I'm using FragmentTabsPager, and when my app starts, both tabs initiate net-requests to fetch their content....I would expect the first tab to load onAppStart, and the second tab to load when it is clicked, this is not the case as they are both loading simultaneously onAppStart why is this the case?
Each tab within a FragmentTabsPager runs a Fragment, which is essentially an activity within a single view. It has its own lifecycle and behaves similarly to an actual Activity.
Initialize your Fragment from the onTabClick (or equivalent event) in the parent
Related
I have a fragment initially inside my activity, this fragment contains a button that's when it's clicked it open the second fragment, and the second fragment contains a button that's when it's clicked it open the third fragment, and so on ...
Now I want to test the launch of the third fragment after passing by the 2 old fragment (not testing the fragment in isolation), I tried to preform a click in the button inside each fragment but it seems espresso doesn't wait for the 2 fragment to launch, before clicking the button inside it, is there any solution for this ?
Without seeing the code its hard to tell what the best way to handle this would be.
However this seems like an issue with the IdlingResource. Espresso should wait until 2nd fragment has finished launching before moving forward.
You can handle it by adding a SystemClock.sleep(int milliseconds) . That is not an ideal solution however and sleeps should be avoided at all costs.
No it's not a timing issue I have an Activity with 3 fragments all of which are visible concurrently. Android Espresso will only do tests in the top fragment and refuses to acknowledge the presence of all the rest of the fragments.
i have an Activity which haves several Fragments and am using PagerAdapter for organising this Fragments , i got to know when my activity, loads all of my Fragment's codes also gets executed even when am at first Fragment at that time my whole codes of all fragment 2 or 3 also got executed which are in the onCreateView of my Fragment so can we stop this behaviour i want to execute this codes only when user selects that particular fragment
you can limit your pager by calling this method default load number is 3
yourPager.setOffscreenPageLimit([number of pages]);
if you want just one page without preload try this link by TejjD
in my app i use SlidingTabLayout to make tabs ,my app has three tabs for each tab attach with fragment hence i have three classes extend from Fragment when Run App
show me onCreateView and OnCreate of first and second fragment created together i want to when click on second tab onCreateView and OnCreate of second tab created
because i load things from webservice when click second tab
like facebook app that happen loading things when click on tab
Looks like you're using SlidingTabLayout combined with ViewPager. ViewPager by default manages 3 items (curent one on one on the "left"/"right" side) one of which is displayed and 2 others are in idle state. You can't decrease number of such items so the only way for you is to move your web service call from onCreate/onViewCreated to some other place. For example you may call setHasOptionsMenu(true) in your second fragment and implement your web service call in onOptionsMenuCreated callback of your second fragment.
There is a predefined method called setOffscreenPageLimit in view pager,
setOffscreenPageLimit(int limit)
Set the number of pages that should be retained to either side of the current page in the view hierarchy in an idle state.
For eg.
ViewPager.setOffscreenPageLimit(3);
I'm trying to send data to 3 other fragments in a Tab of 4 from the first Tab which gets the data from the server, but observing the creation of the Tabbed Fragments, First and Second is Initialized, so the second doesn't get the data and the third and fourth get it. Even, when I tried to load the data from onResume in the second Fragment Is there anyway I can let tell the Second Fragment should reload itself when the Tab is clicked. Any help would be appreciated
Maybe using OnPageChangeListener would when you detect when the SecondFragment becomes active.
I would generally recommend notifying such things through the parent Activity
I have this Android architecture:
Activity that has an action bar with two tabs.
each tab is a fragment
my problem is, when i start the activity, the two tabs start working.
I don't want the second tab to start working unless i click on it.
How please?
note that i am using onCreateView on my second fragment
note
i tried to make my functions on onResume() but still fires itself
This comes from caching of the ViewPager : it will initiate the visible fragment and one on each side (left and right). There is no thing you can do against that. The method setOffscreenPageLimit will refuse a value below 1.
So the solution is to fire your own even to actually "start" your fragment when it becomes visible. Don't use the fragment lifecycle per say, but add a custom method : startBeingVisible().
To fire this custom event, you can just use an OnPageChangeListener.