Error:(30, 31) 错误: 找不到符号
符号:   类 KeyEventCompat

位置: 程序包 android.support.v4.view

解决：

KeyEventCompat类被取消了 hasNoModifiers方法已经被KeyEvent实现了

报错:

if (KeyEventCompat.hasNoModifiers(event)) {
    handled = arrowScroll(FOCUS_FORWARD);
} else if (KeyEventCompat.hasModifiers(event, KeyEvent.META_SHIFT_ON)) {
    handled = arrowScroll(FOCUS_BACKWARD);
}

改成:

if (event.hasNoModifiers()) {
    handled = arrowScroll(FOCUS_FORWARD);
} else if (event.hasModifiers(KeyEvent.META_SHIFT_ON)) {
    handled = arrowScroll(FOCUS_BACKWARD);
}