android之ExpandableListView

Posted 2020-09-12 丨丿丶

最近在做企业难忘录，得使用ExpandableListView，现在已做好了。

这需要两个布局，如下

第一个tt_item_group_parent.xml，如果想设置父或子组件的高度，最好是在这两个界面里面设置，在其它设置都没有怎么变化，如果有人解决的话，说出来分享一下吧

 

<?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:gravity="center_vertical"
    android:orientation="horizontal"
    android:background="#ffffff"
    android:padding="10dp">

    <TextView
        android:id="@+id/tt_item_group_parent_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="30dip"
        android:textColor="@color/Black"
        android:textSize="17sp" />

    <TextView
        android:id="@+id/tt_item_group_parent_id"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:visibility="gone" />

</LinearLayout>

第二个tt_item_group_child.xml

 

 

<?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="horizontal">

    <com.chat.ui.widget.ImageViewCircle
        android:id="@+id/tt_item_group_child_icon"
        android:layout_width="45dp"
        android:layout_height="45dp"
        android:layout_marginRight="10dp"
        android:scaleType="centerCrop" />

    <TextView
        android:id="@+id/tt_item_group_child_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:textColor="@color/Black"
        android:textSize="20sp" />

    <TextView
        android:id="@+id/tt_item_group_child_id"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:visibility="gone" />

</LinearLayout>

现在开始写容器了GroupAdapter.java

 

 

package com.chat.ui.adapter;

import java.util.List;

import com.chat.service.aidl.Contact;
import com.chat.service.aidl.GroupInfo;
import com.chat.ui.widget.ImageViewCircle;

import com.chat.IM;
import com.chat.R;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;

public class GroupAdapter extends BaseExpandableListAdapter{
	private List<GroupInfo> groupList;
	private List<Contact> contactList;
	private LayoutInflater mLayoutInflater = null;

	public GroupAdapter(Context ctx,List<GroupInfo> groupList){
		this.groupList = groupList;
		mLayoutInflater = (LayoutInflater) ctx
				.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
	}

	//获取指定组列表、指定子列表处的子列表数据
	@Override
	public Object getChild(int groupPos, int childPos) {
		contactList = groupList.get(groupPos).getContactList();
		return contactList.get(childPos);
	}

	@Override
	public long getChildId(int grounpPos, int childPos) {
		return childPos;
	}

	//返回特定组处的子列表数量
	@Override
	public int getChildrenCount(int groupPos) {
		contactList = groupList.get(groupPos).getContactList();
		return contactList.size();
	}

	//该方法决定每个子选项的外观
	@Override
	public View getChildView(int groupPos, int childPos, boolean isLastChild, View convertView,
			ViewGroup parent) {
		ChildHolder holder = null;
		if(convertView == null ){
			convertView = mLayoutInflater.inflate(R.layout.tt_item_group_child, null);
			holder = new ChildHolder(convertView);
			convertView.setTag(holder);
		}else{
			holder = (ChildHolder)convertView.getTag();
		}

		Contact contact = (Contact)getChild(groupPos,childPos);
		holder.name.setText(contact.name);
		holder.icon.setImageDrawable(IM.getAvatar(contact.account));  
		return convertView;
	}

	//获取指定组位置处的数据
	@Override
	public GroupInfo getGroup(int groupPos) {
		return groupList.get(groupPos);
	}

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

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

	@Override
	public View getGroupView(int groupPos, boolean isExpanded, View convertView, ViewGroup parent) {
		GroupHolder holder = null;
		if(convertView == null){
			convertView = mLayoutInflater.inflate(R.layout.tt_item_group_parent, null);
			holder = new GroupHolder(convertView);
			convertView.setTag(holder);
		}else{
			holder = (GroupHolder)convertView.getTag();
		}

		GroupInfo info = (GroupInfo)getGroup(groupPos);
		System.out.println("GroupAdapter->getGroupView:"+info.getName());
		holder.name.setText(groupList.get(groupPos).getName());
		return convertView;
	}

	// 是否指定分组视图及其子视图的ID对应的后台数据改变也会保持该ID。 
	@Override
	public boolean hasStableIds() {
		return true;
	}

