How to check if username exists in EditText(Text Changed Listener) by using Firebase.?

Question

I tried many ways.But nothing works.can you help me please.my Firebase Structure is I want to check username exists or not from searching in Usernames

It works By clicking Submit button.But,I want to implements it's on EditText with automatic searching on text changed.How can i do it.? Advanced thanks

        usrnm.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, 
    int after) {

        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
        mRef.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                if (dataSnapshot.getValue().equals(usrname)){
                   usrnm.setError("Username Unavailable");
                }
            }

            @Override
            public void onCancelled(DatabaseError databaseError) {

            }
        });
        }

        @Override
        public void afterTextChanged(Editable s) {

        }
    });

No.i did n't get anything.i tried it with toast.that works... — Suhail, Aug 15 '17 at 19:21
I did n't get any value.But.,I checked it with toast.it works.. — Suhail, Aug 15 '17 at 19:23
No.i checked editText only...i checked is it working or not. — Suhail, Aug 15 '17 at 19:35

score 0 · Answer 1 · answered Aug 15 '17 at 18:48

0

yes you can use textwatcher and inside three method before after onchange text and your firebase datasnapshot to get data and compare with edittext value any query comment here.

answered Aug 15 '17 at 18:48

Vishal kumar singhvi

936
8
17

Please Check my edited question now.Is there any problem? – Suhail Aug 15 '17 at 19:03

score 0 · Answer 2 · answered Aug 15 '17 at 18:53

use TextChangeListner in EditText.
for Eg...

EditText username = (EditText)findViewById(R.id.eg);
username.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

        }

        @Override
        public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
            //here when user enter our username in EditText (While entering)
        }

        @Override
        public void afterTextChanged(Editable editable) {
        }
    });

Please Check my edited question now.Is there any problem? – Suhail Aug 15 '17 at 19:04 — Suhail, Aug 15 '17 at 19:04

score 0 · Answer 3 · answered Aug 15 '17 at 19:21

you may get some error because I wrote this from my memory but u should do it like this.

       ArrayList<String> allUserName = new ArrayList();
       mRef.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
             allUserName =(ArrayList<String>) 
              dataSnapshot.getValue(String.class);
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });


    EditText username = (EditText)findViewById(R.id.et);
    username.addTextChangedListener(new TextWatcher() {
    @Override
    public void beforeTextChanged(CharSequence charSequence, int i, int i1, 
     int i2) {

    }

    @Override
    public void onTextChanged(CharSequence charSequence, int i, int i1, int 
 i2) {
        if (allUserName.contains(usrname)){
               usrnm.setError("Username Unavailable");
            }
    }

    @Override
    public void afterTextChanged(Editable editable) {
    }
});

How to check if username exists in EditText(Text Changed Listener) by using Firebase.?

3 Answers3