How to get a specific given in Firebase

Question

Example: I have a database that has name, email, but I want to know if this name matches a value that I put in an editText Help me Thanks so much!!

Check the answers for your queries, in stack overflow before posting a question. This can help you save downvotes — Myth, Nov 28 '16 at 12:57

score 1 · Accepted Answer · answered Nov 28 '16 at 13:11

1

First of all initiate the database instance

FirebaseDatabase firebaseDatabase = FirebaseDatabase.getInstance();

get the reference of your DB where you want to perform the operation

DatabaseReference dbRef = firebaseDatabase.getReference(NAME_OF_DATABASE);

then use this to get all the user with the name equal to the editText text

Query query = profileDbRef
            .orderByChild("name")
            .equalTo(edittext.getText().toString());
    query.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            for (DataSnapshot dataSnapshot1 : dataSnapshot.getChildren()) {
                Log.d(TAG, dataSnapshot1.getKey() + "  " + dataSnapshot1.getValue(Profile.class)
                        .toString());
               }
            }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });

answered Nov 28 '16 at 13:11

Tabish Hussain

852
5
13

Thank you so much!! – Jackson Miguel Nov 28 '16 at 22:31
Man, thank you very much I used this code and it worked in my project, however I wanted your help if possible in the following situation: I ordered some data from my database but I wanted it to be in the reverse order, that is, from the largest to the smallest. The biggest result: 100 The lowest result: 0 Would you help me or anybody? – Jackson Miguel Dec 04 '16 at 18:19
There is no way to reverse the data by using firebase query you have to do it manually.. or it you are using it for a recyclerView data source it can be done by LinearLayoutManager mManager = new LinearLayoutManager(getContext()); mManager.setReverseLayout(true); – Tabish Hussain Dec 05 '16 at 12:36
Thank you so much man! But how do this in ListView ? – Jackson Miguel Dec 05 '16 at 13:20
i got solve my problem! Your help was extremely important, thanks so much again! – Jackson Miguel Dec 06 '16 at 12:35

score 0 · Answer 2 · edited May 23 '17 at 12:02

I am not very familiar with Firebase, but I found this. I was able to find it pretty easily, so usually just search here once before posting.

You can have a look at this question.

Swift & Firebase | Checking if a user exists with a username

The question there was to do something similar using Swift. Might give you a good start. As for getting the value of the EditText, it is as simple as this.

EditText editText = (EditText) findViewById(R.id.editext1);
String result = editText.getText().toString();

How to get a specific given in Firebase

2 Answers2

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