SignUp.java

package com.example.fda;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import android.util.Patterns;

import com.google.android.material.textfield.TextInputEditText;

public class SignUp extends AppCompatActivity {
    TextInputEditText textInputEditTextFullname,
            textInputEditTextUsername,
            textInputEditTextPassword,
            textInputEditTextEmail;
    Button buttonSignUp;
    TextView textViewLogin;
    ProgressBar progressBar;

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

        textInputEditTextFullname = findViewById(R.id.fullname);
        textInputEditTextUsername = findViewById(R.id.username);
        textInputEditTextPassword = findViewById(R.id.password);
        textInputEditTextEmail = findViewById(R.id.email);
        buttonSignUp = findViewById(R.id.buttonSignUp);
        textViewLogin = findViewById(R.id.loginText);
        progressBar = findViewById(R.id.progress);

        textViewLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(getApplicationContext(), Login.class);
                startActivity(intent);
                finish();
            }
        });

        buttonSignUp.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                String fullname, username, password, email;
                fullname = String.valueOf(textInputEditTextFullname.getText());
                username = String.valueOf(textInputEditTextUsername.getText());
                password = String.valueOf(textInputEditTextPassword.getText());
                email = String.valueOf(textInputEditTextEmail.getText());

                if (!fullname.equals("") && !username.equals("") &&
                        !password.equals("") && !email.equals("")) {
                    //Start ProgressBar first (Set visibility VISIBLE)
                    progressBar.setVisibility(View.VISIBLE);
                    Handler handler = new Handler(Looper.getMainLooper());
                    handler.post(new Runnable() {
                        @Override
                        public void run() {
                            String[] field = new String[4];
                            field[0] = "fullname";
                            field[1] = "username";
                            field[2] = "password";
                            field[3] = "email";

                            //Creating array for data
                            String[] data = new String[4];
                            data[0] = fullname;
                            data[1] = username;
                            data[2] = password;
                            data[3] = email;
                            if (!email.isEmpty() && Patterns.EMAIL_ADDRESS.matcher(email).matches()) {
                                PutData putData = new PutData("http://192.168.0.109:80/LoginRegister/signup.php", "POST", field, data);
                                if (putData.startPut()) {
                                    if (putData.onComplete()) {
                                        progressBar.setVisibility(View.GONE);
                                        String result = putData.getResult();
                                        if (result.equals("Sign Up Success")) {
                                            Toast.makeText(getApplicationContext(), result, Toast.LENGTH_SHORT).show();
                                            Intent intent = new Intent(getApplicationContext(), Login.class);
                                            startActivity(intent);
                                            finish();
                                        } else {
                                            Toast.makeText(getApplicationContext(), result, Toast.LENGTH_SHORT).show();
                                        }
                                    }
                                }
                            } else {
                                progressBar.setVisibility(View.GONE);
                                Toast.makeText(getApplicationContext(), "Enter valid Email address !", Toast.LENGTH_SHORT).show();
                            }
                        }
                    });
                }
                else{
                    Toast.makeText(getApplicationContext(),"All Fields are required",Toast.LENGTH_SHORT).show();
                }
            }
        });
    }
}