android自带的控件expandablelistview实现了分组列表功能，本案例在此基础上进行优化，为此控件添加增删改分组及子项的功能，以及列表数据的持久化。
demo实现效果：
grouplistdemo具体实现：
①demo中将列表页面设计为fragment页面，方便后期调用；在主界面mainactivity中动态添加grouplistfragment页面；
mainactivity.java
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package com.eric.grouplistdemo;
import android.app.activity;
import android.app.fragment;
import android.app.fragmentmanager;
import android.os.bundle;
import android.widget.relativelayout;
public class mainactivity extends activity {
public static grouplistfragment fragment;
@override
protected void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.activity_main);
fragment = new grouplistfragment();
getfragmentmanager().begintransaction()
.replace(r.id.fragcontainer, fragment).commit();
}
}
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动态添加grouplistfragment实例到界面的fragcontainer布局中；将fragment声明为static用于在adapter中组添加子项时进行调用。
activity_main.xml
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<?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="vertical" >
<relativelayout
android:id="@+id/fragcontainer"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
</relativelayout>
</linearlayout>
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②实现自定义适配器类myadapter，继承自baseexpandablelistadapter；组项布局及子项布局；
list_item_parent.xml组项布局文件，展开图标及名称，增删图标；
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<?xml version="1.0" encoding="utf-8"?>
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#0099ff"
android:orientation="horizontal">
<imageview
android:id="@+id/image_parent"
android:layout_width="50dp"
android:layout_height="50dp"
android:src="@drawable/image_parent1"/>
<textview
android:id="@+id/text_parent"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:textcolor="#fff"
android:textsize="20sp"
android:text="parent1"
android:layout_torightof="@id/image_parent"
android:gravity="center"/>
<imageview
android:id="@+id/image_delete"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_centervertical="true"
android:layout_alignparentright="true"
android:src="@drawable/delete"/>
<imageview
android:id="@+id/image_add"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_centervertical="true"
android:layout_toleftof="@id/image_delete"
android:src="@drawable/add"/>
</relativelayout>
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list_item_child.xml子项布局文件，名称及删除图标；
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<?xml version="1.0" encoding="utf-8"?>
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="40dp"
>
<textview
android:id="@+id/text_child"
android:layout_width="wrap_content"
android:layout_height="40dp"
android:layout_margin="5dp"
android:textcolor="#0099ff"
android:text="child"
android:layout_centerinparent="true"
android:gravity="center"/>
<imageview
android:id="@+id/image_delete"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_alignparentright="true"
android:layout_centervertical="true"
android:src="@drawable/delete"/>
</relativelayout>
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myadapter.java自定义适配器
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package com.eric.grouplistdemo;
import java.util.list;
import java.util.map;
import android.content.context;
import android.util.log;
import android.view.layoutinflater;
import android.view.view;
import android.view.view.onclicklistener;
import android.view.viewgroup;
import android.widget.baseexpandablelistadapter;
import android.widget.edittext;
import android.widget.imageview;
import android.widget.textview;
public class myadapter extends baseexpandablelistadapter{
private list<string> parentlist;
private map<string,list<string>> map;
private context context;
private edittext edit_modify;
private modifydialog dialog;
//构造函数
public myadapter(context context, list<string> parentlist, map<string,list<string>> map) {
this.context = context;
this.parentlist = parentlist;
this.map = map;
}
//获取分组数
@override
public int getgroupcount() {
return parentlist.size();
}
//获取当前组的子项数
@override
public int getchildrencount(int groupposition) {
string groupname = parentlist.get(groupposition);
int childcount = map.get(groupname).size();
return childcount;
}
//获取当前组对象
@override
public object getgroup(int groupposition) {
