I have a MainActivity with two tabs (using viewPager). In the second tab I have a mapFragment - Google Maps API. After clicking in a button it would open another fragment. However, the mapFragment is under the fragment (in log I see that the map is re-drawn).
Any suggestion how to solve it?
If you are using add() to go to the new fragment, replace it with replace().
See this example:
final FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.container, new NewFragment(), "NewFragment");
ft.commit();
Related
I have the following code that adds fragments to the same container R.id.container. First I add one fragment, then after user interacts with it, I add another one with the same code
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.container, fragment);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
My question when I cell getSupportFragmentManager().getFragments() I can see two fragments. Why doesn't replace actually replace but add?
It keeps the two fragments because
addToBackStack(null);
means the user is able to revert back to the previous state.
If you add fragment1 (using replace), then fragment2, only fragment2 is shown, but if the user press back, the FragmentManager needs to show fragment1, so it keeps a reference to both fragment.
Working with fragments I've always used replace() for my transactions, but I wish I didn't have to save instance states anymore to restore a fragment's view and prevent reloading when coming back to that fragment. So, I've decided to work with add(). The thing is when I add another fragment, the previous fragment view remains in the background and that's fine (that's the behavior I expected), but the problem is I can actually interact with the views in the background. Example:
Fragment A has a Button
Fragment B has a TextView
When I add Fragment A and later add Fragment B, I'm able to click on Fragment A's Button, even staying on Fragment B's view.
I'm using:
FragmentTransaction fragmentTransaction =
getSupportFragmentManager().beginTransaction().
add(getRootViewContainer(),fragment,fragment.getClass().getSimpleName());
if (shouldGoBack)
fragmentTransaction.addToBackStack(fragment.getClass().getSimpleName());
where getRootViewContainer() returns the id of the FrameLayout I'm using as my activity main container.
Now, is it really the default behavior of add()?
If so, is there a proper way to avoid this or one just has to use replace()?
What you can do here is just hide previous fragment at the time of transaction of current fragment.
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
Fragment newFragment= new MyFragment ();
ft.hide(CurrentFragment.this);
ft.show(newFragment);
ft.commit();
It worked for me just try it.
FragmentTransaction.hide(fragmentBehind); //works for me!
example :
//I have it globally available
FragmentTransaction trans = MainActivity.getManager().beginTransaction();
//not globally
FragmentTransaction trans = getFragmentManager().beginTransaction();
MapFragment newFragment = new newFragment();
trans.add(R.id.fragmentContainer, newFragment, tag);
trans.hide(this);
trans.addToBackStack(tag);
trans.commit();
Yes, this is a default behaviour of add().
If you really don't want to user replace(), you can try to disable views which are inside "old" fragment.
I have class Demo and I am extends the demo by FragmentActivity class. Also I have another class Fragment1 extends Fragment. And the onclick of button i am navigate from activity Demo to the Fragment Fragment1. Now I want to come back on Demo from the Fragment1. So how can I back to Demo activity?
Thanks.
Your question is lacking a lot of detail, so I'm taking a stab in the dark here, but...
I presume in your onClick code, you use the Fragment Manager to create a new Fragment Transaction, then add the fragment to that transaction and commit it?
Your problem with the activity being closed when you hit the back button is likely because your fragment was not added to something called the "back stack". You can find to documentation here http://developer.android.com/reference/android/app/FragmentTransaction.html#addToBackStack%28java.lang.String%29, but crucially the main thing you need to do is modify your code to include the line below:
FragmentManager fragmentManager = getFragmentManager()
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.add(R.id.fragment_container, new Fragment1());
fragmentTransaction.addToBackStack("Transaction ID"); // <-- This is key!
fragmentTransaction.commit();
Once that's done, Android will remember the adding of the fragment as a navigation act, and should reverse the transaction when the back button is hit.
If this wasn't what you're looking for, or if it doesn't work, please provide some more detail and some code samples and I can take another look.
Try adding the fragment you want to go back to manually to the backstack.
FragmentTransaction transaction = getFragmentManager().beginTransaction();
YourFragmentName myFragment = new YourFragmentName();
transaction.replace(R.id.fragment_container, myFragment);
//if you with to add it to backStack, do this, otherwise skip the line below
transaction.addToBackStack(null);
transaction.commit();
I have a actionbar tab setup with fragments for each of the pages. (extended default example from wizard).
I'm attempting to create a new fragment and make it the current fragment, with the other hidden
ConfigDetailSectionFragment configDetailSectionFragment = new ConfigDetailSectionFragment();
FragmentManager fragmentManager = getFragmentManager();
android.support.v4.app.FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.fragment_main_config, configDetailSectionFragment);
transaction.addToBackStack(null);
transaction.commit();
the code shows the new fragment but seems it is transparent and I can see the fragment below.
i'm probably forgetting to do something... what am i forgetting to do or am missing?
Adding an android:background="#FFFFFF" fixed the issue, per beworker. Thanks!
I have an activity with a FrameLayout in it.
The activity should show four steps, and each step is a Fragment. When I want to go back-further, I don't want my fragments to be recreated. I would like to retain them and simply replace their view in my fragment.
I used to first create my Fragments and add them in the backstack like this:
Fragment step= new Frag1ActCompleteFragsCommTrack();
FragmentTransaction ft= getSupportFragmentManager().beginTransaction();
ft.add(step, ""+onStepNr);
ft.addToBackStack(null);
ft.commit();
notice that I don't show it, I simply create it and add to the backstack.
So, once I need one of my fragments to show, I add it (in this example I don't remove any fragment from the framelayout just because it's my first add):
FragmentTransaction ft= getSupportFragmentManager().beginTransaction();
ft.add(R.id.my_frameLayout, step);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.commit();
So: the problem is that I obtain a
Caused by: java.lang.IllegalStateException: Fragment already added: Frag1ActCompleteFragsCommTrack{410dcb20 #0 id=0x7f050041 -1}
But I think I can't add directly into my framelayout the first time, otherwise the next time I replace it, I could lose my fragment. Am I right? So.. what's the best practice for retaining fragments that could interchange each other in a framelayout?
Ladies and gentlemen, I did it!
If you add a Fragment, and you want it to be shown in a framelayout, remember to put it in the Fragment backstack. That's it! If you replace it in the framelayout with another one, no worries: you can put it back by finding it thanks to its tag.
It was easier than I thought actually
//step is an int describing the step associated to the fragment I wanna place
FragmentTransaction ft= getSupportFragmentManager().beginTransaction();
ft.replace(R.id.act_complete_track_frameLayout, f, ""+step);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
if(firstAttach)
ft.addToBackStack(null);
ft.commit();
imagine a fragment with tag "1" replaced through the code above by a fragment with tag "2". If I want to go back to step1, I reuse that code by obtaining my old fragment with getSupportFragmentManager().findFragmentByTag("1")
To be short, I thought that FragmentTransaction.replace removed the fragment from the backstack as well. That seems not to be the case (luckily)
You can always do something like fragmentManager.putFragment(yourFragment);
If I understand correctly, you are trying to add all the fragments but not show them until you are ready. FragmentTransaction.add() doesn't exactly do that though. It will also be shown after its added. You should use hide() after adding each fragment, and then later you can use show() to make it visible, and hide() again to make other fragments invisible.
Like this:
Fragment step = new Frag1ActCompleteFragsCommTrack();
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.add(step, ""+onStepNr);
ft.hide(step);
ft.commit();
Then later:
Fragment step = getSupportFragmentManager().findFragmentByTag(""+onStepNr);
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.show(step);
// may want to hide other fragments here
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.commit();