What is the principle and function of Intent in Android? What types of parameters can be passed?

Answer: Intent is the messenger connecting the four major components of Activity, Service, BroadcastReceiver, and ContentProvider. It can pass eight basic data types as well as string, Bundle types, and types that implement Serializable or Parcelable.

Intent can be divided into explicit intention and implicit intention.

Explicit intent: Calling the Intent.setComponent() or Intent.setClass() method clearly specifies the Intent of the component name as an explicit intent. The explicit intent clearly specifies which component the Intent should be passed to.

Implicit intent: An Intent that does not explicitly specify a component name is an implicit intent. The Android system will find the most appropriate component to handle this intent based on the action, category, and data (URI and data type) set in the implicit intent.