string groupname = parentlist.get(groupposition);
return groupname;
}
//获取当前子项对象
@override
public object getchild(int groupposition, int childposition) {
string groupname = parentlist.get(groupposition);
string chidlname = map.get(groupname).get(childposition);
return chidlname;
}
//获取组id
@override
public long getgroupid(int groupposition) {
return groupposition;
}
//获取子项id
@override
public long getchildid(int groupposition, int childposition) {
return childposition;
}
@override
public boolean hasstableids() {
return true;
}
//组视图初始化
@override
public view getgroupview(int groupposition, boolean isexpanded,
view convertview, viewgroup parent) {
final int grouppos = groupposition;
if(convertview == null){
convertview = layoutinflater.from(context).inflate(r.layout.list_item_parent, null);
}
imageview image = (imageview) convertview.findviewbyid(r.id.image_parent);
imageview image_add = (imageview) convertview.findviewbyid(r.id.image_add);
imageview image_delete = (imageview) convertview.findviewbyid(r.id.image_delete);
if(isexpanded){
image.setimageresource(r.drawable.image_parent2);
}else{
image.setimageresource(r.drawable.image_parent1);
}
image_add.setonclicklistener(new onclicklistener() {
@override
public void onclick(view v) {
alertadddialog(mainactivity.fragment.getactivity(), "新增子项", grouppos);
}
});
image_delete.setonclicklistener(new onclicklistener() {
@override
public void onclick(view v) {
grouplistfragment.deletegroup(grouppos);
}
});
textview parenttext = (textview) convertview.findviewbyid(r.id.text_parent);
parenttext.settext(parentlist.get(groupposition));
return convertview;
}
//子项视图初始化
@override
public view getchildview(int groupposition, int childposition,
boolean islastchild, view convertview, viewgroup parent) {
final int grouppos = groupposition;
final int childpos = childposition;
if(convertview == null){
convertview = layoutinflater.from(context).inflate(r.layout.list_item_child, null);
}
textview childtext = (textview) convertview.findviewbyid(r.id.text_child);
imageview image_delete = (imageview) convertview.findviewbyid(r.id.image_delete);
string parentname = parentlist.get(groupposition);
string childname = map.get(parentname).get(childposition);
childtext.settext(childname);
image_delete.setonclicklistener(new onclicklistener() {
@override
public void onclick(view v) {
grouplistfragment.deletechild(grouppos, childpos);
}
});
return convertview;
}
@override
public boolean ischildselectable(int groupposition, int childposition) {
return true;
}
//弹新增子项对话框
public void alertadddialog(context context, string title, int currentgroup){
final int group = currentgroup;
dialog = new modifydialog(context, title, null);
edit_modify = dialog.getedittext();
dialog.setonclickcommitlistener(new onclicklistener() {
@override
public void onclick(view v) {
grouplistfragment.addchild(group, edit_modify.gettext().tostring());
dialog.dismiss();
}
});
dialog.show();
}
}
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构造函数：将传入的parentlist和map进行数据同步，parentlist保存组数据，map保存对应组及其子项list数据；
获取分组数及子项数等很简单，就不介绍了，主要讲述一下，组视图初始化和子项视图初始化这两个函数；
组视图初始化getgroupview()：尽量复用convertview防止内存泄露，首先是进行判断，若convertview为空，则进行组视图初始化，加载list_item_parent子项布局；获取到相应的组布局控件：展开图标image、添加图标image_add、删除图标image_delete；通过传递过来的布尔类型参数isexpanded，进行判断给image赋值展开图标或合并图标；分别给添加图标和删除图标添加点击事件，分别调用grouplistfragment中的弹出添加窗口函数alertadddialog()和删除组函数deletegroup()；
子项视图初始化getchildview()：同样尽量复用convertview防止内存泄露，首先是进行判断，若convertview为空，则进行子项视图初始化，加载list_item_child子项布局；获取到相应的子布局控件：内容文本childtext和删除图标image_delete；从parentlist和map中分别获取到，当前子项的组名parentname和子项名childname，赋值childtext，删除图标添加点击事件，调用删除子项函数deletechild()；
③实现自定义对话框类modifydialog，继承自dialog类，对输入修改内容，或新增项内容进行过渡；
no_title_dialog.xml，在values目录下自定义dialog的style类型xml，除去dialog的标题栏；
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<?xml version="1.0" encoding="utf-8"?>
<resources xmlns:android="http://schemas.android.com/apk/res/android">
<style name="notitledialog" parent="android:style/theme.dialog">
<item name="android:width">300dp</item>
<item name="android:height">40dp</item>
<item name="android:windownotitle">true</item>
</style>
</resources>
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dialog_modify.xml 自定义对话框的布局文件，标题文本，输入框，确定按钮；
