How to pass values between Fragments

Question

I am pretty new to using Fragments   I am just trying to build a simple sample application that uses Fragments  My scenario is  I have two activities with one fragment inside each activity  The first fragment has an edittext and a button  The second fragment has a textview  When i enter a name in the edittext and click on the button  the textview in the second fragment should display the name entered in the edittext of the first fragment   I was able to send the value from first fragment to its activity and then from that activity to second activity  Now how do i use this value inside the second fragment   Here is the Java code      package com example fragmentexample   import android app Activity  import android app Fragment  import android app FragmentManager  import android content Intent  import android os Bundle  import android view LayoutInflater  import android view View  import android view View OnClickListener  import android view ViewGroup  import android widget Button  import android widget EditText  import android widget Toast   public class Fragment 1 extends Fragment       OnFragmentChangedListener mCallback          Container Activity must implement this interface     public interface OnFragmentChangedListener           public void onButtonClicked String name               Override     public void onAttach Activity activity            super onAttach activity               This makes sure that the container activity has implemented            the callback interface  If not  it throws an exception         try               mCallback    OnFragmentChangedListener  activity            catch  ClassCastException e                throw new ClassCastException activity toString                           must implement OnHeadlineSelectedListener                           Override     public View onCreateView LayoutInflater inflater  ViewGroup container              Bundle savedInstanceState               TODO Auto-generated method stub                View view   inflater inflate R layout fragment fragment 1  container  false            final EditText edtxtPersonName Fragment    EditText  view findViewById R id edtxtPersonName           Button btnSayHi Fragment    Button  view findViewById R id btnSayHi            btnSayHi Fragment setOnClickListener new OnClickListener                   Override             public void onClick View v                       TODO Auto-generated method stub                  String name   edtxtPersonName Fragment getText   toString                     FragmentManager fm   getFragmentManager                    Fragment 2 f2    Fragment 2  fm findFragmentById R id fragment content 2                    Activity activity   getActivity                     if activity    null                                        Toast makeText activity   Say amp ing Hi in Progress      Toast LENGTH LONG  show                                        if f2    null  amp  amp  f2 isInLayout                                          f2 setName name                                     else                                       mCallback onButtonClicked name                                                        return view               MainActivity Java  package com example fragmentexample   import android os Bundle  import android app Activity  import android content Intent   import android view Choreographer FrameCallback  import android view Menu   public class MainActivity extends Activity implements Fragment 1 OnFragmentChangedListener         Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main                    Override     public boolean onCreateOptionsMenu Menu menu               Inflate the menu  this adds items to the action bar if it is present          getMenuInflater   inflate R menu activity main  menu           return true              Override     public void onButtonClicked String name               TODO Auto-generated method stub          Intent i   new Intent this  SecondActivity class           i putExtra     name           startActivity i              SecondActivity Java  package com example fragmentexample   import android app Activity  import android os Bundle   public class SecondActivity extends Activity        Override     protected void onCreate Bundle savedInstanceState               TODO Auto-generated method stub         super onCreate savedInstanceState            setContentView R layout activity second            Bundle b   getIntent   getExtras             Fragment 2 f2   new Fragment 2            f2 setArguments b             Fragment 2 Java  package com example fragmentexample   import android app Activity  import android app Fragment  import android os Bundle  import android view LayoutInflater  import android view View  import android view ViewGroup  import android