Receive result from DialogFragment

Question

I am using DialogFragments for a number of things  choosing item from list  entering text    What is the best way to return a value  i e  a string or an item from a list  back to the calling activity fragment    Currently I am making the calling activity implement DismissListener and giving the DialogFragment a reference to the activity  The Dialog then calls the OnDimiss method in the activity and the activity grabs the result from the DialogFragment object  Very messy and it doesn t work on configuration change  orientation change  as the DialogFragment loses the reference to the activity    Thanks for any help

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In Kotlin        My DialogFragment class FiltroDialogFragment   DialogFragment    View OnClickListener            var listener  InterfaceCommunicator    null      override fun onAttach context  Context             super onAttach context          listener   context as InterfaceCommunicator            interface InterfaceCommunicator           fun sendRequest value  String                override fun onClick v  View            when  v id                R id buttonOk - gt                  You can change value                              listener  sendRequest  send data                   dismiss                                                    My Activity class MyActivity  AppCompatActivity   FiltroDialogFragment InterfaceCommunicator        override fun sendRequest value  String                  Toast makeText this  value  Toast LENGTH LONG  show              I hope it serves  if you can improve please edit it  My English is not very good

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Or share ViewModel like showed here    public class SharedViewModel extends ViewModel       private final MutableLiveData lt Item gt  selected   new MutableLiveData lt Item gt          public void select Item item            selected setValue item              public LiveData lt Item gt  getSelected             return selected            public class MasterFragment extends Fragment       private SharedViewModel model      public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           model   ViewModelProviders of getActivity    get SharedViewModel class           itemSelector setOnClickListener item - gt                model select item                        public class DetailFragment extends Fragment       public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           SharedViewModel model   ViewModelProviders of getActivity    get SharedViewModel class           model getSelected   observe this    item - gt                Update the UI                        https   developer android com topic libraries architecture viewmodel sharing data between fragments

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As you can see here there is a very simple way to do that   In your DialogFragment add an interface listener like   public interface EditNameDialogListener       void onFinishEditDialog String inputText       Then  add a reference to that listener   private EditNameDialogListener listener    This will be used to  activate  the listener method s   and also to check if the parent Activity Fragment implements this interface  see below    In the Activity FragmentActivity Fragment that  called  the DialogFragment simply implement this interface   In your DialogFragment all you need to add at the point where you d like to dismiss the DialogFragment and return the result is this   listener onFinishEditDialog mEditText getText   toString     this dismiss      Where mEditText getText   toString   is what will be passed back to the calling Activity   Note that if you want to return something else simply change the arguments the listener takes   Finally  you should check whether the interface was actually implemented by the parent activity fragment    Override public void onAttach Context context        super onAttach context          Verify that the host activity implements the callback interface     try              Instantiate the EditNameDialogListener so we can send events to the host         listener    EditNameDialogListener  context        catch  ClassCastException e               The activity doesn t implement the interface  throw exception         throw new ClassCastException context toString                       must implement EditNameDialogListener              This technique is very flexible and allow calling back with the result even if your don t want to dismiss the dialog just yet

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Use myDialogFragment setTargetFragment this  MY REQUEST CODE  from the place where you show the dialog  and then when your dialog is finished  from it you can call getTargetFragment   onActivityResult getTargetRequestCode          and implement onActivityResult   in the containing fragment   It seems like an abuse of onActivityResult    especially as it doesn t involve activities at all  But I ve seen it recommended by official google people  and maybe even in the api demos  I think it s what g setTargetFragment   were added for

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I m very surprised to see that no-one has suggested using local broadcasts for DialogFragment to Activity communication  I find it to be so much simpler and cleaner than other suggestions  Essentially  you register for your Activity to listen out for the broadcasts and you send the local broadcasts from your DialogFragment instances  Simple  For a step-by-step guide on how to set it all up  see here

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Just to have it as one of the options  since no one mentioned it yet  - you could use an event bus like Otto  So in the dialog you do   bus post new AnswerAvailableEvent 42      And have your caller  Activity or Fragment  subscribe to it    Subscribe public void answerAvailable AnswerAvailableEvent event          TODO  React to the event somehow

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For anyone still reading this  setTargetFragment   has been deprecated  It is now recommended to use the FragmentResultListener API like this  override fun onCreate savedInstanceState  Bundle         super onCreate savedInstanceState      setFragmentResultListener  quot requestKey quot     key  bundle - gt          val result   bundle getString  quot resultKey quot              Do something with the result                           Somewhere show your dialog     MyDialogFragment newInstance   show parentFragmentManager   quot tag quot      Then in your MyDialogFragment set the result  button setOnClickListener      val result    quot some string quot      setFragmentResult  quot requestKey quot   bundleOf  quot resultKey quot  to result       dismiss

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Different approach  to allow a Fragment to communicate up to its Activity   1  Define a public interface in the fragment and create a variable for it  public OnFragmentInteractionListener mCallback   public interface OnFragmentInteractionListener       void onFragmentInteraction int id       2  Cast the activity to the mCallback variable in the fragment   try       mCallback    OnFragmentInteractionListener  getActivity      catch  Exception e        Log d TAG  e getMessage         3  Implement the listener in your activity  public class MainActivity extends AppCompatActivity implements DFragment OnFragmentInteractionListener           your code here     4  Override the OnFragmentInteraction in the activity   Override public void onFragmentInteraction int id        Log d TAG   received from fragment      id       More info on it  https   developer android com training basics fragments communicating html