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<?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="vertical" >
<textview
android:id="@+id/text_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:gravity="center"
android:background="#0099ff"
android:text="修改名称"
android:textcolor="#fff"
android:textsize="20sp"/>
<edittext
android:id="@+id/edit_modify"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="组名称"/>
<button
android:id="@+id/btn_commit"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="确定"
android:textcolor="#fff"
android:background="#0099ff"
/>
</linearlayout>
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modifydialog.java
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package com.eric.grouplistdemo;
import android.app.dialog;
import android.content.context;
import android.view.layoutinflater;
import android.view.view;
import android.widget.button;
import android.widget.edittext;
import android.widget.textview;
public class modifydialog extends dialog{
private textview text_title;
private edittext edit_modify;
private button btn_commit;
public modifydialog(context context, string title, string name) {
super(context, r.style.notitledialog);
view view = layoutinflater.from(getcontext())
.inflate(r.layout.dialog_modify, null);
text_title = (textview) view.findviewbyid(r.id.text_title);
edit_modify = (edittext)view.findviewbyid(r.id.edit_modify);
btn_commit = (button) view.findviewbyid(r.id.btn_commit);
text_title.settext(title);
edit_modify.settext(name);
super.setcontentview(view);
}
public edittext getedittext(){
return edit_modify;
}
public void setonclickcommitlistener(view.onclicklistener listener){
btn_commit.setonclicklistener(listener);
}
}
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modifydialog自定义构造函数中，通过super()加载刚刚自定义的no_title_dialog.xml，声明view加载layout布局dialog_modify.xml;并且获取布局中的相应控件，将构造函数中传来的字符串title和name，分别赋值到标题文本和输入框控件中；最后调用setcontentview()初始化对话框视图；
添加一个返回输入框控件的函数getedittext()，用于获取输入框输入的内容；
还需要一个自定义的点击事件监听器，绑定在确定按钮上；
④准备工作都完成了，下面就实现grouplistfragment，包括数据的初始化及持久化保存，组项和子项的增删改操作，列表子项点击事件，列表组项和子项的长按事件；
fragment_group_list.xml 页面的布局文件expandablelistview列表以及一个添加组图标；
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<?xml version="1.0" encoding="utf-8"?>
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<expandablelistview
android:id="@+id/expandablelistview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:groupindicator="@null"
>
</expandablelistview>
<imageview
android:id="@+id/image_add"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_centerhorizontal="true"
android:layout_alignparentbottom="true"
android:src="@drawable/add"/>
</relativelayout>
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这里需要将expandablelistview的groupindicator属性设置为@null，不使用其自带的展开图标；
grouplistfragment.java 加载列表的页面
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package com.eric.grouplistdemo;
import java.util.arraylist;
import java.util.hashmap;
import java.util.list;
import java.util.map;
import org.json.jsonarray;
import org.json.jsonexception;
import org.json.jsonobject;
import android.r.integer;
import android.app.fragment;
import android.content.context;
import android.content.sharedpreferences;
import android.content.sharedpreferences.editor;
import android.os.bundle;
import android.util.log;
import android.view.layoutinflater;
import android.view.view;
import android.view.view.onclicklistener;
import android.view.viewgroup;
import android.widget.adapterview;
import android.widget.edittext;
import android.widget.expandablelistview;
import android.widget.imageview;
import android.widget.toast;
public class grouplistfragment extends fragment{
private view view;
private expandablelistview expandablelistview;
public static myadapter adapter;
public static list<string> parentlist;
public static map<string,list<string>> map;
private modifydialog dialog;
private edittext edit_modify;
private imageview image_add;
private int currentgroup,currentchild;
public static sharedpreferences sp;
public static editor editor;
public static string datamap,dataparentlist;
@override
public view oncreateview(layoutinflater inflater, viewgroup container,
bundle savedinstancestate) {
