FragmentManager is already executing transactions. When is it safe to initialise pager after commit?

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I have an activity hosting two fragments. The activity starts off showing a loader while it loads an object. The loaded object is then passed to both fragments as arguments via newInstance methods and those fragments are attached.

final FragmentTransaction trans = getSupportFragmentManager().beginTransaction();
trans.replace(R.id.container1, Fragment1.newInstance(loadedObject));
trans.replace(R.id.container2, Fragment2.newInstance(loadedObject));
trans.commit();

The second fragment contains a android.support.v4.view.ViewPager and tabs. onResume we initialise it like follows

viewPager.setAdapter(adapter);
viewPager.setOffscreenPageLimit(adapter.getCount()); //the count is always < 4
tabLayout.setupWithViewPager(viewPager);

The problem is android then throws

java.lang.IllegalStateException: FragmentManager is already executing transactions

With this stack trace: (I took android.support out of the package names just for brevity)

v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:1620) at v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:637) at v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:143) at v4.view.ViewPager.populate(ViewPager.java:1235) at v4.view.ViewPager.populate(ViewPager.java:1083) at v4.view.ViewPager.setOffscreenPageLimit(ViewPager.java:847)

The data shows if setOffscreenPageLimit(...); is removed. Is there another way to avoid this issue?

When in the lifecycle is the fragment transaction complete so that I can wait to setup my pager?

If you're targeting sdk 24 and above you can use:

FragmentTransaction.commitNow()

instead of commit()

If you're targeting older versions, try calling:

FragmentManager.executePendingTransactions()

after the call to commit()

android – FragmentManager is already executing transactions , FragmentManager is already executing transactions. When is it safe to initialise pager after commit? Posted by: admin February 23, 2018 Leave a comment. java.lang.IllegalStateException: FragmentManager is already executing transactions I've read all StackOverflow questions about that, and nothing helped. Just wanted to share my experience public

Simply use childFragmentManger() for viewpager inside a Fragment

mPagerAdapter = new ScreenSlidePagerAdapter(getChildFragmentManager());
mPager.setAdapter(mPagerAdapter);

fragmentmanager is already executing transactions, android – FragmentManager is already executing transactions. When is it safe to initialise pager after commit? – in Android. If you're targeting  Questions: I have an activity hosting two fragments. The activity starts off showing a loader while it loads an object. The loaded object is then passed to both fragments as arguments via newInstance methods and those fragments are attached. final FragmentTransaction trans = getSupportFragmentManager().beginTransaction(); trans.replace(R.id.container1, Fragment1.newInstance(loadedObject

I had this exception when quickly replacing 2 fragments AND using executePendingTransactions(). Without calling this there was no exception.

What was my case? I open a fragment A and in its onResume() (under a condition) I ask the activity to replace the fragment with fragment B. At that point the exception occurs.

My solution was to use a Handler.post(runnable) which places the query on the end of the thread queue instead of running it immediately. This way we ensure that the new transaction will be executed after any previous transactions are completed.

So my solution was as simple as:

Handler uiHandler = new Handler();
uiHandler.post(new Runnable()
{
    @Override
    public void run()
    {
        openFragmentB(position);
    }
});

IllegalStateException: FragmentManager is already executing , When is it safe to initialise pager after commit? Tagged: Hello, I'm Niko Yuwono. [ Natty] android FragmentManager is already executing transactions By: . FragmentManager is already executing transactions. When is it safe to initialise pager after commit? (4) I have an activity hosting two fragments. The activity starts off showing a loader while it loads an object.

I Had a similar issue,

A mainAcitivity adding fragmentA.

Then fragmentA callback mainactivity to replace itself with fragmentB.

MainActivity throw exception "fragmentmanager already executing transaction" when replace and commit transaction with fragmentB.

The issue actually comes from fragmentB.

I have a TabHost in fragment B which require getfragmentmanager() to add tabfragment.

Replace getfragmentmanager() by getchildfragmentmanager() in fragmentB solve the issue.

fragmentmanager, FragmentManager is already executing transactions. When is it safe to initialise pager after commit? FragmentAdapter adapter = new  I do get the following Exception when executing my test code on a simple(?!) layout. If I simply use a new Fragment instance it all works just fine and passes the test. Caused by: java.lang.IllegalStateException: FragmentManager is already executing transactions at android.support.v4.app.FragmentManagerImpl.ensureExecReady(FragmentManager.java

If anyone is using Robolectric >3.6 and at least through 4.0.2 with a ViewPager you may see this even with correct code.

There is related information in this github issue tracking the problem for Robolectric.

The issue is not resolved as I write this answer, and the only workarounds known are to use @Config(sdk={27}) which appears to work for some but did not work for me, or implement a ViewPagerShadow with a workaround in your test package with the rather-long code referenced on github (I can include it here if that is better but this may not be relevant enough as an answer?) and use @Config(shadows={ShadowViewPager.class})

User marmor, Description I do get the following Exception when executing my test code on a simple(? FragmentManager is already executing transaction on Nov 10, 2018 mikehardy added a commit to mikehardy/Anki-Android that referenced Add Robolectric ViewPager shadow so CardTemplateEditor is testable Caused by: java.lang.IllegalStateException: FragmentManager is already executing transactions at android.app.FragmentManagerImpl.ensureExecReady(FragmentManager.java

User Hitesh Sahu, ViewPager with FragmentPagerAdapter. Overview. When is it safe to initialise pager after commit? FragmentManager is already executing transactions. 72 FragmentManager is already executing transactions. When is it safe to initialise pager after commit? 71 How to prevent RecyclerView item from blinking after

Slowing speed of Viewpager controller in android FragmentManager is already executing transactions. When is it safe to initialise pager after commit? NullPointerException in FragmentManager; FragmentManager is already executing transactions. When is it safe to initialise pager after commit? How to add/remove Fragment on Button click? java.lang.IllegalStateException(Can not perform this action after onSaveInstanceState) Why FragmentManager's getBackStackEntryCount() return zero?

FragmentManager is already executing transactions. When is it safe to initialise pager after commit? stackoverflow.com · 71 · How to make an Android device  "After a FragmentTransaction is committed with FragmentTransaction.commit(), it is scheduled to be executed asynchronously on the process's main thread. If you want to immediately executing any such pending operations, you can call ExecutePendingTransactions function (only from the main thread) to do so." Overlapping problem still occur.

Comments
  • apparently, the android ViewPager will promote a NullPointerException inside onCreateView of the fragment inside the pager to a IllegalStateException : FragmentManager is already executing transactions ... just in case someone drops by and needs to know
  • FragmentManager.executePendingTransactions() will also cause the exception, as inside its code there is a call to execPendingActions() --> ensureExecReady(true) --> if (mExecutingActions) { throw new IllegalStateException("FragmentManager is already executing transactions"); }
  • This not work for me. The two methods show the crash: java.lang.IllegalStateException: FragmentManager is already executing transactions
  • commitNow worked for me
  • Dude! You saved my day!! :D Thanks a ton! I was using Nested fragments and your "getChildFragmentManager" trick worked like charm! ^_^
  • This worked in the case where going 'back' (via back button) to the activity/fragment combo was crashing as well. Good call.
  • Simple and Great solution, You saved my time, Thanks.
  • Simple and effective. I have used postDelayed though. In my use case it was even better, since a lot of stuff is going on on initialisation phase
  • thanks! perfect solution!
  • This worked, but I wonder how does this fix the issue internally?