android设备拔掉IC读卡器，应用崩溃重启

Question

android设备中开发的应用使用了IC读卡器，在使用中发现拔掉读卡器后应用报错，异常重启，请问哪位知道如何解决？
错误日志：

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.mxjy.ssep, PID: 3431
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mxjy.ssep/com.mxjy.ssep.ui.personal.homePageActivity}: androidx.fragment.app.Fragment$InstantiationException: Unable to instantiate fragment com.mxjy.ssep.ui.fragment.SchoolLKProductListFragment: could not find Fragment constructor
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2778)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
        at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4699)
        at android.app.ActivityThread.-wrap18(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1595)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        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$MethodAndArgsCaller.run(RuntimeInit.java:438)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
     Caused by: androidx.fragment.app.Fragment$InstantiationException: Unable to instantiate fragment com.mxjy.ssep.ui.fragment.SchoolLKProductListFragment: could not find Fragment constructor
        at androidx.fragment.app.Fragment.instantiate(Fragment.java:628)
        at androidx.fragment.app.FragmentContainer.instantiate(FragmentContainer.java:57)
        at androidx.fragment.app.FragmentManager$3.instantiate(FragmentManager.java:483)
        at androidx.fragment.app.FragmentStateManager.<init>(FragmentStateManager.java:85)
        at androidx.fragment.app.FragmentManager.restoreSaveState(FragmentManager.java:2728)
        at androidx.fragment.app.FragmentController.restoreSaveState(FragmentController.java:198)
        at androidx.fragment.app.FragmentActivity$2.onContextAvailable(FragmentActivity.java:149)
        at androidx.activity.contextaware.ContextAwareHelper.dispatchOnContextAvailable(ContextAwareHelper.java:99)
        at androidx.activity.ComponentActivity.onCreate(ComponentActivity.java:297)
        at androidx.fragment.app.FragmentActivity.onCreate(FragmentActivity.java:273)
        at com.mxjy.ssep.ui.personal.homePageActivity.onCreate(homePageActivity.java:168)
        at android.app.Activity.performCreate(Activity.java:7036)
        at android.app.Activity.performCreate(Activity.java:7027)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2731)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856) 
        at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4699) 
        at android.app.ActivityThread.-wrap18(Unknown Source:0) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1595) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        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.NoSuchMethodException: <init> []
        at java.lang.Class.getConstructor0(Class.java:2320)
        at java.lang.Class.getConstructor(Class.java:1725)
        at androidx.fragment.app.Fragment.instantiate(Fragment.java:613)
        at androidx.fragment.app.FragmentContainer.instantiate(FragmentContainer.java:57) 
        at androidx.fragment.app.FragmentManager$3.instantiate(FragmentManager.java:483) 
        at androidx.fragment.app.FragmentStateManager.<init>(FragmentStateManager.java:85) 
        at androidx.fragment.app.FragmentManager.restoreSaveState(FragmentManager.java:2728) 
        at androidx.fragment.app.FragmentController.restoreSaveState(FragmentController.java:198) 
        at androidx.fragment.app.FragmentActivity$2.onContextAvailable(FragmentActivity.java:149) 
        at androidx.activity.contextaware.ContextAwareHelper.dispatchOnContextAvailable(ContextAwareHelper.java:99) 
        at androidx.activity.ComponentActivity.onCreate(ComponentActivity.java:297) 
        at androidx.fragment.app.FragmentActivity.onCreate(FragmentActivity.java:273) 
        at com.mxjy.ssep.ui.personal.homePageActivity.onCreate(homePageActivity.java:168) 
        at android.app.Activity.performCreate(Activity.java:7036) 
        at android.app.Activity.performCreate(Activity.java:7027) 
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214) 
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2731) 
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856) 
        at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4699) 
        at android.app.ActivityThread.-wrap18(Unknown Source:0) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1595) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        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) 

Answer 1

由于没有给fragment添加无参构造导致在生命周期中出现了异常，添加后解决