I asked this question before getChildFragmentManager() and viewpager without any responses, probably because the explanation was too long.
Simply put I have a viewpager inside a fragment. The pages inside that viewpager need to be replaced through a series of screens. Pressing back on those screens will not exit the application. How do I do this?
challenges:
viewpager xml does not use framelayout. when I use the replace method, what container
id do I use?
when replacing the fragments why would I use getChildFragmentManager each time if that is private to the current fragment?
#goonedroid: that's not the case I'm looking for here. The only similarity is that the fragment has a viewpager. My viewpager's pages need to be replaced when clicked:
I have a navdrawer. Clicking item 2 shows FragmentA. Clicking FragmentA replaces it with FragmentB. Clicking FragmentB replaces it with FragmentC. Clicking FragmentC takes you back to FragmentB. Fragments are added to the backstack for proper back navigation.
Clicking item 1 in the navdrawer shows FragmentZ with a viewpager. The viewpagers pages are just FragmentA and all the aforementioned behavior. But going from A to B here, then pressing back shows no pages in the viewpager.
I finally figured out a solution, not sure why this works because I thought an Activity's getSupportFragmentManager() returns the same fragment manager as its fragment's getFragmentManager().
Anyway, instead of getFragmentManager() in the fragments, use getActivity().getFragmentManager()
Related
Scenario: I have three fragments in ViewPager in activity.
Fragment One
FragmentTwo
FragmentThree
I noticed that switching from fragment one to three onPause() method is called
but when I switched from fragment one to two onPause is not called
Problem: I want to show some data in FragmentOne's TextView with a webservice on button click.I clicked that button and data is shown But I noticed when I switch from one to two and then come back to fragment one data is shown. I want to hide that data when I come back to one. Is there any callback . ?
You need to understand Viewpager first. viewpager creates fragment in advance before and keeps so that there is smooth flow when you switch, like if you are on Fragment 2. viewpager creates 1 and 3 and keeps.
and when you are on Fragment 3 it retains Fragment 1.
Anyways you can increase the limit of viewpager with this
viewPager.setOffscreenPageLimit(int num)
you can understand all the lifecylce of fragment in Viewpager by putting Logs in onPause and onResume in viewpager fragments.
Anyways coming back to your prob. you need to have custom interface like this . answer helped me too
Its happening because Fragment One is in backstack. Dont keep FragmentOne in backstack while switching to FragmentTwo and on Back press of FrgamentTwo call switchContent for FragmentOne again .
I have a single activity that uses a bunch of different Fragments. I have a TabContainer Fragment that holds a TabLayout which uses a ViewPager to handle tab navigation. Each Tab is its own Fragment.
In one of my tabs, I want to tap and place a fragment on top of my Tabbed fragment. This is meant to be a "details" sort of screen, so I don't want the tabs to be visible. I'm using this and it works as intended:
fragmentTransaction.replace(android.R.id.content, fragmentToDisplay).addToBackStack(null).commit();
Now, when I navigate back, the content in my tab is empty. The content in the tab directly next to that tab is also empty. When I navigate two tabs away, the content is recreated and the normal functionality returns. Why is content not being recreated on the tabs initially when I remove my "detail" fragment?
It turns out that I was simply not passing the correct FragmentManager to the FragmentStatePagerAdapter.
I needed to call getChildFragmentManager() on the Fragment, not getSupportFragmentManager() on the activity.
Thanks to these two posts for the answer:
Fragment in ViewPager not restored after popBackStack
and: Replacing ViewPager with Fragment - Then Navigating Back
I've created an app, that has a main activity with a drawer menu so the user can click on some option and a fragment is open inside the activity.
What I'd like to do is to have several screens in one of the options and to navigate between them by tabs/slide the screen.
I saw an example of doing it inside one activity and with a fragment per 'sub-screen', my question is: how can I do it when I'm already 'inside' a fragment?
Thanks
Fragments can support having other Fragments inside them. The key to making this work is to remember to use getChildFragmentManager() to get the Fragment's FragmentManager instead of getFragmentManager() which gets the Activity's FragmentManager.
If you want to swipe between views, use a ViewPager inside your Fragment UI. The ViewPager will use a FragmentPagerAdapter to handle the Fragments for display.
So in my android application, I am currently using viewpager as well as fragments. What I am trying to do is start off the application using a viewpager, which is a fragment itself, that contains three fragments. The third fragment in the viewpager has a button, when clicked on will replace the viewpager fragment with another fragment. I press the button, and the viewpager fragment is replaced with the other fragment ok. But when I press the back button, it returns to the viewpager fragment, but all I see it a blank screen. What should happen is that I should see the third fragment in the viewpager. I think what is happening is that when I press the back button, it goes back to the viewpager, but does not load the fragments in the viewpager. Does anyone know why this is happening?
My problem
I am using a ViewPager to display fragments inside a FragmentActivity. ViewPager gets fragments from the attached FragmentPagerAdapter.
mViewPager = (ViewPager) findViewById(R.id.view_pager);
mAdapter = new HomePagerAdapter(getSupportFragmentManager());
mViewPager.setAdapter(mAdapter);
Suppose ViewPager has 3 fragments to display: Fragment1, Fragment2, Fragment3. Fragment1 is a grid fragment and displays a grid. Fragment2 and Fragment3 have their own content to display.
When the use swipes on the screen, ViewPager will display the next fragment - Fragment2. And so on.
What I want?
What I want is that, when an item from the grid (displayed by Fragment1) is clicked, Fragment1 should be completely replaced with some other fragment, say Fragment4 (this is different fragment and is not returned by the attached adapter). User will work on Fragment4 and after ButtonBack click (just button iside Fragment4), Fragment1 with the grid should be displayed again. Meanwhile ViewPager should behave the same i.e on swipe, the next fragment (in our case Fragment2) will be displayed.
So I just want to get the same behavior as in example:
http://developer.android.com/training/basics/fragments/fragment-ui.html#Replace
My question
So, is this possible to achieve? If yes, then how to?
I would greatly appreciate for your help. Alex.
P.S. Sorry for my English:)
I've made a little example that shows how to achieve it:
https://github.com/danilao/fragments-viewpager-example
I think the point is to use another fragment as a container.
One way to achieve this is by adding another FragmentActivity that displays your Fragment4. Use Intent to start this activity and sent grid item position or other data in Extra.
On press of backbutton this activity will be finished and last activity with view pager will be displayed.
[EDIT] Old response. Better solutions are provided in other answers,
You will have to do the fragment transaction and add the existing fragment into backstack.
I created a sample project to show you how to do it.
The code is not fine tuned, I just created it to show you how to do it.
https://drive.google.com/folderview?id=0BxHClVwHSqq5dVRvT1Qyd0hYN0k&usp=sharing
But please be aware that even if you press back at any of the view pager screen, the previous fragment ends up showing as it is the same activity.
IF this is not expected behavior, then you should consider having multiple activities instead ( like tab layout )