java.lang.ClassNotFoundException android.support.v7.widget.RecyclerView$SavedState about viewpagerlayoutmanager HOT 12 OPEN

@nothinglhw
ClassNotFoundException 找不到类，跟是否实现onSaveInstanceState并没有关系,你看下你导的包有没有问题

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@leochuan 可以正常运行的，只是在fragment重启就会存在这个问题。

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这个问题的原因是SaveState是一个私有内部类，在以库形式引入且开启混淆的情况下会被修改类名，导致运行时无法找到这个类，解决办法是配置混淆不混淆这个类，或者直接改成一个外部类好了

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@moesama 感谢回复，不过好像不是这个原因，android自身的类是不参与混淆的

这是反编译后得到的SavedState部分的代码

  @RestrictTo({android.support.annotation.RestrictTo.Scope.LIBRARY_GROUP})
  public static class SavedState
    extends AbsSavedState
  {
    public static final Parcelable.Creator<SavedState> CREATOR = ParcelableCompat.newCreator(new ParcelableCompatCreatorCallbacks()
    {
      public RecyclerView.SavedState createFromParcel(Parcel paramAnonymousParcel, ClassLoader paramAnonymousClassLoader)
      {
        return new RecyclerView.SavedState(paramAnonymousParcel, paramAnonymousClassLoader);
      }
      
      public RecyclerView.SavedState[] newArray(int paramAnonymousInt)
      {
        return new RecyclerView.SavedState[paramAnonymousInt];
      }
    });
    Parcelable mLayoutState;
    
    SavedState(Parcel paramParcel, ClassLoader paramClassLoader)
    {
      super(paramClassLoader);
      if (paramClassLoader != null) {}
      for (;;)
      {
        this.mLayoutState = paramParcel.readParcelable(paramClassLoader);
        return;
        paramClassLoader = RecyclerView.LayoutManager.class.getClassLoader();
      }
    }
    
    SavedState(Parcelable paramParcelable)
    {
      super();
    }
    
    void copyFrom(SavedState paramSavedState)
    {
      this.mLayoutState = paramSavedState.mLayoutState;
    }
    
    public void writeToParcel(Parcel paramParcel, int paramInt)
    {
      super.writeToParcel(paramParcel, paramInt);
      paramParcel.writeParcelable(this.mLayoutState, 0);
    }
  }

from viewpagerlayoutmanager.

@leochuan 这个问题解决了么

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@frinda 你是有遇到嘛？

from viewpagerlayoutmanager.

是的，Class not found when unmarshalling: android.support.v7.widget.RecyclerView$SavedState
java.lang.ClassNotFoundException: android.support.v7.widget.RecyclerView$SavedState
at java.lang.Class.classForName(Native Method)
at java.lang.Class.forName(Class.java:400)
at android.os.Parcel.readParcelableCreator(Parcel.java:2489)
at android.os.Parcel.readParcelable(Parcel.java:2443)
at android.os.Parcel.readValue(Parcel.java:2346)
at android.os.Parcel.readSparseArrayInternal(Parcel.java:2779)
at android.os.Parcel.readSparseArray(Parcel.java:2049)
at android.os.Parcel.readValue(Parcel.java:2403)
at android.os.Parcel.readArrayMapInternal(Parcel.java:2698)
at android.os.BaseBundle.unparcel(BaseBundle.java:269)
at android.os.BaseBundle.putBoolean(BaseBundle.java:410)
at android.support.v4.app.Fragment.setUserVisibleHint(Fragment.java:960)
at android.support.v4.app.FragmentStatePagerAdapter.instantiateItem(FragmentStatePagerAdapter.java:121)
at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:1004)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1152)
at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:663)
at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:625)
at android.support.v4.view.ViewPager.setCurrentItem(ViewPager.java:606)
at android.support.design.widget.TabLayout$ViewPagerOnTabSelectedListener.onTabSelected(TabLayout.java:2170)
at android.support.design.widget.TabLayout.dispatchTabSelected(TabLayout.java:1165)
at android.support.design.widget.TabLayout.selectTab(TabLayout.java:1158)
at android.support.design.widget.TabLayout.selectTab(TabLayout.java:1128)
at android.support.design.widget.TabLayout$Tab.select(TabLayout.java:1427)
at android.support.design.widget.TabLayout$TabView.performClick(TabLayout.java:1537)
at android.view.View$PerformClick.run(View.java:22473)
at android.os.Handler.handleCallback(Handler.java:761)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:156)
at android.app.ActivityThread.main(ActivityThread.java:6523)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:942)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:832)
Caused by: java.lang.ClassNotFoundException: android.support.v7.widget.RecyclerView$SavedState
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:1346)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:1406)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
at java.lang.Class.classForName(Native Method) 
at java.lang.Class.forName(Class.java:400) 
at android.os.Parcel.readParcelableCreator(Parcel.java:2489) 
at android.os.Parcel.readParcelable(Parcel.java:2443) 
at android.os.Parcel.readValue(Parcel.java:2346) 
at android.os.Parcel.readSparseArrayInternal(Parcel.java:2779) 
at android.os.Parcel.readSparseArray(Parcel.java:2049) 
at android.os.Parcel.readValue(Parcel.java:2403) 
at android.os.Parcel.readArrayMapInternal(Parcel.java:2698) 
at android.os.BaseBundle.unparcel(BaseBundle.java:269) 
at android.os.BaseBundle.putBoolean(BaseBundle.java:410) 
at android.support.v4.app.Fragment.setUserVisibleHint(Fragment.java:960) 
at android.support.v4.app.FragmentStatePagerAdapter.instantiateItem(FragmentStatePagerAdapter.java:121) 
at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:1004) 
at android.support.v4.view.ViewPager.populate(ViewPager.java:1152) 
at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:663) 
at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:625) 
at android.support.v4.view.ViewPager.setCurrentItem(ViewPager.java:606) 
at android.support.design.widget.TabLayout$ViewPagerOnTabSelectedListener.onTabSelected(TabLayout.java:2170) 
at android.support.design.widget.TabLayout.dispatchTabSelected(TabLayout.java:1165) 
at android.support.design.widget.TabLayout.selectTab(TabLayout.java:1158) 
at android.support.design.widget.TabLayout.selectTab(TabLayout.java:1128) 
at android.support.design.widget.TabLayout$Tab.select(TabLayout.java:1427) 
at android.support.design.widget.TabLayout$TabView.performClick(TabLayout.java:1537) 
at android.view.View$PerformClick.run(View.java:22473) 
at android.os.Handler.handleCallback(Handler.java:761) 
at android.os.Handler.dispatchMessage(Handler.java:98) 
at android.os.Looper.loop(Looper.java:156) 
at android.app.ActivityThread.main(ActivityThread.java:6523) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:942) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:832) 
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available

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你用LinearLayoutManager看看是不是还会报错，顺便你用的RecyclerView的版本是多少？

from viewpagerlayoutmanager.

用的就是LinearLayoutManager，RecyclerView版本是27.1.0

from viewpagerlayoutmanager.

LinearLayoutManager是系统的LayoutManager啊，你确定和我的库有关嘛？你把我库的引用去掉再看看

from viewpagerlayoutmanager.

我没用你的库，就是碰到这个问题，Tablayout+ViewPager+FragmentStatePagerAdapter+RecyclerView用的这些技术

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@frinda
FragmentStatePagerAdapter 会保存状态，会调用onSaveInstance()不是必要的话你换成FragmentPagerAdapter
或者 xml 里给recyclerView 加上 android:saveEnabled="false" 试试

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