sendmessage Service的工作过程使用Android O(8.0) A(13)

Service有一个特性，多次绑定同一个Service时，Service的onBind方法只会执行一次，除非Service终止了。当Service的onBind方法执行以后，系统还会告知客户端已经成功连接Service了。sendmessage这个过程由publishService方法来实现

    public void publishService(IBinder token, Intent intent, IBinder service) {
        // Refuse possible leaked file descriptors
        if (intent != null && intent.hasFileDescriptors() == true) {
            throw new IllegalArgumentException("File descriptors passed in Intent");
        }

        synchronized(this) {
            if (!(token instanceof ServiceRecord)) {
                throw new IllegalArgumentException("Invalid service token");
            }
            mServices.publishServiceLocked((ServiceRecord)token, intent, service);
        }
    }

又调用##ActivityManagerService#publishServiceLocked

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