I'm having problem with view pager which is inside of some fragment. To work with view pager I'm using FragmentPagerAdapter. And sure I'm getting java.lang.IllegalStateException: Recursive entry to executePendingTransactions exception when trying to run my app.
Most people say it's impossible to have FragmentPagerAdapter inside other fragment, so I'm sorry if this question is invalid. I was just hoping that maybe someone has some fresh ideas about this problem and its possible solution.
P.S. I've got an advice to set adapter inside of AsyncTask (I can clarify this case if someone needs it), but this solution has some bugs related with restoring such fragment state, so it's working for me.
Starting with Android 4.2, you can use nested fragments. The Android support library now also includes support for this, so you can use it with older Android versions.
The basic pattern looks like this:
Fragment videoFragment = new VideoPlayerFragment();
FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
transaction.add(R.id.video_fragment, videoFragment).commit();
Related
EDIT: I want to solve problem of duplicating fragment in view Pager, removing them isn't the best solution.
I have a problem with FragmentManager in my app. Every time when I click "Wykłady teoretyczne" or "Wykłady popularnonaukowe" on Navigation Drawer my app is creating new fragment ScheduleFragment() which contains ViewPager and in SchedulePagerAdapter app is creating new 3 fragments (ScheduleEventFragment()) to swipe them in ScheduleFragment. My problem is that FragmentManager doesn't remove old ScheduleEventFragments, for all the time it keeps them in memory. How can I fix this problem?
I have my project on GitHub, please check it.
There you have screen from debuging
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.remove(R.id.container,fragment,optionalTag);
fragmentTransaction.commit();You can also detach or replace
Always check if fragmemt.isAdded() and then only add the fragment if not.
So I am trying to integrate Google Maps into my application, I came across a concept that I don't entirely understand. I have seen that adding google maps into an app and it seems the most common way to do so is with an activity.
I found some websites and a SO question showing how to put Google Maps in a fragment, but would that be an issue if the user is constantly clicking on profiles and going back? Causing the map to be recreated or resumed constantly. Would that performance be better if the map was an activity instead?
Basically, Im not sure the best way to transition from an activity GUI to a fragment? I've had an app that only used 1 activity, I just used multiple different fragments changing them with this code
FragmentManager fm = getFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
Fragment fragment = getFragmentManager().findFragmentById(R.id.framecontainer);
if (fragment == null) {
ft.add(R.id.framecontainer, frag, tag);
} else {
ft.replace(R.id.framecontainer, frag, tag);
}
ft.addToBackStack(null);
ft.commit();
I am confused because when I created my main activity, I called
setContentView(R.layout.baselayout);
This layout contained only a frame container, I would then add in a HomeScreenFragment right away and when I needed to change, I would use the FragmentTransaction code above.
However, if my new MapActivity used setContentView(R.layout.maplayout); how would I best change screens? If R.id.maplayout does not contain a framelayout, is it best to start a new activity that uses many fragments like the one I mentioned before? I remember hearing that calling setContentView more than once or outside onCreate() is bad practice.
It seems I am missing something because so far it seems like there is 2 ways of using activities with different layouts
Starting a new activity every time and just trying to minimize the amount of activities.
Make an activity with a FrameLayout and just swap fragments everytime
To address my actual problem
I want my users to click another user marked on the map which will bring them to a profilelayout and view that user's profile, should I use one of the 2 methods above or how should I go about doing so?
Do you guys have any input to point me in the best direction? Thanks!
If your current application is already fragment heavy, have you considered using MapFragment? I think if you're cleaning up your objects/resources appropriately it shouldn't really be a performance issue.
Also according to the documentation it says the following about the MapFragment:
It's a wrapper around a view of a map to automatically handle the necessary life cycle needs.
I think it's also good to note that it's possible for you to do layout manipulation by adding/removing views using the LayoutInflater.
I working on a app whitch has 1 activity with 2 buttons (Map and Listview). By clicking on the buttons the fragment into the FrameLayout needs to change from a listview to a mapview (or from map to listview).
I got this working and the fragments are show the data exacly as i want BUT...
