Android的：如何禁用列表创建列表项 [英] Android: How to disable list items on list creation

问题描述

我是pretty的新Android开发人员，仍然制定了很多东西。

I'm pretty new to Android dev and still working out a lot of things.

我得说明使用下面的code主菜单，但不知道如何禁用在菜单中选择项目。任何人可以帮助我一些样品code？

I've got a main menu showing using the following code, but can't work out how to disable selected items in the menu. Can anybody help me with some sample code?

public class listTest extends ListActivity {

    @Override
    public void onCreate(Bundle savedState) {
        super.onCreate(savedState);
        setListAdapter(ArrayAdapter.createFromResource(this, R.array.mainMenu,
                android.R.layout.simple_list_item_1)); 
        //not sure how to disable list items here
    }

    protected void onListItemClick(ListView list, View view, int position, long id) {
        // can disable items when they are clicked on
        view.setEnabled(false);
    }   

}

和我在我的strings.xml文件中的字符串数组：

and I have a string-array in my strings.xml file:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="mainMenu">
        <item>Item 1</item>
        <item>Item 2</item>
        <item>Item 3</item>
    </string-array> 
</resources>

感谢您

推荐答案

为了禁用列表创建列表项必须由 ArrayAdapter 的子类。你必须重写以下方法：的IsEnabled（INT位置）和 areAllItemsEnabled（）。在以往的返回真或假根据是启用还是没有得到职位列表项。在后者返回假。

In order to disable list items on list creation you have to subclass from ArrayAdapter. You have to override the following methods: isEnabled(int position) and areAllItemsEnabled(). In former you return true or false depending is list item at given position enabled or not. In latter you return false.

如果你想使用 createFromResource（），你将必须实现该方法为好，因为 ArrayAdapter.createFromResource（）仍实例 ArrayAdapter ，而不是你自己的适配器。

If you want to use createFromResource() you will have to implement that method as well, since the ArrayAdapter.createFromResource() still instantiates ArrayAdapter instead of your own adapter.

最后，code看起来像下面这样：

Finally, the code would look something like the following:

class MenuAdapter extends ArrayAdapter<CharSequence> {

    public MenuAdapter(
            Context context, int textViewResId, CharSequence[] strings) {
        super(context, textViewResId, strings);
    }

    public static MenuAdapter createFromResource(
            Context context, int textArrayResId, int textViewResId) {

        Resources      resources = context.getResources();
        CharSequence[] strings   = resources.getTextArray(textArrayResId);

        return new MenuAdapter(context, textViewResId, strings);
    }

    public boolean areAllItemsEnabled() {
        return false;
    }

    public boolean isEnabled(int position) {
        // return false if position == position you want to disable
    }
}

这篇关于Android的：如何禁用列表创建列表项的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！