widget TextView   public class Fragment 2 extends Fragment       View view      TextView txtName         Override     public View onCreateView LayoutInflater inflater  ViewGroup container              Bundle savedInstanceState               TODO Auto-generated method stub          view   inflater inflate R layout fragment fragment 2  container  false                   Exception at this line         String name   getArguments   getString  message            txtName    TextView  view findViewById R id txtViewResult           txtName setText name            return view              Override     public void onAttach Activity activity               TODO Auto-generated method stub         super onAttach activity                     public void setName String name                   txtName setText  Hi     name              I get the following exception      04-16 18 10 24 573  E AndroidRuntime 713   FATAL EXCEPTION  main 04-16 18 10 24 573  E AndroidRuntime 713   java lang RuntimeException  Unable to start activity ComponentInfo com example fragmentexample com example fragmentexample SecondActivity   android view InflateException  Binary XML file line  8  Error inflating class fragment 04-16 18 10 24 573  E AndroidRuntime 713    at android app ActivityThread performLaunchActivity ActivityThread java 1815  04-16 18 10 24 573  E AndroidRuntime 713    at android app ActivityThread handleLaunchActivity ActivityThread java 1831  04-16 18 10 24 573  E AndroidRuntime 713    at android app ActivityThread access 500 ActivityThread java 122  04-16 18 10 24 573  E AndroidRuntime 713    at android app ActivityThread H handleMessage ActivityThread java 1024  04-16 18 10 24 573  E AndroidRuntime 713    at android os Handler dispatchMessage Handler java 99  04-16 18 10 24 573  E AndroidRuntime 713    at android os Looper loop Looper java 132  04-16 18 10 24 573  E AndroidRuntime 713    at android app ActivityThread main ActivityThread java 4123  04-16 18 10 24 573  E AndroidRuntime 713    at java lang reflect Method invokeNative Native Method  04-16 18 10 24 573  E AndroidRuntime 713    at java lang reflect Method invoke Method java 491  04-16 18 10 24 573  E AndroidRuntime 713    at com android internal os ZygoteInit MethodAndArgsCaller run ZygoteInit java 841  04-16 18 10 24 573  E AndroidRuntime 713    at com android internal os ZygoteInit main ZygoteInit java 599  04-16 18 10 24 573  E AndroidRuntime 713    at dalvik system NativeStart main Native Method  04-16 18 10 24 573  E AndroidRuntime 713   Caused by  android view InflateException  Binary XML file line  8  Error inflating class fragment 04-16 18 10 24 573  E AndroidRuntime 713    at android view LayoutInflater createViewFromTag LayoutInflater java 688  04-16 18 10 24 573  E AndroidRuntime 713    at android view LayoutInflater rInflate LayoutInflater java 724  04-16 18 10 24 573  E AndroidRuntime 713    at android view LayoutInflater inflate LayoutInflater java 479  04-16 18 10 24 573  E AndroidRuntime 713    at android view LayoutInflater inflate LayoutInflater java 391  04-16 18 10 24 573  E AndroidRuntime 713    at android view LayoutInflater inflate LayoutInflater java 347  04-16 18 10 24 573  E AndroidRuntime 713    at com android internal policy impl PhoneWindow setContentView PhoneWindow java 223  04-16 18 10 24 573  E AndroidRuntime 713    at android app Activity setContentView Activity java 1786  04-16 18 10 24 573  E AndroidRuntime 713    at com example fragmentexample SecondActivity onCreate SecondActivity java 13  04-16 18 10 24 573  E AndroidRuntime 713    at android app Activity performCreate Activity java 4397  04-16 18 10 24 573  E AndroidRuntime 713    at android app Instrumentation callActivityOnCreate Instrumentation java 1048  04-16 18 10 24 573  E AndroidRuntime 713    at android app ActivityThread performLaunchActivity ActivityThread java 1779  04-16 18 10 24 573  E AndroidRuntime 713        11 more 04-16 18 10 24 573  E AndroidRuntime 713   Caused by  java lang NullPointerException 04-16 18 10 24 573  E AndroidRuntime 713    at com example fragmentexample Fragment 2 onCreateView Fragment 2 java 24  04-16 18 10 24 573  E AndroidRuntime 713    at android app FragmentManagerImpl moveToState FragmentManager java 754  04-16 18 10 24 573  E AndroidRuntime 713    at android app FragmentManagerImpl moveToState FragmentManager java 956  04-16 18 10 24 573  E AndroidRuntime 713    at android app FragmentManagerImpl addFragment FragmentManager java 1035  04-16 18 10 24 573  E AndroidRuntime 713    at android app Activity onCreateView Activity java 4177  04-16 18 10 24 573  E AndroidRuntime 713    at android view LayoutInflater createViewFromTag LayoutInflater java 664  04-16 18 10 24 573  E AndroidRuntime 713        21 more   How do I get the value from the bundle in SecondActivity java to the Fragment 2 Java

