如何检查选择了哪个radiogroup按钮？

Question

我在一个放射组中有三个radiobuttons。如何根据选择的按钮告诉Java做不同的事情？我有组和所有按钮声明：

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);

我知道我会这样说：

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

} else{

}

但是equals不是正确的语法...我怎么能问java选择了哪个按钮？

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，所以你试图将一个整数与RadioButton对象进行比较。您应该比较small（R.id.RBS）和getCheckedRadioButtonId()的ID：

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;

}