Make register part

app/src/main/java/com/example/vehicleparkingsystem/Register.java

+package com.example.vehicleparkingsystem;
+
+import androidx.annotation.NonNull;
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import com.example.vehicleparkingsystem.Models.Users;
+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.database.DatabaseReference;
+import com.google.firebase.database.FirebaseDatabase;
+
+public class Register extends AppCompatActivity {
+
+    EditText editText1;
+    EditText editText2;
+    EditText editText3;
+    EditText editText4;
+    EditText editText5;
+    EditText editText6;
+
+    Button reg;
+    TextView textView;
+    FirebaseDatabase rootNode;
+    DatabaseReference reference;
+    FirebaseAuth firebaseAuth;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_register);
+
+        editText1=(EditText)findViewById(R.id.Uname);
+        editText2=(EditText)findViewById(R.id.Remail);
+        editText3=(EditText)findViewById(R.id.Age);
+        editText4=(EditText)findViewById(R.id.contct);
+        editText5=(EditText)findViewById(R.id.password);
+        editText6=(EditText)findViewById(R.id.vehicle);
+
+        reg=(Button)findViewById(R.id.register);
+        textView=(TextView)findViewById(R.id.gotologin);
+
+        textView.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                Intent intent = new Intent(Register.this, MainActivity.class);
+                startActivity(intent);
+            }
+        });
+
+        firebaseAuth=FirebaseAuth.getInstance();
+
+        reg.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                reference = FirebaseDatabase.getInstance().getReference("User");
+//                reference = rootNode.getReference("Users");
+
+                final String namee = editText1.getText().toString();
+                final String emaill = editText2.getText().toString();
+                final String age = editText3.getText().toString();
+                final String phonee = editText4.getText().toString();
+                final String pass = editText5.getText().toString();
+                final String vehicle = editText6.getText().toString();
+
+
+                if (!validateUserName() | !validateEmail() | !validateAge() | !validatePhone() | !validatePassword()) {
+                    Toast.makeText(Register.this, "Sign up failed", Toast.LENGTH_SHORT).show();
+                }
+                else{
+
+                    firebaseAuth.createUserWithEmailAndPassword(emaill, pass)
+                            .addOnCompleteListener(Register.this, new OnCompleteListener<AuthResult>() {
+                                @Override
+                                public void onComplete(@NonNull Task<AuthResult> task) {
+                                    if (task.isSuccessful()) {
+                                        FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
+                                        String userid = user.getUid();
+
+                                        Users members = new Users(namee,emaill,age,phonee,vehicle,pass);
+                                        reference.child(userid).setValue(members);
+
+                                        System.out.println(members);
+                                        Toast.makeText(Register.this, "Sign up successfully", Toast.LENGTH_SHORT).show();
+                                        Intent intent = new Intent(Register.this, Dashboard.class);
+                                        startActivity(intent);
+                                    } else {
+                                        Toast.makeText(Register.this, "Sign up failed", Toast.LENGTH_SHORT).show();
+
+                                    }
+
+                                }
+                            });
+
+                }
+            }
+        });
+    }
+
+    public boolean validateUserName() {
+        String value = editText1.getText().toString();
+        String noWhiteSpace = "\\A\\w{4,20}\\z";
+
+        if (value.isEmpty()) {
+            editText1.setError("Field cannot be empty");
+            return false;
+        } else if (value.length() >= 15) {
+            editText1.setError("Username too long. limit to 15 characters");
+            return false;
+        } else if (!value.matches(noWhiteSpace)) {
+            editText1.setError("White Spaces are not allowed");
+            return false;
+        } else {
+            editText1.setError(null);
+            return true;
+        }
+    }
+
+    public boolean validateEmail() {
+        String value = editText2.getText().toString();
+        String emailPattern = "[a-zA-Z0-9._-]+@[a-z].+[a-z]+\\.+[a-z]+";        //Regex Expression
+
+        if (value.isEmpty()) {
+            editText2.setError("Field cannot be empty");
+            return false;
+        } else if (!value.matches(emailPattern)) {
+            editText2.setError("Invalid email address");
+            return false;
+        } else {
+            editText2.setError(null);
+            return true;
+        }
+    }
+
+    public boolean validateAge() {
+        String value = editText3.getText().toString();
+
+        if (value.isEmpty()) {
+            editText3.setError("Field cannot be empty");
+            return false;
+        } else {
+            editText3.setError(null);
+            return true;
+        }
+    }
+
+    public boolean validatePhone() {
+        String value = editText4.getText().toString();
+
+        if (value.isEmpty()) {
+            editText4.setError("Field cannot be empty");
+            return false;
+        } else {
+            editText4.setError(null);
+            return true;
+        }
+    }
+
+
+    public boolean validatePassword() {
+        String value = editText5.getText().toString();
+        String password = "^" +
+                //"(?=.*[0-9])"     +           //at least 1 digit
+                //"(?=.*[a-z])"     +           //at least 1 lower case letter
+                //"(?=.*[A-Z])"    +            //at least 1 upper case letter
+                "(?=.*[a-zA-Z])" +              //any letter
+                "(?=.*[@#$%^&+=])" +            //at least 1 special character
+                "(?=\\S+$)" +                   //no white spaces
+                ".{2,}" +                      //at least 2 characters
+                "$";
+
+        if (value.isEmpty()) {
+            editText5.setError("Field cannot be empty");
+            return false;
+        } else if (!value.matches(password)) {
+            editText5.setError("Password must have at least 1 special character, 2 numbers and letters");
+            return false;
+        } else {
+            editText5.setError(null);
+            return true;
+        }
+    }
+}
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