CODEWITHSUNDEEP
javaandroidfirebasefirebase-realtime-database
Rahul Sonone
Rahul Sonone

Reputation: 2725

how to convert data to collection list from dataSnapshot, in Android FirebaseDatabase

I am getting list of data from firebase database using addValueEventListener, I got the data in dataSnapshot and I can call getValue to get the data, but is there any way I can directly convert it to Arraylist Right now I am doing like this 

public void onDataChange(DataSnapshot dataSnapshot) {
    for (DataSnapshot matchSnapShot: dataSnapshot.getChildren()) {
        Match match = matchSnapShot.getValue(Match.class);
        matchList.add(match);
    }
    Object obj= dataSnapshot.getValue();
    Toast.makeText(NewMatchActivity.this,"got data",Toast.LENGTH_LONG).show();
}

but I want some thing like this 

ArrayList<Match> matchList = dataSnapshot.getValue(ArrayList<Match.class>);

Upvotes: 2

Views: 1256

Answers (2)

Omar Aflak
Omar Aflak

Reputation: 2962

Try this:

GenericTypeIndicator<List<Match>> t = new GenericTypeIndicator<List<Match>>(){};
List<Match> matchList = dataSnapshot.getValue(t);

Upvotes: 1

Frank van Puffelen
Frank van Puffelen

Reputation: 598728

It depends a bit on your exact data structure (a representable snippet of the JSON as text would help for that), but most likely the data you are getting back is a Map and not a List.

public void onDataChange(DataSnapshot dataSnapshot) {
    Map<String,Match> map = (Map<String, Match>) dataSnapshot.getValue();
    Collection<Match> matches = map.values();
}

Upvotes: 1

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