Send data from activity to fragment in Android

Question

I have two classes  First is activity  second is a fragment where I have some EditText  In activity I have a subclass with async-task and in method doInBackground I get some result  which I save to variable  How can I send this variable from subclass  my activity  to this fragment

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From Activity you send data with Bundle as   Bundle bundle   new Bundle    bundle putString  data    Data you want to send        Your fragment MyFragment obj   new MyFragment    obj setArguments bundle     And in Fragment onCreateView method get the data    Override public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState         String data   getArguments   getString  data      data which sent from activity       return inflater inflate R layout myfragment  container  false

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If an activity needs to make a fragment perform an action after initialization  the easiest way is by having the activity invoke a method on the fragment instance  In the fragment  add a method   public class DemoFragment extends Fragment     public void doSomething String param             do something in fragment         and then in the activity  get access to the fragment using the fragment manager and call the method   public class MainActivity extends FragmentActivity        Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           DemoFragment fragmentDemo    DemoFragment               getSupportFragmentManager   findFragmentById R id fragmentDemo           fragmentDemo doSomething  some param              and then the activity can communicate directly with the fragment by invoking this method

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I would like to add for the beginners that the difference between the 2 most upvoted answers here is given by the different use of a fragment   If you use the fragment within the java class where you have the data you want to pass  you can apply the first answer to pass data   Bundle bundle   new Bundle    bundle putString  edttext    From Activity    Fragmentclass fragobj   new Fragmentclass    fragobj setArguments bundle     If however you use for example the default code given by Android Studio for tabbed fragments  this code will not work   It will not work even if you replace the default PlaceholderFragment with your FragmentClasses  and even if you correct the FragmentPagerAdapter to the new situation adding a switch for getItem   and another switch for getPageTitle    as shown here   Warning  the clip mentioned above has code errors  which I explain later here  but is useful to see how you go from default code to editable code for tabbed fragments   The rest of my answer makes much more sense if you consider the java classes and xml files from that clip  representative for a first use of tabbed fragments by a beginner scenario    The main reason the most upvoted answer from this page will not work is that in that default code for tabbed fragments  the fragments are used in another java class  FragmentPagerAdapter   So  in order to send the data  you are tempted to create a bundle in the MotherActivity and pass it in the FragmentPagerAdapter  using answer no 2   Only that is wrong again   Probably you could do it like that  but it is just a complication which is not really needed    The correct easier way to do it  I think  is to pass the data directly to the fragment in question  using answer no 2  Yes  there will be tight coupling between the Activity and the Fragment  BUT  for tabbed fragments  that is kind of expected  I would even advice you to create the tabbed fragments inside the MotherActivity java class  as subclasses  as they will never be used outside the MotherActivity  - it is easy  just add inside the MotherActivity java class as many Fragments as you need like this    public static class Tab1 extends Fragment        public Tab1                 Override     public View onCreateView LayoutInflater inflater  ViewGroup container                               Bundle savedInstanceState            View rootView   inflater inflate R layout your layout name for fragment 1  container  false           return rootView             So  to pass data from the MotherActivity to such a Fragment you will need to create private Strings Bundles above the onCreate of your Mother activity - which you can fill with the data you want to pass to the fragments  and pass them on via a method created after the onCreate  here called getMyData      public class MotherActivity extends Activity        private String out      private Bundle results        Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity mother activity              for example get a value from the previous activity         Intent intent   getIntent            out   intent getExtras   getString  Key                public Bundle getMyData             Bundle hm   new Bundle            hm putString  val1  out           return hm            And then in the fragment class  you use getMyData   public static class Tab1 extends Fragment                          The fragment argument representing the section number for this            fragment                      public Tab1                         Override         public View onCreateView LayoutInflater inflater  ViewGroup container                                   Bundle savedInstanceState                View rootView   inflater inflate R layout your layout name for fragment 1  container  false               TextView output    TextView rootView findViewById R id your id for a text view within the layout                MotherActivity activity    MotherActivity getActivity                 Bundle results   activity getMyData                String value1   results getString  val1                 output setText value1               return rootView                    If you have database queries I advice you to do them in the MotherActivity  and pass their results as Strings Integers attached to keys inside a bundle as shown above   as inside the tabbed fragments  your syntax will become more complex  this becomes getActivity   for example  and getIntent becomes getActivity   getIntent   but you have also the option to do as you wish   My advice for beginners is to focus on small steps  First  get your intent to open a very simple tabbed activity  without passing ANY data  Does it work  Does it open the tabs you expect  If not  why    Start from that  and by applying solutions such as those presented in this clip  see what is missing  For that particular clip  the mainactivity xml is never shown  That will surely confuse you  But if you pay attention  you will see that for example the context  tools context  is wrong in the xml fragment files  Each fragment XML needs to point to the correct fragment class  or subclass using the separator      You will also see that in the main activity java class you need to add tabLayout setupWithViewPager mViewPager  - right after the line TabLayout tabLayout    TabLayout  findViewById R id tabs   without this line  your view is actually not linked to the XML files of the fragments  but it shows ONLY the xml file of the main activity    In addition to the line in the main activity java class  in the main activity XML file you need to change the tabs to fit your situation  e g  add or remove TabItems    If you do not have tabs in the main activity XML  then possibly you did not choose the correct activity type when you created it in the first place  new activity - tabbed activity    Please note that in the last 3 paragraphs I talk about the video  So when I say main activity XML  it is the main activity XML in the video  which in your situation is the MotherActivity XML file

