Android工作室canot解析符號，不會編譯

Question

我的代碼不會編譯，我不知道如何解決它。變量addWhippedCream和addChocolate給我一個錯誤，當我嘗試將它們傳入calculatePrice方法從orderSummary方法。我試圖讓它們成爲全局變量，但這會產生運行時錯誤

package com.example.android.justjava; 

    import android.graphics.Color; 
    import android.os.Bundle; 
    import android.support.v7.app.ActionBarActivity; 
    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 ActionBarActivity { 

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



/** 
* This method is called when the order button is clicked. 
*/ 
public void submitOrder(View view) { 
    int price=5; 

    EditText Name = (EditText)findViewById(R.id.name_view); 
    int total=calculatePrice(price, addWhippedCream, addChocolate); 
    CheckBox checkBox = (CheckBox) findViewById(R.id.whipped_cream_checkBox); 
    CheckBox checkBox2 = (CheckBox) findViewById(R.id.Chocolate_checkBox); 
    boolean addWhippedCream=checkBox.isChecked(); 
    boolean addChocolate=checkBox2.isChecked(); 
    String customerName= Name.getText().toString(); 
    displayMessage (createOrderSummary(total,addWhippedCream,addChocolate,customerName)); 
} 


int quantity = 2; 
public void increment(View view){ 

    quantity = quantity + 1; 
    if (quantity==100){ 
     return; 
    } 
    displayQuantity(quantity); 
} 

public void decrement (View view){ 

    quantity = quantity - 1; 

    if (quantity==1) { 
     return; 
    } 
    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); 
} 
/** 
* This method displays the given text on the screen. 
*/ 
private void displayMessage(String message) { 
    TextView orderSummaryTextView = (TextView) findViewById(R.id.order_summary_text_view); 
    orderSummaryTextView.setText(message); 
    orderSummaryTextView.setTextColor(Color.WHITE); 
} 

private int calculatePrice(int price, boolean addWhippedCream, boolean addChocolate){ 
    int total = quantity * price; 

    if (addWhippedCream){ 
     total=total+1; 
    } 

    if (addChocolate) { 
     total=total+2; 
    } 
    return total; 
} 

/*creates orderSummary 
* 
* takes in int total, boolean isChecked, boolean isChecked2, String customerName 
* 
* @returns orderSummary 
*/ 
private String createOrderSummary(int total, boolean addWhippedCream, boolean addChocolate, String customerName){ 
    String orderSummary = "Name: " + customerName + 
      "\nAdd whipped cream? " + addWhippedCream + 
      "\nAdd chocolate? " + addChocolate + 
      "\nQuantity: " + quantity + 
      "\nTotal: $" + total + 
      "\nThank you!"; 
    return orderSummary; 
} 


} 

Answer 1

您必須在使用它們之前聲明變量。你有

int total=calculatePrice(price, addWhippedCream, addChocolate); 
//code 
boolean addWhippedCream=checkBox.isChecked(); 
boolean addChocolate=checkBox2.isChecked(); 

但要聲明切換到你叫聲明addWhippedCream和addChocolate變量之前的方法calculatePrice（價格，addWhippedCream，addChocolate）通話

boolean addWhippedCream=checkBox.isChecked(); 
boolean addChocolate=checkBox2.isChecked(); 
int total=calculatePrice(price, addWhippedCream, addChocolate);