studyjams 3B better android
16lz
2021-01-23
这是其中最后一次作业,备份到此。
1 target
本节目标将给出一个优化版本的order coffee.
知识点有:
- 使用intent联通其他app
- 利用style.xml 可以复用style
- 利用string.xml 分离语言和逻辑
- 更多调试android的方法,比如log + toast
- 使用scrollview
- 更多的控件,比如checkbox
2 demo show
3 demo code
main_activity.java
package com.example.android.justjava;import android.content.Intent;import android.net.Uri;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.text.Editable;import android.view.View;import android.widget.CheckBox;import android.widget.EditText;import android.widget.TextView;import java.text.NumberFormat;/** * 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); } /** * This method is called when the plus button is clicked. */ public void increment(View view) { if (quantity == 100) { return; } quantity = quantity + 1; displayQuantity(quantity); } /** * This method is called when the minus button is clicked. */ public void decrement(View view) { if (quantity == 0) { return; } quantity = quantity - 1; displayQuantity(quantity); } /** * This method is called when the order button is clicked. */ public void submitOrder(View view) { // Get user's name EditText nameField = (EditText) findViewById(R.id.name_field); Editable nameEditable = nameField.getText(); String name = nameEditable.toString(); // Figure out if the user wants whipped cream topping CheckBox whippedCreamCheckBox = (CheckBox) findViewById(R.id.whipped_cream_checkbox); boolean hasWhippedCream = whippedCreamCheckBox.isChecked(); // Figure out if the user wants whipped cream topping CheckBox chocolateCheckBox = (CheckBox) findViewById(R.id.chocolate_checkbox); boolean hasChocolate = chocolateCheckBox.isChecked(); // Calculate the price int price = calculatePrice(hasWhippedCream, hasChocolate); // Display the order summary on the screen String message = createOrderSummary(name, price, hasWhippedCream, hasChocolate); TextView resTextView = (TextView) findViewById( R.id.result); resTextView.setText(message); // Use an intent to launch an email app. // Send the order summary in the email body. //鉴于国内的环境,note2没有触发出email邮件app Intent intent = new Intent(Intent.ACTION_SENDTO); intent.setData(Uri.parse("mailto:")); // only email apps should handle this intent.putExtra(Intent.EXTRA_SUBJECT, getString(R.string.order_summary_email_subject, name)); intent.putExtra(Intent.EXTRA_TEXT, message); if (intent.resolveActivity(getPackageManager()) != null) { startActivity(intent); } } /** * Calculates the price of the order. * * @param addWhippedCream is whether or not we should include whipped cream topping in the price * @param addChocolate is whether or not we should include whipped cream topping in the price * @return total price */ private int calculatePrice(boolean addWhippedCream, boolean addChocolate) { // First calculate the price of one cup of coffee int basePrice = 5; // If the user wants whipped cream, add $1 per cup if (addWhippedCream) { basePrice = basePrice + 1; } // If the user wants chocolate, add $2 per cup if (addChocolate) { basePrice = basePrice + 2; } // Calculate the total order price by multiplying by the quantity return quantity * basePrice; } /** * Create summary of the order. * * @param name on the order * @param price of the order * @param addWhippedCream is whether or not to add whipped cream to the coffee * @param addChocolate is whether or not to add chocolate to the coffee * @return text summary */ private String createOrderSummary(String name, int price, boolean addWhippedCream, boolean addChocolate) { String priceMessage = getString(R.string.order_summary_name, name); priceMessage += "\n" + getString(R.string.order_summary_whipped_cream, addWhippedCream); priceMessage += "\n" + getString(R.string.order_summary_chocolate, addChocolate); priceMessage += "\n" + getString(R.string.order_summary_quantity, quantity); priceMessage += "\n" + getString(R.string.order_summary_price, NumberFormat.getCurrencyInstance().format(price)); priceMessage += "\n" + getString(R.string.thank_you); return priceMessage; } /** * This method displays the given quantity value on the screen. */ private void displayQuantity(int numberOfCoffees) { TextView quantityTextView = (TextView) findViewById( R.id.quantity_text_view); quantityTextView.setText("" + numberOfCoffees); }}
