IDEA的笔记L3

---

知识总结

编译后运行效果图：

MainActivity代码

/** * This app displays an order form to order coffee. */public class MainActivity extends ActionBarActivity {private int quantity = 2;@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.myjustjava);}public void increment(View view) {    if (quantity == 100) {        Toast.makeText(this, "喝这么多你会睡不着觉的！！！", Toast.LENGTH_SHORT).show();        return;    }    quantity = quantity + 1;    display(quantity);}public void decrement(View view) {    if (quantity == 1) {        Toast.makeText(this, "就剩一杯了你还想怎么样！！！", Toast.LENGTH_SHORT).show();        return;    }    quantity = quantity - 1;    display(quantity);}/** * This method is called when the order button is clicked. */public void submitOrder(View view) {    String name = "NO Name";    EditText nameField = (EditText) findViewById(R.id.name_field);    if (!nameField.getText().toString().equals("")) {        name = nameField.getText().toString();    }    CheckBox whippedCreamCheckBox = (CheckBox) findViewById(R.id.whipped_cream_checkbox);    Boolean haswhippedCream = whippedCreamCheckBox.isChecked();    CheckBox chocolateCheckBox = (CheckBox) findViewById(R.id.chocolate_checkbox);    Boolean haschocolate = chocolateCheckBox.isChecked();    String message = createOrderSummary(name, haswhippedCream, haschocolate, calculatePrice(haswhippedCream, haschocolate));    Intent intent = new Intent(Intent.ACTION_SENDTO);    intent.setData(Uri.parse("mailto:"));    intent.putExtra(Intent.EXTRA_SUBJECT, "Just Java order for " + name);    intent.putExtra(Intent.EXTRA_TEXT, message);    if (intent.resolveActivity(getPackageManager()) != null) {        startActivity(intent);    }}/** * Calculates the price of the order. * * @return total price */private int calculatePrice(boolean addwhippedCream, boolean addchocolate) {    int basePrice = 5;    if (addwhippedCream) {        basePrice = basePrice + 1;    }    if (addchocolate) {        basePrice = basePrice + 2;    }    return basePrice * quantity;}/** * Create summary of the order. * * @param price           of the order * @param haswhippedCream whether there is whipped Cream * @return text summary */private String createOrderSummary(String name, boolean haswhippedCream, boolean haschocolate, int price) {    String priceMessage = "Name: " + name + "\nAdd Whipped Cream? " + haswhippedCream + "\nAdd Chocolate? " + haschocolate + "\nQuantity: " + quantity + "\nAmount Due $ " + price + "\nThank you !";    return 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);}}  

XML代码

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><ScrollView    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="@android:color/white">    <RelativeLayout        android:layout_width="match_parent"        android:layout_height="match_parent"        android:padding="16dp">        <EditText            android:id="@+id/name_field"            android:layout_width="match_parent"            android:layout_height="wrap_content" />        <TextView            android:id="@+id/toppings_text"            style="@style/HeaderTextStyle"            android:layout_below="@+id/name_field"            android:text="Toppings" />        <CheckBox            android:id="@+id/whipped_cream_checkbox"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_below="@+id/toppings_text"            android:layout_centerHorizontal="true"            android:layout_marginTop="12dp"            android:duplicateParentState="false"            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_below="@+id/whipped_cream_checkbox"            android:layout_centerHorizontal="true"            android:layout_marginTop="12dp"            android:duplicateParentState="false"            android:paddingLeft="24dp"            android:text="Chocolate"            android:textSize="16sp" />        <TextView            android:id="@+id/quantity_text"            style="@style/HeaderTextStyle"            android:layout_below="@+id/chocolate_checkbox"            android:text="Quantity" />        <LinearLayout            android:id="@+id/linear_layout_view_group"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_below="@+id/quantity_text"            android:layout_centerInParent="true"            android:layout_marginTop="12dp"            android:orientation="horizontal">            <Button                android:layout_width="48dp"                android:layout_height="48dp"                android:layout_marginRight="18dp"                android:background="@android:color/holo_blue_light"                android:onClick="increment"                android:text="+"                android:textColor="@android:color/white" />            <TextView                android:id="@+id/quantity_text_view"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:layout_marginRight="18dp"                android:text="2"                android:textColor="@android:color/black"                android:textSize="16sp" />            <Button                android:layout_width="48dp"                android:layout_height="48dp"                android:background="@android:color/holo_blue_light"                android:onClick="decrement"                android:text="-"                android:textColor="@android:color/white" />        </LinearLayout>        <Button            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_alignParentRight="true"            android:layout_below="@id/linear_layout_view_group"            android:layout_marginTop="12dp"            android:background="@android:color/holo_blue_light"            android:onClick="submitOrder"            android:text="Order"            android:textColor="@android:color/white" />    </RelativeLayout></ScrollView></LinearLayout>

Styles代码

<resources><!-- Base application theme. --><style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">    <!-- Customize your theme here. -->    <item name="colorPrimary">#009688</item>    <item name="colorPrimaryDark">#00796B</item>    <item name="colorAccent">#536DFE</item></style><style name="CustomText">    <item name="android:textSize">20sp</item>    <item name="android:textColor">#4527A0</item>    <item name="android:textStyle">italic</item></style><style name="HeaderTextStyle">    <item name="android:layout_width">wrap_content</item>    <item name="android:layout_height">48dp</item>    <item name="android:gravity">center_vertical</item>    <item name="android:textAllCaps">true</item>    <item name="android:textSize">15sp</item></style></resources>