How to check if a radiobutton is checked in a radiogroup in Android?

Question

I need to set validation that user must fill / select all details in a page. If any fields are empty wanna show Toast message to fill. Now I need set validation

Answer 1

I used the id's of my radiobuttons to compare with the id of the checkedRadioButton that I got using mRadioGroup.getCheckedRadioButtonId()

Here is my code:

mRadioButton1=(RadioButton)findViewById(R.id.first);
mRadioButton2=(RadioButton)findViewById(R.id.second);
mRadioButton3=(RadioButton)findViewById(R.id.third);
mRadioButton4=(RadioButton)findViewById(R.id.fourth);

mNextButton=(Button)findViewById(R.id.next_button);

mNextButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        int selectedId=mRadioGroup.getCheckedRadioButtonId();

        int n=0;
        if(selectedId==R.id.first){n=1;}

        else if(selectedId==R.id.second){n=2;}

        else if(selectedId==R.id.third){n=3;}

        else if(selectedId==R.id.fourth){n=4;}
        //. . . .
    }