How to pass value from one fragment to another

Question

I'm new to android and I have a hard time understanding how to pass value from fragment to another fragment. I have read other similar thread but I just can't seem to get it right. I have a datepicker fragment that I need to send some data to another fragment (itemfragment). I have this in datepicker fragment

@Override
public void onDateSet(DatePicker view, int year, int month, int date) {

    calendar.set(year, month + 1, date);

    int selDay = view.getDayOfMonth();
    int selMon = view.getMonth();
    int selYear = view.getYear();

    //set calendar to selected date
    Calendar c = Calendar.getInstance();
    c.set(selDay, selMon, selYear);
    c.add(Calendar.DATE, -1);
    Long twentyfourhrs = c.getTimeInMillis();
}

public interface sendValue{
    void sendData(Long twentyfourhrs);
}

sendValue sv;

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    try {
        sv = (sendValue) activity;
    }
    catch (ClassCastException e){
        throw new ClassCastException("implement sendValue method");
    }
}

Then in MainActivity

public class MainActivity extends AppCompatActivity implements DatePickerFragment.sendValue{

@Override
public void sendData(Long twentyfourhrs) {
    Bundle bundle = new Bundle();
    bundle.putLong("24", twentyfourhrs);
    ItemFragment if = new ItemFragment();
    if.setArguments(bundle);
}

in ItemFragment

Long reminder24;

public void setArguments(Bundle bundle){
    super.setArguments(bundle);
    reminder24 = bundle.getLong("24", twentyfourhrs);
}

AdapterView.OnItemSelectedListener listener = new AdapterView.OnItemSelectedListener() {

    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

if...{
...}
else{
if (reminder.equals("24 hours")) {
makeToast(reminder + " from " + selected_date + " is "  + reminder24);

I'm not sure what I did is correct or not but the reminder24 in toast came back as null. what did I do wrong?

Possible duplicate of [Best practice for instantiating a new Android Fragment](http://stackoverflow.com/questions/9245408/best-practice-for-instantiating-a-new-android-fragment) — OneCricketeer, Dec 06 '15 at 15:18
I found a solution that works for me http://stackoverflow.com/a/34993646/5563156 — Joan Z, Jan 28 '16 at 15:31
Okay. I fail to see how that answer is different than those here or the post I linked to — OneCricketeer, Jan 28 '16 at 17:33

score 1 · Answer 1 · edited Apr 27 '17 at 06:50

1

From Sending Fragment end use Bundle to send data from one fragment to another

Fragment fragment = new Fragment();
            Bundle args = new Bundle();
            args.putString("value", key);
            fragment.setArguments(args);

At the receiving Fragment to get data use this inside onCreateview() or onCreate() or onActivityCreated()

Bundle myData = this.getArguments();
String data = myData.getDouble("value","data");

edited Apr 27 '17 at 06:50

Rajesh Satvara

3,842
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answered Dec 07 '15 at 04:11

Pavan Bilagi

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but the value hasn't been entered during onCreate of the receiving fragment (ItemFragment). ItemFragment is where the user enter input. In ItemFragment, there's a button when user click will pop up datepicker dialog (hence the datepicker fragment). – Joan Z Dec 07 '15 at 09:34
use it in onCreateView() , 1st check whether your sending data or not , put some toast to check value for sending and receiving ends – Pavan Bilagi Dec 07 '15 at 12:10

score 0 · Answer 2 · answered Dec 06 '15 at 16:00

I don't know how are you passing the arguments to the fragment but these have to be received like this:

Bundle bundle = getArguments();
bundle.getLong(/*default value*/, /*key*/);

This is normally obtained inside onCreateView(); method.

Note: For a well practice you should declare variables with these modifiers public static final containing the key for the arguments you need to send.

How to pass value from one fragment to another

2 Answers2