刚写了一个styles.xml文件，但是所有对R的引用都没有解析。
干净并重建为第一步，但没有解决问题
values \ styles.xml文件
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>
<style name="ButtonStyle">
<item name="android:layout_width">R.dimen.dimension_2</item>
<item name="android:layout_height">R.dimen.dimension_2</item>
<item name="android:layout_marginTop">R.dimen.dimension_1</item>
<item name="android:textColor">R.color.color_black</item>
</style>
</resources>
values \ dimens.xml文件
<resources>
<!-- Default screen margins, per the Android Design guidelines. -->
<dimen name="activity_horizontal_margin">16dp</dimen>
<dimen name="activity_vertical_margin">16dp</dimen>
<dimen name="dimension_1">16dp</dimen>
<dimen name="dimension_2">48dp</dimen>
<dimen name="dimension_3">8dp</dimen>
<dimen name="dimension_4">24dp</dimen>
<dimen name="text_size_1">16sp</dimen>
</resources>
MainActivity.java文件
/**
* *Below added my unique package name "com.example.android.justjava3"
*/
package com.example.android.justjava3;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
/**
* This app displays an order form to order coffee, and displays the information.
* quantity is a global variable
**/
public class MainActivity extends AppCompatActivity {
int quantity = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
/**
* This method increments and displays quantity.
*/
public void increment(View view) {
if (quantity == 100) { //Allows out of range values initially
//show an error as toast
Toast.makeText(this, "You cannot have more than 100 coffees", Toast.LENGTH_SHORT).show();
return;
}
quantity = quantity + 1;
/*
if (quantity <= 99) {
quantity = quantity + 1;
}
*/
displayQuantity(quantity);
}
/**
* This method decrements and displays quantity.
*/
public void decrement(View view) {
if (quantity == 1) { //Allows out of range values initially
//show an error as toast
Toast.makeText(this, "You cannot have less than 1 coffee", Toast.LENGTH_SHORT).show();
return;
}
quantity = quantity - 1;
/* if (quantity >=1) {
quantity = quantity - 1;
}
*/
displayQuantity(quantity);
}
/**
* This method displays the given quantity value on the screen.
*/
private void displayQuantity(int number) {
TextView quantityTextView = (TextView) findViewById(R.id.quantity_text_view);
quantityTextView.setText("" + number); /**I am receiving a message that this should be a resource value **/
}
/**
* This method is called when the order button is clicked.
*/
public void submitOrder(View view) {
EditText nameTextView = (EditText) findViewById(R.id.name_text_view);
String inputName = nameTextView.getText().toString();
CheckBox whippedCreamCheckBox = (CheckBox) findViewById(R.id.whipped_cream_checkbox);
boolean hasWhippedCream = whippedCreamCheckBox.isChecked();
Log.v("MainActivity", "Has whipped cream: " + hasWhippedCream);
CheckBox chocolateCheckBox = (CheckBox) findViewById(R.id.chocolate_checkbox);
boolean hasChocolate = chocolateCheckBox.isChecked();
Log.v("MainActivity", "Has chocolate: " + hasChocolate);
int price = calculatePrice(hasWhippedCream, hasChocolate);
String priceMessage = createOrderSummary(price, quantity, hasWhippedCream, hasChocolate, inputName);
//Create email intent using priceMessage string
Intent intent = new Intent(Intent.ACTION_SEND);
intent.setType("text/html");
intent.putExtra(Intent.EXTRA_EMAIL, new String[]{"javamon@mindspring.com"});
intent.putExtra(Intent.EXTRA_SUBJECT, "JustJava Coffee Order for " + inputName);
intent.putExtra(Intent.EXTRA_TEXT, priceMessage);
startActivity(Intent.createChooser(intent, "Send Email"));
}
/**
* Calculates the total price of the order.
*
* @param addWhippedCream is whether or not the user wants whipped cream topping
* @param addChocolate is whether or not the user wants chocolate topping
* @return total price
*/
private int calculatePrice(boolean addWhippedCream, boolean addChocolate) {
int differentialPrice = 5;
if (addWhippedCream) {
differentialPrice = differentialPrice + 1;
}
if (addChocolate) {
differentialPrice = differentialPrice + 2;
}
return quantity * differentialPrice;
}
/**
* This method creates the order summary and returns a string.
*
* @param price of the order
* @param addWhippedCream informs whether the customer wants whipped cream
* @return text summary
*/
private String createOrderSummary(int price, int quantity, boolean addWhippedCream, boolean addChocolate, String inputName) {
String priceMessage = getString(R.string.text_line_11) + inputName;
priceMessage += "\n" + getString(R.string.text_line_12) + addWhippedCream;
priceMessage += "\n" + getString(R.string.text_line_13) + addChocolate;
priceMessage += "\n" + getString(R.string.text_line_14) + quantity;
priceMessage += "\n" + getString(R.string.text_line_15) + price;
priceMessage += "\n" + getString(R.string.text_line_16);
return priceMessage;
}
}
**activity_main.xml file**
<?xml version="1.0" encoding="utf-8"?>
<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="com.example.android.justjava3.MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="@dimen/dimension_1"
android:orientation="vertical">
<EditText
android:id="@+id/name_text_view"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="@string/text_person_name"
android:inputType="textPersonName" />
<TextView
android:id="@+id/label_text_view_3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/dimension_1"
android:text="@string/text_line_8"
android:textAllCaps="true"
android:textSize="@dimen/text_size_1" />
<CheckBox
android:id="@+id/whipped_cream_checkbox"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/dimension_1"
android:paddingLeft="@dimen/dimension_4"
android:text="@string/text_line_9"
android:textSize="@dimen/text_size_1" />
<CheckBox
android:id="@+id/chocolate_checkbox"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/dimension_1"
android:paddingLeft="@dimen/dimension_4"
android:text="@string/text_line_10"
android:textSize="@dimen/text_size_1" />
<TextView
android:id="@+id/label_text_view_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/dimension_1"
android:text="@string/text_line_1"
android:textAllCaps="true"
android:textSize="@dimen/text_size_1" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="@+id/button_1"
style="@style/ButtonStyle"
android:layout_width="@dimen/dimension_2"
android:layout_height="@dimen/dimension_2"
android:onClick="increment"
android:text="@string/text_line_2"
android:textAllCaps="true"
android:textSize="@dimen/text_size_1" />
<TextView
android:id="@+id/quantity_text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/dimension_1"
android:layout_toRightOf="@id/button_1"
android:text="@string/text_line_3"
android:textColor="@color/color_black"
android:textSize="@dimen/text_size_1" />
<Button
android:id="@+id/button_2"
android:layout_width="@dimen/dimension_2"
android:layout_height="@dimen/dimension_2"
android:layout_marginTop="@dimen/dimension_1"
android:layout_toRightOf="@id/quantity_text_view"
android:onClick="decrement"
android:text="@string/text_line_4"
android:textAllCaps="true"
android:textColor="@color/color_black"
android:textSize="@dimen/text_size_1" />
</LinearLayout>
<Button
android:id="@+id/button_3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/dimension_1"
android:onClick="submitOrder"
android:text="@string/text_line_7"
android:textAllCaps="true"
android:textColor="@color/color_black"
android:textSize="@dimen/text_size_1" />
</LinearLayout>
</ScrollView>
答案 0 :(得分：0)
<style name="ButtonStyle">
<item name="android:layout_width">@dimen/dimension_2</item>
<item name="android:layout_height">@dimen/dimension_2</item>
<item name="android:layout_marginTop">@dimen/dimension_1</item>
<item name="android:textColor">@colors/color_black</item>
</style>
像这样使用