android - Using <include> tag with ?attr/myAttr -


i'm trying include different layouts in view depending on parent theme.

following idea:

attrs.xml

<attr name="themelayout" format="reference" />

styles.xml

<style name="apptheme" parent="theme.appcompat.light.darkactionbar">     <item name="themelayout">@layout/layout_a</item> </style>  <style name="appthemesecond" parent="theme.appcompat.light.darkactionbar">     <item name="themelayout">@layout/layout_b</item> </style>

activity.xml

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     tools:context=".mainactivity">      <include layout="?attr/themelayout" />  </relativelayout>

when run code above i'll following exception:

java.lang.runtimeexception: unable start activity componentinfo{com.my.package/com.my.package.mainactivity}: android.view.inflateexception: must specifiy valid layout reference. layout id ?attr/themelayout not valid.             @ android.app.activitythread.performlaunchactivity(activitythread.java:2325)             @ android.app.activitythread.handlelaunchactivity(activitythread.java:2387)             @ android.app.activitythread.access$800(activitythread.java:151)             @ android.app.activitythread$h.handlemessage(activitythread.java:1303)             @ android.os.handler.dispatchmessage(handler.java:102)             @ android.os.looper.loop(looper.java:135)             @ android.app.activitythread.main(activitythread.java:5254)             @ java.lang.reflect.method.invoke(native method)             @ java.lang.reflect.method.invoke(method.java:372)             @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:903)             @ com.android.internal.os.zygoteinit.main(zygoteinit.java:698)      caused by: android.view.inflateexception: must specifiy valid layout reference. layout id ?attr/themelayout not valid.             @ android.view.layoutinflater.parseinclude(layoutinflater.java:866)

what doing wrong? possible @ all?

note #1: set theme of mainactivity android:theme="@style/apptheme"

note #2: in design-view of layout editor works expected. if switch theme, include gets updated properly.
see following screenshots well:

preview design tab android studio

unfortunately not possible idea. have tracked flow of layoutinflater , requieres layout attribute typedvalue.type_reference means ?attr not allowed. left comment in method explain.

public int getattributeresourcevalue(int idx, int defaultvalue) {     int t = nativegetattributedatatype(mparsestate, idx);     // note: don't attempt convert other types, because     // want count on aapt doing conversion us.     if (t == typedvalue.type_reference) {         return nativegetattributedata(mparsestate, idx);     }     return defaultvalue; }

android.content.res.xmlblock.java:385

basically have done nothing wrong -- inflation in preview works differently caused confusion.


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