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One easy way I found was the following  Implement this is your dialogFragment     CallingActivity callingActivity    CallingActivity  getActivity      callingActivity onUserSelectValue  insert selected value here      dismiss      And then in the activity that called the Dialog Fragment create the appropriate function as such    public void onUserSelectValue String selectedValue                TODO add your implementation        Toast makeText getBaseContext        selectedValue  Toast LENGTH LONG  show            The Toast is to show that it works  Worked for me

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if you want to send arguments and receive the result from second fragment  you may use Fragment setArguments to accomplish this task  static class FirstFragment extends Fragment       final Handler mUIHandler   new Handler              Override         public void handleMessage Message msg                switch  msg what                case 101     receive the result from SecondFragment                 Object result   msg obj                     do something according to the result                 break                                       void onStartSecondFragments             Message msg   Message obtain mUIHandler  101  102  103  new Object        replace Object with a Parcelable if you want to across Save Restore                                                                                   instance         putParcelable new SecondFragment    msg  show getFragmentManager   beginTransaction    null            static class SecondFragment extends DialogFragment       Message mMsg     arguments from the caller FirstFragment       Override     public void onViewCreated View view  Bundle savedInstanceState               TODO Auto-generated method stub         super onViewCreated view  savedInstanceState           mMsg   getParcelable this              void onClickOK             mMsg obj   new Object       send the result to the caller FirstFragment         mMsg sendToTarget             static  lt T extends Fragment gt  T putParcelable T f  Parcelable arg        if  f getArguments      null            f setArguments new Bundle               f getArguments   putParcelable  extra args   arg       return f    static  lt T extends Parcelable gt  T getParcelable Fragment f        return f getArguments   getParcelable  extra args

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In my case I needed to pass arguments to a targetFragment  But I got exception  Fragment already active   So I declared an Interface in my DialogFragment which parentFragment implemented  When parentFragment started a DialogFragment   it set itself as TargetFragment  Then in DialogFragment I called      Interface getTargetFragment    onSomething selectedListPosition

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There is a much simpler way to receive a result from a DialogFragment   First  in your Activity  Fragment  or FragmentActivity you need to add in the following information    Override public void onActivityResult int requestCode  int resultCode  Intent data           Stuff to do  dependent on requestCode and resultCode     if requestCode    1       1 is an arbitrary number  can be any int             This is the return result of your DialogFragment          if resultCode    1       1 is an arbitrary number  can be any int                  Now do what you need to do after the dialog dismisses                        The requestCode is basically your int label for the DialogFragment you called  I ll show how this works in a second   The resultCode is the code that you send back from the DialogFragment telling your current waiting Activity  Fragment  or FragmentActivity what happened   The next piece of code to go in is the call to the DialogFragment   An example is here   DialogFragment dialogFrag   new MyDialogFragment       This is the requestCode that you are sending  dialogFrag setTargetFragment this  1           This is the tag   dialog  being sent  dialogFrag show getFragmentManager     dialog      With these three lines you are declaring your DialogFragment  setting a requestCode  which will call the onActivityResult      once the Dialog is dismissed  and you are then showing the dialog   It s that simple   Now  in your DialogFragment you need to just add one line directly before the dismiss   so that you send a resultCode back to the onActivityResult     getTargetFragment   onActivityResult getTargetRequestCode    resultCode  getActivity   getIntent     dismiss      That s it   Note  the resultCode is defined as int resultCode which I ve set to resultCode   1  in this case     That s it  you can now send the result of your DialogFragment back to your calling Activity  Fragment  or FragmentActivity   Also  it looks like this information was posted previously  but there wasn t a sufficient example given so I thought I d provide more detail   EDIT 06 24 2016 I apologize for the misleading code above   But you most certainly cannot receive the result back to the activity seeing as the line   dialogFrag setTargetFragment this  1     sets a target Fragment and not Activity   So in order to do this you need to use implement an InterfaceCommunicator     In your DialogFragment set a global variable  public InterfaceCommunicator interfaceCommunicator    Create a public function to handle it  public interface InterfaceCommunicator       void sendRequestCode int code       Then when you re ready to send the code back to the Activity when the DialogFragment is done running  you simply add the line before you dismiss    your DialogFragment   interfaceCommunicator sendRequestCode 1      the parameter is any int code you choose    In your activity now you have to do two things  the first is to remove that one line of code that is no longer applicable   dialogFrag setTargetFragment this  1       Then implement the interface and you re all done   You can do that by adding the following line to the implements clause at the very top of your class   public class MyClass Activity implements MyDialogFragment InterfaceCommunicator   And then  Override the function in the activity     Override public void sendRequestCode int code           your code here     You use this interface method just like you would the onActivityResult   method   Except the interface method is for DialogFragments and the other is for Fragments

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Well its too late may be to answer but here is what i did to get results back from the DialogFragment  very similar to  brandon s answer  Here i am calling DialogFragment from a fragment  just place this code where you are calling your dialog   FragmentManager fragmentManager   getFragmentManager                categoryDialog setTargetFragment this 1               categoryDialog show fragmentManager   dialog      where categoryDialog is my DialogFragment which i want to call and after this in your implementation of dialogfragment place this code where you are setting your data in intent  The value of resultCode is 1 you can set it or use system Defined               Intent intent   new Intent                intent putExtra  listdata   stringData               getTargetFragment   onActivityResult getTargetRequestCode    resultCode  intent               getDialog   dismiss      now its time to get back to to the calling fragment and implement this method  check for data validity or result success if you want with resultCode and requestCode in if condition      Override     public void onActivityResult int requestCode  int resultCode  Intent data            super onActivityResult requestCode  resultCode  data                     do what ever you want here  and get the result from intent like below         String myData   data getStringExtra  listdata    Toast makeText getActivity   data getStringExtra  listdata   Toast LENGTH SHORT  show

[android] Receive result from DialogFragment

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