Come fare riferimento a un attributo del tema in uno stile?

Question

Ho un problema seguente. Voglio personalizzare l'aspetto della riga in un elenco, ma durante il gonfiaggio viene generata un'eccezione.

pezzo di codice in style.xml

<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> 

E l'eccezione

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 

Cosa sto facendo male e come posso risolvere questo problema?

Answer 1

Il problema è stato risolto. Ho usato il contesto dell'applicazione per creare l'adattatore, quando ho cambiato contesto ad attività il problema è scomparso.

Answer 2

Provare a creare il file themes.xml e aggiungere le righe sottostanti in esso.

Themes.xml

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

attrs.xml
cambiare gli format="reference" nel file attrs.xml.

<?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> 

Poi, dopo Definisci il tuo stile al TextView come di seguito:

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