This is a follow-up question for Android APP User class implementation. I am attempting to build a user registering system and this post shows the user registration page implementation.
The experimental implementation
Project name: UserRegistrationAPP
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android:layout_height="wrap_content" android:orientation="vertical" app:layout_constraintGuide_end="40dp" /> <androidx.constraintlayout.widget.Guideline android:id="@+id/guideline_left" android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical" app:layout_constraintGuide_begin="40dp" /> <androidx.constraintlayout.widget.Guideline android:id="@+id/guideline_right" android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical" app:layout_constraintGuide_end="40dp" /> <ImageView android:id="@+id/img_bgName" android:layout_width="0dp" android:layout_height="0dp" app:layout_constraintBottom_toBottomOf="@+id/editText_name" app:layout_constraintEnd_toStartOf="@+id/guideline_right" app:layout_constraintHorizontal_bias="0.0" app:layout_constraintStart_toStartOf="@+id/guideline_left" app:layout_constraintTop_toTopOf="@+id/editText_name" app:layout_constraintVertical_bias="1.0" app:layout_constraintVertical_chainStyle="packed" /> <ImageView android:id="@+id/img_bgID" android:layout_width="0dp" android:layout_height="0dp" app:layout_constraintBottom_toBottomOf="@+id/editTextID" app:layout_constraintEnd_toStartOf="@+id/guideline_right" app:layout_constraintHorizontal_bias="0.0" app:layout_constraintStart_toStartOf="@+id/guideline_left" app:layout_constraintTop_toTopOf="@+id/editTextID" app:layout_constraintVertical_chainStyle="packed" /> <ImageView android:id="@+id/img_bgPass" android:layout_width="0dp" android:layout_height="0dp" app:layout_constraintBottom_toBottomOf="@+id/editTextID" app:layout_constraintStart_toStartOf="@+id/guideline_left" app:layout_constraintTop_toTopOf="@+id/editTextID" app:layout_constraintVertical_bias="1.0" /> <ImageView android:id="@+id/img_bgPass7" android:layout_width="0dp" android:layout_height="0dp" app:layout_constraintBottom_toBottomOf="@+id/editTextBirthday" app:layout_constraintEnd_toStartOf="@+id/guideline_right2" app:layout_constraintStart_toStartOf="@+id/guideline_left" app:layout_constraintTop_toTopOf="@+id/editTextBirthday" /> <ImageView android:id="@+id/img_bgPass8" android:layout_width="0dp" android:layout_height="0dp" app:layout_constraintBottom_toBottomOf="@+id/editTextCellphone" app:layout_constraintEnd_toStartOf="@+id/guideline_right2" app:layout_constraintStart_toStartOf="@+id/guideline_left" app:layout_constraintTop_toTopOf="@+id/editTextCellphone" /> <ImageView android:id="@+id/img_bgPass9" android:layout_width="0dp" android:layout_height="0dp" app:layout_constraintBottom_toBottomOf="@+id/editTextEmail" app:layout_constraintEnd_toStartOf="@+id/guideline_right2" app:layout_constraintStart_toStartOf="@+id/guideline_left" app:layout_constraintTop_toTopOf="@+id/editTextEmail" /> <ImageView android:id="@+id/img_bgPass10" android:layout_width="0dp" android:layout_height="0dp" app:layout_constraintBottom_toBottomOf="@+id/editTextPassword" app:layout_constraintEnd_toStartOf="@+id/guideline_right2" app:layout_constraintStart_toStartOf="@+id/guideline_left" app:layout_constraintTop_toTopOf="@+id/editTextPassword" /> <ImageView android:id="@+id/img_bgPass11" android:layout_width="0dp" android:layout_height="0dp" app:layout_constraintBottom_toBottomOf="@+id/editTextPasswordAgain" app:layout_constraintEnd_toStartOf="@+id/guideline_right2" app:layout_constraintStart_toStartOf="@+id/guideline_left" app:layout_constraintTop_toTopOf="@+id/editTextPasswordAgain" /> <EditText android:id="@+id/editText_name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="6dp" android:layout_marginBottom="8dp" android:backgroundTint="#00FFFFFF" android:ems="18" android:inputType="textPersonName" android:text="@string/register_name" android:textSize="12sp" app:layout_constraintBottom_toTopOf="@+id/editTextID" app:layout_constraintStart_toEndOf="@+id/imageView12" app:layout_constraintTop_toBottomOf="@+id/textView2" app:layout_constraintVertical_chainStyle="packed" /> <EditText