android – FragmentManager在Kotlin中抛出IllegalArgumentException

概述我的片段中有以下方法 override fun onActivityCreated(savedInstanceState: Bundle?) { super.onActivityCreated(savedInstanceState) val fm = childFragmentManager var prefsFragment: PrefsFragment? = fm.f 我的片段中有以下方法

overrIDe fun onActivityCreated(savedInstanceState: Bundle?) {    super.onActivityCreated(savedInstanceState)    val fm = childFragmentManager    var prefsFragment: PrefsFragment? = fm.findFragmentByTag(tablename) as PrefsFragment?    if (prefsFragment == null) {        prefsFragment = PrefsFragment()        val ft = fm.beginTransaction()        ft.add(R.ID.parameters_fragment_container,prefsFragment,tablename)        ft.commit()        fm.executePendingTransactions()    }}

我不得不说这是Java-> Kotlin自动翻译器对我以前的Java代码所做的事情(除了我在标签上找到PrefsFragment的行末尾的？),所以它可能不完全是犹太教.我正在学习Kotlin.

现在,当我调用executePendingTransactions()时,我的应用程序崩溃抛出java.lang.IllegalArgumentException,并显示错误消息“参数指定为非null为null：方法kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull,参数savedInstanceState”.现在,是的,savedInstanceState实际上是null,但它与显然抛出异常的调用有什么关系呢？我确保没有其他值/变量为空,所以我相信错误信息……但为什么呢？