User · Answer

The latest solution for passing data between fragments can be implemented by using android architectural components such as ViewModel and LiveData. With this solution, you don't need to define interface for communication and can get the advantages of using viewmodel like data survival due to configuration changes.

In this solution, the fragments involved in the communication share the same viewmodel object which is tied to their activity lifecycle. The view model object contains livedata object. One fragment sets data to be passed on livedata object and second fragment observers livedata changes and received the data.

Here is the complete example http://www.zoftino.com/passing-data-between-android-fragments-using-viewmodel

User · Answer

Passing arguments between fragments  This is a fairly late to answer this question but it could help someone  Fragment 1 java  Bundle i   new Bundle                 i putString  name    Emmanuel                 Fragment 1 frag   new Fragment 1                frag setArguments i               FragmentManager fragmentManager   getFragmentManager                fragmentManager beginTransaction                        replace R id content frame                               new Fragment 2                         commit      Then in your Fragment 2 java you can get the paramaters normally within your onActivityCreated  e g    Intent intent   getActivity   getIntent        if  intent getExtras      null            String name  intent getStringExtra  name

User · Answer

You can achieve your goal by ViewModel and Live Data which is cleared by Arnav Rao  Now I put an example to clear it more neatly    First  the assumed ViewModel is named SharedViewModel java   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            Then the source fragment is the MasterFragment java from where we want to send a data   public class MasterFragment extends Fragment       private SharedViewModel model       public void onViewCreated  NonNull View view  Bundle savedInstanceState            super onViewCreated view  savedInstanceState           model   new ViewModelProvider requireActivity    get SharedViewModel class           itemSelector setOnClickListener item - gt                    Data is sent              model select item                         And finally the destination fragment is the DetailFragment java to where we want to receive the data    public class DetailFragment extends Fragment        public void onViewCreated  NonNull View view  Bundle savedInstanceState            super onViewCreated view  savedInstanceState           SharedViewModel model   new ViewModelProvider requireActivity    get SharedViewModel class           model getSelected   observe getViewLifecycleOwner      item - gt                 Data is received

User · Answer

Kotlin way  Use a SharedViewModel proposed at the official ViewModel documentation     It s very common that two or more fragments in an activity need to   communicate with each other  Imagine a common case of master-detail   fragments  where you have a fragment in which the user selects an item   from a list and another fragment that displays the contents of the   selected item  This case is never trivial as both fragments need to   define some interface description  and the owner activity must bind   the two together  In addition  both fragments must handle the scenario   where the other fragment is not yet created or visible       This common pain point can be addressed by using ViewModel objects    These fragments can share a ViewModel using their activity scope to   handle this communication   First implement fragment-ktx to instantiate your viewmodel more easily  dependencies       implementation  androidx fragment fragment-ktx 1 2 2       Then  you just need to put inside the viewmodel the data you will be sharing with the other fragment  class SharedViewModel   ViewModel         val selected   MutableLiveData lt Item gt         fun select item  Item            selected value   item           Then  to finish up  just instantiate your viewModel in each fragment  and set the value of selected from the fragment you want to set the data  Fragment A  class MasterFragment   Fragment          private val model  SharedViewModel by activityViewModels        override fun onViewCreated view  View  savedInstanceState  Bundle             super onViewCreated view  savedInstanceState          itemSelector setOnClickListener   item - gt          model select item                     And then  just listen for this value at your Fragment destination  Fragment B   class DetailFragment   Fragment              private val model  SharedViewModel by activityViewModels            override fun onViewCreated view  View  savedInstanceState  Bundle                 super onViewCreated view  savedInstanceState              model selected observe viewLifecycleOwner  Observer lt Item gt    item - gt                     Update the UI                                  You can also do it in the opposite way

User · Answer

Passing data from Fragment to another Fragment   From first Fragment     Set data to pass MyFragment fragment   new MyFragment      Your Fragment Bundle bundle   new Bundle    bundle putInt  year   2017      Key  value fragment setArguments bundle       Pass data to other Fragment getFragmentManager     beginTransaction     replace R id content  fragment    commit      On Second Fragment   Override public void onCreate  Nullable Bundle savedInstanceState         super onCreate savedInstanceState         Bundle bundle   this getArguments         if  bundle    null             Int receivedYear   bundle getInt  year           Key  default value

User · Answer

This is a stone age question and yet still very relevant  Specially now that Android team is pushing more towards adhering to single activity models  communication between the fragments becomes all the more important  LiveData and Interfaces are perfectly fine ways to tackle this issue  But now Google has finally addressed this problem and tried to bring a much simpler solution using FragmentManager  Here s how it can be done in Kotlin  In receiver fragment add a listener  setFragmentResultListener       quot data request key quot       lifecycleOwner      FragmentResultListener   requestKey  String  bundle  Bundle - gt             unpack the bundle and use data         val frag1Str   bundle getString  quot frag1 data key quot            In sender fragment frag1   setFragmentResult       quot data request key quot       bundleOf  quot frag1 data key quot  to value     Remember this functionality is only available in fragment-ktx version 1 3 0-alpha04 and up  Credits and further reading  A New Way to Pass Data Between Fragments Android Fragments  Fragment Result

