Get value from Bottom Sheet Dialog Fragment

Question

I'm starting bottomSheetDialogFragment from a fragment A. I want to select the date from that bottomSheetDialogFragment then set it in the fragment A.

The select date is already done, I just want to get it in the fragment A to set it in some fields.

How can I get the value? Any suggestions how to do it?

Answer 1

Create an interface class like this

public interface CustomInterface {

    public void callbackMethod(String date);
}

Implement this interface in your Activity or Fragment. and make an object of this Interface.

private CustomInterface callback;

Initialize it in onCreate or onCreateView

callback=this;

Now pass this callback in your BottomSheetDialogFragment constructor when you call it.

yourBottomSheetObject = new YourBottomSheet(callback);
yourBottomSheetObject.show(getSupportFragmentManager()," string");

Now in your BottomSheetFragment's constructor

private CustomInterface callback;

public SelectStartTimeSheet(CustomInterface callback){

this.callback=callback;

}

And at last use this callback object to set your date

callback.callbackMethod("your date");

and yout will recieve this date in your Fragment or Your Activity in callbackMethod function.

Answer 2

override the constructor of a fragment is a bad practice as the document said:

Every fragment must have an * empty constructor, so it can be instantiated when restoring its * activity's state.

if you using another constructor that passing a callback as the param, when the fragment is resotored by the framework, your app crash

the recommend way is using viewModel and livedata.