FragmentHostCallback.getContext() 上的 NullPointerException

Question

我在通过导航图文件中声明的深层链接导航到片段时遇到了这种随机崩溃。我在我的项目中使用导航组件库。

堆栈跟踪：

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Context androidx.fragment.app.FragmentHostCallback.getContext()' on a null object reference
   at androidx.fragment.app.FragmentLifecycleCallbacksDispatcher.dispatchOnFragmentPreAttached(FragmentLifecycleCallbacksDispatcher.java:91)
   at androidx.fragment.app.FragmentLifecycleCallbacksDispatcher.dispatchOnFragmentPreAttached(FragmentLifecycleCallbacksDispatcher.java:96)
   at androidx.fragment.app.FragmentStateManager.attach(FragmentStateManager.java:463)
   at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:275)
   at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:2189)
   at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:2106)
   at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:2002)
   at androidx.fragment.app.FragmentManager$5.run(FragmentManager.java:524)
   at android.os.Handler.handleCallback(Handler.java:938)
   at android.os.Handler.dispatchMessage(Handler.java:99)
   at android.os.Looper.loop(Looper.java:223)
   at android.app.ActivityThread.main(ActivityThread.java:7698)
   at java.lang.reflect.Method.invoke(Method.java)
   at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:952)

Answer 1

super.onCreate(savedInstanceState)我在 Activity 的 onCreate 中丢失了。超级烦人的是错误描述不更具体。