v7 support 23.0.1 crash: AppCompatButton.setBackgr

Question

I am experiencing this crash, with support library 23.0.1

It happens when showing a Dialog Fragment.

It verifies with both android.support.v4.app.DialogFragment and android.support.v7.app.AppCompatDialogFragment

Anyone else is experiencing this?

It always happens with release compilation (which has Proguard enabled), and only in some cases with debug compilation.

I am reporting the crash stacks for both fragment classes.

stack for android.support.v4.app.DialogFragment:

android.view.InflateException: Binary XML file line #115: Error inflating class Button
       at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:763)
       at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
       at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)
       at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
       at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
       at android.view.LayoutInflater.inflate(LayoutInflater.java:365)
       at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:378)
       at com.android.internal.app.AlertController.installContent(AlertController.java:235)
       at android.app.AlertDialog.onCreate(AlertDialog.java:356)
       at android.app.Dialog.dispatchOnCreate(Dialog.java:373)
       at android.app.Dialog.show(Dialog.java:274)
       at android.support.v4.app.DialogFragment.onStart(SourceFile:406)
       at android.support.v4.app.FragmentManagerImpl.moveToState(SourceFile:1060)
       at android.support.v4.app.FragmentManagerImpl.moveToState(SourceFile:1207)
       at android.support.v4.app.BackStackRecord.run(SourceFile:738)
       at android.support.v4.app.FragmentManagerImpl.execPendingActions(SourceFile:1572)
       at android.support.v4.app.FragmentManagerImpl$1.run(SourceFile:493)
       at android.os.Handler.handleCallback(Handler.java:739)
       at android.os.Handler.dispatchMessage(Handler.java:95)
       at android.os.Looper.loop(Looper.java:135)
       at android.app.ActivityThread.main(ActivityThread.java:5254)
       at java.lang.reflect.Method.invoke(Method.java)
       at java.lang.reflect.Method.invoke(Method.java:372)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.o.a()' on a null object reference
       at android.support.v7.widget.AppCompatButton.setBackgroundDrawable(SourceFile:85)
       at android.view.View.setBackground(View.java:16226)
       at android.view.View.(View.java:4103)
       at android.widget.TextView.(TextView.java:637)
       at android.widget.Button.(Button.java:111)
       at android.widget.Button.(Button.java:107)
       at android.support.v7.widget.AppCompatButton.(SourceFile:64)
       at android.support.v7.widget.AppCompatButton.(SourceFile:60)
       at android.support.v7.internal.app.AppCompatViewInflater.createView(SourceFile:101)
       at android.support.v7.app.AppCompatDelegateImplV7.onCreateView(SourceFile:966)
       at android.support.v4.view.LayoutInflaterCompatHC$FactoryWrapperHC.onCreateView(SourceFile:44)
       at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:725)
       at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
       at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)
       at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
       at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
       at android.view.LayoutInflater.inflate(LayoutInflater.java:365)
       at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:378)
       at com.android.internal.app.AlertController.installContent(AlertController.java:235)
       at android.app.AlertDialog.onCreate(AlertDialog.java:356)
       at android.app.Dialog.dispatchOnCreate(Dialog.java:373)
       at android.app.Dialog.show(Dialog.java:274)
       at android.support.v4.app.DialogFragment.onStart(SourceFile:406)
       at android.support.v4.app.FragmentManagerImpl.moveToState(SourceFile:1060)
       at android.support.v4.app.FragmentManagerImpl.moveToState(SourceFile:1207)
       at android.support.v4.app.BackStackRecord.run(SourceFile:738)
       at android.support.v4.app.FragmentManagerImpl.execPendingActions(SourceFile:1572)
       at android.support.v4.app.FragmentManagerImpl$1.run(SourceFile:493)
       at android.os.Handler.handleCallback(Handler.java:739)
       at android.os.Handler.dispatchMessage(Handler.java:95)
       at android.os.Looper.loop(Looper.java:135)
       at android.app.ActivityThread.main(ActivityThread.java:5254)
       at java.lang.reflect.Method.invoke(Method.java)
       at java.lang.reflect.Method.invoke(Method.java:372)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

