小编H. *_*lba的帖子

有时，我的应用程序打开时会发生崩溃：

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.appcompat.widget.ContentFrameLayout.setDecorPadding(int, int, int, int)' on a null object reference
       at androidx.appcompat.app.AppCompatDelegateImpl.applyFixedSizeWindow(AppCompatDelegateImpl.java:1026)
       at androidx.appcompat.app.AppCompatDelegateImpl.ensureSubDecor(AppCompatDelegateImpl.java:820)
       at androidx.appcompat.app.AppCompatDelegateImpl.onPostCreate(AppCompatDelegateImpl.java:527)
       at androidx.appcompat.app.AppCompatActivity.onPostCreate(AppCompatActivity.java:127)
       at android.app.Instrumentation.callActivityOnPostCreate(Instrumentation.java:1381)
       at android.app.ActivityThread.handleStartActivity(ActivityThread.java:3499)
       at android.app.servertransaction.TransactionExecutor.performLifecycleSequence(TransactionExecutor.java:221)
       at android.app.servertransaction.TransactionExecutor.cycleToPath(TransactionExecutor.java:201)
       at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:173)
       at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2147)
       at android.os.Handler.dispatchMessage(Handler.java:107)
       at android.os.Looper.loop(Looper.java:237)
       at android.app.ActivityThread.main(ActivityThread.java:7814)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1075)

正如您所看到的，堆栈跟踪中没有引用我的代码中的某些内容，因此因此我无法找出问题所在。这次事故的原因可能是什么？