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If you pass a reference to the  concrete subclass of  fragment into the async task  you can then access the fragment directly     Some ways of passing the fragment reference into the async task    If your async task is a fully fledged class  class FooTask extends AsyncTask   then pass your fragment into the constructor  If your async task is an inner class  just declare a final Fragment variable in the scope the async task is defined  or as a field of the outer class   You ll be able to access that from the inner class

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I ran into a similar issue while using the latest Navigation architecture component  Tried out all the above-mentioned code with passing a bundle from my calling activity to Fragment   The best solution  following the latest development trends in Android  is by using View Model  part of Android Jetpack    Create and Initialize a ViewModel class in the parent Activity  Please note that this ViewModel has to be shared between the activity and fragment    Now  Inside the onViewCreated   of the fragment  Initialize the Same ViewModel and setup Observers to listen to the ViewModel fields   Here is a helpful  in-depth tutorial if you need   https   medium com mindorks how-to-communicate-between-fragments-and-activity-using-viewmodel-ca733233a51c

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The best and convenient approach is calling fragment instance and send data at that time  every fragment by default have instance method     For example     if your fragment name is MyFragment   so you will call your fragment from activity like this    getSupportFragmentManager   beginTransaction   add R id container  MyFragment newInstance  data1   data2    MyFragment   commit       R id container is a id of my FrameLayout  so in MyFragment newInstance  data1   data2   you can send data to fragment and in your fragment you get this data in MyFragment newInstance String param1  String param2   public static MyFragment newInstance String param1  String param2            MyFragment fragment   new MyFragment            Bundle args   new Bundle            args putString ARG PARAM1  param1           args putString ARG PARAM2  param2           fragment setArguments args           return fragment          and then in onCreate method of fragment you ll get the data     Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           if  getArguments      null                mParam1   getArguments   getString ARG PARAM1               mParam2   getArguments   getString ARG PARAM2                        so now mParam1 have data1 and mParam2 have data2      now you can use this mParam1 and mParam2  in your fragment

