// MainActivity.java
package com.example.grocerylist;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class MainActivity extends AppCompatActivity {
private EditText itemNameEditText;
private EditText itemCostEditText;
private Button addItemButton;
private Spinner itemsSpinner;
private LinearLayout selectedItemsLayout;
private TextView totalCostTextView;
private Button calculateTotalButton;
private SQLiteDatabase database;
private static final String DATABASE_NAME = "GroceryList";
private static final String TABLE_GROCERY = "grocery_items";
private static final String COLUMN_ID = "id";
private static final String COLUMN_NAME = "name";
private static final String COLUMN_COST = "cost";
private List<String> itemNames = new ArrayList<>();
private Map<String, Double> itemCosts = new HashMap<>();
private Map<String, Boolean> selectedItems = new HashMap<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Initialize UI elements
itemNameEditText = findViewById(R.id.itemNameEditText);
itemCostEditText = findViewById(R.id.itemCostEditText);
addItemButton = findViewById(R.id.addItemButton);
itemsSpinner = findViewById(R.id.itemsSpinner);
selectedItemsLayout = findViewById(R.id.selectedItemsLayout);
totalCostTextView = findViewById(R.id.totalCostTextView);
calculateTotalButton = findViewById(R.id.calculateTotalButton);
// Create or open the database
database = openOrCreateDatabase(DATABASE_NAME, MODE_PRIVATE, null);
// Create the grocery table if it doesn't exist
database.execSQL(
"CREATE TABLE IF NOT EXISTS " + TABLE_GROCERY + " (" +
COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
COLUMN_NAME + " TEXT UNIQUE, " +
COLUMN_COST + " REAL)");
// Load grocery items from database
loadGroceryItems();
// Set up spinner
setupSpinner();
// Add item button click listener
addItemButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
addGroceryItem();
}
});
// Calculate total button click listener
calculateTotalButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
calculateTotal();
}
});
}
private void setupSpinner() {
ArrayAdapter<String> adapter = new ArrayAdapter<>(
this, android.R.layout.simple_spinner_item, itemNames);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
itemsSpinner.setAdapter(adapter);
itemsSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String selectedItem = itemNames.get(position);
addItemToSelection(selectedItem);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
// Do nothing
}
});
}
private void loadGroceryItems() {
// Clear existing data
itemNames.clear();
itemCosts.clear();
// Query all items from the database
Cursor cursor = database.rawQuery("SELECT * FROM " + TABLE_GROCERY, null);
if (cursor.moveToFirst()) {
int nameIndex = cursor.getColumnIndex(COLUMN_NAME);
int costIndex = cursor.getColumnIndex(COLUMN_COST);
if (nameIndex >= 0 && costIndex >= 0) {
do {
String name = cursor.getString(nameIndex);
double cost = cursor.getDouble(costIndex);
itemNames.add(name);
itemCosts.put(name, cost);
} while (cursor.moveToNext());
}
}
cursor.close();
}
private void addGroceryItem() {
String itemName = itemNameEditText.getText().toString().trim();
String costString = itemCostEditText.getText().toString().trim();
if (itemName.isEmpty() || costString.isEmpty()) {
Toast.makeText(this, "Please enter both item name and cost", Toast.LENGTH_SHORT).show();
return;
}
try {
double cost = Double.parseDouble(costString);
ContentValues values = new ContentValues();
values.put(COLUMN_NAME, itemName);
values.put(COLUMN_COST, cost);
// Try to insert the item
long result = database.insert(TABLE_GROCERY, null, values);
if (result == -1) {
// If insert failed, try to update instead (item might already exist)
int updateResult = database.update(TABLE_GROCERY, values, COLUMN_NAME + " = ?",
new String[]{itemName});
if (updateResult > 0) {
Toast.makeText(this, "Item updated successfully", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "Failed to add item", Toast.LENGTH_SHORT).show();
return;
}
} else {
Toast.makeText(this, "Item added successfully", Toast.LENGTH_SHORT).show();
}
// Clear input fields
itemNameEditText.setText("");
itemCostEditText.setText("");
// Reload grocery items
loadGroceryItems();
