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

You can take the RadioGroup id which contains 3 radio buttons.

  RadioGroup radiogrp = (RadioGroup) findViewById(R.id.RadioGroup);
  int id = radiogrp.getCheckedRadioButtonId();

This will return the identifier of the selected radio button in this group. Upon empty selection, the returned value is -1.

So you can put if condition and check whether the id == -1 than no radio button is selected.

if (id == -1)
{
  // no radio buttons are checked
}
else
{
  // one of the radio buttons is checked
}