Android- (Firebase) How to set structure an ArrayList differently?

Question

Currently, I am trying to develop an app that invites people to an event using firebase.

I have been using arraylist to set invited peoples' list like this:

friend_list = data.getStringExtra("friends_list");
friend_array = new ArrayList<String>(Arrays.asList(friend_list.split(",")));
newEvent.child("invited").setValue(friend_array);

Doing so, set the values on the Database like this:

invited:
        0: "JohnDoe1"
        1: "JohnDoe2"
        2: "JohnDoe3"
        3: "JohnDoe4"

However, I need it to be set like so:

invited:
        JohnDoe1: true
        JohnDoe2: true
        JohnDoe3: true
        JohnDoe4: true

Is there a way to maybe loop it so it becomes set like this? Thanks in advance.

Firebase is NoSQL DB so its works on key value pair, you are adding list so in your case (0,1,2,3..) is key — akhilesh0707
– akhilesh0707, Commented Aug 4, 2017 at 12:16

Alex Mamo · Accepted Answer · 2017-08-04 12:36:09Z

3

Because everything in a Firebase database is structured as pairs of key and value, i suggest you passing a map to the setValue() method and not an ArrayList like this:

String friend_list = data.getStringExtra("friends_list");
List<String> friend_array = new ArrayList<>(Arrays.asList(friend_list.split(",")));
Map<String, Boolean> map = new HashMap<>();
for(String s : friend_list) {
    map.put(s, true);
}
newEvent.child("invited").setValue(map);

As you probably see the declaration of the map is outsite the for loop.

This code will solve your problem for sure.

answered Aug 4, 2017 at 12:36

Alex Mamo

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Comments

akhilesh0707 · Accepted Answer · 2017-08-04 12:14:28Z

0

Try this will help you

String friend_list = data.getStringExtra("friends_list");
List<Map<String,Boolean>> friend_array = new ArrayList<>();
for(String userStr:Arrays.asList(friend_list.split(","))){
    Map<String,Boolean> userMap=new HashMap<>();
    userMap.put(userStr,true);
    friend_array.add(userMap);
}
newEvent.child("invited").setValue(friend_array);

answered Aug 4, 2017 at 12:14

akhilesh0707

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