[android-developers] Re: Share Loader's data between multiple fragment
I would do #2, except don't use setArguments to pass the data in. When the loader callbacks fire, just reach into each fragment instance directly and call a custom method to pass the model in. You might have to check fragment class types and cast to implement this. Personally I would make all the fragments implement an interface such as ModelReceiver which a method receiveModel(Model) so they can get the model object. Doug On Tuesday, June 3, 2014 3:53:41 PM UTC-7, Nathan Barraille wrote: Hello, I have a problem with the Android framework for which I'm not able to find any ideal design solution. I have an activity that contains multiple fragments, all those fragments need to access the same model object. This model object can be loaded from a memory cache, ContentProvider or network, depending on a bunch of parameters. I wanted to use a Loader to load that model object, so that it doesn't have to be loaded again when the activity is recreated, and it can be observed if it changes. All my fragments don't really have a purpose without the model object loaded, as they don't have any data to display. Here are the options I considered: *#1: Have the activity initialize the loader in its onCreate() method, and add the fragments to the activity when the model finishes loading: * *Problem:* It is unsafe to make fragment transactions in a callback method, because the activity state might be paused, according to http://developer.android.com/reference/android/app/LoaderManager.LoaderCallbacks.html#onLoadFinished(android.content.LoaderD, D) *#2: Have the activity initialize the loader and add the fragments in its onCreate() method, and call a custom method on the fragment to set the model* *Problem:* I cannot use the recommended setArguments() method to set the data on the fragment, which means that if my fragment is re-created by the system, it won't have a reference to the model anymore *#3: Have the activity initialize the loader and add the fragments in its onCreate() method, and have the fragments access the model through the activity* *Problem*: The fragments won't know whether or not the model is loaded in the activity, and if I add a method on the fragment for the activity to let it know, I'll have the same problem as #2 *#4: Have all my fragments initialize a loader independently and load the data on their own.* *Problem:* That's really inefficient, especially if the model needs to be loaded from the network I'm kind of thinking now that I could do something like #3, and having an additional call in my fragments' onResume() that checks whether or not the model is set in the activity to set its state, but that seems hacky... Is there a cleaner way of doing this? Thanks! -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en --- You received this message because you are subscribed to the Google Groups Android Developers group. To unsubscribe from this group and stop receiving emails from it, send an email to android-developers+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[android-developers] Re: Share Loader's data between multiple fragment
Like Doug said. That's sort of how i'm doing it and had no problem.
So #2 kind of.
Here's my onLoadFinished :
@Override
public void onLoadFinished(LoaderArrayListTour loader, ArrayListTour
data) {
CatalogTabFeatured featuredFragment = (CatalogTabFeatured)
getSupportFragmentManager().findFragmentByTag(makeFragmentName(mViewPager.getId(),
0));
featuredFragment.setData(data);
CatalogTabRecents recentsFragment = (CatalogTabRecents)
getSupportFragmentManager().findFragmentByTag(makeFragmentName(mViewPager.getId(),
1));
recentsFragment.setData(data);
CatalogTabRated ratedFragment = (CatalogTabRated)
getSupportFragmentManager().findFragmentByTag(makeFragmentName(mViewPager.getId(),
2));
ratedFragment.setData(data);
}
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Re: [android-developers] Re: Share Loader's data between multiple fragment
Yeah, I guess I can do that, but if I do I need to write custom code for
retaining the arguments across instance change, which I would have liked
the framework to be able to do for me, as described here:
https://groups.google.com/forum/#!topic/android-developers/bCc5tjOHQ1o
On Wed, Jun 4, 2014 at 8:47 AM, MathieuB blanc...@gmail.com wrote:
Like Doug said. That's sort of how i'm doing it and had no problem.
So #2 kind of.
Here's my onLoadFinished :
@Override
public void onLoadFinished(LoaderArrayListTour loader, ArrayListTour
data) {
CatalogTabFeatured featuredFragment = (CatalogTabFeatured)
getSupportFragmentManager().findFragmentByTag(makeFragmentName(mViewPager.getId(),
0));
featuredFragment.setData(data);
CatalogTabRecents recentsFragment = (CatalogTabRecents)
getSupportFragmentManager().findFragmentByTag(makeFragmentName(mViewPager.getId(),
1));
recentsFragment.setData(data);
CatalogTabRated ratedFragment = (CatalogTabRated)
getSupportFragmentManager().findFragmentByTag(makeFragmentName(mViewPager.getId(),
2));
ratedFragment.setData(data);
}
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Re: [android-developers] Re: Share Loader's data between multiple fragment
Couldn't you abstract the different ways of loading data inside the loader?
...and pass some sort of unique data ID to each fragment to identity the
data, but not the actual way of obtaining it (network, content provider,
etc.).
Then you'd be able to package this ID into each fragment's arguments,
leveraging the framework's persistence mechanism for orientation changes,
activity re-creation, etc...?
-- K
2014-06-04 20:03 GMT+04:00 Nathan Barraille nathan.barrai...@gmail.com:
Yeah, I guess I can do that, but if I do I need to write custom code for
retaining the arguments across instance change, which I would have liked
the framework to be able to do for me, as described here:
https://groups.google.com/forum/#!topic/android-developers/bCc5tjOHQ1o
On Wed, Jun 4, 2014 at 8:47 AM, MathieuB blanc...@gmail.com wrote:
Like Doug said. That's sort of how i'm doing it and had no problem.
So #2 kind of.
Here's my onLoadFinished :
@Override
public void onLoadFinished(LoaderArrayListTour loader,
ArrayListTour data) {
CatalogTabFeatured featuredFragment = (CatalogTabFeatured)
getSupportFragmentManager().findFragmentByTag(makeFragmentName(mViewPager.getId(),
0));
featuredFragment.setData(data);
CatalogTabRecents recentsFragment = (CatalogTabRecents)
getSupportFragmentManager().findFragmentByTag(makeFragmentName(mViewPager.getId(),
1));
recentsFragment.setData(data);
CatalogTabRated ratedFragment = (CatalogTabRated)
getSupportFragmentManager().findFragmentByTag(makeFragmentName(mViewPager.getId(),
2));
ratedFragment.setData(data);
}
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