Starting code for the Coffee Ordering App's MainActivity.java

MainActivity.java

package your.package.name;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    // Global variable for quantity
    ...

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    /**
     * This method is called when the plus button is clicked.
     */
    public void increment(View view) {
        // Your code here
        ...
    }

    /**
     * This method is called when the minus button is clicked.
     */
    public void decrement(View view) {
        // Your code here
        ...
    }

    /**
     * This method is called when the order button is clicked.
     *
     * @param view The View whose onclick attribute has the value "submitOrder"
     */
    public void submitOrder(View view) {
        // Your code here
        ...
    }

    /**
     * Display the given number in quantity_text_view.
     *
     * @param number The number to be displayed in quantity_text_view
     */
    private void displayNumber(int number) {
        TextView quantityTextView = (TextView) findViewById(R.id.quantity_text_view);
        quantityTextView.setText(String.valueOf(number));
    }

    /**
     * Display the given text in price_text_view.
     *
     * @param message The message to be displayed in price_text_view
     */
    private void displayMessage(String message) {
        TextView priceTextView = (TextView) findViewById(R.id.price_text_view);
        priceTextView.setText(message);
    }
}