fragment-backstack

问题 I have a bottomnavigationview containing 5 fragments,(Consider A(Home), B, C, D, E) If I go to fragment D and then an Activity (Which is inside fragment D or C or any of 5) and press back button of the device. It is directly going to Home fragment(A), actually, it should go to fragment D or C. I have used botomnavigationview in my previous project but all things were working fine. Happening-- MainActivity+HomeFragment (A)---> Fragment D-->>Activity--->>OnbackPressed--->>HomeFragment Expected-

问题 This question already has an answer here : Lifecycle of a replaced ViewPager and BackStack? (1 answer) Closed 4 years ago . I'm using a TabLayout in one of my fragments with a viewPager to switch between two fragments below the tabs. When I click the FAB inside one of the lower fragments, I load a new fragment (for input). However- when I press the BACK button, the TabLayout shows up but WITHOUT either of the lower fragments (represented by the pages). So what am I doing wrong? and is there a

问题 My problem is generally described in this question: Once for all, how to correctly save instance state of Fragments in back stack? But i can't understand how the accepted answer is related to it. To keep it short: There are 2 fragments A and B. I go from A to B using transaction.replace() and add transaction to backstack. I rotate screen -> fragment A is not visible, but it's onSaveInstanceState is called - everything ok up to this point. I rotate screen again. Again A's onSaveInstanceState

问题 I'm implementing BottomNavigationView for navigation in an Android app. I am using Fragments to set the content for each tab. I know how to set up one fragment for each tab and then switch fragments when a tab is clicked. But how can I have a separate back stack for each tab? Here is the code to set up one fragment: Fragment selectedFragment = ItemsFragment.newInstance(); FragmentTransaction transaction = getSupportFragmentManager().beginTransaction(); transaction.replace(R.id.content,

问题 I'm scratching my head with this one now.... I have an ActionBarActivity that loads an initial Fragment - the original menu is inflated within the activity. Now, I have a navigation bar that, when an item is selected, loads a different fragment and adds this to the backstack. When I do this, there are a couple of things I want to set: Set the home as up indicator Invalidate the options menu from the main activity Set has options to true for the Fragment Ensure that the up indicator correctly

问题 I have used multiple Fragments in my Project. I want to save a Fragment's state and restore this state when I come back to this. In this Fragment I show multiple images which change on button click. I use the following code for this: String backStateName = fragment.getClass().getName(); FragmentManager fragmentManager = getSupportFragmentManager(); boolean fragmentPopped = fragmentManager.popBackStackImmediate(backStateName, 0); if (!fragmentPopped) { FragmentTransaction fragmentTransaction =

问题 The problem is to manage properly back stack so the previous fragment is poped out (or deleted). The problem is in their overlapping.. The structure of program as follows: sliding menu with 3 fragments for each section: CatalogFragment , NewsFragment , BlogFragment ; each fragment is a listView with items (parsed from JSON); on CatalogFragment 's item click I need to replace this CatalogFragment with LessonsFragment , which is list also. p.s. Items is in russian but I think you can understand

问题 I have a strange issue, I have 2 fragment, in first fragment, I have some custom EditText , and a button to replace this by second fragment ( addToBackStack = true), then, in second fragment, I try to using popBackStack() to back to first fragment, the issue occur, all custom EditText have same value. Below is all my code FirstFragment class FirstFragment : BaseFragment() { override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { return

问题 I'm using the Android Compatibility library to implement fragments and have extended the layout sample so that a fragment contains a button which fires off another fragment. In the selection pane on the left I have 5 selectable items - A B C D E . Each loads up a fragment (via FragmentTransaction:replace ) in the details pane - a b c d e Now I've extended fragment e to contain a button which loads up another fragment e1 also in the details pane. I've done this on fragment e 's onClick method

问题 I working on my first app and got problems with the "back" function. When i open the app an click in the menu to another fragment (2,3 or 4) and i push the back button the app crashes. When i start the app and click 2 > 3 > 4 (in this order) in the menu and push the back button i go back to 3 > 2 > crash . The app crashes when i go back to the mainFragment which contains a google map. I think my problem has something to do with the googlemap in this fragment (the fragment to navigate back to)