更新textview没有任何按钮

-1

我有2个edittext字段为空，我想当我在两个字段中键入数字第三个textview会自动得到2上面edittexts的划分。 所以没有按钮来计算，等更新textview没有任何按钮

事情是当我在任何领域的应用程序获取强制关闭输入一个数字。这里是我的代码和logcat：

amount.addTextChangedListener(new TextWatcher() { 

     public void afterTextChanged(Editable arg0) { 
     } 

     public void beforeTextChanged(CharSequence s, int start, int count, 
       int after) { 
     } 

     public void onTextChanged(CharSequence s, int start, int before, 
       int count) { 
      AddFuelActivity.this.updateValue(); 
     } 

    }); 

    litres.addTextChangedListener(new TextWatcher() { 

     public void afterTextChanged(Editable arg0) { 
     } 

     public void beforeTextChanged(CharSequence s, int start, int count, 
       int after) { 
     } 

     public void onTextChanged(CharSequence s, int start, int before, 
       int count) { 
      AddFuelActivity.this.updateValue(); 
     } 

    }); 


protected void updateValue() { 
    int amountInt = Integer.parseInt(amount.getText().toString()); 
    int litresInt = Integer.parseInt(litres.getText().toString()); 
    float priceFuelAuto = 0; 
    priceFuelAuto = amountInt/litresInt; 
    fuelPrice.setText("€ " + priceFuelAuto); 
}

logcat错误：我认为这些是重要的。

01-22 13:23:21.650: E/AndroidRuntime(671): java.lang.NumberFormatException: Invalid int: "" 
01-22 13:23:21.650: E/AndroidRuntime(671): at java.lang.Integer.invalidInt(Integer.java:138) 
01-22 13:23:21.650: E/AndroidRuntime(671): at java.lang.Integer.parseInt(Integer.java:359) 
01-22 13:23:21.650: E/AndroidRuntime(671): at java.lang.Integer.parseInt(Integer.java:332) 
01-22 13:23:21.650: E/AndroidRuntime(671): atcom.example.mycarfuel.AddFuelActivity.updateValue(AddFuelActivity.java:155) 
01-22 13:23:21.650: E/AndroidRuntime(671): atcom.example.mycarfuel.AddFuelActivity$2.onTextChanged(AddFuelActivity.java:67)

我修复了我的代码。这里是我做的：

public void onTextChanged(CharSequence s, int start, int before, 
      int count) { 
     if (litres.length() > 0) { 
      AddFuelActivity.this.updateValue(); 
     } 
    }

和

int amountInt = 0; 
    int litresInt = 0; 
    try { 
     amountInt = Integer.parseInt(amount.getText().toString()); 
     litresInt = Integer.parseInt(litres.getText().toString()); 
    } catch (NumberFormatException e) { 
     litresInt = 0; 
     amountInt = 0; 
    } 
    if(amountInt !=0 && litresInt != 0){ 
     float priceFuelAuto = 0; 
     priceFuelAuto = amountInt/litresInt; 
     fuelPrice.setText("€ " + priceFuelAuto); 
    }

感谢您的回复人

来源

2013-01-22 lantonis

其bcoz你试图比较一个不是有效整数的空字符串。 –

是的事情是，它只要输入一个数字就能捕获并拦截我的程序。那全是0。 – lantonis

@Override 
     public void onTextChanged(CharSequence s, int start, int before, 
       int count) { 
      // TODO Auto-generated method stub 
      if(edittext1.length()!=0){ 
      updateValue() 

      } 
      else{ 
       edittext2.setText(""); 
      }

来源

2013-01-22 11:31:48 kamal

只写了下面的代码..

amount.addTextChangedListener(new TextWatcher() { 

     public void afterTextChanged(Editable arg0) { 
     } 

     public void beforeTextChanged(CharSequence s, int start, int count, 
       int after) { 
     } 

     public void onTextChanged(CharSequence s, int start, int before, 
       int count) { 
      if(s.length()>0)  <<<<===Just put this condition 
      AddFuelActivity.this.updateValue(); 
     } 

    }); 

    litres.addTextChangedListener(new TextWatcher() { 

     public void afterTextChanged(Editable arg0) { 
     } 

     public void beforeTextChanged(CharSequence s, int start, int count, 
       int after) { 
     } 

     public void onTextChanged(CharSequence s, int start, int before, 
       int count) 
     { 
      if(s.length()>0)  <<<<===Just put this condition 
      AddFuelActivity.this.updateValue(); 
     } 

    }); 


protected void updateValue() { 
    int amountInt = Integer.parseInt(amount.getText().toString()); 
    int litresInt = Integer.parseInt(litres.getText().toString()); 
    float priceFuelAuto = 0; 
    priceFuelAuto = amountInt/litresInt; 
    fuelPrice.setText("€ " + priceFuelAuto); 
}

来源

2013-01-22 11:35:58

更新textview没有任何按钮

回答

相关问题