如何检查选择了哪个radiogroup按钮？

Question

我在一个radiogroup中有三个单选按钮。我如何告诉Java根据所选按钮做不同的事情？我有组和所有的按钮声明：

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); 

我知道我会说这样的事情：

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

} else{ 

} 

但等于不正确的语法...我怎么能要求它的Java按钮被选中？

Answer 1

尝试：

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

Answer 2

因为getCheckedRadioButtonId()返回一个整数，你想比较单选按钮对象的整数。你应该比较small的ID（这是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; 

}