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;    }