片段尚未附加? [英] Fragment has not been attached yet?

问题描述

下面是我的代码.我要达到的目的是在Recycler视图中显示Viewholder.内部视图传呼机中，我正在显示一个片段，向左滑动时，我正在显示另一个片段.但是，当我运行该应用程序时.应用程式当机.不知道我要去哪里.我认为这是片段概念中的某些地方.请帮助我

Below is my code. What i am trying to achieve is that i am displaying viewholder inside my Recycler view. Inside view pager i am displaying one fragment and on swipe left i am displaying another fragment. But when i run the app. App is crashing.Don't know where i am going wrong. I think it's some where in fragment's concept. Please do help me

 @Override
 public void onBindViewHolder(ManageCustomerViewHolder holder, int position) 
 {
     holder.viewPager.setAdapter(new MyPageAdapter(fragmentManager, fragments));
 }

 private List<Fragment> getFragments() 
 {
     List<Fragment> fList = new ArrayList<Fragment>();
     fList.add(MyFragment.newInstance("Fragment 1"));
     fList.add(Myfragment1.newInstance("Fragment 2"));

     return fList;
 }

 public class ManageCustomerViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener
 {
    ViewPager viewPager;
    viewPager = (ViewPager) itemView.findViewById(R.id.viewpager);

    itemView.setOnClickListener(this);
 }

这就是错误所在:

java.lang.IllegalStateException:片段尚未附加.

java.lang.IllegalStateException: Fragment has not been attached yet.

推荐答案

我在我的应用中遇到了同样的问题.

I was facing the same issue in my app.

堆栈跟踪:

java.lang.IllegalStateException: Fragment has not been attached yet. android.support.v4.app.Fragment.instantiateChildFragmentManager(Fragment.java:2154)
android.support.v4.app.Fragment.getChildFragmentManager(Fragment.java:704)

该应用在此行崩溃:

function performSomeActionInChildFragments() {
    List<Fragment> fragments = getChildFragmentManager().getFragments();
    ...
}

当片段不再连接到其父活动/片段时，就会发生这种情况.因此，简单的isAdded()检查应该可以为您解决此问题.

This happens when the fragment is no longer attached to its parent activity/fragment. So a simple isAdded() check should resolve this issue for you.

修复:

function performSomeActionInChildFragments() {
    if (!isAdded()) return;
    List<Fragment> fragments = getChildFragmentManager().getFragments();
    ...
}

来自文档:

iwego()-如果该片段当前已添加到其活动中，则返回true.

isAdded() - Return true if the fragment is currently added to its activity.

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