Android:无法样式微调分隔线 [英] Android: Cannot style spinner divider

问题描述

我正在尝试为我的第一个 Android 应用创建一个主题，这让我不知所措.我终于设法弄清楚如何为下拉列表中的项目设置样式，但现在我无法更改列表项目之间分隔线的颜色.我在 stackoverflow 上搜索过类似的问题，尝试了几十种组合，但似乎没有任何效果.

I'm trying to create a theme for my first Android app, and it is driving me round the bend. I finally managed to figure out how to style items in a dropdown list, but now I can't change the colour of the divider between list items. I have searched similar questions on stackoverflow, and tried dozens of combinations, but nothing seems to work.

这是我的styles.xml文件(为了清楚起见而缩写):

Here is my styles.xml file (abbreviated for clarity):

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <style name="MyTheme" parent="android:Theme.Light">
    <item name="android:spinnerStyle">@style/spinnerStyle</item>
    <item name="android:spinnerDropDownItemStyle">@style/spinnerDropDownItemStyle</item>    
    <item name="android:dropDownListViewStyle">@style/spinnerListViewStyle</item>
  </style>

  <style name="spinnerStyle" parent="@android:style/Widget.Spinner">
      <item name="android:background">@drawable/my_theme_spinner</item>
  </style>

  <style name="spinnerDropDownItemStyle" parent="@android:style/Widget.DropDownItem.Spinner">
      <item name="android:background">@drawable/my_theme_spinner_item</item>
      <item name="android:paddingLeft">5dp</item>
      <item name="android:gravity">center_vertical</item>
  </style>

  <style name="spinnerListViewStyle" parent="@android:style/Widget.ListView.DropDown">
      <item name="android:height">3dp</item>
      <item name="android:dividerHeight">3dp</item>
      <item name="android:divider">@color/divider</item>
  </style>
</resources>

无论我做什么，我都会在项目之间得到一个 1dp 的浅灰色分隔线(在我的浅色列表项目背景下几乎看不到)——分隔线的高度和颜色都不会受到影响(我也尝试过设置它可以绘制，也没有效果).我做错了什么?

No matter what I do, I just get a 1dp light grey divider between items (which can barely be seen with my light coloured list item background) - neither the height nor colour of the divider is ever affected (I also tried setting it to a drawable, also with no effect). What am I doing wrong?

推荐答案

我有一个非常简单的 Activity 和 Spinner，它适用于以下情况.我看到的唯一区别是你有一个 <item name="android:height">3dp</item> 而我根本没有.

I have a very simple Activity with the Spinner and it works for the following. The only difference I see is that you have a <item name="android:height">3dp</item> and I don't have that at all.

<style name="TestSpinnerStyle" parent="android:style/Widget.ListView.DropDown">
    <item name="android:divider">#ff0000</item>
    <item name="android:dividerHeight">5dp</item>
</style>


<style name="SampleTheme" parent="@android:style/Theme.Holo.Light">
    <item name="android:dropDownListViewStyle">@style/TestSpinnerStyle</item>
</style>

在我的活动中，我有:

    Spinner spinner = (Spinner) findViewById(R.id.spinner);
    List<String> list = new ArrayList<String>();
    list.add("list 1");
    list.add("list 2");
    list.add("list 3");
    ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_spinner_item, list);
    dataAdapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
    spinner.setAdapter(dataAdapter);

然后对于主要布局，我有以下 XML:

and then for the main layout I have the following XML:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent"
        >
    <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="Hello World, StylingActivity"
            />
    <Spinner android:id="@+id/spinner"
             android:layout_width="250dp"
             android:layout_height="40dp"
             />
</LinearLayout>

这是截图

如果您无法从那里开始工作，我可以为您将整个内容推送到 github 存储库.

If you can't get it to work from there, I can push up the entire thing to a github repo for you.

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