如何将 boolean 值从 DialogFragment 传递到 Android 中的另一个片段？

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();
                }

        });

Answer 1

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

Answer 2

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