动作条列表导航宽度 - 包装内容 [英] Actionbar list navigation width - wrap content

问题描述

在默认情况下在所选项目的动作条列表导航宽度一样宽，最宽的项目。我想在选定的项目为WRAP_CONTENT，因为它是在谷歌+，Gmail的，地图Android应用程序。

By default in actionbar list navigation width of selected item is as wide as widest item. I would like to "wrap_content" in selected item as it's in google+,gmail,maps android apps.

是否有人知道热办呢？

我试图重写导航适配器的getView，但它不工作。看来，这种观点是包裹着另一种观点认为它具有宽最宽的项目。我也试过actionbar.setCustom视图微调，但微调的行为是一样的。它采用最宽的项目宽度。

I tried to override getView of navigation adapter but it doesn't work. It looks that this view is wrapped with another view which has width of widest item. I also tried actionbar.setCustom view with spinner but spinner behaviour is same. It uses widest item width.

感谢所有的建议，链接和帮助。

Thanks for all suggestions, links and help.

推荐答案

我遇到了同样的问题。看来Android将调用getView（）方法的所有项目，最后设置的宽度最宽的项目的宽度。

I've met the same problem. It seems Android will call getView() method for all the items, and finally set the width to the widest item's width.

因此​​，这里是我的解决方案：

So here's my solution:

1. 存储当前选定的部分（在你的例子，例如部分），说selectedSection，在code。其实你需要做的是在NavigationListener的onNavigationItemSelected（）方法。

1. Store the current selected section(e.g. section in your example), say selectedSection, in your code. Actually you have to do it in the onNavigationItemSelected() method of NavigationListener.

覆盖您SpinnerAdapter的getView（）方法，始终将它的内容selectedSection。

Override the getView() method of your SpinnerAdapter, always set it's content to selectedSection.

在NavigationListener的onNavigationItemSelected（）方法，尝试之后，您将当前模式设置为selectedSection打电话给你spinnerAdapter的notifyDataSetChanged（）方法。

In the onNavigationItemSelected() method of NavigationListener, try to call the notifyDataSetChanged() method of your spinnerAdapter after you set the current mode to selectedSection.

下面的示例code：

final int selectedSection = 0;
final String sectionLabels[] = {"short sec", "long section", "looooonger section"};

final ArrayAdapter<String> arrayAdapter =
  new arrayAdapter<String>(this, simple_list_item_1) {
    @Override
    public int getCount() {
      // You need to implement here.
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
      if (convertView == null) {
        convertView = LayoutInflater.from(getContext()).inflate(R.layout.you_entry, null);
      }
      TextView textView = (TextView) convertView.findViewById(R.id.you_text);
      // Set the text to the current section.
      textView.setText(sectionLabels[selectedSection]);
    }

    @Override
    public View getDropDownView(int position, View convertView, ViewGroup parent) {
      // You need to implement here.
    }

  }

actionBar.setListNavigationCallbacks(navigationAdpater,
  new ActionBar.OnNavigationListener() {

    @Override
    public boolean onNavigationItemSelected(int itemPosition, long itemId) {
      // Store the current section.
      selectedSection = itemPosition;
      navigationAdpater.notifyDataSetChanged();
      return true;
    }
  });

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