Just Java Final Code With No Errors With No U.I

JUST JAVA

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 {
    int quantity = 0;
    @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) {

            quantity = quantity + 1;
            display(quantity);

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

            quantity = quantity - 1;
            display(quantity);



    }
    public void submitOrder(View view) {

        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);
    }
}

XML 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>