我需要一些帮助来解决以下崩溃问题。我正在刷新我的重新启动列表Activity
通过致电fragment
in 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 && myListViewModel.mList.hasActiveObservers()) {
myListViewModel.mList.removeObservers(this);
}
myListViewModel.getFilteredList(query).observe(this, mainObserver);
}
如果您使用的是 viewpager,请确保相应的片段实际上已附加到其活动(这是错误试图告诉您的内容)。可能会发生片段不可见的情况,因此它没有附加(取决于视图分页器的配置方式)。
一个快速而肮脏的修复:
public void search(String query) {
if(!isAdded()) return; //<---- returns if the fragment is not attached
query = "%" + query + "%";
if (myListViewModel == null) {
myListViewModel = ViewModelProviders.of(this, viewModelFactory).get(MyListViewModel.class);
}
if (myListViewModel.mList != null && myListViewModel.mList.hasActiveObservers()) {
myListViewModel.mList.removeObservers(this);
}
myListViewModel.getFilteredList(query).observe(this, mainObserver);
}
但是,您应该重新调查您的架构,因为这些检查通常意味着一些其他代码异味。当您使用新的 Android 架构模式时,应该不需要进行此检查,因为生命周期模式会为您处理所有这些:https://developer.android.com/topic/libraries/architecture/lifecycle https://developer.android.com/topic/libraries/architecture/lifecycle
因此,基本上,您不应该直接调用片段的任何函数,而是调用相应的业务逻辑,该逻辑通知片段更新其视图。
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