How to Insert new data in existing array in Firebase Database from Android?

Question

I'm Learning the Firebase Database with Android, Having array of data in Firebase Database Like Below image.

cineIndustry is an Array of data. In JSON it looks Like this

 "cineIndustry" : [ {
   "type" : "Hollywood"
 }, {
   "type" : "Kollywood"
 }, {
   "type" : "Bollywood"
 } ]

I want Insert new data in this Array.

POJO Class

@IgnoreExtraProperties
public class CineIndustry {

void CineIndustry(){}

public String type;

}

Save new data

CineIndustry cineIndustry = new CineIndustry();
cineIndustry.type = cineType.getText().toString();

mDatabase.setValue(cineIndustry);

When i insert like above it will replace Array. JSON Structure was change to normal JSON object instated of JSON Array.

Anyone know help me to solve this issue.

Alex Mamo · Accepted Answer · 2018-09-16 12:21:14Z

5

This is happening because you are overwriting the data. You are using the setValue() method, instead of using updateChildren() method.

Please do the following changes and your problem will be solved.

So, in order to write data objects to your Firebase database, instead of using an Array or a List, I suggest you using a Map. To save data, please use the following code:

DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference cineIndustryRef = rootRef.child("cineIndustry").push();
String key = cineIndustryRef.getKey();
Map<String, Object> map = new HashMap<>();
map.put(key, "Hollywood");
//and os on
cineIndustryRef.updateChildren(map);

As you can see, I have called updateChildren() method directly on the reference. In the end, the database should look like this:

Firebase-root
    |
    ---- cineIndustry
            |
            ---- pushedId1: "Hollywood"
            |
            ---- pushedId2: "Kollywood"
            |
            ---- pushedId2: "Bollywood"

edited Sep 16, 2018 at 12:21

answered Jun 22, 2017 at 8:54

Alex Mamo

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4 Comments

Yugesh Over a year ago

Can't insert the data i expect right. Insert data only like you suggest.

Yugesh Over a year ago

your answer is working fine. your structure is different and My structure is different. So, not possible create structure like "cineIndustry" : [ { "type" : "Hollywood" }, { "type" : "Kollywood" }, { "type" : "Bollywood" } ] this. Your answer is the only way right.

Alex Mamo Over a year ago

This is a proposal for changing the database. No, you cannot have different childrens with the same key, because in the case of a Map, it replaces the old value with the new one. So that why you need different keys.

Yugesh Over a year ago

Okay I'll go with your answer.

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