cant seem to make the empty fields work

package com.example.tommy.ttuf;

import android.app.ProgressDialog;
import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.auth.UserProfileChangeRequest;

public class SignUpActivity extends AppCompatActivity implements View.OnClickListener{
    private FirebaseAuth mAuth;
    private Button btnSignup;
    private EditText etUsername,etEmail,etPassword;
    private TextView tvSignin;

    private ProgressDialog progressDialog;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sign_up);


        mAuth = FirebaseAuth.getInstance();

        btnSignup=(Button)findViewById(R.id.btnSignup);
        etEmail=(EditText)findViewById(R.id.etEmail);
        etPassword=(EditText)findViewById(R.id.etPassword);
        etUsername=(EditText)findViewById(R.id.etUsername);
        tvSignin=(TextView) findViewById(R.id.tvSignin);

        progressDialog=new ProgressDialog(this);



        //if the user is logged in

        if (mAuth.getCurrentUser()!=null){
            //if the user is not logged in
            finish();
            startActivity(new Intent(getApplicationContext(),SignInActivity.class));

        }





        btnSignup.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                String getemail=etEmail.getText().toString().trim();
                String getpassword=etPassword.getText().toString().trim();
                String getusername=etUsername.getText().toString().trim();


                callsignup(getemail,getpassword,getusername);

                progressDialog.setMessage("Registering User...");
                progressDialog.show();


            }

        });


    }

    //this part of the code is to create new users

    private void callsignup (String email,String password,String username){
        if (TextUtils.isEmpty(email)){
            Toast.makeText(this,"Please enter email",Toast.LENGTH_SHORT).show();
            return;
        }

        if (TextUtils.isEmpty(password)){
            Toast.makeText(this,"Please enter password",Toast.LENGTH_SHORT).show();
            return;
        }

        if (TextUtils.isEmpty(username)){
            Toast.makeText(this,"Please enter username",Toast.LENGTH_SHORT).show();
            return;
        }

        mAuth.createUserWithEmailAndPassword(email, password )
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {

                            // Sign in success, update UI with the signed-in user's information
                            Log.d("Testing", "Signup Succesful"+task.isSuccessful());

                        if (!task.isSuccessful()) {
                            Toast.makeText(SignUpActivity.this, "Signup failed", Toast.LENGTH_SHORT).show();
                            progressDialog.dismiss();
                        }
                        else {
                            userProfile();
                            Toast.makeText(SignUpActivity.this, "Account created ", Toast.LENGTH_SHORT).show();
                            Log.d("Testing","Account Created");
                            progressDialog.dismiss();

                        }

                    }

                });

    }


    //set user display name
    private void userProfile(){
        FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
        if (user != null){
            UserProfileChangeRequest profileUpdates=new UserProfileChangeRequest.Builder()
                    .setDisplayName(etUsername.getText().toString().trim()).build();



            user.updateProfile(profileUpdates)
                    .addOnCompleteListener(new OnCompleteListener<Void>(){

                        @Override
                        public void onComplete(@NonNull Task<Void> task) {
                            if(task.isSuccessful()){
                                Log.d("Testing","User profile updated");
                            }

                        }

                    });

        }

    }




    @Override
    public void onClick(View view) {
        if (view==tvSignin){
            finish();
            startActivity(new Intent(this,SignInActivity.class));
        }
    }
    }