How to write an object with an ArrayList<> attribute to Firebase database (Android)?

Question

I am trying to write a Spot object to my Firebase database. All was good an well until I added an ArrayList<> attribute to the Spot class. Now I can no longer write Spot object to the database and when I try, my app just.. stops. No crash, so I don't get any error feedback in the log :/

Here is my writing code:

public void writeSpot(Spot spot, AddSpotContract.RequiredModelOps subscriber) {
    Log.i("DBGR", "writing spot");
    getReference().child(spot.getId()).setValue(spot);
    Log.i("DBGR", "what is going on??");//if Spot object has an ArrayList<Uri> attribute, this is never reached
    subscriber.onSpotWritten();
}

So does anybody know why I can't write an object with an ArrayList<> attribute to the database? I've tried with an array, but that isn't supported (at least in that case I get the feedback to tell me that).

Thanks a lot :)

EDIT: I found the answer.

It actually had nothing to do with the ArrayList, the issue came from trying to write a Uri to the database, as it isn't a supported class (see error "java.lang.StackOverflowError:" when try to save object in Firebase Database)

Alex Mamo · Accepted Answer · 2017-06-14 10:06:17Z

1

In order to write data objects to your Firebase database, in stead of using a List, use a Map. If you have also in your pojo an Map field, change it to a Map.

Hope it helps.

answered Jun 14, 2017 at 10:06

Alex Mamo

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2 Comments

theopendle Over a year ago

Thanks Alex, your solution didn't work but it caused an error that I could actually use :)

theopendle Over a year ago

Yep, im not sure what the etiquette is to answer your own question, so I just made an edit. Thanks for the assist

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