Android: What is Binder Thread?

Question

I use Debug.startMethodTracing for my purposes and in the output file I can see(I don\'t use IPC):

8   Binder Thread #2
7   Binder Thread #1

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Answer 1

Binder thread represents a separate thread of your service. Binder is a mechanism that provides Inter Process Communication.

Let's consider an example. Imagine that you have service Process B (see picture). And you have several applications that communicate with this service B (one of this application is, for instance, Process A). Thus, one service B should provide different results simultaneously to different applications. Thus, you need to run several replicas of Service B for different applications. Android runs these replicas in different threads of the Process B and these threads are called "Binder Thread #N".

I took the picture here, where you can also read what Binder is.