Cannot resolve symbol KeyEventCompat（android.support.v4.view.KeyEventCompat找不到）
解决方案
KeyEventCompat类（我项目中用它的hasNoModifiers方法）最后查看源码 才知道这个hasNoModifiers方法已经被KeyEvent实现了。 贴出源码：

public boolean executeKeyEvent(KeyEvent event) {//报错地方 // The focus finder had a bug handling FOCUS_FORWARD and FOCUS_BACKWARD // before Android 3.0. Ignore the tab key on those devices.// if (KeyEventCompat.hasNoModifiers(event)) {// handled = arrowScroll(FOCUS_FORWARD);// } else if (KeyEventCompat.hasModifiers(event, KeyEvent.META_SHIFT_ON)) {// handled = arrowScroll(FOCUS_BACKWARD);// }// http://blog.csdn.net/lrpshuai/article/details/78392872//正确代码 if (event.hasNoModifiers()) { handled = arrowScroll(FOCUS_FORWARD); } else if (event.hasModifiers(KeyEvent.META_SHIFT_ON)) { handled = arrowScroll(FOCUS_BACKWARD); }}