I am having a really tough time with one small issue in my AppCompat activity with tabs. I am using the Android Design Support Library, and have implemented a tabbed application with fragments.
Now, I have no problem creating tabs & fragments in the Activity's onCreate() method, but I cannot for the life of me find if it is possible to add tabs programmatically from within a fragment.
For reference, all of my tabs use the same fragment (OneFragment.java). I have tried using FragmentManager / FragmentTransaction, but although this creates a fragment (I think!), it does not make a tab.
I have also tried to add a tab to the FragmentPagerAdapter and set the Tab Layout's adapter again, but this also seems to do nothing in the UI. Any help would be much appreciated!
I have also tried to add a tab to the FragmentPagerAdapter and set the Tab Layout's adapter again, but this also seems to do nothing in the UI
If you managed to add a tab to the FragmentPagerAdapter but the UI didn't change then you probably forgot to call the notifyDataSetChanged() method on it.
Related
I have a fragment with a textView. I want the textView to change when I scroll across the viewPager.I want to reuse the same fragment rather than creating a new fragment for displaying each text.How do I do this? I hope pro developers can understand what I mean.
You cannot attach a same fragment into activity twice simultaneously. If you want the behavior you mentioned don't use ViewPager. Just use swipe gesture detection in a layout and maybe some animations.
i have this app that i want to have a specific way of navigation. And so i made a research but i got confused. And i am begginer in android development.
i want to ask what kind of layout or anything i can use to achieve that. I dont search for super specific answer, just what is the thing that is doing the job i want. So there it is:
the blue block("choose a brand" view) has to be on that position at all times and only changing the text if needed. I want when one image button is clicked the whole green block with the image grid change into another xml layout. I want to call multiple layouts in the green block when i interact with the buttons of those layouts. Atm the green block is an <include layout ="layout.xml"/>
I really apreciate any answer. Sorry if is basic but i really tried to find the thing i need but so far i see solutions that prevent me from using simple inflaters. Thanks in advance
You have to use fragments for this scenario.
You will have a LinearLayout where the first element will be your blue block.
The second element will be a FrameLayout that you will change into the Fragment you need (usually it will have the ID container).
Create a Fragment and set the layout your layout.xml file.
Create a second Fragment with the desired layout you would like to change the green block.
As you click on a imageButton you will have to change the current Fragment with the desired one. Here you will see how to send objects to fragments.
You can find here a way to switch between fragments. In the ft.replace method the first id is the FrameLayout you will use as a container(see above).
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.container, new NewFragmentToReplace(), "NewFragmentTag");
ft.commit();
Be careful when you import fragments. If you use the support package you will have to use getSupportFragmentManager();
Read more on the android developer about fragments
I think what you are looking for is Fragment class, which can be used as reusable code that can be linked to a UI/layout.
From android documentation:
To create a dynamic and multi-pane user interface on Android, you need to encapsulate UI components and activity behaviors into modules that you can swap into and out of your activities. You can create these modules with the Fragment class, which behaves somewhat like a nested activity that can define its own layout and manage its own lifecycle.
Read more here
Currently, my app is using a navigation drawer for my fragments. However, I have 2 fragments that are related, I would like to put these under one heading on the navigation drawer and then have 2 tabs to switch between the related fragments once I select that choice on the drawer.
Is this possible with only one activity or would I have to implement another activity specifically for the tab? I've considered only adding the tabs once the right fragment is committed but that leaves the question of how to remove it once I switch to a fragment that doesn't require the tabs.
I'd also like to avoid having to implement another activity as I am trying to keep the navigation available through my whole app. I'd rather not have to create an identical drawer and then have to keep things consistent between the 2 drawers.
Edit:
So far, I've managed to make a parent fragment that has a viewpager, fragmentpageradapter, and tablayout. Swiping between the 2 tabs does indeed shift between my 2 desired child fragments. However, I am unable to change a textview in one of my child fragments from my MainActivity. I'm guessing the reason why this is the case is because technically, my parent fragment is in view, not my child fragment. Any suggestions to get around this?
Hierarchy:
MainActivity
-Navigation Drawer
--Fragment1
--Fragment2
--Fragment3
--Fragment4
---FragmentPagerAdapter (under Fragment4, tabs)
----SubFrag1
----SubFrag2
Here's how you might use FragmentStatePagerAdapter to swipe across a Fragment:
http://developer.android.com/intl/es/training/implementing-navigation/lateral.html
I hope it help you.
My main xml file has a FrameLayout, with one fragment defined in the XML. At runtime, I am adding another fragment on top of this, and then a third fragment on top of this. When I add the runtime fragments, I don't give containerIds to attach them to. This is all fine until the orientation changes. After the orientation change, the third fragment has gone beneath the second fragment. But obviously I want the z-order to stay how it was before the orientation change, i.e. the last fragment added should be on top and visible.
I've tried using containerIds when adding the fragments, and adding them to the FrameLayout defined in XML, but when I put in containerIds, the runtime fragments simply don't show up at all.
So I'm wondering why the fragments added at runtime don't show when I use a containerId. Is it because they are being added to a container which already contains a fragment (the one defined in XML)? How can I get around this? I've tried adding additional containers to the XML to hold the runtime fragments, but this doesn't seem to work. The only way to get the fragments to show is to remove the containerId from the call to FragmentTransaction.add().
Also, is it possible to change the z-order of fragments manually? I've searched Google quite a lot to find this out and haven't found any answers. I've tried using ViewGroup.bringChildToFront() and using the view returned by the fragment's getView() but this hasn't worked. I've also found out that you can nest fragments on Android 4.2+ with getChildFragmentManager(), but I'm supporting older APIs, and this method doesn't seem to be in the support library.
Any help greatly appreciated!
The way I got around this was to manually recreate the third fragment after the orientation change, and remove the one created by the system.
I have a Fragment activity which hosts a fragment list. The fragment activity also has a couple of text views which summarise the data in the fragment list.
FragmentActivity = Layout that contains a fragment container, text views and a button.
ListFragment = goes inside of the FragmentActivity's fragment container and is a list of data
This works fine as an activity, but now I'm trying to put the whole lot into another fragment container to display it in an action bar tab on another activity. I can only get it to work with the ListFragment (obviously this is because the FragmentActivity can't go inside of a fragment container) but this means that the summary text views and the buttons are missing and I really need them there too.
I wondered if anyone had suggestions of the best way to implement this? Some thoughts of solutions I've had:
Change the Layout of the activity holding the tabs if this certain tab is clicked
Programmatically add the text views and button to the fragment container if this tab is clicked
Add another fragment to the fragment activity, below the list fragment
Either way I'm stumped so any help is really appreciated.
Create a Fragment that resembles the layout of you FragmentActivity and add it instead. you can't add the FragmentActivity as a Fragment simply because it's not a Fragment but an Activity that was added a Fragments support for older versions.
So instead of adding you button and TextViews directly to the FragmentActivity Layout. Create a Fragment with the same components and add it to the Activity layout.
That way could could reuse this set of components in another location in your application if you needed to, using the same Fragment.