view = inflater.inflate(r.layout.fragment_group_list, container, false);
expandablelistview = (expandablelistview) view.findviewbyid(r.id.expandablelistview);
image_add = (imageview) view.findviewbyid(r.id.image_add);
image_add.setonclicklistener(new onclicklistener() {
@override
public void onclick(view v) {
alertadddialog(getactivity(), "新增组");
}
});
initdata();
adapter = new myadapter(getactivity().getapplicationcontext(), parentlist, map);
expandablelistview.setadapter(adapter);
//设置子项点击事件
myonclicklistener mylistener = new myonclicklistener();
expandablelistview.setonchildclicklistener(mylistener);
//设置长按点击事件
myonlongclicklistener mylonglistener = new myonlongclicklistener();
expandablelistview.setonitemlongclicklistener(mylonglistener);
return view;
}
public void initdata(){
map = new hashmap<string, list<string>>();
parentlist = new arraylist<string>();
sp = getactivity().getapplicationcontext().getsharedpreferences("spfile", getactivity().mode_private);
datamap = sp.getstring("datamap", null);
dataparentlist = sp.getstring("dataparentlist", null);
if(datamap == null || dataparentlist == null){
parentlist = new arraylist<string>();
parentlist.add("客厅");
parentlist.add("厨房");
parentlist.add("卧室");
list<string> list1 = new arraylist<string>();
list1.add("客厅空调");
list1.add("客厅电视");
list1.add("客厅电灯");
map.put("客厅", list1);
list<string> list2 = new arraylist<string>();
list2.add("厨房油烟机");
list2.add("厨房电灯");
list2.add("厨房电器");
map.put("厨房", list2);
list<string> list3 = new arraylist<string>();
list3.add("卧室空调");
list3.add("卧室灯光");
list3.add("卧室电视");
map.put("卧室", list3);
}else{
try {
//初始化parentlist
jsonarray jsonarray = new jsonarray(dataparentlist);
for (int i = 0; i < jsonarray.length(); i++) {
parentlist.add(jsonarray.get(i).tostring());
}
//初始化map
jsonobject jsonobject = new jsonobject(datamap);
for (int i = 0; i < jsonobject.length(); i++) {
string key = jsonobject.getstring(parentlist.get(i));
jsonarray array = new jsonarray(key);
list<string> list = new arraylist<string>();
for (int j = 0; j < array.length(); j++) {
list.add(array.get(j).tostring());
}
map.put(parentlist.get(i), list);
}
log.d("eric", "①："+map+"②："+parentlist);
} catch (jsonexception e) {
e.printstacktrace();
log.e("eric","string转map或list出错"+e);
}
}
log.e("eric", datamap+"!&&!"+dataparentlist);
savedata();
}
//自定义点击监听事件
public class myonclicklistener implements expandablelistview.onchildclicklistener{
@override
public boolean onchildclick(expandablelistview parent, view v,
int groupposition, int childposition, long id) {
string str = "choose"+groupposition+"-"+childposition;
toast.maketext(getactivity(), str, toast.length_short).show();
return false;
}
}
//自定义长按监听事件
public class myonlongclicklistener implements adapterview.onitemlongclicklistener{
@override
public boolean onitemlongclick(adapterview<?> parent, view view,
int position, long id) {
//长按子项
if (expandablelistview.getpackedpositiontype(id) == expandablelistview.packed_position_type_child){
long packedpos = ((expandablelistview) parent).getexpandablelistposition(position);
int groupposition = expandablelistview.getpackedpositiongroup(packedpos);
int childposition = expandablelistview.getpackedpositionchild(packedpos);
currentgroup = groupposition;
currentchild = childposition;
string str = (string)adapter.getchild(groupposition, childposition);
alertmodifydialog("修改此项名称",str);
toast.maketext(getactivity(),str,toast.length_short).show();
return true;
//长按组
}else if(expandablelistview.getpackedpositiontype(id) == expandablelistview.packed_position_type_group){
long packedpos = ((expandablelistview) parent).getexpandablelistposition(position);
int groupposition = expandablelistview.getpackedpositiongroup(packedpos);
int childposition = expandablelistview.getpackedpositionchild(packedpos);
currentgroup = groupposition;
currentchild = childposition;
string group = parentlist.get(groupposition);
alertmodifydialog("修改组名称", group);
string str = (string)adapter.getgroup(groupposition);
toast.maketext(getactivity(),str,toast.length_short).show();
}
return false;
}
}
//新增组
public static void addgroup(string newgroupname){
parentlist.add(newgroupname);
list<string> list = new arraylist<string>();
map.put(newgroupname, list);
