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Udacity Google Android Course Level 06 Final 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:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="16dp"
tools:context=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="8dp"
android:text="QUANTITY" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:layout_width="45dp"
android:layout_height="45dp"
android:onClick="decrement"
android:padding="8dp"
android:text="-" />
<TextView
android:id="@+id/quantity_text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="8dp"
android:text="0"
android:textColor="#000000"
android:textSize="16sp" />
<Button
android:layout_width="45dp"
android:layout_height="45dp"
android:onClick="increment"
android:padding="8dp"
android:text="+" />
</LinearLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="8dp"
android:text="Price:"
android:textColor="#000000"
android:textSize="16sp" />
<TextView
android:id="@+id/price_text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="8dp"
android:textColor="#000000"
android:textSize="16sp"
android:text="0"
/>
<Button
android:id="@+id/order_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="submitOrder"
android:padding="8dp"
android:text="order!" />
</LinearLayout>
package com.example.android.justjava;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.TextView;
/**
* This app displays an order form to order coffee.
*/
public class MainActivity extends AppCompatActivity {
int quantity = 2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
display(quantity);
}
/**
* This method is called when the plus button is clicked.
*/
public void increment(View view) {
quantity++;
display(quantity);
}
/**
* This method is called when the minus button is clicked.
*/
public void decrement(View view) {
if (quantity > 0) quantity--;
display(quantity);
}
/**
* This method is called when the order button is clicked.
*/
public void submitOrder(View view) {
String priceMessage = "Total: $" + (quantity * 5) + "\nThank you!";
displayMessage(priceMessage);
}
/**
* 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);
}
/**
* This method displays the given price value 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 text on the screen.
*/
private void displayMessage(String message) {
TextView priceTextView = (TextView) findViewById(R.id.price_text_view);
priceTextView.setText(message);
}
}
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