How to check only one RadioButton check by default (Note)

RadioGroup radioGroup = new RadioGroup(this);
    RadioButton radioBtn1 = new RadioButton(this);
    RadioButton radioBtn2 = new RadioButton(this);
    RadioButton radioBtn3 = new RadioButton(this);

    radioBtn1.setText("hoge");
    radioBtn2.setText("huga");
    radioBtn3.setText("piyo");


    radioGroup.addView(radioBtn1);
    radioGroup.addView(radioBtn2);
    radioGroup.addView(radioBtn3);
	
	//Without this one line, the check will not move even if the others are in the checked state
    radioGroup.check(radioBtn1.getId());
 

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