有時需要在RadioGroup中動態新增RadioButton

1.如果不做設定，那麼RadioButton之間就會貼在一起，動態設定margin

2.必須給RadioButton新增ID，否則預設選中的選項會一直是選中狀態

        RadioGroup rg= (RadioGroup) view.findViewById(R.id.rg_layout_radioButton);//橫向
        for (int i = 0; i < mTextArray.length; i++) {
            //radioButton
            RadioButton radioButton = new RadioButton(context);
            int dimension = (int) (getResources().getDimension(R.dimen.qb_px_10)+0.5f);//會自動轉化為畫素值
            radioButton.setPadding(dimension,0,0,0);
            radioButton.setButtonDrawable(R.drawable.selector_icon_31_32);
            radioButton.setText(mTextArray[i]);
            radioButton.setTextColor(getResources().getColor(R.color.white));
            //必須有ID，否則預設選中的選項會一直是選中狀態
            radioButton.setId(i);
            if (i==mTextArray.length-1){
                //預設選中
                radioButton.setChecked(true);
            }

            //layoutParams 設定margin值
            RadioGroup.LayoutParams layoutParams = new RadioGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT);
            if (i!=0){
                int i1 = (int) (getResources().getDimension(R.dimen.qb_px_40) + 0.5f);
                layoutParams.setMargins(i1,0,0,0);
            }else {
                layoutParams.setMargins(0,0,0,0);
            }
            //注意這裡addView()裡傳入layoutParams
            rg.addView(radioButton,layoutParams);
        }