Send Data from Activity to Fragment in Android

Send data from activity to fragment in Android

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);
}

How to pass data from Activity to Fragment using bundle

While creating bundle:

Bundle bundle = new Bundle();
bundle.putString("userId", userId);
Fragment fragment = new Fragment();
fragment.setArguments(bundle);
getSupportFragmentManager().beginTransaction()
            .replace(R.id.fragment_placeholder_id, dataFragment, "anyTagName").commit();

The To get the data in your fragment:

if (getArguments != null) {
    String userId = getArguments().getString("userId");
}

How to pass data from Activity to Fragment with TabLayout

When starting the Fragment you can pass parameters through a bundle

/*ACTIVITY CODE*/
Bundle args = new Bundle();
args.putStringArrayList("argument_name", myListInString);
MyFragment fragment = new MyFragment();
fragment.setArguments(args);
fragment.show(fragmentTransaction, "fragment_tag")

And use them in your new snippet as follows

/* FRAGMENT CODE */
ArrayList<String> myList = getArguments.getStringArrayList("argument_name");
// ... FILL TABLE

How to pass data that changes real-time from activity to fragment?

class MyViewModel : ViewModel() {
    private val realtimedata = MutableLiveData<ByteArray>()

    val sensorData: LiveData<ByteArray> = realtimedata

    fun update(data: ByteArray){
        realtimedata.value = data
    }
}

class MainActivity: Activity() {

    private val viewModel: MyViewModel by viewModels()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        bluetoothSensorCallBack { data ->
            // Update the realtimedata 
            viewModel.update(data)
        }
    }
}

class SensordisplayFragment : Fragment() {

    // Use the 'by activityViewModels()' Kotlin property delegate
    // from the fragment-ktx artifact
    private val model: MyViewModel by activityViewModels()

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        model.sensorData.observe(viewLifecycleOwner, Observer<ByteArray> { data ->
            // Update the UI
        })
    }
}

Send data from Activity to Fragment already created

Just add a method in Fragment which you want to receive arguments, then invoke the method in Activity.

Activity's Code:

Fragment's Code:

How to send data from Activity to Fragment with ViewPager2?

My solution:

MainActivity:

pagerAdapter = new MainPagerAdapter(this);
pagerAdapter.setData(fragment1Container);

MainPagerAdapter:

public class MainPagerAdapter extends FragmentStateAdapter
{
    private Fragment1Container fragment1Container;
    private Fragment2Container fragment2Container;

    public void setData(Fragment1Container container)
    {
        fragment1Container = container;
    }

    public void setData(Fragment2Container container)
    {
        fragment2Container = container;
    }

    @NonNull
    @Override
    public Fragment createFragment(int position)
    {
        switch (position)
        {
            case 0:
                Fragment1 fragment1 = new Fragment1();

                Bundle bundle = new Bundle();
                Gson gson = new Gson();

                bundle.putString("fragment1Container", gson.toJson(fragment1Container));
                fragment1.setArguments(bundle);

                return fragment1;
            case 1:...

Fragment1:

private Fragment1Container fragment1Container;

if (bundle != null)
{
    Gson gson = new Gson();
    String jsonString = bundle.getString("fragment1Container");
    Type entityType = new TypeToken<Fragment1Container>(){}.getType();
    fragment1Container = gson.fromJson(jsonString , entityType );
}

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