layout.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="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"> <EditText android:id="@+id/name_field" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="@string/name" android:inputType="text" /> <TextView style="@style/HeaderTextStyle" android:text="@string/toppings" /> <CheckBox android:id="@+id/whipped_cream_checkbox" android:layout_width="wrap_content" android:layout_height="wrap_content" android:paddingLeft="24dp" android:text="@string/whipped_cream" android:textSize="16sp" /> <CheckBox android:id="@+id/chocolate_checkbox" android:layout_width="wrap_content" android:layout_height="wrap_content" android:paddingLeft="24dp" android:text="@string/chocolate" android:textSize="16sp" /> <TextView style="@style/HeaderTextStyle" android:text="@string/quantity" /> <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:paddingLeft="8dp" android:paddingRight="8dp" android:text="@string/initial_quantity_value" android:textColor="@android:color/black" android:textSize="16sp" /> <Button android:layout_width="48dp" android:layout_height="48dp" android:onClick="increment" android:text="+" /> </LinearLayout> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="16dp" android:onClick="submitOrder" android:text="@string/order" /> <TextView android:id="@+id/result" android:layout_width="wrap_content" android:layout_height="wrap_content" android:paddingLeft="8dp" android:paddingRight="8dp" android:text="@string/result" android:textColor="@android:color/black" android:textSize="16sp" /> </LinearLayout></ScrollView>
style.xml
<resources> <!-- Base application theme. --> <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar"> <!-- App branding color for the app bar --> <item name="colorPrimary">#009688</item> <!-- Darker variant for the status bar and contextual app bars --> <item name="colorPrimaryDark">#00796B</item> <!-- Theme UI controls like checkboxes and text fields --> <item name="colorAccent">#536DFE</item> </style> <!-- Style for header text in the order form --> <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>
string.xml
<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2"> <!-- Title for the application. [CHAR LIMIT=12] --> <string name="app_name">studyjams Coffee</string> <!-- Hint text display in the empty field for the user's name [CHAR LIMIT=20] --> <string name="name">Name</string> <!-- Hint text display in the empty field for the user's name [CHAR LIMIT=20] --> <string name="toppings">Toppings</string> <!-- Hint text display in the empty field for the user's name [CHAR LIMIT=20] --> <string name="whipped_cream">Whipped cream</string> <!-- Hint text display in the empty field for the user's name [CHAR LIMIT=20] --> <string name="chocolate">Chocolate</string> <!-- Hint text display in the empty field for the user's name [CHAR LIMIT=20] --> <string name="quantity">Quantity</string> <!-- Hint text display in the empty field for the user's name [CHAR LIMIT=5] --> <string name="initial_quantity_value">2</string> <!-- Hint text display in the empty field for the user's name [CHAR LIMIT=20] --> <string name="order">Order</string> <!-- Name for the order summary. It will be shown in the format of "Name: Amy" where Amy is the user's name. [CHAR LIMIT=NONE] --> <string name="order_summary_name">Name: <xliff:g id="name" example="Amy">%s</xliff:g></string> <!-- Whipped cream topping for the order summary. It will be shown in the format of "Add whipped cream? true" or "Add whipped cream? false". [CHAR LIMIT=NONE] --> <string name="order_summary_whipped_cream">Add whipped cream? <xliff:g id="addWhippedCream" example="true">%b</xliff:g></string> <!-- Chocolate topping for the order summary. It will be shown in the format of "Add chocolate? true" or "Add chocolate? false". [CHAR LIMIT=NONE] --> <string name="order_summary_chocolate">Add chocolate? <xliff:g id="addChocolate" example="true">%b</xliff:g></string> <!-- Quantity of coffee cups for the order summary. It will be shown in the format of "Quantity: 2", where 2 is the number of cups ordered. [CHAR LIMIT=NONE] --> <string name="order_summary_quantity">Quantity: <xliff:g id="quantity" example="2">%d</xliff:g></string> <string name="result">Report: <xliff:g id="result" example="">%s</xliff:g></string> <!-- Total price for the order summary. It will be shown in the format of "Total: $10" where $10 is the price. [CHAR LIMIT=NONE] --> <string name="order_summary_price">Total: <xliff:g id="price" example="$10">%s</xliff:g></string> <!-- Thank you message for the order summary. [CHAR LIMIT=NONE] --> <string name="thank_you">Thank you! 君莫要贪杯!</string> <!-- Subject line for the order summary email. It will be in the format of "Just Java order for Amy" where Amy is the user's name. [CHAR LIMIT=NONE] --> <string name="order_summary_email_subject">Just Java order for <xliff:g id="name" example="Amy">%s</xliff:g></string></resources>
4 notes
about the structure
about the android intent
谢谢网友的认真整理,在这里
END
发帖工具真的很好用.
期末大作业见.感谢studyjams提供这么好的平台!!
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