stack for android.support.v7.app.AppCompatDialogFragment:

android.view.InflateException: Binary XML file line #29: Error inflating class Button
       at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:763)
       at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
       at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)
       at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
       at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
       at eu.baroncelli.oraritrenitalia.mainactivity.AlertDialogFragment.onCreateView(SourceFile:62)
       at android.support.v4.app.Fragment.performCreateView(SourceFile:1962)
       at android.support.v4.app.FragmentManagerImpl.moveToState(SourceFile:1026)
       at android.support.v4.app.FragmentManagerImpl.moveToState(SourceFile:1207)
       at android.support.v4.app.BackStackRecord.run(SourceFile:738)
       at android.support.v4.app.FragmentManagerImpl.execPendingActions(SourceFile:1572)
       at android.support.v4.app.FragmentManagerImpl$1.run(SourceFile:493)
       at android.os.Handler.handleCallback(Handler.java:739)
       at android.os.Handler.dispatchMessage(Handler.java:95)
       at android.os.Looper.loop(Looper.java:135)
       at android.app.ActivityThread.main(ActivityThread.java:5254)
       at java.lang.reflect.Method.invoke(Method.java)
       at java.lang.reflect.Method.invoke(Method.java:372)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.o.a()' on a null object reference
       at android.support.v7.widget.AppCompatButton.setBackgroundDrawable(SourceFile:85)
       at android.view.View.setBackground(View.java:16226)
       at android.view.View.(View.java:4103)
       at android.widget.TextView.(TextView.java:637)
       at android.widget.Button.(Button.java:111)
       at android.widget.Button.(Button.java:107)
       at android.support.v7.widget.AppCompatButton.(SourceFile:64)
       at android.support.v7.widget.AppCompatButton.(SourceFile:60)
       at android.support.v7.internal.app.AppCompatViewInflater.createView(SourceFile:101)
       at android.support.v7.app.AppCompatDelegateImplV7.onCreateView(SourceFile:966)
       at android.support.v4.view.LayoutInflaterCompatHC$FactoryWrapperHC.onCreateView(SourceFile:44)
       at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:725)
       at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
       at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)
       at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
       at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
       at eu.baroncelli.oraritrenitalia.mainactivity.AlertDialogFragment.onCreateView(SourceFile:62)
       at android.support.v4.app.Fragment.performCreateView(SourceFile:1962)
       at android.support.v4.app.FragmentManagerImpl.moveToState(SourceFile:1026)
       at android.support.v4.app.FragmentManagerImpl.moveToState(SourceFile:1207)
       at android.support.v4.app.BackStackRecord.run(SourceFile:738)
       at android.support.v4.app.FragmentManagerImpl.execPendingActions(SourceFile:1572)
       at android.support.v4.app.FragmentManagerImpl$1.run(SourceFile:493)
       at android.os.Handler.handleCallback(Handler.java:739)
       at android.os.Handler.dispatchMessage(Handler.java:95)
       at android.os.Looper.loop(Looper.java:135)
       at android.app.ActivityThread.main(ActivityThread.java:5254)
       at java.lang.reflect.Method.invoke(Method.java)
       at java.lang.reflect.Method.invoke(Method.java:372)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

Answer 1

According to this your proguard setup should contain the following rules if you're using appcompat-v7:

-keep public class android.support.v7.widget.** { *; }
-keep public class android.support.v7.internal.widget.** { *; }
-keep public class android.support.v7.internal.view.menu.** { *; }

-keep public class * extends android.support.v4.view.ActionProvider {
    public <init>(android.content.Context);
}

This will also save you from trouble when using SearchView and other things I imagine.