android - Keep fragment state/data in BottomNavigationView - 


i've mainactivity following layout:          <?xml version="1.0" encoding="utf-8"?>     <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"         xmlns:app="http://schemas.android.com/apk/res-auto"         xmlns:tools="http://schemas.android.com/tools"         android:id="@+id/container"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:orientation="vertical"         android:background="@color/lighter_gray"         tools:context="com.rewardsme.merchant.activities.mainactivity">          <framelayout             android:layout_margintop="?attr/actionbarsize"             android:id="@+id/content"             android:layout_width="match_parent"             android:layout_height="0dp"             android:layout_weight="1">              <linearlayout                 android:id="@+id/fragment"                 android:layout_width="match_parent"                 android:layout_height="match_parent"                 android:orientation="vertical"></linearlayout>          </framelayout>          <android.support.design.widget.bottomnavigationview             android:id="@+id/navigation"             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:layout_gravity="bottom"             android:background="?android:attr/windowbackground"             app:menu="@menu/navigation" />      </linearlayout>  i've got 3 tabs in bottomnavigationview; 3 fragments. want keep data , state of each fragment, during transaction, instagram application. mean, if load database data in fragment a, move fragment b , come fragment a, want see state. how can perform this?  **update**

these lines of code handle selection of fragment , transaction. these lines of code in mainactivity , newinstance static method. fragment1, fragment2 , fragment3 3 different fragments, different layout , backend. said before, want keep state of fragment during usage of app, instagram app.

        private bottomnavigationview.onnavigationitemselectedlistener monnavigationitemselectedlistener                 = new bottomnavigationview.onnavigationitemselectedlistener() {              @override             public boolean onnavigationitemselected(@nonnull menuitem item) {                 switch (item.getitemid()) {                     case r.id.navigation_1:                         changefragment(getsupportfragmentmanager(), fragment1.newinstance(), r.id.container);                         return true;                     case r.id.navigation_2:                                             changefragment(getsupportfragmentmanager(), fragment2.newinstance(), r.id.container);                      case r.id.navigation_profile:                                             changefragment(getsupportfragmentmanager(),fragment3.newinstance(),  r.id.container);                         return true;                 }                 return false;             }          }; public static void changefragment(fragmentmanager fragmentmanager,                                              fragment fragment, int frameid){         fragmenttransaction transaction = fragmentmanager.begintransaction();         transaction.replace(frameid, fragment);         transaction.commit();     }


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