I am developing an app in Android using Fragments. I have this three tabs:
I know that is not possible to prevent the load of one fragment on each side (previous and next) as far as the minimum value of setOffScreenPageLimit() is 1 but does it mean that if I want to show a ProgressDialog on the onPreExecute method of an AsyncTask running within Descargas Fragment this will cause that when I nav to the Capturador that ProgressDialog will be necessarily loaded? If yes I have no idea of how to let the user know that I am downloading the packages (that's what Descargas does, to parse some XML).
Thanks in advance ;)
Embed a ProgressBar on the Descargas fragment. Or overlay an indeterminate progressbar over the center of the fragment while it loads.
Dialogs are really part of the activity, it wouldn't make sense that it's only applicable to one of the pages.
At the end of the day though if you must insist on using dialogs, you can implement an onPageChangeListener
viewPager.setOnPageChangeListener(OnPageChangeListener);
And you can pull up the appropriate dialog when the designated fragment is selected and the opposite when you navigate away.
Related
I am making an app in which the header and footer would be same through out the app. i can start another activity with the same pattern of design in header and footer but as the other activity starts there comes a delay and we can easily notice that a new activity has pop up.
So what I want :
I want that if user click on any button from the footer the content in the middle between header and footer should be change and user should not see any jump which is made when I move to other activity.
So for this I know that I can use fragments. But for some reasons I can not use fragment activity. All I want to move fragment in the center only. So How can i do that . and How can I initialize other things which are in new fragment let say the upcoming fragment could have button so in this way , I wanted to know would it make my main activity heavy which is calling all these fragment
So please guide me through the demo code .
Note: please do not refer me to a fragment link just past some code to give me some idea.
Will be easiest to have the activity implement the header and footer and the variable content as fragments.
Please refer to this post. It has everything you need
Fixed header and footer in android app
I'm making an app with 4 tabs, the third one is ListView with data parsed from xml by AsyncTask.
I've got a problem with throbber (circle progress bar) which shows on a previous tab and I can't find solution of it.
Does anybody knows how to prevent this kind of pre-loading when AsyncTask starts on previous tab, not on ListView (third) tab?
There is no way to prevent pre-loading fragments in ViewPager.
But you can use some external libraries to take that result.
For example, ViewPagerExtensions or ViewPagerIndicator.
I am using ViewPager. I have 3 fragments (A,B,C) and two of them(A & C) are populating ListView from the server, so it will take a few seconds for that. And I am showing a ProgressDialog. B is the fragment which is set to show first and its is not having any background process, having a few buttons only.
So the problem is that the ProgressDialog will always show upon creating that activity,that is all the Fragments are loaded always.
So I wonder if I can load the specific Fragment only (A or C) when I open it (Slide) so that the user who want to use the Icon menu (B fragment) should not need to wait for the other fragments (A & C) to load. I am not sure whether its possible or not. Can anyone suggest me any code snippets or references to achieve it. Any help regarding this will be really appreciated.
Nevermind, I had done it easily with AsyncTask and the Fragments are updated in background
I'm using FragmentPagerAdapter with a tabbed interface. My interface happens to have three tabs. I can see that as soon as my app is created, the adapter requests that both tabs one and two both be created immediately (I assume this is so swiping to the next tab appears smooth to the user).
Is there a way to stop the automatic loading of the next tab? My tabs are pretty heavy, and loading two right at startup is taking a good deal of time,
Thanks
Is there a way to stop the automatic loading of the next tab?
Sorry, no. This is driven by setOffscreenPageLimit(), and the minimum value is 1, meaning that ViewPager will always try to create and hold onto at least 1 page on each side.
It sounds like you need to move more logic into background threads.
I want a Viewpager that shows loading while content is coming in from the background. Basically I expect the first View to be loaded, but View+1 and View-1 will still be loading. If the user swipes to either side I want them to be presented with a spinning dialog while it loads
Would I just add AsyncTasks into the ViewPager with some conditions determining when they will run? I dont want too many AsyncTasks to be loading as the viewpager will have many views off to the sides.
I think the Trulia app does this, it is similar to what I am looking for. Apartment image viewing shows a loading screen while the images are loading in that viewpage.
Also for the record, can I just treat viewpagers like onCreate functions of an activity? That would really clear things up
Insight appreciated
Have a look at the supplied FragmentPagerAdapter if you want to perform more Activity-like lifecycle management of each page.