当我开始编写嵌套片段时，遇到了意外问题。当应用程序被Android杀死时，例如当有少量可用RAM时，应用程序将在恢复它后引发以下异常。
E/Parcel: Class not found when unmarshalling: android.support.design.widget.CoordinatorLayout$SavedState
java.lang.ClassNotFoundException: android.support.design.widget.CoordinatorLayout$SavedState
at java.lang.Class.classForName(Native Method)
at java.lang.Class.forName(Class.java:453)
at android.os.Parcel.readParcelableCreator(Parcel.java:2888)
at android.os.Parcel.readParcelable(Parcel.java:2842)
at android.os.Parcel.readValue(Parcel.java:2745)
at android.os.Parcel.readSparseArrayInternal(Parcel.java:3195)
at android.os.Parcel.readSparseArray(Parcel.java:2407)
at android.os.Parcel.readValue(Parcel.java:2802)
at android.os.Parcel.readArrayMapInternal(Parcel.java:3114)
at android.os.BaseBundle.initializeFromParcelLocked(BaseBundle.java:273)
at android.os.BaseBundle.unparcel(BaseBundle.java:226)
at android.os.BaseBundle.putBoolean(BaseBundle.java:532)
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:1186)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1086)
at android.support.v4.view.ViewPager$3.run(ViewPager.java:267)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:911)
at android.view.Choreographer.doCallbacks(Choreographer.java:723)
at android.view.Choreographer.doFrame(Choreographer.java:655)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:897)
at android.os.Handler.handleCallback(Handler.java:790)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: java.lang.ClassNotFoundException: android.support.design.widget.CoordinatorLayout$SavedState
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:1355)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:1415)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
at java.lang.Class.classForName(Native Method)
at java.lang.Class.forName(Class.java:453)
at android.os.Parcel.readParcelableCreator(Parcel.java:2888)
at android.os.Parcel.readParcelable(Parcel.java:2842)
at android.os.Parcel.readValue(Parcel.java:2745)
at android.os.Parcel.readSparseArrayInternal(Parcel.java:3195)
at android.os.Parcel.readSparseArray(Parcel.java:2407)
at android.os.Parcel.readValue(Parcel.java:2802)
at android.os.Parcel.readArrayMapInternal(Parcel.java:3114)
at android.os.BaseBundle.initializeFromParcelLocked(BaseBundle.java:273)
at android.os.BaseBundle.unparcel(BaseBundle.java:226)
at android.os.BaseBundle.putBoolean(BaseBundle.java:532)
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:1186)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1086)
at android.support.v4.view.ViewPager$3.run(ViewPager.java:267)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:911)
at android.view.Choreographer.doCallbacks(Choreographer.java:723)
at android.view.Choreographer.doFrame(Choreographer.java:655)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:897)
at android.os.Handler.handleCallback(Handler.java:790)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available
android.os.BadParcelableException: ClassNotFoundException when unmarshalling: android.support.design.widget.CoordinatorLayout$SavedState
at android.os.Parcel.readParcelableCreator(Parcel.java:2916)
at android.os.Parcel.readParcelable(Parcel.java:2842)
at android.os.Parcel.readValue(Parcel.java:2745)
at android.os.Parcel.readSparseArrayInternal(Parcel.java:3195)
at android.os.Parcel.readSparseArray(Parcel.java:2407)
at android.os.Parcel.readValue(Parcel.java:2802)
at android.os.Parcel.readArrayMapInternal(Parcel.java:3114)
at android.os.BaseBundle.initializeFromParcelLocked(BaseBundle.java:273)
at android.os.BaseBundle.unparcel(BaseBundle.java:226)
at android.os.BaseBundle.putBoolean(BaseBundle.java:532)
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:1186)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1086)
at android.support.v4.view.ViewPager$3.run(ViewPager.java:267)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:911)
at android.view.Choreographer.doCallbacks(Choreographer.java:723)
at android.view.Choreographer.doFrame(Choreographer.java:655)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:897)
at android.os.Handler.handleCallback(Handler.java:790)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
仅当在XML android ID中分配了标签片段中的RecyclerView或CoordinatorLayout时，才会发生此错误。
为了识别错误，我编写了一个应用程序，并在其中复制了该错误。
https://github.com/RicomenPL/SampleBPE
如何复制它？
在智能手机或仿真器的开发选项中启用“不要保留活动”
打开SampleBPE应用程序
向左或向右移动至标签
现在您必须按Home键离开
使用最近的应用程序密钥再次输入
向左或向右移动标签会导致错误
最佳答案
当我将支持库降级到26.1.0版时，此问题已解决。这是一个临时解决方案，可以避免此问题。我希望在版本28中可以解决此问题。