My Trial With Coffee Ordering App

<?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">

<RelativeLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:paddingLeft="5dp" android:paddingRight="5dp" >

<ImageView android:layout_width="match_parent" android:layout_height="match_parent" android:src="@drawable/images" android:scaleType="centerCrop" andr android:layout_gravity="top" />
<android.support.v7.widget.LinearLayoutCompat android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical">
<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"/>

</android.support.v7.widget.LinearLayoutCompat>


</RelativeLayout>

</LinearLayout>


JAVA CODE

 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 plus button is clicked. */ public void increment(View view) {
int quantity = 2;
quantity = quantity + 1;
display(quantity);

/** * This method is called when the minus button is clicked. */ }
public void decrement(View view) {
int quantity = 2;
quantity = quantity - 1;
display(quantity);



}
public void submitOrder(View view) {
int quantity = 5;
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);
}
}

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