I have a few problems by switching between the fragments. I struggled with the code and the best i got working is this:
FragmentManager fragmentManager;
Fragment listOverview;
AlertOverviewMapsFragment mapsOverview;
#Bind(R.id.fr_overviewContainer) FrameLayout fr_overviewContainer;
#OnClick(R.id.btn_list_overview) void openListOverview()
{
// Add the fragment to the 'fragment_container' FrameLayout
if (listOverview == null) { listOverview = new AlertOverviewListFragment();}
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fr_overviewContainer.removeAllViews();
fragmentTransaction.add(R.id.fr_overviewContainer, listOverview).commit();
}
#OnClick(R.id.btn_maps_overview) void openMapsOverview()
{
// Add the fragment to the 'fragment_container' FrameLayout
if (mapsOverview == null){ mapsOverview = new AlertOverviewMapsFragment();}
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fr_overviewContainer.removeAllViews();
fragmentTransaction.add(R.id.fr_overviewContainer, mapsOverview).commit();
}
The problem is when i click a second time on a button the app crashes and i get a java.lang.IllegalStateException: Fragment already added error. I understand that it means that i added the fragment to the manager (or transaction, dunno). I can create or find some workarounds for this but since this is nothing new i'am looking for the usual way to switch (replace) between the 2 fragments.
The fragments contains data which are loaded from the internet, it will be nice when the data is saved and loaded again by reloading the fragment. (so the user sees the old data when it is updated again in the background)
A CLEAR code example would be nice.....
i read something about the fragment manager and transactions and so as i understand the manager makes it posible to add, remove, delete......... fragments from a transaction? so i need 1 transaction per activity? or is this twisted? so the manager contains the fragments? this part is not clear and realy complicated for me. I'am happy when someone can help me with a solution for my problem and it would be nice when someone can explain how the transactions and the managers work in a realy SIMPLE way becouse i'am just started with programming Android apps.
Thanks for reading my problem and lot more thanks for the people who takes the time and patience for writing an answer!
Dear ladies and gents,
First of all, please do not mark my question down. If you think that my question is too stupid please let me know and i will edit it or remove.
So my actual question is that I have an activity (extends Activity). In that activity's layout I created FrameLayout where I then attach different four fragments(so each of them extends Fragment. So in one of that fragments I would like to implements swipeable tabs(see screenshot).
I know that it is usually done by implementing viewPager and FragmentPagerAdapter, but I can not do this as if I'm calling getSupportFragmentManager in my fragment it gives my an error. If i am using getActivity().getFragmentManager() it gives me error that android.support.v4.app.fragmentmanager cannot be applied to android.app.fragmentmanager. I have to use android.support.v4.app.fragment in my fragment, because otherwise I will not be able to implement my activity's view(described at the beggining).
Any ideas or suggestions would be very appreciated.screenshot
Make sure you are using Fragment class that you extends your fragments comes from support library. You also need to use FragmentActivity to call method getSupportFragmentManager();
On the other hand, viewpager which is in your fragment need to implemented as usual that you can find on internet except getChildSupportFragmentManager();
This one called "nested fragments".
PS: I am not sure but you can also use AppCompatActivity instead of FragmentActivity. FragmentActivity and ActionBarActivity must be deprecated.
Good luck
You can use getChildFragmentManager() when using Fragments inside other Fragments.
New version of Support Library v4 (Android 4.2) resolve this problem. For do this, simply do constructor of your custom FragmentPagerAdapter like this:
public CustomFragmentPagerAdapter(android.support.v4.app.Fragment fragment)
{
super(fragment.getChildFragmentManager());
// write your code here
}
This work because new Android version approve using nested Fragments
I'm really sorry, but atm I can't test any code. But I have a question. How should we work with fragment manager? I got an error when I was trying to add fragmentA, then fragmentB, and then again A. I got an error : fragment is already added. And here is the question: should I call transaction.Add at launch and then replace it with others fragments or I shouldn't.
Thanks for attention and sorry for my English, it is not my native language
You can add it if you want but you on first launch you can actually just use .replace even if there isn't a fragment currently loading into the frame and it will still work.