User · Answer

Bundle bundle   new Bundle    bundle putString  quot mykey quot   quot abc quot     bundle putString  quot mykey2 quot   quot abc quot       Put anything what you want  Fragment fragment   new Fragment    fragment2 setArguments bundle    getFragmentManager      beginTransaction      replace R id content  fragment2     commit     Bundle bundle   this getArguments       in your fragment oncreate  if bundle    null     String mykey   bundle getString  quot mykey quot      String mykey2   bundle getString  quot mykey2 quot

User · Answer

I think a good way to solve this problem is to use a custom interface   Lets say you have two fragments  A and B  which are inside of the same activity and you want to send data from A to B   Interface    public interface OnDataSentListener      void onDataSent Object data       Activity       public class MyActivity extends AppCompatActivity               private OnDataSentListener onDataSentListener                Override             protected void onCreate Bundle savedInstanceState                    super onCreate savedInstanceState                   setContentView R layout activity activity                    FragmentTransaction trans   getFragmentManager   beginTransaction                     FragmentA fa   new FragmentA                    FragmentB fb   new FragmentB                    fa setOnDataSentListener new Listeners OnDataSentListener                          Override                     public void onDataSent Object data                             if onDataSentListener    null   onDataSentListener onDataSent data                                                             transaction add R id frame a  fa                   transaction add R id frame b  fb                    transaction commit                               public void setOnDataSentListener OnDataSentListener listener                   this onDataSentListener   listener                            Fragment A   public class FragmentA extends Fragment       private OnDataSentListener onDataSentListener       private void sendDataToFragmentB Object data           if onDataSentListener    null  onDataSentListener onDataSent data              public void setOnDataSentListener OnDataSentListener listener           this onDataSentListener   listener            Fragment B   public class FragmentB extends Fragment       private void initReceiver              MyActivity  getActivity    setOnDataSentListener new OnDataSentListener                  Override             public void onDataSent Object data                      Here you receive the data from fragment A

User · Answer

Communicating between fragments is fairly complicated  I find the listeners concept a little challenging to implement    It is common to use a  Event Bus  to abstract these communications   This is a 3rd party library that takes care of this communication for you    Otto  is one that is used often to do this  and might be worth looking into  http   square github io otto

User · Answer

As noted at developer site  Often you will want one Fragment to communicate with another  for example to change the content based   on a user event  All Fragment-to-Fragment communication is done through the associated Activity  Two  Fragments should never communicate directly   communication between fragments should be done through the associated Activity  Let s have the following components   An activity hosts fragments and allow fragments communication FragmentA first fragment which will send data FragmentB second fragment which will receive datas from FragmentA  FragmentA s implementation is  public class FragmentA extends Fragment        DataPassListener mCallback           public interface DataPassListener          public void passData String data               Override     public void onAttach Context context                 super onAttach context              This makes sure that the host activity has implemented the callback interface            If not  it throws an exception         try                        mCallback    OnImageClickListener  context                    catch  ClassCastException e                         throw new ClassCastException context toString     quot  must implement OnImageClickListener quot                             public View onCreateView LayoutInflater inflater  ViewGroup container Bundle savedInstanceState                    Suppose that when a button clicked second FragmentB will be inflated            some data on FragmentA will pass FragmentB            Button passDataButton    Button                            passDataButton setOnClickListener new OnClickListener                  Override             public void onClick View v                    if  view getId      R id passDataButton                        mCallback passData  quot Text to pass FragmentB quot                                                         MainActivity implementation is  public class MainActivity extends ActionBarActivity implements DataPassListener            Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main                    if  findViewById R id container     null                if  savedInstanceState    null                    return                            getFragmentManager   beginTransaction                        add R id container  new FragmentA    commit                              Override     public void passData String data            FragmentB fragmentB   new FragmentB             Bundle args   new Bundle            args putString FragmentB DATA RECEIVE  data           fragmentB  setArguments args           getFragmentManager   beginTransaction                replace R id container  fragmentB                commit             FragmentB implementation is  public class FragmentB extends Fragment      final static String DATA RECEIVE    quot data receive quot       TextView showReceivedData            Override     public View onCreateView LayoutInflater inflater  ViewGroup container              Bundle savedInstanceState            View view   inflater inflate R layout fragment B  container  false           showReceivedData    TextView  view findViewById R id showReceivedData                   Override     public void onStart             super onStart            Bundle args   getArguments            if  args    null                showReceivedData setText args getString DATA RECEIVE                       I hope this will help

User · Answer

From Developers website      Often you will want one Fragment to communicate with another  for example to change the content based on a user event  All Fragment-to-Fragment communication is done through the associated Activity  Two Fragments should never communicate directly    You can communicate among fragments with the help of its Activity  You can communicate among activity and fragment using this approach   Please check this link also

