* 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>
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