RegisterActivity.java

package com.android.project.futsalkuy;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.google.firebase.auth.FirebaseAuth;

public class SignUpActivity extends AppCompatActivity {
    EditText edtPhonenumber, edtEmail, edtPassword, editText;
    //membuat variable Button
    Button buttonRegister;
    //    membuat variable LoginDataHelper
    LoginDataHelper dataHelper;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_sign_up);

        editText = findViewById(R.id.editPhonenumber);
        findViewById(R.id.btn_register_SignUpScreen).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String number = editText.getText().toString();

                if (number.isEmpty() || number.equals(" ")) {
                    editText.setError("Number cannot be empty");
                    editText.requestFocus();
                    return;
                } else if (!(number.contains("+62"))) {
                    editText.setError("Number must use +62");
                    editText.requestFocus();
                    return;
                } else if (number.length() < 13) {
                    editText.setError("Number must exceed 14 digits");
                    editText.requestFocus();
                    return;
                }
                Intent verifyScreen = new Intent(SignUpActivity.this, VerifyActivity.class);
                verifyScreen.putExtra("phonenumber", number);
                startActivity(verifyScreen);
            }
        });


//        mengambil komponen view yang ada pada res/layout
        edtPhonenumber = findViewById(R.id.editPhonenumber);
        edtEmail = findViewById(R.id.editEmail);
        edtPassword = findViewById(R.id.editPassword);
        buttonRegister = findViewById(R.id.btn_register_SignUpScreen);
//        melakukan instansiasi object
        dataHelper = new LoginDataHelper(this);


// memberikan perintah onclicklistener pada button register
        buttonRegister.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

//                mengambil inputan yang telah diinputkan
                String phonenumber = edtPhonenumber.getText().toString();
                String email = edtEmail.getText().toString();
                String password = edtPassword.getText().toString();

// validasi jika tidak kosong dan bukan space
                if(phonenumber.equals("") || phonenumber.trim().isEmpty() || email.equals("") || email.trim().isEmpty() || password.equals("") || password.trim().isEmpty() ) {
                    Toast.makeText(SignUpActivity.this,"Username Password harus diisi",Toast.LENGTH_LONG).show();
                }else
                {
// memanggil database dengan permition write
                    SQLiteDatabase db = dataHelper.getWritableDatabase();
//                    memanggil fungsi addUser pada dataHelper yang telah kita buat
                    dataHelper.addUser(phonenumber,email,password);
// menampilkan Toas Register berhasil
                    Toast.makeText(SignUpActivity.this,"Register berhasil",Toast.LENGTH_LONG).show();
                    Intent mIntent = new Intent(SignUpActivity.this, DashboardActivity .class);
                    mIntent.putExtra("phone",phonenumber);
                    mIntent.putExtra("password", password);
                    startActivity(mIntent);
// menutup activity
                    finish();
                }
            }
        });
    }

    @Override
    protected void onStart() {
        super.onStart();
        if (FirebaseAuth.getInstance().getCurrentUser() != null) {
            Toast.makeText(getApplicationContext(), "Akun anda terverivikasi", Toast.LENGTH_LONG).show();
            Intent signUpScreen = new Intent(this, DashboardActivity.class);
            startActivity(signUpScreen);
        }
    }
}