使用自定义的BaseAdapter实现LIstView的展示
使用自定义的baseadapter实现listview的展示实现以下功能点：
1.通过自定义的baseadapter展示listview；
2.动态修改、刷新listview内容；
3.在自定义的baseadapter中实现listview内容的点击和长按点击事件；
4.在baseadapter的getview方法中动态增加新组件；
效果图如下：
<span style="color: #008000; font-size: large;">xml配置文件1（list_view01.xml）</span>
<?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" > <linearlayout android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="wrap_content" > <edittext android:id="@+id/edittext01edit" android:layout_width="110sp" android:layout_height="wrap_content" android:text="" /> <button android:id="@+id/button01edit" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="动态修改第1行第2列数据" android: /></linearlayout><listview android:id="@+id/listview01" android:layout_width="fill_parent" android:layout_height="fill_parent" /></linearlayout>
<span style="color: #008000; font-size: large;">xml配置文件2（list_view01_item.xml）</span>
<?xml version="1.0" encoding="utf-8"?><linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="fill_parent" ><textview android:id="@+id/listview01item01" android:layout_width="50sp" android:layout_height="wrap_content" /><textview android:id="@+id/listview01item02" android:layout_width="90sp" android:layout_height="wrap_content" /> <textview android:id="@+id/listview01item03" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </linearlayout> <span style="color: #008000; font-size: large;">activity类代码:</span>
package com.zhouzijing.android;import java.util.arraylist;import java.util.list;import com.zhouzijing.android.util.menuentity;import android.app.activity;import android.os.bundle;import android.view.contextmenu;import android.view.contextmenu.contextmenuinfo;import android.view.menuitem;import android.view.view;import android.view.view.oncreatecontextmenulistener;import android.widget.adapterview;import android.widget.adapterview.adaptercontextmenuinfo;import android.widget.adapterview.onitemclicklistener;import android.widget.adapterview.onitemlongclicklistener;import android.widget.adapterview.onitemselectedlistener;import android.widget.baseadapter;import android.widget.edittext;import android.widget.listadapter;import android.widget.listview;import android.widget.toast;public class listviewdemo extends activity {//定义personlist<person> persons ;listadapter adapter = null;listview listview01 = null;edittext edittextpersonname = null;//定义上下文菜单 final private static int context_menu_edit = 0;//菜单[编辑]的编号 final private static int context_menu_share = 1;//菜单[分享]的编号 final private static int context_menu_delete = 2;//菜单[删除]的编号 final private static int context_menu_cancel = 3;//菜单[取消]的编号 private menuentity[] contextmenus = { new menuentity(0, context_menu_edit, 0, "编辑"), new menuentity(0, context_menu_share, 1, "分享"), new menuentity(0, context_menu_delete, 2, "删除"), new menuentity(0, context_menu_cancel, 3, "取消"), };@override public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.list_view01); //获取组件 listview01 = (listview)findviewbyid(r.id.listview01); edittextpersonname = (edittext)findviewbyid(r.id.edittext01edit); //显示listview initlistallpersons(); showbymybaseadapter(); //初始化listview的事件 //initlistview01event(); }public void initlistallpersons(){persons = new arraylist<person>();persons.add(new person(100,"李小龙","香港",android.r.drawable.ic_delete));persons.add(new person(101,"施瓦辛格","美国",android.r.drawable.ic_dialog_alert));persons.add(new person(102,"戴安娜王妃","英国",android.r.drawable.ic_dialog_dialer));persons.add(new person(103,"成龙","香港",android.r.drawable.ic_dialog_map));persons.add(new person(104,"史泰龙","美国",android.r.drawable.ic_lock_idle_alarm));persons.add(new person(105,"圣女贞德","法国",android.r.drawable.ic_media_next));persons.add(new person(106,"列宁","苏联",android.r.drawable.ic_media_play));persons.add(new person(107,"爱迪生","美国",android.r.drawable.ic_menu_add));persons.add(new person(108,"孔子","中国",android.r.drawable.ic_media_rew));persons.add(new person(109,"杨七郎","宋朝",android.r.drawable.ic_menu_zoom));persons.add(new person(110,"秦始皇","秦国",android.r.drawable.ic_menu_agenda));persons.add(new person(111,"岳飞","宋朝",android.r.drawable.ic_lock_lock));}public void showbymybaseadapter(){adapter = new mybaseadapter(this, persons);listview01.setadapter(adapter);}/** * 按钮button01edit的onclick事件. * @param view */public void editpersonandrefreshlistview01(view view){//获取textedit数据string value = edittextpersonname.gettext().tostring();//更新listview的内容，并且动态刷新.persons.get(0).name=value;((baseadapter) adapter).notifydatasetchanged();}/** * 初始化listview01的事件. */public void initlistview01event(){//listview的item点击事件listview01.setonitemclicklistener(new onitemclicklistener(){@overridepublic void onitemclick(adapterview<?> parent, view view,int position, long id) {toast.maketext(getapplicationcontext(), "点击了："+persons.get(position).name, toast.length_short).show();}});//listview的item长按点击事件listview01.setonitemlongclicklistener(new onitemlongclicklistener(){@overridepublic boolean onitemlongclick(adapterview<?> parent, view view,int position, long id) {toast.maketext(getapplicationcontext(), "点击了："+persons.get(position).name, toast.length_short).show();return false;}});//listview的键盘选中事件(直接触摸屏幕选中不会激发)listview01.setonitemselectedlistener(new onitemselectedlistener(){@overridepublic void onitemselected(adapterview<?> parent, view view,int position, long id) {toast.maketext(getapplicationcontext(), "点击了："+persons.get(position).name, toast.length_short).show();}@overridepublic void onnothingselected(adapterview<?