错误处理Class not found when unmarshalling: android.support.v4.app.FragmentManagerState

雨点打透心脏的1/2处 2023-02-26 15:22 7阅读 0赞

一开始谷歌找遍了全网 , 直接搜这个报错貌似没有解决方法 T\_T  
希望这篇文章能够帮到各位啦.  
解决方法拉到文末.

报错日志:

E/Parcel: Class not found when unmarshalling: android.support.v4.app.FragmentManagerState
        java.lang.ClassNotFoundException: android.support.v4.app.FragmentManagerState
            at java.lang.Class.classForName(Native Method)
            at java.lang.Class.forName(Class.java:309)
            at android.os.Parcel.readParcelableCreator(Parcel.java:2281)
            at android.os.Parcel.readParcelable(Parcel.java:2245)
            at android.os.Parcel.readValue(Parcel.java:2152)
            at android.os.Parcel.readArrayMapInternal(Parcel.java:2485)
            at android.os.BaseBundle.unparcel(BaseBundle.java:221)
            at android.os.Bundle.getParcelable(Bundle.java:755)
            at android.app.Activity.onCreate(Activity.java:932)  //可以看到是在onCreate的时候,进行恢复操作,导致Exception
            at android.app.Activity.performCreate(Activity.java:5990)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
            at com.duowan.gamecenter.pluginlib.a.abk.callActivityOnCreate(DelegateInstrumentation.java:239)
            at com.duowan.gamecenter.pluginlib.environment.abo.callActivityOnCreate(PluginInstrumentation.java:162)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
            at android.app.ActivityThread.access$800(ActivityThread.java:151)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5254)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700)

背景:  
项目中的Activity是基于FragmentActivity, 当手机/模拟器的内存不足时(日志:E/History: low memory), 后台的活动被回收 ,只保留任务栈,再次进入的时候, Activity尝试恢复 , 出现该崩溃 .

FragmentActivity的onSaveInstanceState源码:

protected void onSaveInstanceState(Bundle outState) {
            super.onSaveInstanceState(outState);
            this.markFragmentsCreated();
            Parcelable p = this.mFragments.saveAllState();
            if (p != null) {
                outState.putParcelable("android:support:fragments", p);
            }
    
            if (this.mPendingFragmentActivityResults.size() > 0) {
                outState.putInt("android:support:next_request_index", this.mNextCandidateRequestIndex);
                int[] requestCodes = new int[this.mPendingFragmentActivityResults.size()];
                String[] fragmentWhos = new String[this.mPendingFragmentActivityResults.size()];
    
                for(int i = 0; i < this.mPendingFragmentActivityResults.size(); ++i) {
                    requestCodes[i] = this.mPendingFragmentActivityResults.keyAt(i);
                    fragmentWhos[i] = (String)this.mPendingFragmentActivityResults.valueAt(i);
                }
    
                outState.putIntArray("android:support:request_indicies", requestCodes);
                outState.putStringArray("android:support:request_fragment_who", fragmentWhos);
            }
        }

恢复的时候 , 会在super.onCreate(savedInstanceState);尝试恢复 , 导致出现本文的错误:Class not found when unmarshalling: android.support.v4.app.FragmentManagerState

解决思路就是处理savedInstanceState,不让它恢复android:support:fragments的内容.

解决方法如下:

在activity的onCreate移除掉Bundle 里的fragments

@Override
        public void onCreate(Bundle savedInstanceState) {
            if (savedInstanceState != null) {
                savedInstanceState.remove("android:support:fragments");
            }
            super.onCreate(savedInstanceState);
        }

转：[https://blog.csdn.net/hecate1994/article/details/100126101][https_blog.csdn.net_hecate1994_article_details_100126101]

[https_blog.csdn.net_hecate1994_article_details_100126101]: https://blog.csdn.net/hecate1994/article/details/100126101