Android User Authentication with Login and Registration
Tech
1
AuthenticationActivity
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class AuthenticationActivity extends AppCompatActivity {
private final ExecutorService networkExecutor = Executors.newSingleThreadExecutor();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_authentication);
findViewById(R.id.btn_go_to_enroll).setOnClickListener(v ->
startActivity(new Intent(AuthenticationActivity.this, EnrollmentActivity.class))
);
}
public void processLogin(View view) {
EditText usernameField = findViewById(R.id.et_username);
EditText passkeyField = findViewById(R.id.et_passkey);
String account = usernameField.getText().toString();
String secret = passkeyField.getText().toString();
// Admin bypass logic
if ("admin".equals(account) && "admin".equals(secret)) {
startActivity(new Intent(this, AdminDashboard.class));
return;
}
networkExecutor.execute(() -> {
UserRepository repo = new UserRepository();
int authResult = repo.authenticateUser(account, secret);
runOnUiThread(() -> {
switch (authResult) {
case 1:
showToast("Access granted.");
startActivity(new Intent(AuthenticationActivity.this, UserDashboard.class));
break;
case 0:
showToast("Authentication failed.");
break;
case 2:
showToast("Incorrect passkey.");
break;
case 3:
showToast("User ID not found.");
break;
}
});
});
}
private void showToast(String message) {
Toast.makeText(this, message, Toast.LENGTH_SHORT).show();
}
}
EnrollmentActivity
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class EnrollmentActivity extends AppCompatActivity {
private EditText userIdInput;
private EditText fullNameInput;
private EditText contactInput;
private EditText groupInput;
private EditText secretInput;
private final ExecutorService networkExecutor = Executors.newSingleThreadExecutor();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_enrollment);
userIdInput = findViewById(R.id.et_user_id);
fullNameInput = findViewById(R.id.et_full_name);
contactInput = findViewById(R.id.et_contact_number);
groupInput = findViewById(R.id.et_group_name);
secretInput = findViewById(R.id.et_passkey);
findViewById(R.id.btn_return_to_login).setOnClickListener(v -> {
startActivity(new Intent(EnrollmentActivity.this, AuthenticationActivity.class));
finish();
});
}
public void processEnrollment(View view) {
String uid = userIdInput.getText().toString();
String name = fullNameInput.getText().toString();
String phone = contactInput.getText().toString();
String grp = groupInput.getText().toString();
String pwd = secretInput.getText().toString();
AppUser candidate = new AppUser(uid, name, phone, grp, pwd);
networkExecutor.execute(() -> {
UserRepository repo = new UserRepository();
AppUser existing = repo.fetchUserById(candidate.getUserId());
if (existing != null) {
runOnUiThread(() -> showToast("This user ID is already registered."));
} else {
boolean isSuccess = repo.insertUser(candidate);
runOnUiThread(() -> {
if (isSuccess) {
showToast("Enrollment completed successfully.");
Intent resultIntent = new Intent();
resultIntent.putExtra("enrollment_status", "completed");
setResult(RESULT_OK, resultIntent);
finish();
} else {
showToast("Failed to complete enrollment.");
}
});
}
});
}
private void showToast(String message) {
Toast.makeText(this, message, Toast.LENGTH_SHORT).show();
}
}
activity_authentication.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#F0F0F0">
<ImageView
android:id="@+id/iv_app_logo"
android:layout_width="match_parent"
android:layout_height="120dp"
android:layout_marginTop="100dp"
android:src="@drawable/gb1"/>
<TextView
android:id="@+id/tv_form_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="25dp"
android:text="User Authentication"
android:gravity="center"
android:textStyle="italic"
android:textColor="#757575"
android:textSize="28sp" />
<EditText
android:id="@+id/et_username"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="14dp"
android:layout_marginHorizontal="20dp"
android:layout_marginVertical="8dp"
android:background="@drawable/translucent_edit"
android:hint="Username"
android:textSize="22sp"
android:singleLine="true" />
<EditText
android:id="@+id/et_passkey"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="14dp"
android:layout_marginHorizontal="20dp"
android:layout_marginVertical="8dp"
android:background="@drawable/translucent_edit"
android:hint="Password"
android:textSize="22sp"
android:maxLength="16"
android:singleLine="true"
android:inputType="textPassword" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginTop="16dp">
<Button
android:id="@+id/btn_login"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="14dp"
android:layout_margin="14dp"
android:layout_weight="1"
android:textColor="@color/cardview_light_background"
android:background="@drawable/translucent_button"
android:text="Login"
android:textSize="22sp"
android:onClick="processLogin"/>
<Button
android:id="@+id/btn_go_to_enroll"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="14dp"
android:layout_margin="14dp"
android:layout_weight="1"
android:textColor="@color/cardview_light_background"
android:background="@drawable/translucent_button"
android:text="Register"
android:textSize="22sp" />
</LinearLayout>
</LinearLayout>
activity_enrollment.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#F0F0F0"
android:padding="16dp">
<ImageView
android:id="@+id/iv_brand_logo"
android:layout_width="match_parent"
android:layout_height="120dp"
android:layout_marginTop="2dp"
android:src="@drawable/gb1"/>
<TextView
android:id="@+id/tv_screen_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginVertical="8dp"
android:text="User Enrollment"
android:gravity="center"
android:textStyle="italic"
android:textColor="#757575"
android:textSize="28sp" />
<EditText
android:id="@+id/et_user_id"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="12dp"
android:layout_marginVertical="6dp"
android:background="@drawable/translucent_edit"
android:hint="User ID"
android:textSize="22sp"
android:singleLine="true" />
<EditText
android:id="@+id/et_full_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="12dp"
android:layout_marginVertical="6dp"
android:background="@drawable/translucent_edit"
android:hint="Full Name"
android:textSize="22sp"
android:singleLine="true" />
<EditText
android:id="@+id/et_contact_number"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="12dp"
android:layout_marginVertical="6dp"
android:background="@drawable/translucent_edit"
android:hint="Contact Number"
android:textSize="22sp"
android:singleLine="true" />
<EditText
android:id="@+id/et_group_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="12dp"
android:layout_marginVertical="6dp"
android:background="@drawable/translucent_edit"
android:hint="Group/Class"
android:textSize="22sp"
android:singleLine="true" />
<EditText
android:id="@+id/et_passkey"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="12dp"
android:layout_marginVertical="6dp"
android:background="@drawable/translucent_edit"
android:hint="Password"
android:textSize="22sp"
android:maxLength="16"
android:singleLine="true"
android:inputType="textPassword" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginTop="16dp">
<Button
android:id="@+id/btn_submit_enrollment"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:padding="14dp"
android:layout_marginEnd="8dp"
android:background="@drawable/translucent_button"
android:text="Enroll"
android:textColor="@color/dark"
android:textSize="22sp"
android:onClick="processEnrollment"/>
<Button
android:id="@+id/btn_return_to_login"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:padding="14dp"
android:layout_marginStart="8dp"
android:textColor="@color/dark"
android:background="@drawable/translucent_button"
android:text="Back to Login"
android:textSize="22sp" />
</LinearLayout>
</LinearLayout>
