How to implement interprocess communication in Android?

In Android, there are several ways to achieve interprocess communication: using shared files, where data is written to a shared file in one process and then read from that file in another process to retrieve the data.

For instance, in the writing process, use FileOutputStream to write data to a shared file, and then in the reading process, use FileInputStream to read that file. Another option is to use shared preferences settings: Android provides the SharedPreferences class for sharing data across processes. One process can write data to SharedPreferences, and another process can read the SharedPreferences to retrieve the data. ContentProvider can also be utilized in different applications to share data. It allows inserting data into a database in one process and querying that database in another process. Messenger is a lightweight inter-process communication mechanism that uses Handler and Message to facilitate communication between processes. By creating a Messenger object in one process and passing it to another process, the latter can send and receive messages using that Messenger object. AIDL (Android Interface Definition Language) is a process communication mechanism specifically for Android. By defining an AIDL interface, data can be passed between different processes and methods can be called. These are some common ways for multiple processes communication on Android; the appropriate method can be chosen based on specific needs.