Passing an Object from an Activity to a Fragment

Question

I have an Activity which uses a Fragment  I simply want to pass an object from this Activity to the Fragment   How could I do it  All the tutorials I ve seen so far where retrieving data from resources   EDIT    Let s be a bit more precise   My Activity has a ListView on the left part  When you click on it  the idea is to load a Fragment on the right part   When I enter this Activity  an Object Category is given through the Intent  This Object contains a List of other Objects Questions  which contains a List of String   These Questions objects are displayed on the ListView  When I click on one item from the ListView  I want to display the List of String into the Fragment  into a ListView    To do that  I call the setContentView   from my Activity with a layout  In this layout is defined the Fragment with the correct class to call  When I call this setContentView    the onCreateView   of my Fragment is called but at this time  the getArguments   returns null   How could I manage to have it filled before the call of onCreateView      tell me if I m not clear enough   Thanks

User · Answer

Get reference from the following example.

1. In fragment: Create a reference variable for the class whose object you want in the fragment. Simply create a setter method for the reference variable and call the setter before replacing fragment from the activity.

 MyEmployee myEmp;
 public void setEmployee(MyEmployee myEmp)
 {
     this.myEmp = myEmp;
 }

2. In activity:

   //we need to pass object myEmp to fragment myFragment

    MyEmployee myEmp = new MyEmployee();

    MyFragment myFragment = new MyFragment();

    myFragment.setEmployee(myEmp);

    FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
    ft.replace(R.id.main_layout, myFragment);
    ft.commit();

User · Answer

This one worked for me   In Activity   User user  public User getUser    return this user     In Fragment s onCreateView method   User user     MainActivity getActivity    getUser       Replace the MainActivity with your Activity Name

User · Answer

Create a static method in the Fragment and then get it using getArguments     Example   public class CommentsFragment extends Fragment     private static final String DESCRIBABLE KEY    describable key     private Describable mDescribable     public static CommentsFragment newInstance Describable describable        CommentsFragment fragment   new CommentsFragment        Bundle bundle   new Bundle        bundle putSerializable DESCRIBABLE KEY  describable       fragment setArguments bundle        return fragment          Override   public View onCreateView LayoutInflater inflater        ViewGroup container  Bundle savedInstanceState         mDescribable    Describable  getArguments   getSerializable          DESCRIBABLE KEY           The rest of your code     You can afterwards call it from the Activity doing something like   FragmentTransaction ft   getSupportFragmentManager   beginTransaction    Fragment fragment   CommentsFragment newInstance mDescribable   ft replace R id comments fragment  fragment   ft commit

User · Answer

To pass an object to a fragment  do the following   First store the objects in Bundle  don t forget to put implements serializable in class               CategoryRowFragment fragment   new CategoryRowFragment                    pass arguments to fragment             Bundle bundle   new Bundle                    event list we want to populate             bundle putSerializable  eventsList   eventsList                   the description of the row             bundle putSerializable  categoryRow   categoryRow                fragment setArguments bundle     Then retrieve bundles in Fragment   x000D   x000D            events that will be populated in this row x000D          mEventsList    ArrayList lt Event gt  getArguments   getSerializable  eventsList    x000D   x000D             description of events to be populated in this row x000D          mCategoryRow    CategoryRow getArguments   getSerializable  categoryRow    x000D   x000D   x000D

User · Answer

You should create a method within your fragment that accepts the type of object you wish to pass into it  In this case i named it  setObject   creative huh       That method can then perform whatever action you need with that object   MyFragment fragment    Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState            if  getSupportFragmentManager   findFragmentById android R id content     null                fragment   new MyFragment                getSupportFragmentManager   beginTransaction   add android R id content  detailsFragment                       commit              else              fragment    MyFragment  getSupportFragmentManager   findFragmentById                      android R id content                       fragment setObject yourObject     create a method like this in your class  MyFragment      Note that i m using the support library and calls to getSupportFragmentManager   might be just getFragmentManager   for you depending on what you re working with

User · Answer

Passing arguments by bundle is restricted to some data types  But you can transfer any data to your fragment this way   In your fragment create a public method like this  public void passData Context context  List lt LexItem gt  list  int pos        mContext   context      mLexItemList   list      mIndex   pos      and in your activity call passData   with all your needed data types after instantiating the fragment          WebViewFragment myFragment   new WebViewFragment            myFragment passData getApplicationContext    mLexItemList  index           FragmentManager fm   getSupportFragmentManager            FragmentTransaction ft   fm beginTransaction            ft add R id my fragment container  myFragment           ft addToBackStack null           ft commit      Remark  My fragment extends  android support v4 app Fragment   therefore I have to use  getSupportFragmentManager     Of course  this principle will work also with a fragment class extending  Fragment   but then you have to use  getFragmentManager

User · Answer

If the data should survive throughout the application lifecycle and shared among multiple fragments or activities  a Model class might come into consideration  which has got less serialization overhead   Check this design example

User · Answer

In your activity class   public class BasicActivity extends Activity    private ComplexObject co    Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout main page        co new ComplexObject        getIntent   putExtra  complexObject   co        FragmentManager fragmentManager   getFragmentManager        Fragment1 f1   new Fragment1        fragmentManager beginTransaction                replace R id frameLayout  f1  commit         Note  Your object should implement Serializable interface  Then in your fragment    public class Fragment1 extends Fragment    ComplexObject co    Override public View onCreateView LayoutInflater inflater  ViewGroup container          Bundle savedInstanceState        Intent i   getActivity   getIntent         co    ComplexObject  i getSerializableExtra  complexObject         View view   inflater inflate R layout test page  container  false       TextView textView    TextView  view findViewById R id DENEME       textView setText co getName          return view

[android] Passing an Object from an Activity to a Fragment

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