// Update spinner
((ArrayAdapter) itemsSpinner.getAdapter()).notifyDataSetChanged();
} catch (NumberFormatException e) {
Toast.makeText(this, "Please enter a valid cost", Toast.LENGTH_SHORT).show();
}
}
private void addItemToSelection(final String itemName) {
// Check if the item is already in the selection layout
for (int i = 0; i < selectedItemsLayout.getChildCount(); i++) {
View view = selectedItemsLayout.getChildAt(i);
if (view instanceof CheckBox) {
CheckBox checkBox = (CheckBox) view;
if (checkBox.getText().toString().equals(itemName)) {
// Item already exists in selection, just return
return;
}
}
}
// Create a new checkbox for the selected item
final CheckBox itemCheckBox = new CheckBox(this);
itemCheckBox.setText(itemName);
itemCheckBox.setChecked(true);
// Add the item to the selected items map
selectedItems.put(itemName, true);
// Set checkbox change listener
itemCheckBox.setOnCheckedChangeListener((buttonView, isChecked) -> {
selectedItems.put(itemName, isChecked);
});
// Add checkbox to layout
selectedItemsLayout.addView(itemCheckBox);
}
private void calculateTotal() {
double total = 0.0;
// Iterate through selected items
for (Map.Entry<String, Boolean> entry : selectedItems.entrySet()) {
if (entry.getValue()) {
String itemName = entry.getKey();
Double cost = itemCosts.get(itemName);
if (cost != null) {
total += cost;
}
}
}
// Display the total cost
totalCostTextView.setText(String.format("Total Cost: $%.2f", total));
}
@Override
protected void onDestroy() {
database.close();
super.onDestroy();
}
}
//main_activity.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="16dp"
tools:context=".MainActivity">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Grocery List"
android:textSize="24sp"
android:textStyle="bold"
android:gravity="center"
android:layout_marginBottom="16dp" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Add Grocery Item"
android:textSize="18sp"
android:textStyle="bold"
android:layout_marginBottom="8dp" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginBottom="8dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Item Name:"
android:layout_gravity="center_vertical" />
<EditText
android:id="@+id/itemNameEditText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter item name"
android:minHeight="48dp"
android:inputType="text"
android:layout_marginStart="8dp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginBottom="16dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Item Cost: $"
android:layout_gravity="center_vertical" />
<EditText
android:id="@+id/itemCostEditText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter cost"
android:minHeight="48dp"
android:inputType="numberDecimal"
android:layout_marginStart="8dp" />
</LinearLayout>
<Button
android:id="@+id/addItemButton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Add Item"
android:minHeight="48dp"
android:layout_marginBottom="24dp" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Select Items"
android:textSize="18sp"
android:textStyle="bold"
android:layout_marginBottom="8dp" />
<Spinner
android:id="@+id/itemsSpinner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="48dp"
android:layout_marginBottom="16dp" />
<TextView
android:id="@+id/selectedItemsLabel"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Selected Items"
android:textSize="18sp"
android:textStyle="bold"
android:layout_marginBottom="8dp" />
<ScrollView
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:contentDescription="List of selected grocery items"
android:importantForAccessibility="yes"
android:labelFor="@id/selectedItemsLayout">
<LinearLayout
android:id="@+id/selectedItemsLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" />
</ScrollView>
<Button
android:id="@+id/calculateTotalButton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Calculate Total"
android:minHeight="48dp"
android:layout_marginTop="16dp"
android:layout_marginBottom="8dp" />
<TextView
android:id="@+id/totalCostTextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Total Cost: $0.00"
android:textSize="20sp"
android:textStyle="bold"
android:gravity="center" />
</LinearLayout>
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