我需要一些帮助来解决以下崩溃问题。我耳目一新，我就重新启动列表Activity通过调用fragment在viewpager刷新其列表。以下是崩溃的堆栈跟踪：
Caused by java.lang.IllegalStateException: Can't create ViewModelProvider for detached fragment
at android.arch.lifecycle.ViewModelProviders.checkActivity(ViewModelProviders.java:51)
at android.arch.lifecycle.ViewModelProviders.of(ViewModelProviders.java:105)
at com.ui.fragments.mainpagerfragments.ConversationListFragment.searchConversation(ConversationListFragment.java:383)
at com.ui.activities.HomeActivity.onRestart(HomeActivity.java:288)
at android.app.Instrumentation.callActivityOnRestart(Instrumentation.java:1256)
at android.app.Activity.performRestart(Activity.java:6365)
at android.app.Activity.performResume(Activity.java:6376)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3299)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3345)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1532)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:207)
at android.app.ActivityThread.main(ActivityThread.java:5728)
at java.lang.reflect.Method.invoke(Method.java)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679)
从活动 onRestart 调用：
((MyListFragment) adapter.getFragmentAtPosition(0)).search("");
片段中的方法：
public void search(String query) {
query = "%" + query + "%";
if (myListViewModel == null) {
myListViewModel = ViewModelProviders.of(this, viewModelFactory).get(MyListViewModel.class);
}
if (myListViewModel.mList != null …