Hi!
Starting a new topic
from
https://groups.google.com/forum/?fromgroups#!topic/android-developers/WgokX2uhv88;
I have a situation where I'm using ViewPager to flip between fragments, and
two of the fragments have nested fragments.
Fragment nesting is done via getChildFragmentManager and orientation
changes work as expected (fragments implement onSaveInstanceState), but
when trying to pop the backstack after user interactions, I just get a
NullPointerException or an "IllegalStateException: Activity has been
destroyed" depending on whether I use popBackStack or popBackStackImmediate.
If I dump the child fragment state, it shows the activity as detached; If I
dump the "parent" fragment manager state, it shows all of the fragments and
also the activity reference (see below).
I'm using support library, and with that, I'm using classes from
android.support.v4.app package.
Child fragment state:
FragmentManager misc state:
mActivity=null
mContainer=android.support.v4.app.Fragment$1@41603ca0
mParent=MainFilesFragment{4169ccf0}
mCurState=0 mStateSaved=false mDestroyed=false
Parent fragment state:
Active Fragments in 414896e0:
#0: null
#1: ConnectFragment{41505ae0 #1 id=0x7f060001}
mFragmentId=#7f060001 mContainerId=#7f060001 mTag=null
mState=5 mIndex=1 mWho=android:fragment:1 mBackStackNesting=0
mAdded=true mRemoving=false mResumed=true mFromLayout=false
mInLayout=false
mHidden=false mDetached=false mMenuVisible=false mHasMenu=false
mRetainInstance=false mRetaining=false mUserVisibleHint=false
mFragmentManager=FragmentManager{414896e0 in MainActivity{41489470}}
mActivity=com.islonline.isllightdesign.MainActivity@41489470
mContainer=android.support.v4.view.ViewPager{4145c668 VFED.... ........
0,0-800,1033 #7f060001 app:id/pager}
mView=android.support.v4.app.NoSaveStateFrameLayout{414b1258 V.E.....
........ 800,0-1600,1033}
mInnerView=android.support.v4.app.NoSaveStateFrameLayout{414b1258
V.E..... ........ 800,0-1600,1033}
#2: MainFilesFragment{4155a430 #2 id=0x7f060001}
mFragmentId=#7f060001 mContainerId=#7f060001 mTag=null
mState=5 mIndex=2 mWho=android:fragment:2 mBackStackNesting=0
mAdded=true mRemoving=false mResumed=true mFromLayout=false
mInLayout=false
mHidden=false *mDetached=false* mMenuVisible=true mHasMenu=false
mRetainInstance=false mRetaining=false mUserVisibleHint=true
mFragmentManager=FragmentManager{414896e0 in MainActivity{41489470}}
*mActivity=com.islonline.isllightdesign.MainActivity@41489470*
mContainer=android.support.v4.view.ViewPager{4145c668 VFED.... ........
0,0-800,1033 #7f060001 app:id/pager}
mView=android.support.v4.app.NoSaveStateFrameLayout{4155bcf8 V.E.....
........ 1600,0-2400,1033}
mInnerView=android.support.v4.app.NoSaveStateFrameLayout{4155bcf8
V.E..... ........ 1600,0-2400,1033}
Child FragmentManager{4155b598 in MainFilesFragment{4155a430}}:
Active Fragments in 4155b598:
#0: ComputerListFragment{4155b7b8 #0 id=0x7f060010 COMPUTER_LIST}
mFragmentId=#7f060010 mContainerId=#7f060010 mTag=COMPUTER_LIST
mState=1 mIndex=0 mWho=android:fragment:2:0 mBackStackNesting=1
mAdded=false mRemoving=true mResumed=false mFromLayout=false
mInLayout=false
mHidden=false mDetached=false mMenuVisible=true mHasMenu=false
mRetainInstance=false mRetaining=false mUserVisibleHint=true
mFragmentManager=FragmentManager{4155b598 in
MainFilesFragment{4155a430}}
*mActivity=com.islonline.isllightdesign.MainActivity@41489470*
mParentFragment=MainFilesFragment{4155a430 #2 id=0x7f060001}
mSavedViewState=android.util.SparseArray@41690a60
#1: FileShareBrowserFragment{41690840 #1 id=0x7f060010}
mFragmentId=#7f060010 mContainerId=#7f060010 mTag=null
mState=5 mIndex=1 mWho=android:fragment:2:1 mBackStackNesting=1
mAdded=true mRemoving=false mResumed=true mFromLayout=false
mInLayout=false
mHidden=false mDetached=false mMenuVisible=true mHasMenu=false
mRetainInstance=false mRetaining=false mUserVisibleHint=true
mFragmentManager=FragmentManager{4155b598 in
MainFilesFragment{4155a430}}
*mActivity=com.islonline.isllightdesign.MainActivity@41489470*
mParentFragment=MainFilesFragment{4155a430 #2 id=0x7f060001}
mContainer=android.widget.FrameLayout{4155b210 V.E..... ........
0,0-800,1033 #7f060010 app:id/file_browser_container}
mView=android.support.v4.app.NoSaveStateFrameLayout{41698148
V.E..... ........ 0,0-800,1033}
mInnerView=android.support.v4.app.NoSaveStateFrameLayout{41698148
V.E..... ........ 0,0-800,1033}
#2: null
Added Fragments:
#0: FileShareBrowserFragment{41690840 #1 id=0x7f060010}
Back Stack:
#0: BackStackEntry{41690780 #0}
mName=null mIndex=0 mCommitted=true
Operations:
Op #0: REPLACE FileShareBrowserFragment{41690840 #1
id=0x7f060010}
Removed: ComputerListFragment{4155b7b8 #0 id=0x7f060010
COMPUTER_LIST}
Back Stack Indices:
#0: BackStackEntry{41690780 #0}
Thanks,
Miha.
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