ORDER COFFEE INITIAL HALF CODE

<?xml version="2.0" 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"    tools:context=".MainActivity">

    <TextView        

android:layout_width="wrap_content"        

android:layout_height="wrap_content"        

android:layout_margin="16dp"        

android:text="quantity"        

android:textAllCaps="true"/>

    <Button        

android:id="@+id/button3"        

android:layout_width="48dp"        

android:layout_height="48dp"        

android:onClick="increment"        

android:layout_marginBottom="16dp"        

android:layout_marginLeft="16dp"        

android:text="+" />

    <TextView        

android:id="@+id/quantity_text_view"        

android:layout_width="wrap_content"        

android:layout_height="wrap_content"        

android:layout_marginBottom="16dp"        

android:layout_marginLeft="16dp"        

android:text="0"        

android:textColor="#000000"        

android:textSize="16sp"/>

    <Button        

android:id="@+id/button4"        

android:layout_width="48dp"        

android:layout_height="48dp"        

android:onClick="decrement"        

android:layout_marginLeft="16dp"        

android:text="-" />

    <TextView        

android:layout_width="wrap_content"        

android:layout_height="wrap_content"        

android:layout_marginStart="16dp"        

android:layout_marginTop="16dp"        

android:text="price"        

android:textAllCaps="true"/>
    <TextView        

android:id="@+id/price_text_view"        

android:layout_width="wrap_content"       

android:layout_height="wrap_content"        

android:layout_marginLeft="16dp"        

android:layout_marginTop="16dp"        

android:text="$0"        

android:textColor="#000000"        

android:textSize="16sp"/>

    <Button        

android:id="@+id/button"        

android:layout_width="wrap_content"        

android:layout_height="wrap_content"        

android:layout_marginLeft="16dp"        

android:layout_marginTop="16dp"        

android:onClick="submitOrder"        

android:text="order"        

android:textAllCaps="true"/>

</LinearLayout>

JAVA CODE FOR COFFEE ORDER

package com.example.android.justjava;

/** * 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: * <p>
 * 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 void increment(View view) {
        int quantity = 3;
        display(quantity);
        displayPrice(quantity * 5);

    }
    public void decrement(View view) {
        int quantity = 1;
        display(quantity);
        displayPrice(quantity * 5);


    }
    public void submitOrder(View view) {
        int quantity = 2;
        display(quantity);
        displayPrice(quantity * 5);
    }

    /**     * 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));
    }

    /**     * 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);
    }
}

SCREEN SHOT