signup.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mail=email.getText().toString();
                pass=password.getText().toString();
                number = phone.getText().toString();

                cancel = false;
                email.setError(null);
                password.setError(null);
                phone.setError(null);
                focusView=null;

                if (mail.isEmpty() || mail==null) {
                    email.setError("This field is required.");
                    focusView = email;
                    cancel = true;
                } else if (pass.isEmpty() || pass==null || pass.length()<6) {
                    password.setError("This field is required. Make sure the password length is above 6 characters.");
                    focusView = password;
                    cancel = true;
                } else if (number.isEmpty()|| number==null) {
                    phone.setError("This field is required.");
                    focusView = phone;
                    cancel = true;
                }

                if (cancel) {
                    focusView.requestFocus();
                }
                 else{

                        Compare();
                    }
                if(phoneused) {
                    phone.setError("This phone is already registered to another account, please use your actual phone number.");
                    focusView = phone;
                    focusView.requestFocus();
                    phoneused = false;

                } else if (mailused) {
                    email.setError("This mail is already registered to another account, please use another mail.");
                    focusView = email;
                    focusView.requestFocus();
                    mailused = false;

                } else  if (!mailused && !phoneused && !cancel){

                    Log.i("********", list.size()+"");
                    final ProgressDialog progressDialog = ProgressDialog.show(SignUpActivity.this, "Please wait...", "Proccessing...", true);
                    mAuth.createUserWithEmailAndPassword(mail, pass)
                            .addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                                @Override
                                public void onComplete(@NonNull Task<AuthResult> task) {
                                    progressDialog.dismiss();

                                    if (task.isSuccessful()) {
                                        Toast.makeText(SignUpActivity.this, "Registration successful", Toast.LENGTH_LONG).show();
                                        mAuth.signInWithEmailAndPassword(mail, pass);
                                        FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
                                        if (user != null) {
                                            uid = user.getUid();
                                            mDatabase = mRef.child(uid);
                                        }
                                        mDatabase.child("Email").setValue(mail);
                                        mDatabase.child("Phone").setValue(number);
                                        Intent intent = new Intent(getApplicationContext(), MainActivity.class);
                                        //Bundle extras=new Bundle();
                                        //extras.putString("Email", mail);
                                        //extras.putString("Phone", number);
                                        //intent.putExtras(extras);
                                        startActivity(intent);
                                        finish();
                                    }
                                }
                            });
                }
            }
        });
    }