根据数据动态创建radiobutton，默认选中第一个，并随点击切换碎片

private void initRadioGroup() {
    for (int i = 0; i < list.size(); i++) {

        RadioButton temp = new RadioButton(this);
        temp.setBackgroundResource(R.drawable.bg_rb_write_diary);
        temp.setButtonDrawable(android.R.color.transparent);//隐藏单选圆形按钮
        temp.setGravity(Gravity.CENTER);
        temp.setPadding(0, 30, 0, 30);
        temp.setText(list.get(i));
        temp.setId(i);
        temp.setTextSize(UtilUnitConversion.px2dp(this, 30));
        rg_write_diary.addView(temp, LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
    }
    rg_write_diary.check(0);
    rg_write_diary.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup group, @IdRes int checkedId) {
            index = checkedId;
            if (currentTabIndex != index) {
                FragmentTransaction trx = getSupportFragmentManager().beginTransaction();
                trx.hide(fragments[currentTabIndex]);
                if (!fragments[index].isAdded()) {
                    trx.add(R.id.fl_write_diary, fragments[index]);
                }
                trx.show(fragments[index]).commit();
            }
            currentTabIndex = index;


        }

    });

}