User · Answer

Use following interface to communicate between activity and fragment  public interface BundleListener       void update Bundle bundle       Bundle getBundle        Or use following this generic listener for two way communication using interface          Created by Qamar4P on 10 11 2017      public interface GenericConnector lt T E gt        T getData        void updateData E data       void connect GenericConnector lt T E gt  connector       fragment show method  public static void show AppCompatActivity activity            CustomValueDialogFragment dialog   new CustomValueDialogFragment            dialog connector    GenericConnector  activity          dialog show activity getSupportFragmentManager    CustomValueDialogFragment            you can cast your context to GenericConnector in onAttach Context  too  in your activity  CustomValueDialogFragment show this     in your fragment       Override     public void onCreate  Nullable Bundle savedInstanceState            super onCreate savedInstanceState           connector connect new GenericConnector                  Override             public Object getData                     return null                              Override             public void updateData Object data                                 Override             public void connect GenericConnector connector                                             public static void show AppCompatActivity activity  GenericConnector connector                CustomValueDialogFragment dialog   new CustomValueDialogFragment                dialog connector   connector              dialog show activity getSupportFragmentManager    CustomValueDialogFragment                Note  Never use it like    toString   toString   toString    way

User · Answer

You can make a setter method in the fragment  Then in the Activity  when you reference to the fragment  you call the setter method and pass it the data from you Activity

User · Answer

Smartest tried and tested way of passing data between fragments and activity is to create a variables example   class StorageUtil     public static ArrayList lt Employee gt  employees      Then to pass data from fragment to activity  we do so in the onActivityCreated method     a field created in the sending fragment ArrayList lt Employee gt  employees    Override     public void onActivityCreated  Nullable Bundle savedInstanceState            super onActivityCreated savedInstanceState            employees new ArrayList              java 7 and above syntax for arraylist else use employees new ArrayList lt Employee gt    for java 6 and below         Adding first employee         Employee employee new Employee  1   Andrew   Sam   1984-04-10   Male   Ghanaian            employees add employee            Adding second employee        Employee employee new Employee  1   Akuah   Morrison   1984-02-04   Female   Ghanaian             employees add employee            StorageUtil employees employees          Now you can get the value of StorageUtil employees from everywhere  Goodluck

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Also You can access activity data from fragment   Activity   public class MyActivity extends Activity        private String myString    hello         Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity my                          public String getMyData             return myString            Fragment   public class MyFragment extends Fragment         Override     public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState             MyActivity activity    MyActivity  getActivity            String myDataFromActivity   activity getMyData            return view

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Very old post  still I dare to add a little explanation that would had been helpful for me  Technically you can directly set members of any type in a fragment from activity  So why Bundle  The reason is very simple - Bundle provides uniform way to handle -- creating opening fragment -- reconfiguration  screen rotation  - just add initial updated bundle to outState in onSaveInstanceState   -- app restoration after being garbage collected in background  as with reconfiguration   You can  if you like experiments  create a workaround in simple situations but Bundle-approach just doesn t see difference between one fragment and one thousand on a backstack - it stays simple and straightforward  That s why the answer by  Elenasys is the most elegant and universal solution  And that s why the answer given by  Martin has pitfalls

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My solution is to write a static method inside the fragment   public TheFragment setData TheData data        TheFragment tf   new TheFragment        tf data   data      return tf      This way I am sure that all the data I need is inside the Fragment before any other possible operation which could need to work with it  Also it looks cleaner in my opinion

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You can create public static method in fragment where you will get static reference of that fragment and then pass data to that function and set that data to argument in same method and get data via getArgument on oncreate method of fragment  and set that data to local variables

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In your activity declare static variable  public static HashMap lt String ContactsModal gt  contactItems new HashMap lt String  ContactsModal gt       Then in your fragment do like follow  ActivityName contactItems put Number contactsModal

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the better approach for sending data from activity class to fragment is passing via setter methods  Like   FragmentClass fragmentClass   new FragmentClass    fragmentClass setMyList mylist   fragmentClass setMyString myString   fragmentClass setMyMap myMap     and get these data from the class easily

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just stumbled across this question  while most of the methods above will work  I just want to add that you can use the Event Bus Library  especially in scenarios where the component  Activity or Fragment  has not been created  its good for all sizes of android projects and many use cases  I have personally used it in several projects i have on playstore

