Hi I am developing android application in which I am using fragments and push to back stack. So my scenario is like this I have fragment A, B, C, D and I push them in following sequence A-->B-->C-->D and what I want I want to remove D and C and bring B on top. Is there any way to remove all together and bring one particular fragment on top of the stack. like pop from back stack upto xyz fragment tag. Is there any way to do this. Need help thank you.
You want this: FragmentManager.popBackStack(int id, int flags)
You need to save the value returned by FragmentTransaction.commit() of the transaction that adds Fragment B. Then later call getFragmentManager().popBackStack(commitId, 0);
Related
I'm working with the fragments navigation and have a problem removing one from the back stack. Here're specifics:
I have 3 independent fragments (let's name them A1, A2, and A3) and each of them can navigate to fragment B using findNavController().navigate(), which after some actions navigates to fragment C using the same method.
What I need is when the back arrow is pressed I return to the A-fragment(which I started from) avoiding fragment B.
I've tried using app:popUpTo, and popBackStack but it hadn't worked. Also, I'm highly not recommended to use FragmentManager
You can use
findNavController().popUp(2)
I need some help in Fragment stack. I have a scenarios. In that scenarios, We have four fragments A , B , C and D. I have added all the fragments in back stack using add method of FragmentTransaction. I want to swipe D to B without removing D in stack. As I have used below method for that. But it is removing D in stack.
appCompatActivity.supportFragmentManager.popBackStack(fragmentName, FragmentManager.POP_BACK_STACK_INCLUSIVE)
why don't you use viewpager?
The easiest way to work with ViewPager
I have three activities A,B,C,D.
When I use activity B, then previous activity is A. I will write it as A->B.
So when I click back I go to A.
However I want to start activity D from B. But instead of tree A->B->D I need to alter it to A->C->D. How can do it in android?
There are many ways to do it.
You can have a lok at the below links.
First- Second- and this-
We have multiple screens in our app and to switch between them we use FragmentTransactions, primarily replace, and we add fragments to the backstack when we do so. While doing so we stay within the same MainActivity.
So if we transition from Fragment A to Fragment B via some button we now have a stack that looks like
B
A
If we go to another Fragment C it goes on top of the stack like so
C
B
A
However, sometimes we transition to a fragment D, such that we want to wipe out the backstack so that users can no longer navigate back through C, B, A. We now want our backstack after navigating to D to look like this.
D
But in order to do so we need to clear the backstack using:
FragmentManager supportFragmentManager = getActivity().getSupportFragmentManager();
while(supportFragmentManager.getBackStackEntryCount() > 0)
{
supportFragmentManager.popBackStackImmediate();
}
clearingBackStack = false;
But when we do so, the onResume of fragments C,B and A are called. This is not the functionality we intend and can have negative consequences such as making unnecessary server calls. We have also noticed on low end devices that we see a flash of the popped fragments as they come off the stack.
We wish to avoid this behavior, is there a way to pop the entire fragment backstack without the popped fragments being activated in anyway?
I want to remove a fragment from backstack and put another fragment in its place which hasn't been created yet. Below is a picture of what I want to achieve.
Is there any way to accomplish this?
EDIT:
As pointed out by #Elltz, it's not possible. So my question becomes
Is it possible to destroy the last fragment from back stack?
Can I handle the back button pressed manually to provide a different fragment than what is on the back stack?
NO! NO! NO !
want to remove a fragment from backstack and put another fragment
you can not manually re-arrange the BackstackEntry. you can only listen,observe and call it. look into PopBackstack(String name, int flags) hence the first no
and put another fragment in its place which hasn't been created yet
you mean a null Fragment ?.. you can not also assign references to null object, the second no
Is there any way to accomplish this?
A confirmation No.
EDIT
YES! YES! YES!
Is it possible to destroy the last fragment from back stack?
you can; using FragmentManager & FragmentTransaction
FragmentManager fm = FragmentActivity.getSupportFragmentManager();
fm.beginTransaction().remove(
fm.getBackStackEntryAt(fm.getBackStackEntryCount()-1););
the first yes
Can I handle the back button pressed manually to provide a different fragment than what is on the back stack?
Yes, you can, but you have to do it in your FragmentActivity or Activity so you will need some interface or your own logic around that, or
with your own logic implementing BackStackChangedListener, this is actually the interface i was talking about with logic, this listener gets notified anytime a Fragment goes or leaves the Backstack, hence the second yes
Third yes was for pampering.
Hope it helps Sir.
You cannot actually do this, but what you can do is, make these tansitions but hidden
go to fragment 3 from fragment 2
go to fragment 4 from 3.
By hidden I mean, that user does not see this happening (you can set the layout visibility as gone).
But this way, Fragment 2 will be in the stack.
To take out fragment 2 from the stack, do the following hidden operations:
go back to 1
go to 3 from 1
go to 4 from 3.
Hope this helps.