Does anyone faced this problem Its happen on MainActivity Ma

Question

Does anyone faced this problem Its happen on MainActivity MainScreen I have research lots of solution but not work Code ``` lt activity android name= view MainActivity android screenOrientation= portrait android windowSoftInputMode= stateAlwaysHidden gt ``` ```Caused by java lang IllegalStateException The specified child already has a parent You must call removeView on the child s parent first at android view ViewGroup addViewInner ViewGroup java 4915 at android view ViewGroup addView ViewGroup java 4746 at androidx viewpager widget ViewPager addView ViewPager java 1485 at android view ViewGroup addView ViewGroup java 4686 at android view ViewGroup addView ViewGroup java 4659 at androidx fragment app FragmentStateManager createView FragmentStateManager java 326 at androidx fragment app FragmentManager moveToState FragmentManager java 1199 at androidx fragment app FragmentManager moveToState FragmentManager java 1368 at androidx fragment app FragmentManager moveFragmentToExpectedState FragmentManager java 1446 at androidx fragment app FragmentManager moveToState FragmentManager java 1509 at androidx fragment app FragmentManager dispatchStateChange FragmentManager java 2637 at androidx fragment app FragmentManager dispatchActivityCreated FragmentManager java 2589 at androidx fragment app FragmentController dispatchActivityCreated FragmentController java 247 at androidx fragment app FragmentActivity onStart FragmentActivity java 541 at androidx appcompat app AppCompatActivity onStart AppCompatActivity java 201 at com gg gapo view MainActivity onStart MainActivity kt 1213 at android app Instrumentation callActivityOnStart Instrumentation java 1334 at android app Activity performStart Activity java 6992 at android app ActivityThread performLaunchActivity ActivityThread java 2785 at android app ActivityThread handleLaunchActivity ActivityThread java 2897 at android app ActivityThread handleRelaunchActivity ActivityThread java 4769 at android app ActivityThread wrap18 Unknown Source 0 at android app ActivityThread$H handleMessage ActivityThread java 1604 at android os Handler dispatchMessage Handler java 105 at android os Looper loop Looper java 251 at android app ActivityThread main ActivityThread java 6572 at java lang reflect Method invoke Native Method at com android internal os Zygote$MethodAndArgsCaller run Zygote java 240 at com android internal os ZygoteInit main ZygoteInit java 767 ```

gildor · Answer

Hard to say anything without code this SO has answers for different cases when this error may happen

Sam · Answer

Thanks < gildor> sr about that I have to paste it on link below

gildor · Answer

It s a lot of code

Sam · Answer

< gildor> log said at line 1213 but I can not figure anythings about this code I have struggle around a month for this issue

Sam · Answer

My tracking on firebase said it often happen on background or different screen like PostDetails etc

gildor · Answer

your activity tries to restore fragment that is maybe you somehow reuse view which created by fragment

Sam · Answer

do you mean fragments in viewpager

gildor · Answer

yes some fragment see fragment manager tries to restore some fragemnt

Sam · Answer

< gildor> do you have any suggestion for this issues If I put all fragments to ArrayList as global variable do you think it can resolve this problem Thanks ``` private val fragments = arrayListOf lt Fragment gt private inner class HomePagerAdapter internal constructor fm FragmentManager FragmentStatePagerAdapter fm private var currentPrimary = 1 override fun getItem position Int Fragment return fragments position override fun setPrimaryItem container ViewGroup position Int `object` Any if currentPrimary = position currentPrimary = position fragments position userVisibleHint = true if position == 1 amp amp fragments position is VideoFragment fragments position as VideoFragment init override fun getCount Int return fragments size override fun destroyItem container ViewGroup position Int `object` Any super destroyItem container position `object` ``` ```private fun initFragments val initFeedIndex = if CommonPreferences getFeedPriority this MainActivity = FeedPriority NONE type CommonPreferences getFeedPriority this MainActivity else intent getIntExtra EXTRA DEFAULT FEED INDEX FEED INDEX DISCOVER index FEED INDEX DISCOVER index fragments add 0 NewsfeedFollowFragment newInstance initFeedIndex fragments add 1 VideoFragment newInstance fragments add 2 ConversationFragment newInstance false fragments add 3 NotificationFragment newInstance fragments add 4 AccountFragment newInstance UserPreferencies getUserId showBack = false loadInstantly = true accountListener = null startScreenName = ScreenName SCREEN TAB PROFILE NEW FEED type ```

gildor · Answer

Caching fragments is always wrong

gildor · Answer

You shouldn t cache them only create them when it created don t forget fragment is recreated automatically on restore state

gildor · Answer

I don t have any particular recommendation too many things happening in your code it looks that you reuse fragment or view when you shouldn t or maybe you create fragment every time manually instead of getting existing one created by fragment manager

Sam · Answer

Thanks < gildor>