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Sometimes you can receive Intent in your activity and you need to pass the info to your working fragment  Given answers are OK if you need to start the fragment but if it s still working  setArguments   is not very useful  Another problem occurs if the passed information will cause to interact with your UI  In that case you cannot call something like myfragment passData   because android will quickly tells that only the thread which created the view can interact with     So my proposal is to use a receiver  That way  you can send data from anywhere  including the activity  but the job will be done within the fragment s context   In you fragment s onCreate     protected DataReceiver dataReceiver  public static final String REC DATA    REC DATA     Override public void onCreate Bundle savedInstanceState          data Receiver   new DataReceiver        intentFilter   new IntentFilter REC DATA        getActivity   registerReceiver dataReceiver  intentFilter      private class DataReceiver extends BroadcastReceiver         Override     public void onReceive Context context  Intent intent             int data  intent getIntExtra  data   -1               Do anything including interact with your UI           In you activity      somewhere Intent retIntent   new Intent RE DATA   retIntent putExtra  data   myData   sendBroadcast retIntent

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From Activity  you send data with intent as   Bundle bundle   new Bundle    bundle putString  edttext    From Activity       set Fragmentclass Arguments Fragmentclass fragobj   new Fragmentclass    fragobj setArguments bundle     and in Fragment onCreateView method    Override public View onCreateView LayoutInflater inflater  ViewGroup container          Bundle savedInstanceState        String strtext   getArguments   getString  edttext            return inflater inflate R layout fragment  container  false

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This answer may be too late  but it will be useful for future readers   I have some criteria  I have coded for pick the file from intent  and selected file to be passed to particular fragment for further process  i have many fragments having the functionality of File picking  at the time   every time checking the condition and get the fragment and pass the value is quite disgusting  so   i have decided to pass the value using interface   Step 1  Create the interface on Main Activity      public interface SelectedBundle       void onBundleSelect Bundle bundle          Step 2  Create the SelectedBundle reference on the Same Activity     SelectedBundle selectedBundle    Step 3  create the Method in the Same Activity     public void setOnBundleSelected SelectedBundle selectedBundle           this selectedBundle   selectedBundle         Step 4  Need to initialise the SelectedBundle reference which are all fragment need filepicker functionality You place this code on your fragment onCreateView     method        MainActivity getActivity    setOnBundleSelected new MainActivity SelectedBundle                Override          public void onBundleSelect Bundle bundle                updateList bundle                        Step 5  My case  i need to pass the image Uri from HomeActivity to fragment  So  i used this functionality on onActivityResult method    onActivityResult from the MainActivity  pass the values to the fragments using interface   Note   Your case may be different  you can call it from any where from your HomeActivity     Override  protected void onActivityResult int requestCode  int resultCode  Intent  data           selectedBundle onBundleSelect bundle         Thats all  Implement every fragment you needed on the FragmentClass  You are great  you have done  WOW

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Basic Idea of using Fragments  F  is to create reusable self sustaining UI components in android applications  These Fragments are contained in activities and there are common best  way of creating communication path ways from A -  F and  F-A  It is a must to Communicate between F-F through a Activity because then only the Fragments become decoupled and self sustaining     So passing data from A -  F is going to be the same as explained by   s     K  In addition to that answer  After creation of the Fragments inside an Activity  we can also pass data to the fragments calling methods in Fragments    For example       ArticleFragment articleFrag    ArticleFragment                      getSupportFragmentManager   findFragmentById R id article fragment       articleFrag updateArticleView position

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I  ve found a lot of answers here   stackoverflow com but definitely this is the correct answer of   quot Sending data from activity to fragment in android quot   Activity          Bundle bundle   new Bundle            String myMessage    quot Stackoverflow is cool  quot           bundle putString  quot message quot   myMessage            FragmentClass fragInfo   new FragmentClass            fragInfo setArguments bundle           transaction replace R id fragment single  fragInfo           transaction commit     Fragment  Reading the value in the fragment          Override         public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState            Bundle bundle   this getArguments            String myValue   bundle getString  quot message quot                                                   or just          Override         public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState            String myValue   this getArguments   getString  quot message quot

[android] Send data from activity to fragment in Android

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