刷新我的片段不工作像我想象的要 [英] Refreshing my fragment not working like I thought it should
问题描述
我在ListFragment这个漂亮的方法，我打电话来填充我的另一个片段的细节：
I have this nice method in my ListFragment I call to fill out the details of my other fragment:
private void showClientDetails(int pos) {
myCursor.moveToPosition(pos);
int clientId = myCursor.getInt(0);
if(mIsTablet) {
// Set the list item as checked
getListView().setItemChecked(mCurrentSelectedItemIndex, true);
// Get the fragment instance
ClientDetails details = (ClientDetails) getFragmentManager().findFragmentById(R.id.client_details);
// Is the current visible recipe the same as the clicked? If so, there is no need to update
if (details == null || details.getClientIndex() != mCurrentSelectedItemIndex) {
// Make new fragment instance to show the recipe
details = ClientDetails.newInstance(mCurrentSelectedItemIndex, clientId, mIsTablet);
// Replace the old fragment with the new one
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.client_details, details);
// Use a fade animation. This makes it clear that this is not a new "layer"
// above the current, but a replacement
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.commit();
}
}
}
当用户点击一个客户端上的ListFragment认为这就是所谓的：
It is called when the user clicks on a client in the ListFragment view:
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
mCurrentSelectedItemIndex = position;
showClientDetails(position);
}
这个伟大的工程，但后来又FragmentActivity可以更改数据，这显示，所以我认为这会工作：
This works great, but then another FragmentActivity can change the data that this displays so I thought this would work:
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
//update the client list incase a new one is added or the name changes
if(requestCode==1899)
{
myCursor.requery();
theClients.notifyDataSetChanged();
showClientDetails(mCurrentSelectedItemIndex); //now if client was edited update their details in the details fragment
}
}
现在我知道了行：
如果（详细信息== NULL || details.getClientIndex（）！= mCurrentSelectedItemIndex）{
prevents的code块被达到时，它在我的onActivityResult调用。所以，如果我删除如果语句，那么事情吓坏了与ft.commit（）有嘘声配合和给我的错误：
Prevents the block of code being reached when its called in my onActivityResult. So if I remove that if statement, then things freak out and the ft.commit() has a hissy fit and gives me the error:
`07-08 16：53：31.783：ERROR / AndroidRuntime（2048）：java.lang.IllegalStateException：产生的原因的onSaveInstanceState后无法执行此操作
`07-08 16:53:31.783: ERROR/AndroidRuntime(2048): Caused by: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
所以我猜什么，我试图做的是不是添油加醋因为它的声音，这是没有意义的我，因为我能做到这一点onListItemClicked整天的片段显示新点击客户端的细节不断很好...
So I guess what I am trying to do isn't as cut and dry as it sounds, it makes no sense to me since I can do that onListItemClicked all day and the fragment displays the details of the newly clicked client constantly very well...
我甚至在尝试这样做我的 onActivityResult ：
I even tried this in my onActivityResult:
//simulate a click event really fast to refresh the client details
showClientDetails(0);
showClientDetails(mCurrentSelectedItemIndex);
这是什么也不做，是不是我试着打电话给一些从onActivityResult这是不是一个UI线程还是什么呢？
that does nothing, is it im trying to call something from the onActivityResult which isn't a Ui thread or what not?
我做我的$ C $的ListFragment了C，以及有此
I do have this in my code of the ListFragment as well
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt("currentListIndex", mCurrentSelectedItemIndex);
}
这是什么错误是抱怨？
Is this what the error is complaining about?
推荐答案
其他 FragmentActivity 的行动正在执行这就要求片段任务通过在preparation一个新的实例调用的onSaveInstanceState 保存其状态正在重建。我已经看到了这个例如，当我发射了从一个片段充斥着整个屏幕的活动，因为这导致了查看从片段被分离，国家需要保存等。
The other FragmentActivity's action is performing a task which requires the Fragment to save its state via a call to onSaveInstanceState in preparation for a new instance being reconstructed. I've seen this for example when I was firing off an activity from a fragment which filled the entire screen as this resulted in the view being detached from the fragment, state needing to be saved etc.
您根本不能称之为提交的的onSaveInstanceState 和片段的新实例被创建。请参阅<一href="http://developer.android.com/reference/android/app/FragmentTransaction.html#commit%28%29">commit.
You basically cannot call commit between onSaveInstanceState and the new instance of the fragment being recreated. See commit.
至于解决方案，然后要么重新思考，试图避免提交被调用时，它或者您也可以致电 commitAllowingStateLoss ，如果你认为这是正常的用户界面对用户意外更改。
As for the solution, then either re-think to try and avoid the commit being called when it is or alternatively call commitAllowingStateLoss if you think it's OK for the UI to change unexpectedly on the user.
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