adapter.notifydatasetchanged();
savedata();
}
//新增子项到指定组
public static void addchild(int groupposition, string newchildname){
string groupname = parentlist.get(groupposition);
list<string> list = map.get(groupname);
list.add(newchildname);
adapter.notifydatasetchanged();
savedata();
}
//删除指定组
public static void deletegroup(int grouppos){
string groupname = parentlist.get(grouppos);
map.remove(groupname);
parentlist.remove(grouppos);
adapter.notifydatasetchanged();
savedata();
}
//删除指定子项
public static void deletechild(int grouppos, int childpos){
string groupname = parentlist.get(grouppos);
list<string> list = map.get(groupname);
list.remove(childpos);
adapter.notifydatasetchanged();
savedata();
}
//修改该项名称
public void modifyname(int groupposition, int childposition, string modifyname){
toast.maketext(getactivity(), string.valueof(groupposition)+'-'+string.valueof(childposition), toast.length_short).show();
if(childposition<0){
//修改组名称
string groupname = parentlist.get(groupposition);
if(!groupname.equals(modifyname)){
map.put(modifyname, map.get(groupname));
map.remove(groupname);
parentlist.set(groupposition, modifyname);
}
}else{
//修改子项名称
string group = parentlist.get(groupposition);
list<string> list =map.get(group);
list.set(childposition, modifyname);
map.put(group, list);
}
adapter.notifydatasetchanged();
savedata();
}
//弹修改对话框
public void alertmodifydialog(string title, string name){
dialog = new modifydialog(getactivity(), title, name);
edit_modify = dialog.getedittext();
dialog.setonclickcommitlistener(new onclicklistener() {
@override
public void onclick(view v) {
modifyname(currentgroup, currentchild, edit_modify.gettext().tostring());
dialog.dismiss();
}
});
dialog.show();
}
//弹新增组对话框
public void alertadddialog(context context, string title){
dialog = new modifydialog(context, title, null);
edit_modify = dialog.getedittext();
dialog.setonclickcommitlistener(new onclicklistener() {
@override
public void onclick(view v) {
addgroup(edit_modify.gettext().tostring());
dialog.dismiss();
}
});
dialog.show();
}
//保存数据
public static void savedata(){
jsonobject jsonobject = new jsonobject(map);
datamap = jsonobject.tostring();
dataparentlist = parentlist.tostring();
editor = sp.edit();
editor.putstring("datamap", datamap);
editor.putstring("dataparentlist", dataparentlist);
editor.commit();
}
}
|
内容有点多，一个个来：
初始化fragment页面函数oncreateview():
首先，要进行layout布局fragment_group_list.xml加载，获取相应控件的实例，expandablelistview列表控件以及添加组图标image_add，添加组图标添加点击事件；调用initdata()方法进行组数据parentlist和组对应子项map的初始化；然后，实例化adapter传入parentlist和map数据到自定义适配器myadapter中，并将其绑定到expandablelistview上；最后，给expandablelistview添加自定义子项点击事件监听器，组项和子项长按事件监听器；
初始化数据函数initdata():该函数通过sharereference来保存数据；
首先，实例化parentlist和map，从sharereference中获取到保存的string类型的parentlist和map实际数据，赋值到datamap和dataparentlist中，若当中数据不存在，默认返回null，第一次运行程序的时候肯定是没有数据的，故进行判断，若没获取到数据，那就给parentlist和map赋值“客厅”、“厨房”、“卧室”等一系列数据；如果有数据的话，那就得进行数据的转换，因为之前保存的string类型数据，parentlist初始化：将dataparentlist转换为jsonarray类型，通过循环将数据赋值到parentlist中；同理，将datamap转换为jsonobject类型，通过两层for循环将数据赋值到map中。
自定义点击子项监听其类myonclicklistener：实现expandablelistview.onchildclicklistener接口，这里就简单的进行toast操作，读者可以修改为跳转等其他自定义功能；
自定义长按组项或子项监听器类myonlongclicklistener：实现adapterview.onitemlongclicklistener接口，通过调用expandablelistview的getpackedpositiontype()方法来判断此时长按的是组项还是子项；这里将长按组和子项分离出来，方便根据功能修改；无论是组项还是子项长按后，都调用alertmodifydialog()弹修改对话框，传入当前项的名称；
新增组addgroup函数：将传递过来的newgroupname，添加parentlist中，且定义一个空的list，绑定newgroupname，将这对string和list，添加到map中；最后，调用adapter.notifydatasetchanged()刷新列表，调用savedata()保存数据到sharereference；
同理，新增子项到指定组addchild()，删除指定组deletegroup()，删除指定子项deletechild()，都是对parentlist和map进行操作，最后刷新列表和保存数据；
修改该项名称modifyname():通过传递过来childposition进行判断，当修改项为组项时，childposition的值为-1，以此区分组项和子项；这里遇到一个问题，当组项提交的名称与原名称相同会报错，故添加一个判断，仅提交的名称不同时才进行修改操作；修改的具体实现还是对parentlist和map的操作，以修改组项为例，同新增组，添加一个modifyname的组，其对应的list为原来组名对应的list数据，然后再将原来的groupname组及其对应的list删除，实现修改；最后同样要刷新列表和保存数据；
弹修改对话框alertmodifydialog()函数：首先对自定义的dialog进行实例化，初始化标题和输入框中的数据；调用getedittext()函数获取输入框实例，添加提交按钮点击事件，调用modifyname方法传入当前组和子项数据，以及输入框中提交的文本；
弹新增组对话框alertadddialog()函数：同样，实例化dialog，获取输入框控件，点击事件中调用addgroup()方法添加数据；
保存数据savedata()函数：将parentlist和map数据转化为string类型，分别赋值，保存至sharereference的editor中并提交；
以上就是本文的全部内容，希望对大家的学习有所帮助。