Android ListView长按弹出菜单二种实现方式示例
/**
* 知识点1：listview item:两种长按弹出菜单方式
* 知识点2：listview simpleadapter的使用
* 知识点 3：在java代码中创建一个listview
*/
public class listonlongclickactivity extends activity {
private linearlayout mylistviewlayout;
private listview mlistview;
simpleadapter adapter;
public int mid;
// 创建一个list对象，用来存放列表项的每一行map信息
list<map<string, object>> list = new arraylist<map<string, object>>();
@override
public void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.main);
mylistviewlayout = (linearlayout) findviewbyid(r.id.mylistviewlayout);
mlistview = new listview(this);
// 创建布局参数
linearlayout.layoutparams listviewparams = new linearlayout.layoutparams(
linearlayout.layoutparams.fill_parent,
linearlayout.layoutparams.fill_parent);
// 当滑动列表上，默认显示的黑色
mlistview.setcachecolorhint(color.white);
// 将列表添加到流式布局mylistviewlayout中
mylistviewlayout.addview(mlistview, listviewparams);
filllistdata();
// 列表现的单机事件
mlistview.setonitemclicklistener(new onitemclicklistener() {
@override
public void onitemclick(adapterview<?> arg0, view arg1,
int position, long id) {
/*
* 点击列表项时触发onitemclick方法，四个参数含义分别为
* arg0：发生单击事件的adapterview
* arg1：adapterview中被点击的view
* position：当前点击的行在adapter的下标
* id：当前点击的行的id
*/
toast.maketext(listonlongclickactivity.this,
"您选择的是" + list.get(position).get("name").tostring(),
toast.length_short).show();
}
});
/**
* item 长按方式弹出菜单多选方式1
* item 长按方式弹出菜单多选方式2
* itemonlongclick1()与itemonlongclick2()不共存，按实际需要选择
*/
// itemonlongclick1();
itemonlongclick2();
}
// 填充listview资源
private void filllistdata() {
adapter = new simpleadapter(listonlongclickactivity.this,
getlistdata(), r.layout.listviewrow, new string[] { "name",
"price" }, new int[] { r.id.tv_name, r.id.tv_price });
mlistview.setadapter(adapter);
}
private list<map<string, object>> getlistdata() {
map<string, object> _map = new hashmap<string, object>();
_map.put("name", "小米");
_map.put("price", "2350元");
list.add(_map);
_map = new hashmap<string, object>();
_map.put("name", "htc g18");
_map.put("price", "3340元");
list.add(_map);
_map = new hashmap<string, object>();
_map.put("name", "iphone 5");
_map.put("price", "5450元");
list.add(_map);
_map = new hashmap<string, object>();
_map.put("name", "iphone 4s");
_map.put("price", "4650元");
list.add(_map);
_map = new hashmap<string, object>();
_map.put("name", "moto me525");
_map.put("price", "1345元");
list.add(_map);
return list;
}
private void itemonlongclick1() {
//注：setoncreatecontextmenulistener是与下面oncontextitemselected配套使用的
mlistview
.setoncreatecontextmenulistener(new oncreatecontextmenulistener() {
public void oncreatecontextmenu(contextmenu menu, view v,
contextmenuinfo menuinfo) {
menu.add(0, 0, 0, "购买");
menu.add(0, 1, 0, "收藏");
menu.add(0, 2, 0, "对比");
}
});
}
// 长按菜单响应函数
public boolean oncontextitemselected(menuitem item) {
adapterview.adaptercontextmenuinfo info = (adapterview.adaptercontextmenuinfo) item
.getmenuinfo();
mid = (int) info.id;// 这里的info.id对应的就是数据库中_id的值
switch (item.getitemid()) {
case 0:
// 添加操作
toast.maketext(listonlongclickactivity.this,
"添加",
toast.length_short).show();
break;
case 1:
// 删除操作
break;
case 2:
// 删除all操作
break;
default:
break;
}
return super.oncontextitemselected(item);
}
private void itemonlongclick2() {
mlistview.setonitemlongclicklistener(new onitemlongclicklistener() {
@override
public boolean onitemlongclick(adapterview<?> arg0, view arg1,
final int arg2, long arg3) {
list.remove(arg2);
new alertdialog.builder(listonlongclickactivity.this)
.settitle("对item进行操作")
.setitems(r.array.arrcontent,
new dialoginterface.onclicklistener() {
public void onclick(dialoginterface dialog,
int which) {
string[] pk = getresources()
.getstringarray(
r.array.arrcontent);
toast.maketext(
listonlongclickactivity.this,
pk[which], toast.length_long)
.show();
if (pk[which].equals("删除")) {
// 按照这种方式做删除操作，这个if内的代码有bug，实际代码中按需操作
list.remove(arg2);
adapter = (simpleadapter) mlistview
.getadapter();
if (!adapter.isempty()) {
adapter.notifydatasetchanged(); // 实现数据的实时刷新
}
}
}
})
.setnegativebutton("取消",
new dialoginterface.onclicklistener() {
public void onclick(dialoginterface dialog,
int which) {
// todo auto-generated method stub
}
}).show();
return true;
}
});
}
}
-----------
listviewrow.xml
代码片段， <?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:background="@drawable/listviewbg"
android:orientation="vertical" >
<textview
android:id="@+id/tv_name"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textcolor="@android:color/black" />
<textview
android:id="@+id/tv_price"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textcolor="@android:color/black" />
</linearlayout>