Java – Firebase query logic does not work in Android

Firebase query logic does not work in Android… here is a solution to the problem.

Firebase query logic does not work in Android

I want to make a query to check if a certain name (president or secretary) exists in the database.
The database structure is as follows.

Firebase database

I have this code but it doesn’t work. Am I doing something wrong?

mDatabase = FirebaseDatabase.getInstance().getReference();
        Query presidentquery = mDatabase.child("validate").child(uid).equalTo("President");
        presidentquery.addListenerForSingleValueEvent(new ValueEventListener() {
            public void onDataChange(DataSnapshot dataSnapshot) {
                if (dataSnapshot.exists()) {
                    for (DataSnapshot dataSnapshot1 : dataSnapshot.getChildren()) {
                        Candidate p = dataSnapshot1.getValue(Candidate.class);
                        president.setText("Voted Already");

president.setOnClickListener(new View.OnClickListener() {
                        public void onClick(View v) {

startActivity(new Intent(Home.this, AllCandidates.class));
            public void onCancelled(DatabaseError databaseError) {


You seem to know the exact node to load, in which case you don’t need equalTo. Instead, you can find the node in the following way:

Query presidentquery = mDatabase.child("validate").child(uid).child("President");

The rest of your code can remain unchanged.

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