> parent) {toast.maketext(getapplicationcontext(), "点击了", toast.length_short).show();}});//listview组件:创建上下文菜单listview01.setoncreatecontextmenulistener(new oncreatecontextmenulistener(){@overridepublic void oncreatecontextmenu(contextmenu menu, view v,contextmenuinfo menuinfo) {//获取上下文菜单点击的listview的位置(position)属性adaptercontextmenuinfo info = (adaptercontextmenuinfo) menuinfo;int position = info.position;//设置上下文菜单标题menu.setheadertitle(persons.get(position).name);//设置上下文菜单栏目menuentity menuentity = null; for(int i=0;i<contextmenus.length;i++){ menuentity = contextmenus; menu.add(menuentity.getgroupid(),menuentity.getitemid(),menuentity.getorder(),menuentity.gettitle()); }}});}//监听选择上下文菜单的选择事件@overridepublic boolean oncontextitemselected(menuitem item) {//选中的上下文菜单的itemidint itemid = item.getitemid();//获取上下文菜单点击的listview的位置(position)属性adaptercontextmenuinfo info = (adaptercontextmenuinfo) item.getmenuinfo();int position = info.position;//toasttoast.maketext(getapplicationcontext(), "点击了"+persons.get(position).name+"" +",菜单="+contextmenus.gettitle(), toast.length_short).show();return true;}} <span style="color: #008000; font-size: large;">person类代码</span>
package com.zhouzijing.android;public class person {public int id;public string name;public string address;public int photo;public person(int id, string name, string address,int photo) {super();this.id = id;this.name = name;this.address = address;this.photo = photo;}}
<span style="color: #008000; font-size: large;">自定义的baseadapter类代码</span>
package com.zhouzijing.android;import java.util.list;import android.content.context;import android.util.log;import android.view.gravity;import android.view.layoutinflater;import android.view.view;import android.view.view.onclicklistener;import android.view.view.onlongclicklistener;import android.view.viewgroup;import android.widget.baseadapter;import android.widget.imageview;import android.widget.linearlayout;import android.widget.textview;import android.widget.toast;public class mybaseadapter extends baseadapter {private list<person> persons;context context;public mybaseadapter(context context,list<person> persons){this.persons = persons;this.context = context;}@overridepublic int getcount() {return (persons==null)?0:persons.size();}@overridepublic object getitem(int position) {return persons.get(position);}@overridepublic long getitemid(int position) {return position;}public class viewholder{textview textviewitem01;textview textviewitem02;textview textviewitem03;imageview imageview;}@overridepublic view getview(int position, view convertview, viewgroup parent) {final person person = (person)getitem(position);viewholder viewholder = null;if(convertview==null){log.d("mybaseadapter", "新建convertview,position="+position);convertview = layoutinflater.from(context).inflate(r.layout.list_view01_item, null);viewholder = new viewholder();viewholder.textviewitem01 = (textview)convertview.findviewbyid(r.id.listview01item01);viewholder.textviewitem02 = (textview)convertview.findviewbyid(r.id.listview01item02);viewholder.textviewitem03 = (textview)convertview.findviewbyid(r.id.listview01item03);//动态增加1个imageviewviewholder.imageview = new imageview(context);linearlayout.layoutparams mparams = new linearlayout.layoutparams(linearlayout.layoutparams.wrap_content,linearlayout.layoutparams.wrap_content);mparams.gravity = gravity.center;mparams.width=50;viewholder.imageview.setlayoutparams(mparams);//这个imageview放到listview的第2列之后((linearlayout)convertview).addview(viewholder.imageview,2);convertview.settag(viewholder);}else{viewholder = (viewholder)convertview.gettag();log.d("mybaseadapter", "旧的convertview,position="+position);}viewholder.textviewitem01.settext(string.valueof(person.id));viewholder.textviewitem02.settext(person.name);viewholder.textviewitem03.settext(person.address);viewholder.imageview.setimageresource(person.photo);//对listview中第1个textview配置onclick事件viewholder.textviewitem01.setonclicklistener(new onclicklistener(){@overridepublic void onclick(view v) {toast.maketext(context, "点击了"+person.name, toast.length_short).show();}});//对listview中的每一行信息配置onclick事件convertview.setonclicklistener(new onclicklistener(){@overridepublic void onclick(view v) {toast.maketext(context, "点击了"+person.name, toast.length_short).show();}});//对listview中的每一行信息配置onlongclick事件convertview.setonlongclicklistener(new onlongclicklistener(){@overridepublic boolean onlongclick(view v) {toast.maketext(context, "点击了"+person.name, toast.length_short).show();return true;}});return convertview;}} <span style="color: #008000; font-size: medium;">menuentity类代码：</span>
package com.zhouzijing.android.util;/** * 定义菜单实体结构. * @author stephen * */public class menuentity{/** * 生成菜单. * @param groupid * @param itemid * @param order * @param title */public menuentity(int groupid, int itemid, int order, charsequence title) {super();this.groupid = groupid;this.itemid = itemid;this.order = order;this.title = title;}/** * 组. */private int groupid;/** * 菜单编号. */private int itemid;/** * 显示顺序号. */private int order;/** * 菜单显示名称. */private charsequence title;/** * @return the groupid */public int getgroupid() {return groupid;}/** * @param groupid the groupid to set */public void setgroupid(int groupid) {this.groupid = groupid;}/** * @return the itemid */public int getitemid() {return itemid;}/** * @param itemid the itemid to set */public void setitemid(int itemid) {this.itemid = itemid;}/** * @return the order */public int getorder() {return order;}/** * @param order the order to set */public void setorder(int order) {this.order = order;}/** * @return the title */public charsequence gettitle() {return title;}/** * @param title the title to set */public void settitle(charsequence title) {this.title = title;}}
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