Android 4.4 如何设置物理键盘不可用

代码路径：
frameworks/base/services/java/com/android/server/wm/WindowManagerService.java
在/WindowManagerService.java文件中computeScreenConfigurationLocked方法中hardKeyboardAvailable设置false表示物理键盘不可用

boolean hardKeyboardAvailable = false;//config.keyboard != Configuration.KEYBOARD_NOKEYS;