我的应用程序遇到了很多崩溃，我无法复制这些崩溃中的任何一个，甚至无法使用Crashlytics生成的崩溃报告进行追溯。
这是一种情况:
class ColumnDisplayFragment : BaseFragment() {
private lateinit var viewModelType: ColumnDetailViewModelType
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
setHasOptionsMenu(true)
showBackButton(true)
setActionBarTitle(viewModelType.title)
recyclerView.apply {
layoutManager = LinearLayoutManager(context)
setHasFixedSize(true)
adapter = ColumnDetailAdapter(viewModelType)
}
}
companion object {
fun newInstance(viewModelType: ColumnDetailViewModelType) = ColumnDetailFragment().apply {
this.viewModelType = viewModelType
}
}
}
这就是我创建片段的方式:
ColumnDetailFragment.newInstance(viewModelType)
我的ViewModelType:
interface ColumnDetailViewModelType: Serializable {
val columns: List<Column>
val title: String
val clickableColumns: List<Column>
val chartButtons: List<ButtonType>
val menu: Int
val itemSelected: BehaviorSubject<Column>
val buttonModel: DetailColumnButtonCell.DetailColumnButtonModel
val showFragmentObservable: Observable<ShowDetailFragment>
val showPopUps: Observable<ShowPopDetailUp>
fun bindCloseButton(clicks: Observable<Unit>)
fun onMenuItemSelected(item: Int)
}
但是，在某处， viewModelType 丢失了，并导致崩溃。
这是Crashlytics中生成的崩溃报告:
Fatal Exception: kotlin.UninitializedPropertyAccessException: lateinit property viewModelType has not been initialized
at com.app.android.traderpro.etx.fragments.columnDetailFragments.ColumnDetailFragment.onViewCreated(ColumnDetailFragment.java:51)
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:892)
at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManagerImpl.java:1238)
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:1303)
at androidx.fragment.app.BackStackRecord.executePopOps(BackStackRecord.java:500)
at androidx.fragment.app.FragmentManagerImpl.executeOps(FragmentManagerImpl.java:2076)
at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManagerImpl.java:1869)
at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManagerImpl.java:1824)
at androidx.fragment.app.FragmentManagerImpl.popBackStackImmediate(FragmentManagerImpl.java:310)
at androidx.fragment.app.FragmentManagerImpl.popBackStackImmediate(FragmentManagerImpl.java:253)
at androidx.fragment.app.FragmentManagerImpl.handleOnBackPressed(FragmentManagerImpl.java:233)
at androidx.fragment.app.FragmentManagerImpl$1.handleOnBackPressed(FragmentManagerImpl.java:108)
at androidx.activity.OnBackPressedDispatcher.onBackPressed(OnBackPressedDispatcher.java:189)
at androidx.activity.ComponentActivity.onBackPressed(ComponentActivity.java:286)
at com.app.android.traderpro.etx.activities.homeActivity.HomeActivity.onBackPressed(HomeActivity.java:202)
at android.app.Activity.onKeyUp(Activity.java:3756)
at android.view.KeyEvent.dispatch(KeyEvent.java:2949)
at android.app.Activity.dispatchKeyEvent(Activity.java:4092)
at androidx.core.app.ComponentActivity.superDispatchKeyEvent(ComponentActivity.java:115)
at androidx.core.view.KeyEventDispatcher.dispatchKeyEvent(KeyEventDispatcher.java:84)
at androidx.core.app.ComponentActivity.dispatchKeyEvent(ComponentActivity.java:133)
at androidx.appcompat.app.AppCompatActivity.dispatchKeyEvent(AppCompatActivity.java:558)
at androidx.appcompat.view.WindowCallbackWrapper.dispatchKeyEvent(WindowCallbackWrapper.java:59)
at androidx.appcompat.app.AppCompatDelegateImpl$AppCompatWindowCallback.dispatchKeyEvent(AppCompatDelegateImpl.java:2814)
at androidx.appcompat.view.WindowCallbackWrapper.dispatchKeyEvent(WindowCallbackWrapper.java:59)
at com.android.internal.policy.DecorView.dispatchKeyEvent(DecorView.java:454)
at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:5742)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:5610)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5058)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5111)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5077)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:5234)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5085)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:5291)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5058)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5111)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5077)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5085)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5058)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5111)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5077)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:5267)
at android.view.ViewRootImpl$ImeInputStage.onFinishedInputEvent(ViewRootImpl.java:5437)
at android.view.inputmethod.InputMethodManager$PendingEvent.run(InputMethodManager.java:3072)
at android.view.inputmethod.InputMethodManager.invokeFinishedInputEventCallback(InputMethodManager.java:2615)
at android.view.inputmethod.InputMethodManager.finishedInputEvent(InputMethodManager.java:2606)
at android.view.inputmethod.InputMethodManager$ImeInputEventSender.onInputEventFinished(InputMethodManager.java:3049)
at android.view.InputEventSender.dispatchInputEventFinished(InputEventSender.java:143)
at android.os.MessageQueue.nativePollOnce(MessageQueue.java)
at android.os.MessageQueue.next(MessageQueue.java:363)
at android.os.Looper.loop(Looper.java:173)
at android.app.ActivityThread.main(ActivityThread.java:8147)
at java.lang.reflect.Method.invoke(Method.java)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1101)
但是，当我尝试复制它时，一切似乎都可以正常运行，并且该应用程序没有崩溃。任何帮助，将不胜感激。
谢谢。
最佳答案
欢迎使用Process Death导致的生产崩溃，您的应用程序将被系统终止以回收资源，然后返回到应用程序，瞧瞧，未保存在setArguments，intent.putExtra或onSaveInstanceState中的内容(也未保存到磁盘上)要么)，完全丢失了:)
如Singleton object becomes null after app is resumed中所述:
因此，考虑到这一点，问题在于您设置了一个实例字段，而不是通过viewModelType传递了setArguments。
companion object {
fun newInstance(viewModelType: ColumnDetailViewModelType) = ColumnDetailFragment().apply {
this.arguments = Bundle().also { bundle ->
putSerializable("viewModelType", viewModelType)
}
}
}
在另一边:
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
viewModelType = requireArguments().getSerializable("viewModelType")
}