android:id="@+id/editTextID" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="6dp" android:layout_marginBottom="8dp" android:backgroundTint="#00FFFFFF" android:ems="18" android:inputType="textPersonName" android:text="@string/register_id" android:textSize="12sp" app:layout_constraintBottom_toTopOf="@+id/editTextBirthday" app:layout_constraintStart_toEndOf="@+id/imageView22" app:layout_constraintTop_toBottomOf="@+id/editText_name" /> <EditText android:id="@+id/editTextBirthday" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="6dp" android:layout_marginBottom="8dp" android:backgroundTint="#00FFFFFF" android:ems="18" android:inputType="textPersonName" android:text="@string/register_birthday" android:textSize="12sp" app:layout_constraintBottom_toTopOf="@+id/editTextCellphone" app:layout_constraintStart_toEndOf="@+id/imageView17" app:layout_constraintTop_toBottomOf="@+id/editTextID" /> <EditText android:id="@+id/editTextCellphone" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="6dp" android:layout_marginBottom="8dp" android:backgroundTint="#00FFFFFF" android:ems="18" android:inputType="textPersonName" android:text="@string/register_cellPhone" android:textSize="12sp" app:layout_constraintBottom_toTopOf="@+id/editTextEmail" app:layout_constraintStart_toEndOf="@+id/imageView19" app:layout_constraintTop_toBottomOf="@+id/editTextBirthday" /> <EditText android:id="@+id/editTextEmail" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="6dp" android:layout_marginBottom="8dp" android:backgroundTint="#00FFFFFF" android:ems="18" android:inputType="textPersonName" android:text="@string/register_email" android:textSize="12sp" app:layout_constraintBottom_toTopOf="@+id/editTextPassword" app:layout_constraintStart_toEndOf="@+id/imageView21" app:layout_constraintTop_toBottomOf="@+id/editTextCellphone" /> <EditText android:id="@+id/editTextPassword" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="6dp" android:layout_marginBottom="8dp" android:backgroundTint="#00FFFFFF" android:ems="18" android:inputType="textPersonName" android:text="@string/register_password" android:textSize="12sp" app:layout_constraintBottom_toTopOf="@+id/editTextPasswordAgain" app:layout_constraintStart_toEndOf="@+id/imageView20" app:layout_constraintTop_toBottomOf="@+id/editTextEmail" /> <EditText android:id="@+id/editTextPasswordAgain" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="6dp" android:layout_marginBottom="12dp" android:backgroundTint="#00FFFFFF" android:ems="18" android:inputType="textPersonName" android:text="@string/register_PasswordAgain" android:textSize="12sp" app:layout_constraintBottom_toTopOf="@+id/btn_apply" app:layout_constraintStart_toEndOf="@+id/imageView18" app:layout_constraintTop_toBottomOf="@+id/editTextPassword" /> <Button android:id="@+id/btn_apply" android:layout_width="0dp" android:layout_height="wrap_content" android:text="Apply" android:textColor="#FFFFFF" android:textSize="18sp" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toStartOf="@+id/guideline_right" app:layout_constraintHorizontal_bias="0.5" app:layout_constraintStart_toStartOf="@+id/guideline_left" app:layout_constraintTop_toBottomOf="@+id/editTextPasswordAgain" /> <TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="64dp" android:layout_marginBottom="16dp" android:text="@string/registration_form_title" android:textColor="#bf1f2a" android:textSize="24sp" app:layout_constraintBottom_toTopOf="" app:layout_constraintEnd_toStartOf="@+id/guideline_right" app:layout_constraintHorizontal_bias="0.5" app:layout_constraintStart_toStartOf="@+id/guideline_left" app:layout_constraintTop_toTopOf="parent" app:layout_constraintVertical_bias="0.4" app:layout_constraintVertical_chainStyle="packed" /> <ImageView android:id="@+id/imageView12" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="8dp" app:layout_constraintBottom_toBottomOf="@+id/img_bgName" app:layout_constraintStart_toStartOf="@+id/img_bgName" app:layout_constraintTop_toTopOf="@+id/img_bgName" app:srcCompat="@drawable/name" /> <ImageView android:id="@+id/imageView22" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="8dp" app:layout_constraintBottom_toBottomOf="@+id/img_bgID" app:layout_constraintStart_toStartOf="@+id/img_bgID" app:layout_constraintTop_toTopOf="@+id/img_bgID" app:srcCompat="@drawable/id" /> <ImageView android:id="@+id/imageView17" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="8dp" app:layout_constraintBottom_toBottomOf="@+id/img_bgPass7" app:layout_constraintStart_toStartOf="@+id/guideline_left" app:layout_constraintTop_toTopOf="@+id/img_bgPass7" app:srcCompat="@drawable/birthday" /> <ImageView