如何在样式中引用主题属性？

Question

我遇到了以下问题。我想自定义列表中行的外观，但是在膨胀过程中抛出异常。

style.xml 中的一段代码

<style name="AppTheme.Main">     
    <item name="item_shadowColor">#000000</item>        
</style>
<style name="item_label">    
    <item name="android:shadowColor">?attr/item_shadowColor</item>        
</style>

attr.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <attr name="item_shadowColor" format="color" />
</resources>

list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >

    <TextView
        android:id="@id/title"
        style="@style/item_label"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"/>

</LinearLayout>

还有例外

FATAL EXCEPTION: main
 android.view.InflateException: Binary XML file line #7: Error inflating class <unknown>
    at android.view.LayoutInflater.createView(LayoutInflater.java:606)
    at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
    at android.view.LayoutInflater.onCreateView(LayoutInflater.java:653)
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:678)
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:739)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
    at ru.mts.goodok.adapter.CategoryListAdapter.getView(CategoryListAdapter.java:30)
    at android.widget.AbsListView.obtainView(AbsListView.java:2052)
    at android.widget.ListView.makeAndAddView(ListView.java:1820)
    at android.widget.ListView.fillDown(ListView.java:672)
    at android.widget.ListView.fillFromTop(ListView.java:732)
    at android.widget.ListView.layoutChildren(ListView.java:1673)
    at android.widget.AbsListView.onLayout(AbsListView.java:1882)
    at android.view.View.layout(View.java:11425)
    at android.view.ViewGroup.layout(ViewGroup.java:4232)
    at android.widget.RelativeLayout.onLayout(RelativeLayout.java:925)
    at android.view.View.layout(View.java:11425)
    at android.view.ViewGroup.layout(ViewGroup.java:4232)
    at android.widget.FrameLayout.onLayout(FrameLayout.java:431)
    at android.view.View.layout(View.java:11425)
    at android.view.ViewGroup.layout(ViewGroup.java:4232)
    at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1628)
    at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1486)
    at android.widget.LinearLayout.onLayout(LinearLayout.java:1399)
    at android.view.View.layout(View.java:11425)
    at android.view.ViewGroup.layout(ViewGroup.java:4232)
    at android.widget.FrameLayout.onLayout(FrameLayout.java:431)
    at android.view.View.layout(View.java:11425)
    at android.view.ViewGroup.layout(ViewGroup.java:4232)
    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1516)
    at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2505)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:154)
    at android.app.ActivityThread.main(ActivityThread.java:4945)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
    at dalvik.system.NativeStart.main(Native Method)
 Caused by: java.lang.reflect.InvocationTargetException
    at java.lang.reflect.Constructor.constructNative(Native Method)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:417)
    at android.view.LayoutInflater.createView(LayoutInflater.java:586)
    ... 39 more
 Caused by: java.lang.NumberFormatException: Invalid int: "?2130771972"
    at java.lang.Integer.invalidInt(Integer.java:138)
    at java.lang.Integer.parse(Integer.java:375)
    at java.lang.Integer.parseInt(Integer.java:366)
    at com.android.internal.util.XmlUtils.convertValueToInt(XmlUtils.java:123)
    at android.content.res.TypedArray.getInt(TypedArray.java:254)
    at android.widget.TextView.<init>(TextView.java:829)
    at android.widget.TextView.<init>(TextView.java:489)
    ... 42 more

我做错了什么，我该如何解决这个问题？

Answer 1

尝试创建themes.xml 文件并在其中添加以下行。

Themes.xml

<style name="Theme">
   <item name="item_shadowColor">@style/item_label</item>
</style>

attrs.xml
更改attrs.xml 文件中的format="reference"。

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <attr name="item_shadowColor" format="reference" />
</resources>

styles.xml

<style name="AppTheme.Main">     
    <item name="item_shadowColor">#000000</item>        
</style>

<style name="item_label">    
    <item name="android:shadowColor">#F240FF</item>        
</style>

然后在 TextView 中定义你的样式如下：

<TextView
    android:id="@id/title"
    style="@style/item_label"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"/>

Answer 2

问题已解决。我使用应用程序上下文创建适配器，当我将上下文更改为活动时，问题消失了。