Intents Simple Low Overhead IPC

The Android system uses Intent objects to enable applications to specify an Activity or Service. Intent objects also deliver data from one application to another, providing a simple and convenient form of IPC.

The Intent class, the Activity class, and Android's Intent-based inter-process communication solve one of the user interface problems of smartphone platforms that support multiple separate applications: they feel like a collection of separate programs. You don't have the simplicity of navigating a hierarchical user interface, as in simpler feature phones, and you don't have multiple windows, as on a PC user interface. The way Activities work together on Android makes it possible to make a seamless user interface out of multiple applications, and inter-process communication can enhance cooperation among applications.

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