What:理解Intent filter

1.It, in effect, filters in intents of a desired type, while filtering out unwanted intents — but only unwanted implicit intents (those that don"t namea target class). An explicit intent is always delivered to its target, no matter what it contains; the filter is not consulted. But an implicit intent is delivered to a component only if it can pass through one of the component"s filters.(即filter只对没有指名目的的Intent进行过滤，广播？)1.It, in effect, filters in intents of a desired t