无法实例化片段com.swmansion.rnscreens.Screen [英] Unable to instantiate fragment com.swmansion.rnscreens.Screen

问题描述

我一直在使用React Native 0.60.4开发适用于android和ios的应用程序，最近我发现将应用程序置于分屏或自由形式模式(因为它是屏幕上唯一的应用程序)有时会导致它碰撞.

I have been developing an app for android and ios using React Native 0.60.4, and just recently I discovered that putting the app in split-screen or freeform mode (from being the only app on the screen) sometimes causes it to crash.

我进一步研究了这个问题，发现我可以毫无问题地将应用程序启动到分屏或自由形式模式，但是有时调整它的大小会导致它崩溃.以下是我在Android Studio中调试器实例的输出，我在努力了解这些信息:

I played with this further and found that I can launch the app into split screen or freeform mode with no problem, but sometimes resizing it will cause it to crash. Below is the output from my debugger instance in Android Studio, which I'm struggling to make sense of:

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.myApp, PID: 32150
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.myApp/com.myApp.MainActivity}: androidx.fragment.app.Fragment$InstantiationException: Unable to instantiate fragment com.swmansion.rnscreens.Screen$ScreenFragment: calling Fragment constructor caused an exception
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3270)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
        at android.app.ActivityThread.handleRelaunchActivityInner(ActivityThread.java:5279)
        at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:5187)
        at android.app.servertransaction.ActivityRelaunchItem.execute(ActivityRelaunchItem.java:69)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
        at android.os.Handler.dispatchMessage(Handler.java:107)
        at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7356)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
     Caused by: androidx.fragment.app.Fragment$InstantiationException: Unable to instantiate fragment com.swmansion.rnscreens.Screen$ScreenFragment: calling Fragment constructor caused an exception
        at androidx.fragment.app.Fragment.instantiate(Fragment.java:465)
        at androidx.fragment.app.FragmentContainer.instantiate(FragmentContainer.java:50)
        at androidx.fragment.app.FragmentState.instantiate(FragmentState.java:80)
        at androidx.fragment.app.FragmentManagerImpl.restoreAllState(FragmentManager.java:3109)
        at androidx.fragment.app.FragmentController.restoreAllState(FragmentController.java:158)
        at androidx.fragment.app.FragmentActivity.onCreate(FragmentActivity.java:344)
        at androidx.appcompat.app.AppCompatActivity.onCreate(AppCompatActivity.java:85)
        at com.facebook.react.ReactActivity.onCreate(ReactActivity.java:51)
        at android.app.Activity.performCreate(Activity.java:7802)
        at android.app.Activity.performCreate(Activity.java:7791)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1299)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3245)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409) 
        at android.app.ActivityThread.handleRelaunchActivityInner(ActivityThread.java:5279) 
        at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:5187) 
        at android.app.servertransaction.ActivityRelaunchItem.execute(ActivityRelaunchItem.java:69) 
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016) 
        at android.os.Handler.dispatchMessage(Handler.java:107) 
        at android.os.Looper.loop(Looper.java:214) 
        at android.app.ActivityThread.main(ActivityThread.java:7356) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930) 
     Caused by: java.lang.reflect.InvocationTargetException
        at java.lang.reflect.Constructor.newInstance0(Native Method)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:343)
        at androidx.fragment.app.Fragment.instantiate(Fragment.java:443)
        at androidx.fragment.app.FragmentContainer.instantiate(FragmentContainer.java:50) 
        at androidx.fragment.app.FragmentState.instantiate(FragmentState.java:80) 
        at androidx.fragment.app.FragmentManagerImpl.restoreAllState(FragmentManager.java:3109) 
        at androidx.fragment.app.FragmentController.restoreAllState(FragmentController.java:158) 
        at androidx.fragment.app.FragmentActivity.onCreate(FragmentActivity.java:344) 
        at androidx.appcompat.app.AppCompatActivity.onCreate(AppCompatActivity.java:85) 
        at com.facebook.react.ReactActivity.onCreate(ReactActivity.java:51) 
        at android.app.Activity.performCreate(Activity.java:7802) 
        at android.app.Activity.performCreate(Activity.java:7791) 
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1299) 
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3245) 
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409) 
        at android.app.ActivityThread.handleRelaunchActivityInner(ActivityThread.java:5279) 
        at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:5187) 
        at android.app.servertransaction.ActivityRelaunchItem.execute(ActivityRelaunchItem.java:69) 
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016) 
        at android.os.Handler.dispatchMessage(Handler.java:107) 
        at android.os.Looper.loop(Looper.java:214) 
        at android.app.ActivityThread.main(ActivityThread.java:7356) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930) 
     Caused by: java.lang.IllegalStateException: Screen fragments should never be restored
        at com.swmansion.rnscreens.Screen$ScreenFragment.<init>(Screen.java:24)
        at java.lang.reflect.Constructor.newInstance0(Native Method) 
        at java.lang.reflect.Constructor.newInstance(Constructor.java:343) 
        at androidx.fragment.app.Fragment.instantiate(Fragment.java:443) 
        at androidx.fragment.app.FragmentContainer.instantiate(FragmentContainer.java:50) 
        at androidx.fragment.app.FragmentState.instantiate(FragmentState.java:80) 
        at androidx.fragment.app.FragmentManagerImpl.restoreAllState(FragmentManager.java:3109) 
        at androidx.fragment.app.FragmentController.restoreAllState(FragmentController.java:158) 
        at androidx.fragment.app.FragmentActivity.onCreate(FragmentActivity.java:344) 
        at androidx.appcompat.app.AppCompatActivity.onCreate(AppCompatActivity.java:85) 
        at com.facebook.react.ReactActivity.onCreate(ReactActivity.java:51) 
        at android.app.Activity.performCreate(Activity.java:7802) 
        at android.app.Activity.performCreate(Activity.java:7791) 
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1299) 
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3245) 
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409) 
        at android.app.ActivityThread.handleRelaunchActivityInner(ActivityThread.java:5279) 
        at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:5187) 
        at android.app.servertransaction.ActivityRelaunchItem.execute(ActivityRelaunchItem.java:69) 
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016) 
        at android.os.Handler.dispatchMessage(Handler.java:107) 
        at android.os.Looper.loop(Looper.java:214) 
        at android.app.ActivityThread.main(ActivityThread.java:7356) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930) 

推荐答案

将此添加到您的MainActivity.java

Add this to your MainActivity.java

@Override
    protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(null);
   }

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