How do I pass a boolean value from a DialogFragment to another Fragment in Android?

Question

I'm trying to make it so a clear button will open up an alert dialog which has a yes or no. When clicking the yes button, it should pass a bool value from the dialog frag to the other frag. If the value is true, which it should be when yes is clicked, it will call methods which will clear a database. Here is the dialog frag and the part of the frag where I'm trying to implement it. I can't get the dialog box to appear, but so far it does make the screen darker which I assume means I'm not hooking it up right.

Dialog frag:

public class DialogClear extends DialogFragment {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState){
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        LayoutInflater inflater = getActivity().getLayoutInflater();
        View dialogView = inflater.inflate(R.layout.clear_dialog, null);
        final Button yes = dialogView.findViewById(R.id.yes);
        final Button no = dialogView.findViewById(R.id.no);

        no.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                dismiss();
            }
        });

        yes.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                dismiss();
            }
        });

        return builder.create();
    }

}

Here is how I'm trying to call it from my frag

       clearButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                dialogClear = new DialogClear();
                dialogClear.setTargetFragment(BloodPressureFragment.this, 1);
                dialogClear.show(getFragmentManager(),"");

                    dataManager.clearDatabase();
                    dataManager.createDatabase();
                    dataText.setText("");
                    dataText.setBackgroundResource(R.drawable.no_border);
                    updateList();
                }

        });

Does this answer your question? [How to send data from DialogFragment to a Fragment?](https://stackoverflow.com/questions/18579590/how-to-send-data-from-dialogfragment-to-a-fragment) — Shashanth, Nov 16 '19 at 05:13
@Shashanth So do I create the interface inside the Dialog frag? — DoctorArnold, Nov 16 '19 at 05:48
Interface file you can create anywhere inside the project. You have to implement that interface inside caller activity/fragment. When you done with the job in your dialog fragment, pass the required value to the implementing method. — Shashanth, Nov 16 '19 at 05:55
ViewModel's can easily solve this problem and it will retain data even on Orientation change. — Anmol, Nov 16 '19 at 08:11

score 0 · Answer 1 · answered Nov 16 '19 at 05:19

0

welcome to code party

you have many choices to do this job, but i will show you best way for using fragments.

As you know, all fragments changes in one activity and extend from it.

So the easy way is this:

1.build public fields in your activity

2.build a getInstant method on activity

3.fill and get values of that activity from any fragments that you want show on this

see this example:

public boolean isLocationOn;

this field is build in activity now: in any fragment:

MainActivity.getInstance().isLocationOn = true;

in other fragment:

if(MainActivity.getInstance().isLocationOn){

 //todo show map or ...
}

in this way you can use anything in fragments

update me in comments

answered Nov 16 '19 at 05:19

alireza daryani

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1

how will you retain the data if orientation is changed? – Anmol Nov 16 '19 at 08:12
when orientation change, onViewCreate called in fragment and u can do this job and calling in there – alireza daryani Nov 16 '19 at 13:41
Activity instance will die and data attached to it will also get destroyed. You can save ur primitive/serialised data in bundle `onSaveInstanceState` but still the complex data still need's to be persisted in a DB or in android file system.So to solve all of the problem's and to keep the state of the application alive ViewModel's are best solution. – Anmol Nov 16 '19 at 13:51
when orientation changed, view will create again and data in activity never lose.watch the lifecycle of activity with fragments. – alireza daryani Nov 17 '19 at 04:47

score 0 · Answer 2 · answered Nov 16 '19 at 08:21

You should read and try using 3 thing's to solve this.

1. Navigation Component

easy to navigate to fragment's and DialogFragment

2. View Model

Share same View Model between different fragment's of an activity
Data is not lost on Orientation change's
All business logic at one place and easy to unit test

3. Live Data

recommended for responsive ui
Easy to understand Api's

How do I pass a boolean value from a DialogFragment to another Fragment in Android?

2 Answers2

1. Navigation Component

2. View Model

3. Live Data