android:id="@+id/imageView18" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="8dp" app:layout_constraintBottom_toBottomOf="@+id/img_bgPass11" app:layout_constraintStart_toStartOf="@+id/img_bgPass11" app:layout_constraintTop_toTopOf="@+id/img_bgPass11" app:srcCompat="@drawable/password" /> <ImageView android:id="@+id/imageView21" android:layout_width="24dp" android:layout_height="24dp" android:layout_marginStart="8dp" app:layout_constraintBottom_toBottomOf="@+id/img_bgPass9" app:layout_constraintStart_toStartOf="@+id/img_bgPass9" app:layout_constraintTop_toTopOf="@+id/img_bgPass9" app:srcCompat="@drawable/email" /> <ImageView android:id="@+id/imageView20" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="8dp" app:layout_constraintBottom_toBottomOf="@+id/img_bgPass10" app:layout_constraintStart_toStartOf="@+id/img_bgPass10" app:layout_constraintTop_toTopOf="@+id/img_bgPass10" app:srcCompat="@drawable/password" /> <ImageView android:id="@+id/imageView19" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="8dp" app:layout_constraintBottom_toBottomOf="@+id/img_bgPass8" app:layout_constraintStart_toStartOf="@+id/img_bgPass8" app:layout_constraintTop_toTopOf="@+id/img_bgPass8" app:srcCompat="@drawable/phone" /> <androidx.constraintlayout.widget.Guideline android:id="@+id/guideline" android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical" app:layout_constraintGuide_begin="15dp" /> </androidx.constraintlayout.widget.ConstraintLayout>Userclass implementation:package com.example.userregistrationapp; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.time.LocalDate; import java.time.LocalDateTime; import java.time.LocalTime; import java.time.format.DateTimeFormatter; import java.time.format.DateTimeParseException; import java.util.Locale; public class User implements java.io.Serializable{ private String fullName; private String personalID; private String dateOfBirth; private String cellPhoneNumber; private String emailInfo; private String password; private final String dateFormat = "yyyy-MM-dd"; public User(String fullNameInput, String personalIDInput, String dateOfBirthInput, String cellPhoneNumberInput, String emailInfoInput, String passwordInput) throws NoSuchAlgorithmException, NullPointerException, IllegalArgumentException // User object constructor { // Reference: https://stackoverflow.com/a/6358/6667035 if (fullNameInput == null) { throw new NullPointerException("fullNameInput must not be null"); } this.fullName = fullNameInput; if (personalIDInput == null) { throw new NullPointerException("personalIDInput must not be null"); } this.personalID = personalIDInput; if (dateOfBirthInput == null) { throw new NullPointerException("dateOfBirthInput must not be null"); } this.dateOfBirth = dateOfBirthInput; if (cellPhoneNumberInput == null) { throw new NullPointerException("cellPhoneNumberInput must not be null"); } this.cellPhoneNumber = cellPhoneNumberInput; if (emailInfoInput == null) { throw new NullPointerException("emailInfoInput must not be null"); } this.emailInfo = emailInfoInput; if (passwordInput == null) { throw new NullPointerException("passwordInput must not be null"); } this.password = hashingMethod(passwordInput); } public String getFullName() { return this.fullName; } public String getPersonalID() { return this.personalID; } public String getDateOfBirth() { return this.dateOfBirth; } public String getCellPhoneNumber() { return this.cellPhoneNumber; } public String getEmailInfo() { return this.emailInfo; } public String getHash() throws NoSuchAlgorithmException { return hashingMethod(this.fullName + this.personalID); } public String getHashedPassword() throws NoSuchAlgorithmException { return this.password; } public boolean checkPassword(String password) { boolean result = false; try { result = this.password.equals(hashingMethod(password)); } catch (Exception e) { e.printStackTrace(); } return result; } //********************************************************************************************** // Reference: https://stackoverflow.com/a/2624385/6667035 private String hashingMethod(String inputString) throws NoSuchAlgorithmException { MessageDigest messageDigest = MessageDigest.getInstance("SHA-256"); String