radio group setOnCheckedChangeListener

 radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener()    {        public void onCheckedChanged(RadioGroup group, int checkedId) {            // checkedId is the RadioButton selected            RadioButton rb=(RadioButton)findViewById(checkedId);            Toast.makeText(getApplicationContext(), rb.getText(), Toast.LENGTH_SHORT).show();        }    });

RadioGroup yourRadioGroup = (RadioGroup) findViewById(R.id.radioGroup1);        yourRadioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener()        {            @Override            public void onCheckedChanged(RadioGroup group, int checkedId)            {                switch(checkedId)                {                case R.id.radio0:                    // TODO Something                    break;                case R.id.radio1:                    // TODO Something                    break;                case R.id.radio2:                    // TODO Something                    break;                }            }        });

Or, if you prefer:

yourRadioGroupName.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener()        {            @Override            public void onCheckedChanged(RadioGroup group, int checkedId)            {                int idRadioButtonChosen = yourRadioGroupName.getCheckedRadioButtonId();                if(idRadioButtonChosen > 0){                    radioButtonChosen = (RadioButton) findViewById(idRadioButtonChosen);                    textViewOnclick.setText(radioButtonChosen.getText());                }            }        });

The thing is that your radio buttons trying to refer the onRadioButtonClicked method in your main activity. But you didnt specify that method. Remember, if you're using android:onClick you should not use setOnCheckedChangeListener in your Main activity and vice versa.