	// 指定位置的子视图是否可选择。  
	@Override
	public boolean isChildSelectable(int groupPos, int childPos) {
		return true;
	}

	class ChildHolder{
		ImageViewCircle icon;
		TextView name;
		TextView accout;

		public ChildHolder(View v){
			icon = (ImageViewCircle)v.findViewById(R.id.tt_item_group_child_icon);
			name = (TextView)v.findViewById(R.id.tt_item_group_child_name);
			accout = (TextView)v.findViewById(R.id.tt_item_group_child_id);
		}
	}

	class GroupHolder{
		TextView name;
		TextView accout;

		public GroupHolder(View v){
			name = (TextView)v.findViewById(R.id.tt_item_group_parent_name);
			accout = (TextView)v.findViewById(R.id.tt_item_group_parent_id);
		}
	}
}

容器也写好，当然是写数据加载了Activity

 

 

public class AddFriActivity extends Activity {
	private ExpandableListView list;
	private GroupAdapter adapter;
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.tt_group);
		list = (ExpandableListView)curView.findViewById(R.id.tt_fragment_group_list);
		init();
	}
	private void initData(){
		List<GroupInfo> groupList = new ArrayList<GroupInfo>();
		List<Contact> contactList = null;
		GroupInfo groupInfo = null;
		Contact contact = null;

		contactList = new ArrayList<Contact>();
		contact = new Contact();
		contact.account = "小明";
		contact.name = "小明";
		contactList.add(contact);
		contact = new Contact();
		contact.account = "小红";
		contact.name = "小红";
		contactList.add(contact);

		groupInfo = new GroupInfo();
		groupInfo.setName("开发部");
		groupInfo.setContactList(contactList);

		groupList.add(groupInfo);
		//**********************

		contactList = new ArrayList<Contact>();
		contact = new Contact();
		contact.account = "大明";
		contact.name = "大明";
		contactList.add(contact);
		contact = new Contact();
		contact.account = "大红";
		contact.name = "大红";
		contactList.add(contact);

		groupInfo = new GroupInfo();
		groupInfo.setName("销售部");
		groupInfo.setContactList(contactList);

		groupList.add(groupInfo);
		//**********************

		contactList = new ArrayList<Contact>();
		contact = new Contact();
		contact.account = "中明";
		contact.name = "中明";
		contactList.add(contact);

		groupInfo = new GroupInfo();
		groupInfo.setName("财务部");
		groupInfo.setContactList(contactList);

		groupList.add(groupInfo);
		//**********************
		for(int i=0;i<groupList.size();i++){
			System.out.println(groupList.get(i).getName());
			for(int j=0;j<groupList.get(i).getContactList().size();j++){
				System.out.println(" "+groupList.get(i).getContactList().get(j).name);
			}
		}
		adapter = new GroupAdapter(getActivity(),groupList);
		list.setAdapter(adapter);
	}
}

记得有两个辅助类写一下

class GroupInfo {
	private String name;
	private List<Contact> contactList;
	
	public List<Contact> getContactList() {
		return contactList;
	}

	public void setContactList(List<Contact> contactList) {
		this.contactList = contactList;
	}

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


class Contact{
	public String account , name;
	
	public Contact(){}

	public String getAccount () {
		return account ;
	}

	public void setAccount(String account) {
		this.account = account ;
	}

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

最后写Activity里面的布局

 

 

<!--      android:cacheColorHint="#00000000"，这个设置可以去除拖动view时背景变成黑色的效果 
		     android:listSelector="#00000000" ，可以去除选中时的黄色底色 -->
    <ExpandableListView
        android:id="@+id/tt_fragment_group_list"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:padding="5dip"
        android:cacheColorHint="@android:color/transparent"
        android:background="#ffffff"
        android:listSelector="@android:color/transparent"
        android:groupIndicator="@drawable/tt_drop_select"
        android:divider="@drawable/tt_divide_line"
        android:childDivider="@drawable/tt_divide_line"
        />

 

差点忘记了点击时的效果，看下面来了

 

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
   
    <item 
        android:drawable="@drawable/tt_drop_up" 
        android:state_expanded="false"
        android:drawingCacheQuality="auto"/>
    
    <item 
        android:drawable="@drawable/tt_drop_down" 
        android:state_expanded="true"
        android:drawingCacheQuality="auto"/>

</selector>

图标在下面，想用的话直接下载吧，图标有点不对称，我不会p图，随便下的
连图标都上传了

 

 

终于写好了，怎么感觉像王大妈的臭脚，又臭 又长了，可能是我在做的过程中很多细节都遇到困难，所以才写出来，希望别人做的时候不会再遇到了 
现在看看效果吧