Nested View and Quantity Picker 3rd project

input

xml code

<?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:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.saketh.firstprojectman.MainActivity">


    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="16dp"
        android:text="quantity"
        android:textAllCaps="true" />


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">


        <Button
            android:layout_width="48dp"


            android:layout_height="48dp"
            android:onClick="decrement"


            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="8dp"
            android:text="0"
            android:textAllCaps="true"
            android:textColor="@android:color/black"
            android:textSize="16sp"
            android:paddingLeft="8dp"
            android:paddingRight="8dp"/>


        <Button
            android:layout_width="48dp"


            android:layout_height="48dp"
            android:layout_marginLeft="8dp"
            android:onClick="increment"
            android:text="+" />
    </LinearLayout>


    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="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_marginBottom="16dp"
        android:text="0"
        android:textAllCaps="true"
        android:textColor="@android:color/black"
        android:textSize="16sp" />


    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="submitOrder"
        android:text="order" />


</LinearLayout>








                      java code


package com.example.saketh.firstprojectman; /**
 * 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;
 */


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




import com.example.saketh.firstprojectman.R;


import static android.icu.text.NumberFormat.getCurrencyInstance;


/**
 * This app displays an order form to order coffee.
 */
public class MainActivity extends AppCompatActivity {
    int quantity=0;


    @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 submitOrder(View view) {
        int numberOfCoffee=quantity;
        display(numberOfCoffee);
        priceBox(numberOfCoffee*2);
    }


    /**
     * 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);
    }
    private void priceBox(int number){
        TextView pricetext=(TextView) findViewById(R.id.price_text_view);
        pricetext.setText(NumberFormat.getCurrencyInstance().format(number));
    }
    public void increment(View view){


        quantity=quantity+1;
        display(quantity);
    }
    public void decrement(View view){


        quantity=quantity-1;
        display(quantity);


    }
}






output