在java中接收参数问题

我是新来的Android，并试图开发一个简单的Android应用程序。我试图将来自不同活动的两个值作为参数发送给第三个参数。问题是我使用这两个值的方法没有看到用户输入的值。提前致谢。该活动的代码是：在java中接收参数问题

public class NewAcount extends Activity { 

    private DecimalFormat twoDigits = new DecimalFormat("0.00"); 
    TextView final_Amount; 
    EditText price, amount_Entered; 
    double userr_Entered_Amount, itemPricee, result; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onCreate(savedInstanceState); 

     setContentView(R.layout.transparent); 
     // amount of money the user wants to spend daily 
     amount_Entered = (EditText) findViewById(R.id.et_Amount); 
     // item price 
     price = (EditText) findViewById(R.id.et_Price); 

     final_Amount = (TextView) findViewById(R.id.tv_Account_Result); 
     // set the text view value 
     final_Amount.setText(twoDigits.format(getTotal())); 

    } 

    public double getItemPrice(double itemPrice) { 
     this.itemPricee = itemPrice; 
     System.out.println("the item price in the new account activity is " 
       + itemPricee); 

     return itemPricee; 
    } 

    public double getUserAmountEntered(double user_Entered_Amount) { 

     this.userr_Entered_Amount = user_Entered_Amount; 
     System.out.println("the user amount in the new account activity is " 
       + userr_Entered_Amount); 

     return userr_Entered_Amount; 

    } 

    public double getTotal() { 
     // Here where the problem is. it's not seeing 
     // userr_Entered_Amount and itemPricee 
      // and returns result as zero 

result=getUserAmountEntered(userr_Entered_Amount)-getItemPrice(itemPricee); 

     System.out.println("the result is " + result); 
     return result; 
    } 

}

FinanceAppActivity.java 我送的输入量做：

if (amount_Entered.getText().toString().length() > 0) { 
     // start your expenses app activity 
     Intent openYourExpensesActivity = new Intent(
       "android.intent.action.FINANCESQLLITE"); 
     startActivity(openYourExpensesActivity); 
     double user_Entered_Amount=Double.parseDouble(amount_Entered.getText().toString()); 
     //send amount entered to new account activity   
     NewAcount na=new NewAcount();   
     na.getUserAmountEntered(user_Entered_Amount); 
    }

YourExpenses.java 发送商品价格

// to determine which button was clicked 
    switch (v.getId()) { 
    case R.id.btn_Add: 
     boolean didItWork = true; 
     try { 
      String itemName = item.getText().toString(); 
      itemPrice = Double.parseDouble(price.getText().toString());   
      Price entry = new Price(YourExpenses.this); 
      entry.open(); 
      // passing both strings to create entry method 
      entry.creatEntry(itemName, itemPrice); 
      entry.close(); 
      NewAcount na=new NewAcount(); 
      //send item price to new account activity 
      na.getItemPrice(itemPrice); 
     } catch (Exception e) { 
      //code here     
     } finally { 

      if (didItWork) { 
       Dialog d = new Dialog(this); 
       d.setTitle("Inserted successfully!"); 
       TextView tv = new TextView(this); 
       tv.setText("Success"); 
       d.setContentView(tv); 
       d.show(); 
       try { 
        Thread.sleep(500); 
       } catch (InterruptedException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } 

       Intent openNewAccount = new Intent("android.intent.action.TRANSPARENT"); 
       startActivity(openNewAccount); 

      } 
     }

来源

2012-06-07 user1172575

你期望填充什么值？请更具体一些。 – twaddington

感谢您的回答。这些值应该由用户输入。当用户输入他/她想要花费的金额和物品价格时，我期望结果是（金额 - 物品价格）。但即使getItemPrice（）和getUserAmountEntered（）方法打印用户输入的实际金额，它仍会将结果返回为零。 – user1172575

我没有看到你在这个Activity中调用这些方法的地方。你需要做的是在你的布局中创建一个提交'Button'并将一个'OnClickHandler'绑定到它。当你的'OnClick'方法被调用时，你可以从你的文本字段中读取值。您不能在另一个Activity上调用方法。另外，请使用'Log'类而不是'System.out.println'：http://developer.android.com/reference/android/util/Log.html – twaddington

是你只是想调用公共职能？这不会起作用，因为“典型”一次只有一个活动具有前景。您可以传递具有意图的值作为额外值，使用共享偏好，最极端的扩展应用程序并使用它来容纳所有数据。

来源

2012-06-07 20:30:51

谢谢！我使用附加功能，现在我的应用程序正常工作 – user1172575

在java中接收参数问题

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