android:drawSelectorOnTop="false" ></ExpandableListView>
</LinearLayout>

group.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical" android:layout_width="fill_parent"
	android:layout_height="fill_parent">
	<TextView android:layout_height="50px" android:layout_width="fill_parent"
		android:id="@+id/groupId" android:paddingLeft="50dip" android:text="TextView"
		android:gravity="fill_vertical"></TextView>

</LinearLayout>

child.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical" android:layout_width="match_parent"
	android:layout_height="match_parent">
	<TextView android:layout_height="wrap_content"
		android:layout_width="match_parent" android:id="@+id/childId"
		android:paddingLeft="80px" android:paddingTop="5px"
		android:paddingBottom="5px" android:text="TextView"></TextView>

</LinearLayout>

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