Android深入浅出之Binder机制

核心提示：I##INTERFACE::I##INTERFACE() { } \I##INTERFACE::~I##INTERFACE(){ } \很麻烦吧？尤其是宏看着头疼，赶紧兑现下吧，An

I##INTERFACE::I##INTERFACE() { } \
I##INTERFACE::~I##INTERFACE(){ } \
很麻烦吧？尤其是宏看着头疼。赶紧兑现下吧。
const
android::String16IServiceManager::descriptor(“android.os.IServiceManager”);
constandroid::String16& IServiceManager::getInterfaceDescriptor() const
{ return IServiceManager::descriptor;//返回上面那个android.os.IServiceManager
} android::sp<IServiceManager> IServiceManager::asInterface(
constandroid::sp<android::IBinder>& obj)
{
android::sp<IServiceManager>intr;
if (obj != NULL) {
intr = static_cast<IServiceManager*>(
obj->queryLocalInterface(IServiceManager::descriptor).get());
if (intr == NULL) {
intr = new BpServiceManager(obj);
}
}
return intr;
}
IServiceManager::IServiceManager () {}
IServiceManager::~ IServiceManager() { }
哇塞，asInterface是这么搞的啊，赶紧分析下吧，还是不知道interface_cast怎么把BpBinder*转成了IServiceManager
我们刚才解析过的interface_cast<IServiceManager>(new BpBinder(0)),
原来就是调用asInterface(new BpBinder(0))
android::sp<IServiceManager>IServiceManager::asInterface(
constandroid::sp<android::IBinder>& obj)
{
android::sp<IServiceManager>intr;
if (obj != NULL) {
....
intr = new BpServiceManager(obj);
//神呐，终于看到和IServiceManager相关的东西了，看来
//实际返回的是BpServiceManager(new BpBinder(0))；
}
}