stringToHash = inputString; messageDigest.update(stringToHash.getBytes()); String stringHash = new String(messageDigest.digest()); return stringHash; } }strings.xml:<resources> <string name="app_name">UserRegistrationAPP</string> <string name="registration_form_title">Registration Form</string> <string name="register_name">Name</string> <string name="register_id">ID</string> <string name="register_birthday">birthday</string> <string name="register_cellPhone">CellPhone</string> <string name="register_email">Email</string> <string name="register_password">Password</string> <string name="register_PasswordAgain">Type Password Again</string> <string name="register_name_null_message">Please fill in name!</string> <string name="please_fill_in_register_id">Please fill in ID!</string> <string name="please_select_birthday">Please select birthday!</string> <string name="please_fill_in_register_cellPhone">Please fill in cellphone number!</string> <string name="please_fill_in_register_cellPhone_number">Please fill in correct cellphone number!</string> <string name="please_fill_in_Email">Please fill in Email!</string> <string name="please_fill_in_correct_Email">Please fill in correct Email!</string> <string name="please_fill_in_password">Please fill in password!</string> <string name="please_fill_in_confirm_password">Please fill in password again!</string> <string name="confirmation_password_not_equal">Please check passwords are equal!</string> <string name="send">Registration information have been sent!</string> <string name="OK">OK</string> </resources>MainActivity.javaimplementation:package com.example.userregistrationapp; import androidx.appcompat.app.AppCompatActivity; import android.content.Context; import android.os.Bundle; import android.text.InputType; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; import java.security.NoSuchAlgorithmException; import java.util.Calendar; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); final EditText nameEditText = findViewById(R.id.editText_name); clickAndClear(nameEditText); final EditText personalIDEditText = findViewById(R.id.editTextID); clickAndClear(personalIDEditText); final EditText dateOfBirthInfoEditText = findViewById(R.id.editTextBirthday); View.OnClickListener dateOfBirthInfoClickHandler = v -> { if (v ==dateOfBirthInfoEditText) { Calendar calendar = Calendar.getInstance(); int year = calendar.get(Calendar.YEAR); int month = calendar.get(Calendar.MONTH); int day = calendar.get(Calendar.DAY_OF_MONTH); new android.app.DatePickerDialog(v.getContext(), (view, year1, month1, day1) -> { String dateTime = String.valueOf(year1)+"-"+String.valueOf(month1)+"-"+String.valueOf(day1); dateOfBirthInfoEditText.setText(dateTime); }, year, month, day).show(); } }; dateOfBirthInfoEditText.setOnClickListener(dateOfBirthInfoClickHandler); final EditText cellphoneNumberEditText = findViewById(R.id.editTextCellphone); clickAndClear(cellphoneNumberEditText); final EditText emailInfoEditText = findViewById(R.id.editTextEmail); clickAndClear(emailInfoEditText); final EditText passwordEditText = findViewById(R.id.editTextPassword); clickAndClear(passwordEditText, true); final EditText confirmPasswordEditText = findViewById(R.id.editTextPasswordAgain); clickAndClear(confirmPasswordEditText, true); final Button applyButton = findViewById(R.id.btn_apply); View.OnClickListener ApplyButtonClickHandler = v -> { if (v == applyButton) { // Parsing Information String nameString = getEditTextContent(nameEditText); String personalIDString = getEditTextContent(personalIDEditText); String dateOfBirtString = getEditTextContent(dateOfBirthInfoEditText); String cellphoneNumberString = getEditTextContent(cellphoneNumberEditText); String emailInfoString = getEditTextContent(emailInfoEditText); String passwordString = getEditTextContent(passwordEditText); String confirmPasswordString = getEditTextContent(confirmPasswordEditText); // Checking Information if ((nameString.isEmpty()) || (nameString.contains(getResources().getString(R.string.register_name)))) { showAlertDialog(getResources().getString(R.string.register_name_null_message), getResources().getString(R.string.OK)); return; } if ((personalIDString.isEmpty()) || (personalIDString.equals(getResources().getString(R.string.register_id)))) { showAlertDialog(getResources().getString(R.string.please_fill_in_register_id), getResources().getString(R.string.OK)); return; } if ((dateOfBirtString.isEmpty()) || (dateOfBirtString.equals(getResources().getString(R.string.register_birthday)))) { showAlertDialog(getResources().getString(R.string.please_select_birthday), getResources().getString(R.string.OK)); return; } if ((cellphoneNumberString.isEmpty()) || (cellphoneNumberString.equals(getResources().getString(R.string.register_cellPhone)))) { showAlertDialog(getResources().getString(R.string.please_fill_in_register_cellPhone), getResources().getString(R.string.OK)); return; } if (checkCellphoneNumber(cellphoneNumberEditText.getText().toString()) == false) { showAlertDialog(getResources().getString(R.string.please_fill_in_register_cellPhone_number), getResources().getString(R.string.OK)); return; } if ((emailInfoString.isEmpty()) || (emailInfoString.equals(getResources().getString(R.string.register_email)))) { showAlertDialog(getResources().getString(R.string.please_fill_in_Email), getResources().getString(R.string.OK)); return; } if (checkEmail(emailInfoString)==false) { showAlertDialog(getResources().getString(R.string.please_fill_in_correct_Email), getResources().getString(R.string.OK)); return; } if (passwordString.isEmpty() || passwordString.equals(getResources().getString(R.string.register_password))) { showAlertDialog(getResources().getString(R.string.please_fill_in_password), getResources().getString(R.string.OK)); return; } if (confirmPasswordString.isEmpty()) { showAlertDialog(getResources().getString(R.string.please_fill_in_confirm_password), getResources().getString(R.string.OK)); return; } if (passwordString.equals(confirmPasswordString) == false) { showAlertDialog(getResources().getString(R.string.confirmation_password_not_equal), getResources().getString(R.string.OK)); return; } try { sendRegisterInfo(new User( nameString, personalIDString, dateOfBirtString, cellphoneNumberString, emailInfoString, passwordString )); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } showToast(getResources().getString(R.string.send), Toast.LENGTH_SHORT); } }; applyButton.setOnClickListener(ApplyButtonClickHandler); return; } private void sendRegisterInfo(User newUser) { // TODO: perform send operation! return; } private boolean checkEmail(String input) { return input.contains("@"); } private boolean checkCellphoneNumber(String input) { return isNumeric(input); } private boolean isNumeric(String s) { return s != null && s.matches("[-+]?\\d*\\.?\\d+"); } private String getEditTextContent(final EditText editTextInput) { return editTextInput.getText().toString(); } private void showToast(String textInput, int duration) { Context context = getApplicationContext(); CharSequence text = textInput; Toast toast = Toast.makeText(context, text, duration); toast.show(); } private void showAlertDialog(String titleString, String stringOnPositiveButton) { androidx.appcompat.app.AlertDialog.Builder builder = new androidx.appcompat.app.AlertDialog.Builder(this); builder.setMessage(titleString) .setPositiveButton(stringOnPositiveButton, (dialog, id) -> { }); builder.show(); } // clickAndClear method // Clear EditText content after clicking it. private void clickAndClear(final EditText editTextInput) { View.OnClickListener editTextViewClickHandler = v -> { if (v == editTextInput) { editTextInput.setText(""); } }; editTextInput.setOnClickListener(editTextViewClickHandler); } // clickAndClear method // Clear EditText content after clicking it. // If isPassword==true, hide characters like `***` with `.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);` syntax. private void clickAndClear(final EditText editTextInput, final boolean isPassword) { View.OnClickListener editTextViewClickHandler = v -> { if (v == editTextInput) { editTextInput.setText(""); if (isPassword ==true) { editTextInput.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD); } } }; editTextInput.setOnClickListener(editTextViewClickHandler); } }
All suggestions are welcome.
The summary information:
Which question it is a follow-up to?
What changes has been made in the code since last question?
Besides creating
Userclass, the full registration page implementation is shown in this post.Why a new review is being asked for?
If there is any possible improvement, please let me know.
