已被点击后，如何禁用ListView项？ [英] How to disable ListView item after it has been clicked?

问题描述

我字符串的简单数组，我是在一个水平的ListView 与<$ C $显示C> ArrayAdapter 。 什么我希望做的是：当用户选择从项目的的ListView ，使该项目不可点击，改变背景颜色该项目。也许像灰显，看它。我一直在寻找为创建自定义的适配器并重写 isEnabled（INT位置）方法，但我不知道如何我会去这一点。任何意见，建议或帮助将大大AP preciated感谢！

解决方案

  

我一直在寻找为创建一个自定义适配器并重写 isEnabled（INT位置）方法，但我不知道我怎么会去了解这一点。

这是很容易做到。我推荐一个SparseBooleanArray跟踪启用的项目效率：

 公共类MyAdapter扩展ArrayAdapter＆LT;串GT; {
    私人SparseBooleanArray enabledItems =新SparseBooleanArray（）;    公共MyAdapter（上下文的背景下，INT textViewResourceId，列表与LT;弦乐＆GT;对象）{
        超（背景下，textViewResourceId，对象）;
    }    @覆盖
    公共布尔areAllItemsEnabled（）{
        返回false;
    }    @覆盖
    公共布尔isEnabled（INT位置）{
        返回enabledItems.get（位置，真正的）;
    }    公共无效toggleItem（INT位置）{
        布尔州= enabledItems.get（位置，真正的）;
        enabledItems.put（位置，状态！）;
    }
}
 

Eclipse中的自动完成功能所做的工作中必须的，但这里有一些快速的注意事项：

• 您必须重写 areAllItemsEnabled（）与沿isEnabled（）


• 我设计切换（）来通过使用 onItemClickListener（）你只需要调用 adapter.toggle（位置）



• 如果你想改变行的外观（不是系统默认的是什么允许和禁止做更多）简单地覆盖 getView（）。不要忘了包括两种情况：

   公共查看getView（INT位置，查看convertView，父母的ViewGroup）{
      convertView = super.getView（位置，convertView，父母）;    如果（！isEnabled（位置））{
          / *更改为禁用外观* /
      }
      其他{
          / *恢复默认外观* /
      }
      返回convertView;
  }
   

  希望帮助！

I have a simple array of Strings that I was displaying in a horizontal ListView with an ArrayAdapter. What I'm looking to do is: when the user selects an item from the ListView, make that item not clickable and change the background color of that item. Perhaps like a "grayed-out" look to it. I was looking into creating a custom Adapter and overriding the isEnabled(int position) method but I don't know how I would go about this. Any advice, suggestions, or help will be greatly appreciated thanks!

解决方案

I was looking into creating a custom Adapter and overriding the isEnabled(int position) method but I don't know how I would go about this.

This is quite easy to do. I recommend a SparseBooleanArray to track the enabled items for efficiency:

public class MyAdapter extends ArrayAdapter<String> {
    private SparseBooleanArray enabledItems = new SparseBooleanArray(); 

    public MyAdapter(Context context, int textViewResourceId, List<String> objects) {
        super(context, textViewResourceId, objects);
    }

    @Override
    public boolean areAllItemsEnabled() {
        return false;
    }

    @Override
    public boolean isEnabled(int position) {
        return enabledItems.get(position, true);
    }

    public void toggleItem(int position) {
        boolean state = enabledItems.get(position, true);
        enabledItems.put(position, !state);
    }
}

The AutoComplete feature of Eclipse did must of the work, but here are some quick notes:

• You must override areAllItemsEnabled() along with isEnabled()
• I designed toggle() to be used by an onItemClickListener() you only need to call adapter.toggle(position)

• If you want to change the row's appearance (more than what enabling and disabling does by default) simply override getView(). Don't forget to cover both cases:

  public View getView(int position, View convertView, ViewGroup parent) {
      convertView = super.getView(position, convertView, parent);
  
      if(!isEnabled(position)) { 
          /* change to disabled appearance */ 
      } 
      else { 
          /* restore default appearance */ 
      }
      return convertView;
  }
  

  Hope that helps!

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