android NumberPicker 数组越界的坑

private void initViews() {
wheel = (NumberPicker) findViewById(R.id.info_wheel_province);
wheelCity = (NumberPicker) findViewById(R.id.info_wheel_city);
wheelCity.setWrapSelectorWheel(false);

//读取地址信息json
final List<CityBean> cityBeans = ResUtils.initCityList(this);
final String[] pros = new String[cityBeans.size()];

for (int i = 0; i < pros.length; i++) {
pros[i] = cityBeans.get(i).getProvince();
}

//        wheel.setDescendantFocusability(NumberPicker.FOCUS_BLOCK_DESCENDANTS);
//        wheelCity.setDescendantFocusability(NumberPicker.FOCUS_BLOCK_DESCENDANTS);
wheel.setMaxValue(pros.length - 1);
wheel.setMinValue(0);
wheel.setWrapSelectorWheel(false);
wheel.setDisplayedValues(pros);
wheel.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {

@Override
public void onValueChange(NumberPicker picker, int oldVal, final int newVal) {
String citys = cityBeans.get(newVal).getCitys();
final String[] split = citys.split(",");
wheelCity.setMinValue(0);
wheelCity.setValue(0);
if (split.length - 1 > wheelCity.getMaxValue()) {
wheelCity.setDisplayedValues(split);
wheelCity.setMaxValue(split.length - 1);
} else {
wheelCity.setMaxValue(split.length - 1);
wheelCity.setDisplayedValues(split);
}
wheelCity.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {

@Override
public void onValueChange(NumberPicker picker2, int oldVal2, int newVal2) {
Toast.makeText(InfoActivity.this, pros[newVal] + " " + split[newVal2], Toast.LENGTH_LONG).show();
}
});
}
});
}