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- /**
- * IMPORTANT: Add your package below. Package name can be found in the project's AndroidManifest.xml file.
- * This is the package name our example uses:
- *
- * package com.example.android.justjava;
- *
- */
- package com.example.android.justjava;
- import android.os.Bundle;
- import android.support.v7.app.AppCompatActivity;
- import android.view.View;
- import android.widget.TextView;
- import java.text.NumberFormat;
- /**
- * This app displays an order form to order coffee.
- */
- public class MainActivity extends AppCompatActivity {
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
- }
- /**
- * This method is called when the order button is clicked.
- */
- public class Quantity{
- private int quantity;
- public Quantity(int n){
- quantity = n;
- }
- public Quantity(){
- quantity = 0;
- }
- public void increase(){
- quantity++;
- }
- public void decrease(){
- quantity--;
- }
- public int getQuantity(){
- return quantity;
- }
- }
- Quantity coffeeNumber = new Quantity();
- public static final int cofeePrice = 5;
- public void submitOrder(View view) {
- display(coffeeNumber.getQuantity());
- displayPrice(coffeeNumber.getQuantity() * cofeePrice);
- }
- /**
- * This method displays the given quantity value on the screen.
- */
- private void display(int number) {
- TextView quantityTextView = (TextView) findViewById(R.id.quantity_text_view);
- quantityTextView.setText("" + number);
- }
- /**
- * This method displays the given price on the screen.
- */
- private void displayPrice(int number) {
- TextView priceTextView = (TextView) findViewById(R.id.price_text_view);
- priceTextView.setText(NumberFormat.getCurrencyInstance().format(number));
- }
- public void addCoffee(View view) {
- coffeeNumber.increase();
- TextView quantityTextView = (TextView) findViewById(R.id.quantity_text_view);
- quantityTextView.setText("" + coffeeNumber.getQuantity());
- }
- public void substractCoffee(View view){
- coffeeNumber.decrease();
- TextView quantityTextView = (TextView) findViewById(R.id.quantity_text_view);
- quantityTextView.setText("" + coffeeNumber.getQuantity());
- }
- }
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