once again, I am following this tutorial: androidhive - tab layout with swipe able views . All 3 fragment tabs are loaded with different information and logic and layouts. I would like to refresh each fragment when their tabs have been clicked as it auto loads the fragments from start as it uses the view pager. Is there any simplest way out that I could load only a/1 fragment using view pager? Or to reload the fragments? Thanks for your help!
Try to add this to your viewpager:
MY_VIEWPAGER.setOffscreenPageLimit(0);
Check out the documentation.
Pages beyond this limit will be recreated from the adapter when needed.
The limit of 0 will cause a recreation of the fragment when you open a tab.
Related
I am A beginner at android. I have created an app which loads news from JSON to recycler view. I want to open an activity when the user swipes from left to right. I tried different methods but it doesn't work for me. Please help.
You have to create an activity first and put a view pager in it and switch between fragments : ( its better to use fragments at this kind of situations, u can swipe between ur fragments by using android view pager )
Here is a great link that gonna help you :
https://medium.com/#kyroschow/how-to-use-viewpager-for-navigating-between-fragments-with-tablayout-a28b4cf92c42
Have a good day
The better option is to use one Activity & other Fragments. And then use Viewpager for swipe between fragments. Follow below link:
https://developer.android.com/training/animation/screen-slide
Lets keep it really simple. Say I created 4 layout's called page_one, page_two, page_three, page_four. How can you make it so you can swipe through all those pages back and forth horizontally?
You can use a View Pager to achieve this.
you can swipe through the pages by using a view pager.
you can go through this link
http://developer.android.com/training/animation/screen-slide.html
Edit:
1) Create 4 layouts for 4 fragments view.
2) Create a activity which extends FragmentActivity.
3) Create an adapter for view pager and set the adapter in your main method.
4) You can use tabs also for this.
Am running in some weird problem. I have implemented ViewPagerTabStrip by following the tutorial Here
It's working fine and i have implemented Three Tabs.
On the first Page /tab , i am loading the data from server & displaying it in the ListView
The problem is, when i swipe to the Third Page & then i swipe back to Second page, the data of the first page is being loaded from the server again.( View of first tab is re-created.)
From the logs, it seems that this is the behavior of ViewPager & Adapter.
When we are on the first tab, it creates the view of second tab/ page as well in background & when we are on the Second tab, it was doing same for Third tab in background & upon reaching to third tab, it didn't created the view for it self(i.e third tab).
But when we swipe back to second tab, it re created the view of first tab as well.
How to solve this ? we can't afford to load the data from server again and again while swiping through the tabs.
I mean is there any way to stop the reload of data (or re-creation of view) while just swiping through tab pages? It should load the data when the whole fragment activity of View Pager is created and not at the time of swiping.
Any help on this please ?
Yeah, the ViewPager only keeps a certain number of fragments in memory before destroying them- this default number is usually two. Thus, what you have to do is tell the ViewPager to retain those fragments.
The simplest solution is to simply tell the ViewPager to keep three fragments in memory as follows:
viewPager.setOffscreenPageLimit(3);
Here are a few suggested answers on how to retain fragments (with more than just this method) and the reasoning behind the default behaviour as well as these solutions:
ViewPager and fragments — what's the right way to store fragment's state?
retain state of viewpager fragments android
I have a custom ViewPager in which I have 4 fragments, each fragment has different listviews, and its on the start screen of the application. The listview's are taking time to load as soon as the application starts. I'm not pulling any data into the listview, its just the implementation. Implemented OnPageChangeListener to change the listview as I swipe through the fragments
Why does this happen?
changed the implementation, instead of fragments I used PagerAdapter.
In my application I am using ViewPager from the support library- v4
In main screen I have viewPager which got max 5 Fragment, all fragment belongs to one class ArticlePager
Now in main screen there are list on categories, now the content of the pager is based on that selection,
The problem I am having is, I have used FragmentPagerAdapterwhich stores the Fragment and if the fragment is already exist, It will return the old Fragment without recreating it. That things runs perfectly, but Problem Occurs # the time of orientation change.
For instance
If there are 5 View normally in every fragment For the given position, but There are also some which contains 2-3 views. Now if I change the orientation on page No. lets say 5 which contains only 3 view inside.
So, by now in every category on Page 5 I'll got the view containing 3 view, which is not something I want.
In my application each category contains the pagination
Is there any way such that i can destroy and recreate the Fragment on click of category? or any other work around
Thank you
OK thanks to open source I find my solution, FragmentPagerAdapter I have override the method instantiateItem and got the solution.
This can be easily achieved by FragmentStatePagerAdapter such that it doesn't store the fragment. It recreate it all the time, but I don't want that in 100's of page because of only few pages.
So if I understand correctly, your problem is that after rotation, the wrong set of fragments are in you ViewPager?
Why don't you check the current selected tab in onResume() or onStart() of your Activity, and create/assign a new PagerAdapter for you ViewPager with the correct fragments?