我如何知道在Android Studio中选择了哪个单选按钮

Question

i have 3 radio buttons and once i click any one of them it should update 2 text views. One text view for the name and other text view for the price. When i click on the radio button the name gets updated but i am facing issue with how to get the item price from the array. Each of the radio button has different pricing.

Code:

     pizzaSizeRadioGroup = (RadioGroup) findViewById(R.id.radioGroup);
        pizzaSizeRadioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
//                Radio button checked
                sizeSelect = (RadioButton) findViewById(checkedId);
                selectedSize.setText(sizeSelect.getTag().toString());

//                how to display the price from array
                sizePrice = array_price_list[].getItem_price();
                totalPriceDisplay.setText(sizePrice);

            }
        });

Answer 1

you can implement switch Radiogroup checkedId

pizzaSizeRadioGroup = (RadioGroup) findViewById(R.id.radioGroup);

    pizzaSizeRadioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() 
    {
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            switch(checkedId){
                case R.id.radio0://Radio button id
                    // do operations specific to this selection
                    break;
                case R.id.radio1://Radio button id
                    // do operations specific to this selection
                    break;
                case R.id.radio2://Radio button id
                    // do operations specific to this selection
                    break;
            }   
        }
    });

or check the selected radio button

     int selectedId = pizzaSizeRadioGroup.getCheckedRadioButtonId();

Answer 2

It is not totally clear what is the values in the price array you have or what is the implementation of your getItem_price() method.

But it seems that you have set the name in the tag of the radio buttons and that is why you are able to get it and populate your selectedSize textview.

As much as i understand your problem, you could follow two approaches

Approach 1 : create a list of a pizza object with name and price and an id. Set the id in the tag of the radio button. that way you can get the name and price both using the id you will get form radioButton.getTag().

Approach 2: Concatenate the name and price with a |, eg, size1|25 and set that to the tag of radio button. Then you can use split on getTag to get the name and price both.

Hope this helps you with your problem.

Answer 3

for this purpose you can use switch please follow this

radiobuttoncheck.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() 
{
    public void onCheckedChanged(RadioGroup rgroup, int r_id) {
        switch(r_id){
            case R.id.rbid1:
                //show toast here to get idea
                break;
            case R.id.rbid2:

               //show toast here to get idea

                break;
        }   
    }
});