如何用property控制inputreader中拦截相应的virtual key

如何在inputreader中拦截相应的virtual key


#include
void TouchInputMapper::dispatchVirtualKey(nsecs_t when, uint32_t policyFlags,
        int32_t keyEventAction, int32_t keyEventFlags) {
    int32_t keyCode = mCurrentVirtualKey.keyCode;
    int32_t scanCode = mCurrentVirtualKey.scanCode;
    nsecs_t downTime = mCurrentVirtualKey.downTime;
    int32_t metaState = mContext->getGlobalMetaState();
int32_t x=0;
    policyFlags |= POLICY_FLAG_VIRTUAL;


    NotifyKeyArgs args(when, getDeviceId(), AINPUT_SOURCE_KEYBOARD, policyFlags,
            keyEventAction, keyEventFlags, keyCode, scanCode, metaState, downTime);


char value[256];
if(property_get("persist.cancel.key", value, "0")==0)//这个prperty并没有被设置，如果property被设置成home则get的返回值是4，是按照property的字符数来的
getListener()->notifyKey(&args);
if(strspn(value,"home")!=0)
        {
        ALOGE("matt-   if(strspn0) ");
        if ( keyCode!= 3) 
          {
ALOGE("matt-  if ( keyCode!= 82) ");//keycode这个东西是从keycodes.h里得到的
getListener()->notifyKey(&args);
          }
        }
if(strspn(value,"back")!=0)
{
ALOGE("matt-   if(strspn1) ");
if ( keyCode!= 4) 

getListener()->notifyKey(&args);
}
if(strspn(value,"menu")!=0)
        {
        ALOGE("matt-   if(strspn2) ");
         if ( keyCode!= 82) 

getListener()->notifyKey(&args);
        }
    
}