Android上下文菜单，长按出现的菜单

[code]<menu xmlns:android="http://schemas.android.com/apk/res/android" >
    <item
        android:id="@+id/action_delete"
        android:icon="@android:drawable/ic_menu_delete"
        android:showAsAction="ifRoom"
        android:title="@string/action_delete"/>
</menu>

[code]    @Override
    public void onCreateContextMenu(ContextMenu menu, View v,
            ContextMenuInfo menuInfo) {
        super.onCreateContextMenu(menu, v, menuInfo);
        getMenuInflater().inflate(R.menu.list_item_context, menu);
    }

[code]        ListView listView=(ListView) findViewById(R.id.list);
        registerForContextMenu(listView);

[code]    @Override
    public boolean onContextItemSelected(MenuItem item) {
        // TODO Auto-generated method stub
        AdapterContextMenuInfo info=(AdapterContextMenuInfo)item.getMenuInfo();
        int positon=info.position;
        switch (item.getItemId()) {
        case R.id.action_delete:
            Log.e("ContextItemSelect", "you have delete"+positon);
            return true;
        }

        return super.onContextItemSelected(item);
    }