During the development of the Android application, the interaction often occurs frequently between the internal application and applications. So the following aspects which include the application interaction pattern, return path, transmission medium and task stack, etc., are studied to improve the system efficiency of the application. Intent components are an interactive medium between applications. Firstly, we make a detailed description for the main attributes, two ways of starting the target component by explicit Intent and implicit Intent. And then we provide a specific implementation code. It is helpful to improve the efficiency of interaction by choosing different Intent startup modes under the interaction between different applications. On the return path of Activity, this paper puts forward two modes and solutions for the return of task stack and TaskStackBuilder object management. As a consequence, the problems of sequential return path or special path are resolved, which has been verified on multiple types of devices.