编辑这是堆栈跟踪,以及让我做恶梦的源代码

https://gist.github.com/Morpheu5/8ec7e2064f53679405769b43c64f2cb7

E/AndroIDRuntime: FATAL EXCEPTION: main                  Process: net.morpheu5.bleedingscorecalculator,PID: 2685                  java.lang.IllegalArgumentException: Parameter specifIEd as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull,parameter savedInstanceState                      at net.morpheu5.bleedingscorecalculator.CalculatorScreen$PrefsFragment.onCreatePreferences(CalculatorScreen.kt:0)                      at androID.support.v7.preference.PreferenceFragmentCompat.onCreate(PreferenceFragmentCompat.java:223)                      at androID.support.v4.app.Fragment.performCreate(Fragment.java:2075)                      at androID.support.v4.app.FragmentManagerImpl.movetoState(FragmentManager.java:1060)                      at androID.support.v4.app.BackStackRecord.setLastIn(BackStackRecord.java:838)                      at androID.support.v4.app.BackStackRecord.calculateFragments(BackStackRecord.java:861)                      at androID.support.v4.app.BackStackRecord.run(BackStackRecord.java:719)                      at androID.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1682)                      at androID.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:594)                      at net.morpheu5.bleedingscorecalculator.CalculatorScreen.onActivityCreated(CalculatorScreen.kt:34)                      at androID.support.v4.app.Fragment.performActivityCreated(Fragment.java:2096)                      at androID.support.v4.app.FragmentManagerImpl.movetoState(FragmentManager.java:1138)                      at androID.support.v4.app.FragmentManagerImpl.movetoState(FragmentManager.java:1295)                      at androID.support.v4.app.BackStackRecord.run(BackStackRecord.java:801)                      at androID.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:1643)                      at androID.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:679)                      at androID.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:143)                      at androID.support.v4.vIEw.VIEwPager.populate(VIEwPager.java:1272)                      at androID.support.v4.vIEw.VIEwPager.populate(VIEwPager.java:1120)                      at androID.support.v4.vIEw.VIEwPager.onMeasure(VIEwPager.java:1646)                      at androID.vIEw.VIEw.measure(VIEw.java:19857)                      at androID.vIEw.VIEwGroup.measureChilDWithmargins(VIEwGroup.java:6083)                      at androID.support.design.Widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:703)                      at androID.support.design.Widget.headerScrollingVIEwBehavior.onMeasureChild(headerScrollingVIEwBehavior.java:90)                      at androID.support.design.Widget.AppbarLayout$ScrollingVIEwBehavior.onMeasureChild(AppbarLayout.java:1367)                      at androID.support.design.Widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:768)                      at androID.vIEw.VIEw.measure(VIEw.java:19857)                      at androID.vIEw.VIEwGroup.measureChilDWithmargins(VIEwGroup.java:6083)                      at androID.Widget.FrameLayout.onMeasure(FrameLayout.java:185)                      at androID.support.v7.Widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:139)                      at androID.vIEw.VIEw.measure(VIEw.java:19857)                      at androID.vIEw.VIEwGroup.measureChilDWithmargins(VIEwGroup.java:6083)                      at androID.Widget.linearLayout.measureChildBeforeLayout(linearLayout.java:1464)                      at androID.Widget.linearLayout.measureVertical(linearLayout.java:758)                      at androID.Widget.linearLayout.onMeasure(linearLayout.java:640)                      at androID.vIEw.VIEw.measure(VIEw.java:19857)                      at androID.vIEw.VIEwGroup.measureChilDWithmargins(VIEwGroup.java:6083)                      at androID.Widget.FrameLayout.onMeasure(FrameLayout.java:185)                      at androID.vIEw.VIEw.measure(VIEw.java:19857)                      at androID.vIEw.VIEwGroup.measureChilDWithmargins(VIEwGroup.java:6083)                      at androID.Widget.linearLayout.measureChildBeforeLayout(linearLayout.java:1464)                      at androID.Widget.linearLayout.measureVertical(linearLayout.java:758)                      at androID.Widget.linearLayout.onMeasure(linearLayout.java:640)                      at androID.vIEw.VIEw.measure(VIEw.java:19857)                      at androID.vIEw.VIEwGroup.measureChilDWithmargins(VIEwGroup.java:6083)                      at androID.Widget.FrameLayout.onMeasure(FrameLayout.java:185)                      at com.androID.internal.policy.DecorVIEw.onMeasure(DecorVIEw.java:689)                      at androID.vIEw.VIEw.measure(VIEw.java:19857)                      at androID.vIEw.VIEwRootImpl.performMeasure(VIEwRootImpl.java:2275)E/AndroIDRuntime:     at androID.vIEw.VIEwRootImpl.measureHIErarchy(VIEwRootImpl.java:1366)                      at androID.vIEw.VIEwRootImpl.performTraversals(VIEwRootImpl.java:1619)                      at androID.vIEw.VIEwRootImpl.doTraversal(VIEwRootImpl.java:1254)                      at androID.vIEw.VIEwRootImpl$TraversalRunnable.run(VIEwRootImpl.java:6337)                      at androID.vIEw.Choreographer$CallbackRecord.run(Choreographer.java:874)                      at androID.vIEw.Choreographer.doCallbacks(Choreographer.java:686)                      at androID.vIEw.Choreographer.doFrame(Choreographer.java:621)                      at androID.vIEw.Choreographer$FramedisplayEventReceiver.run(Choreographer.java:860)                      at androID.os.Handler.handleCallback(Handler.java:751)                      at androID.os.Handler.dispatchMessage(Handler.java:95)                      at androID.os.Looper.loop(Looper.java:154)                      at androID.app.ActivityThread.main(ActivityThread.java:6119)                      at java.lang.reflect.Method.invoke(Native Method)                      at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)                      at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:776)

解决方法 该异常实际上并非来自该代码.它来自您的CalculatorScreen.PrefsFragment.onCreatePreferences()方法.如果你看那里,看起来像 –

覆盖fun onCreatePreferences(savedInstanceState：Bundle,rootKey：String)

并且它应该是以下允许savedInstanceState为null –

覆盖fun onCreatePreferences(savedInstanceState：Bundle？,rootKey：String)

总结

以上是内存溢出为你收集整理的android – FragmentManager在Kotlin中抛出IllegalArgumentException全部内容，希望文章能够帮你解决android – FragmentManager在Kotlin中抛出IllegalArgumentException所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。