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Database and Fragments 101 for Android Dev

#android #xml #java

//activity_ticket_printing.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:padding="16dp"> <TextView android:id="@+id/ticket_details" android:layout_width="match_parent" android:layout_height="wrap_content" android:textSize="18sp" /> <Button android:id="@+id/back_button" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Back" /> </LinearLayout>
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//TicketPrintingActivity.java

public class TicketPrintingActivity extends AppCompatActivity { private TextView ticketDetailsTextView; private Button backButton; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_ticket_printing); ticketDetailsTextView = findViewById(R.id.ticket_details); backButton = findViewById(R.id.back_button); // Retrieve ticket details from intent Intent intent = getIntent(); String name = intent.getStringExtra("name"); String age = intent.getStringExtra("age"); String date = intent.getStringExtra("date"); String time = intent.getStringExtra("time"); String seatType = intent.getStringExtra("seatType"); // Display ticket details String ticketDetails = "Name: " + name + "\nAge: " + age + "\nDate: " + date + "\nTime: " + time + "\nSeat Type: " + seatType; ticketDetailsTextView.setText(ticketDetails); backButton.setOnClickListener(v -> finish()); } }
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//fragment_past_bookings.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:padding="16dp"> <ListView android:id="@+id/past_bookings_list" android:layout_width="match_parent" android:layout_height="match_parent" /> </LinearLayout>
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//PastBookingsFragment.java

public class PastBookingsFragment extends Fragment { private ListView pastBookingsListView; private ArrayAdapter<String> adapter; private ArrayList<String> pastBookings; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_past_bookings, container, false); pastBookingsListView = view.findViewById(R.id.past_bookings_list); pastBookings = new ArrayList<>(); // Retrieve past bookings from SQLite database SQLiteDatabase db = getActivity().openOrCreateDatabase("TravelBookingDB", Context.MODE_PRIVATE, null); Cursor cursor = db.rawQuery("SELECT * FROM bookings", null); while (cursor.moveToNext()) { String bookingDetails = "Name: " + cursor.getString(0) + "\nAge: " + cursor.getString(1) + "\nDate: " + cursor.getString(2) + "\nTime: " + cursor.getString(3) + "\nSeat Type: " + cursor.getString(4); pastBookings.add(bookingDetails); } cursor.close(); adapter = new ArrayAdapter<>(getActivity(), android.R.layout.simple_list_item_1, pastBookings); pastBookingsListView.setAdapter(adapter); return view; } }
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//fragment_profile.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:padding="16dp"> <TextView android:id="@+id/username_text" android:layout_width="match_parent" android:layout_height="wrap_content" android:textSize="18sp" /> <Button android:id="@+id/logout_button" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Logout" /> </LinearLayout>
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//ProfileFragment.java

public class ProfileFragment extends Fragment { private usernameTextView; private Button logoutButton; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_profile, container, false); usernameTextView = view.findViewById(R.id.username_text); logoutButton = view.findViewById(R.id.logout_button); // Retrieve username from shared preferences or intent SharedPreferences sharedPreferences = getActivity().getSharedPreferences("UserPrefs", Context.MODE_PRIVATE); String username = sharedPreferences.getString("username", "Guest"); usernameTextView.setText("Username: " + username); logoutButton.setOnClickListener(v -> { // Handle logout logic here SharedPreferences.Editor editor = sharedPreferences.edit(); editor.clear(); editor.apply(); // Navigate back to login/signup activity Intent intent = new Intent(getActivity(), LoginSignupActivity.class); startActivity(intent); getActivity().finish(); }); return view; } }
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