如何檢查選擇了哪個radiogroup按鈕？

Question

我在一個radiogroup中有三個單選按鈕。我如何告訴Java根據所選按鈕做不同的事情？我有組和所有的按鈕聲明：

final RadioGroup size = (RadioGroup)findViewById(R.id.RGSize); 
     final RadioButton small = (RadioButton)findViewById(R.id.RBS); 
     final RadioButton medium = (RadioButton)findViewById(R.id.RBM); 
     final RadioButton large = (RadioButton)findViewById(R.id.RBL); 

我知道我會說這樣的事情：

if (size.getCheckedRadioButtonId().equals(small){ 

} else{ 

} 

但等於不正確的語法...我怎麼能要求它的Java按鈕被選中？

Answer 1

嘗試：

if (size.getCheckedRadioButtonId() == small.getId()){ 
.... 
} 
else if(size.getCheckedRadioButtonId() == medium.getId()){ 
.... 
} 

Answer 2

因爲getCheckedRadioButtonId()返回一個整數，你想比較單選按鈕對象的整數。你應該比較small的ID（這是R.id.RBS）和getCheckedRadioButtonId()：

switch(size.getCheckedRadioButtonId()){ 
    case R.id.RBS: //your code goes here.. 
        break; 
    case R.id.RBM: //your code goes here.. 
        break; 
    case R.id.RBL: //your code goes here.. 
        break; 
} 

Answer 3

int selected = size.getCheckedRadioButtonId(); 

switch(selected){ 
case R.id.RBS: 
    break; 
case R.id.RBM: 
    break; 
case R.id.RBL: 
    break; 

}