User · Answer

This simple implementation helps to pass data between fragments in a simple way  Think you want to pass data from  Frgment1  to  Fragment2   In Fragment1 Set data to send    Bundle bundle   new Bundle     bundle putString  key   Jhon Doe       set your parameteres   Fragment2 nextFragment   new Fragment2     nextFragment setArguments bundle     FragmentManager fragmentManager   getActivity   getSupportFragmentManager     fragmentManager beginTransaction   replace R id content drawer  nextFragment  commit      In Fragment2 onCreateView method  Get parameteres   String value   this getArguments   getString  key     get your parameters Toast makeText getActivity    value      Toast LENGTH LONG  show     show data in tost

User · Answer

I  ve made something really easy for begginers like me  I made a textview in my activity main xml and put id index visibility invisible  then I get this textview from the first fragment index   Textview  getActivity   findviewbyid R id index  index setText  quot fill me with the value quot    and then in the second fragment I get the value index   Textview  getActivity   findviewbyid R id index  String get the value  index getText   toString

User · Answer

step 1 to send data from fragment to activity  Intent intent   new Intent getActivity   getBaseContext                            TargetActivity class                   intent putExtra  message   message                   getActivity   startActivity intent     step 2 to receive this data in Activity   Intent intent   getIntent    String message   intent getStringExtra  message      step 3  to send data from  activity to another activity follow normal approach  Intent intent   new Intent MainActivity this                          TargetActivity class                   intent putExtra  message   message                   startActivity intent     step 4 to receive this data in activity       Intent intent   getIntent      String message   intent getStringExtra  message      Step 5  From Activity you can send data to Fragment with intent as   Bundle bundle new Bundle    bundle putString  message    From Activity        set Fragmentclass Arguments Fragmentclass fragobj new Fragmentclass    fragobj setArguments bundle     and to receive in fragment in Fragment onCreateView method    Override     public View onCreateView LayoutInflater inflater  ViewGroup container      Bundle savedInstanceState              String strtext getArguments   getString  message         return inflater inflate R layout fragment  container  false

User · Answer

100  Working Solution    if help you then don t forget to hit upvote   In your First Fragment put this piece of code       editprofile setOnClickListener new View OnClickListener                      Override                 public void onClick View v                         Fragment editprofile Fragment   new Fragment editprofile                                Fragment getintentdetails tv name getText   toString                                tv mob getText   toString    tv email getText   toString    tv dob getText   toString                                tv gender getText   toString    photointent                                        In Second Fragment  make method like below   public void getintentdetails String name  String mobile  String email  String dob  String gender                                   String photointent             this name str  name          this mob str  mobile          this email str  email          this dob str  dob          this gender str  gender          this photo str  photointent           then define a variable at class level   String name str  mob str  dob str  photo str  email str  gender str    then make another method in second fragment to set value     setexistingdetails      private void setexistingdetails              if  name str equalsIgnoreCase                   et name  setText name str           if  mob str equalsIgnoreCase                  et mobile setText mob str           if  email str equalsIgnoreCase                  email et setText email str           if  dob str equalsIgnoreCase                  dob et setText dob str           if  gender str equalsIgnoreCase                   if  gender str equalsIgnoreCase  m                     male radio setChecked true                else                   female radio setChecked true                                   if  photo str equalsIgnoreCase                   try                   Picasso get   load Const BASE PATH  include sub-domain GENIUS   photo str  into adminpropic edit                 catch  Exception e

User · Answer

In Fragment 1 java  Bundle bundle   new Bundle    bundle putString  key   abc       Put anything what you want  Fragment 2 fragment2   new Fragment 2    fragment2 setArguments bundle    getFragmentManager          beginTransaction          replace R id content  fragment2         commit         In Fragment 2 java  Bundle bundle   this getArguments     if bundle    null           handle your code here      Hope this help you

User · Answer

First all answers are right  you can pass the data except custom objects by using Intent  If you want to pass the custom objects  you have to implement Serialazable or Parcelable to your custom object class  I thought it s too much complicated     So if your project is simple  try to use DataCache  That provides super simple way for passing data  Ref  Github project CachePot   1- Set this to View or Activity or Fragment which will send data  DataCache getInstance   push obj     2- Get data anywhere like below  public class MainFragment extends Fragment       private YourObject obj        Override     public void onCreate Bundle savedInstanceState                super onCreate savedInstanceState            obj   DataCache getInstance   pop YourObject class           end onCreate      end class MainFragment

[android] How to pass values between Fragments

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