AdapterContextMenuInfo总是空 [英] AdapterContextMenuInfo is always null

问题描述

我试图通过这本书从Android开发文档这样做

I tried doing this by the book from android dev docs:

// this didn't create a menu, i don't know why
//registerForContextMenu(getListView());

setListAdapter(new ArrayAdapter<Note>(this, R.layout.selectset_listitem) {
    @Override

    protected View getView(...) {
        ... custom layout ...

        // this creates a menu, but...
        registerForContextMenu(convertView);

        return convertView;
    }
}

以及 onCreateContextMenu 和 onContextItemSelected 几乎完全一样的的 http://developer.android.com/guide/topics/ui/menus.html#context-menu

在这里是如何看起来在文档（和我的code）：

here is how it looks in the docs (and my code):

@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);
}

但这一部分总是给我一个空的信息：

but this part always gives me a null info:

public boolean onContextItemSelected(MenuItem item) {
    AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
    ...
}

这是真正独特的唯一的事情是，我已经有了一个列表项自定义布局（即一对夫妇的文本字段和图像）。有什么我需要做的是能够获取列表项，上下文菜单是为？建的指数

The only thing that is really unique is that i've got a custom layout for list items (i.e. a couple of text fields and an image). Is there something i need to do to be able to get the index of the list item that the context menu was built for?

推荐答案

您需要调用 registerForContextMenu（）中的的ListView活动，而不是在适配器的视图中的项目。

You need to call the registerForContextMenu() in the activity on the ListView, and not on the view items in the adapter.

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