커피 주문 앱 소스

activity_main.xml

<ScrollView 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"
    tools:context=".MainActivity">

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

        <EditText
            android:id="@+id/name_edit_text"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="16dp"
            android:hint="Name"
            android:singleLine="true" />

        <TextView
            style="@style/TextCategory"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Toppings" />

        <CheckBox
            android:id="@+id/whip_checkbox"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingLeft="24dp"
            android:text="Whipped cream"
            android:textSize="16sp" />

        <CheckBox
            android:id="@+id/chocolate_checkbox"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="16dp"
            android:paddingLeft="24dp"
            android:text="Chocolate"
            android:textSize="16sp" />


        <TextView
            style="@style/TextCategory"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/quantity" />

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">

            <Button
                android:layout_width="48dp"
                android:layout_height="48dp"
                android:layout_marginBottom="16dp"
                android:onClick="decrement"
                android:text="-" />

            <TextView
                android:id="@+id/quantity_text_view"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="8dp"
                android:layout_marginRight="8dp"
                android:text="0"
                android:textColor="#000000"
                android:textSize="16sp" />

            <Button
                android:layout_width="48dp"
                android:layout_height="48dp"
                android:onClick="increment"
                android:text="+" />
        </LinearLayout>

        <TextView
            style="@style/TextCategory"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Order Summary" />

        <TextView
            android:id="@+id/price_text_view"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="16dp"
            android:textColor="#000000"
            android:textSize="16sp" />

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

    </LinearLayout>
</ScrollView>

MainActivity.java

public class MainActivity extends AppCompatActivity {
    private static final String TAG = MainActivity.class.getSimpleName();

    private final int PRICE_COFFEE = 2500;
    private final int PRICE_WHIP = 500;
    private final int PRICE_CHOCOLATE = 300;

    private int mQuantity = 0;

    private TextView mPriceTextView;
    private TextView mQuantityTextView;
    private CheckBox mWhipCheckBox;
    private CheckBox mChocolateCheckBox;
    private EditText mNameEditText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mPriceTextView = (TextView) findViewById(R.id.price_text_view);
        mQuantityTextView = (TextView) findViewById(R.id.quantity_text_view);
        mWhipCheckBox = (CheckBox) findViewById(R.id.whip_checkbox);
        mChocolateCheckBox = (CheckBox) findViewById(R.id.chocolate_checkbox);
        mNameEditText = (EditText) findViewById(R.id.name_edit_text);
    }

    /**
     * 주문 버튼 이벤트 처리
     *
     * @param view 이벤트 처리 할 view
     */
    public void submitOrder(View view) {
        String name = "Name : " + mNameEditText.getText();
        String whip = "Add whipped cream? " + mWhipCheckBox.isChecked();
        String chocolate = "Add chocolate? " + mChocolateCheckBox.isChecked();
        String quantity = "Quantity : " + mQuantity;

        int price = PRICE_COFFEE * mQuantity;

        if (mWhipCheckBox.isChecked()) {
            price += mQuantity * PRICE_WHIP;
        }
        if (mChocolateCheckBox.isChecked()) {
            price += mQuantity * PRICE_CHOCOLATE;
        }

        String formattedPrice = "Total : "
                + NumberFormat.getCurrencyInstance().format(price);

        String message = name + "\n"
                + whip + "\n"
                + chocolate + "\n"
                + quantity + "\n"
                + formattedPrice + "\n"
                + "Thank you!";

        displayMessage(message);

        // 전화걸기 예제
        // Uri uri = Uri.parse("tel:01048993729");
        // Intent intent = new Intent(Intent.ACTION_DIAL, uri);
        // startActivity(intent);

        String[] addresses = new String[] {
                "master@suwonsmartapp.com"
        };
        composeEmail(addresses, "커피 주문 메일", null, message);
    }

    /**
     * 메일 보내기
     * 
     * @param addresses 받을 사람
     * @param subject 제목
     * @param attachment 첨부
     * @param text 내용
     */
    public void composeEmail(String[] addresses, String subject, Uri attachment, String text) {
        Intent intent = new Intent(Intent.ACTION_SEND);
        intent.setType("text/plain");
        intent.putExtra(Intent.EXTRA_EMAIL, addresses);
        intent.putExtra(Intent.EXTRA_SUBJECT, subject);
        intent.putExtra(Intent.EXTRA_STREAM, attachment);
        intent.putExtra(Intent.EXTRA_TEXT, text);
        if (intent.resolveActivity(getPackageManager()) != null) {
            startActivity(intent);
        }
    }

    public void increment(View view) {
        mQuantity++;

        if (mQuantity > 100) {
            mQuantity = 100;
            Toast.makeText(getApplicationContext(), "100 개 이상 주문 안 되요", Toast.LENGTH_SHORT).show();
        }

        display(mQuantity);
        displayPrice(PRICE_COFFEE * mQuantity);
    }

    public void decrement(View view) {
        mQuantity--;

        if (mQuantity < 0) {
            mQuantity = 0;
            Toast.makeText(MainActivity.this, "0 개 이하 주문 안 되요", Toast.LENGTH_SHORT).show();
        }

        display(mQuantity);
        displayPrice(PRICE_COFFEE * mQuantity);
    }

    /**
     * 수량을 화면에 표시
     *
     * @param number 표시 할 수량
     */
    private void display(int number) {
        mQuantityTextView.setText("" + number);
    }

    private void displayPrice(int number) {
        mPriceTextView.setText(NumberFormat.getCurrencyInstance().format(number));
    }

    private void displayMessage(String message) {
        mPriceTextView.setText(message);
    }

}

styles.xml

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
    </style>

    <!-- 카테고리 스타일 정의 -->
    <style name="TextCategory">
        <item name="android:layout_marginBottom">16dp</item>
        <item name="android:textAllCaps">true</item>
    </style>

</resources>