java - 如何检查选择了哪个单选按钮？

Question

我在一个单选组中有三个单选按钮。如何根据选择的按钮告诉 Java 做不同的事情？我声明了组和所有按钮：

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，所以您试图将整数与 RadioButton 对象进行比较。您应该比较small( 是R.id.RBS) 和的 id 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;

}