oneway in *.aidl

最新推荐文章于 2025-12-05 17:02:52 发布

原创最新推荐文章于 2025-12-05 17:02:52 发布 · 937 阅读

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#methods #java

本文解释了Binder IPC中one-way关键字的作用：在不同进程间调用时，调用方不会等待被调用方处理完成；在同一进程中，则为同步调用。此外，所有方法必须声明为无返回值。

The oneway keyword means that if that call results in an IPC (i.e. the caller and callee are in different processes) then the calling process will not wait for the called process to handle the IPC. If it does not result in an IPC (i.e. they're both in the same process), the call will be synchronous. It's an unfortunate detail that simplifies the implementation of binder IPC a lot. If they're in the same process, the call is just a regular java method call.

It means methods must all have void return value (return nothing).

明白这些后，还要在 frameworks/base/Android.mk加上这个aidl文件，才能mmm过去。