Creating a floating context menu上下文菜单

步骤如下，代码不完全

1、 calling registerForContextMenu()

//给listview注册上下文菜单
registerForContextMenu(lv_call_sms_safe);

2、calls your onCreateContextMenu() method

@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.context_menu, menu);//这段代码把资源文件中的menu的配置转化为对象
}

3、context_menu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:id="@+id/update_number" android:title="更改"></item>
<item android:id="@+id/delete_number" android:title="删除"></item>

</menu>

4、Implement onContextItemSelected()

@Override
public boolean onContextItemSelected(MenuItem item) {
AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
int id=(int) info.id;
String number=numbers.get(id);
switch (item.getItemId()) {
case R.id.update_number://更新条目的操作

updatenumber(number);

break;
case R.id.delete_number:
//获取当前条目的id
dao.delete(number);//从数据库中删除
//          重新获取号码
numbers=dao.getAllNumber();
adapter.notifyDataSetChanged();

break;

}
return false;
}