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(); } } |
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> |
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> |
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> |
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(); } } |
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> |
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> |
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); } } |
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> |
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。
