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Android Plugin - Direct binding from C# to Java ?

Discussion in 'Android' started by hello1111, Nov 4, 2014.

  1. hello1111

    hello1111

    Joined:
    Apr 14, 2014
    Posts:
    13
    Hi All -
    apologies in advance if this is old territory.
    I've read Building Plugins For Android and googled around,
    and from what I can see, the stack for getting to java from C# is: C# <---> C/C++ <---> Java,
    whether you're using "Java Plugins" or not.

    Is that the case ?

    Xamarin claims to bind directly from C# to Java, but who knows what's under the hood.

    My concern is performance.
    Our Java endpoints have their own trips into C/C++,
    so we'd be crossing the JNI 2 times in one direction for stuff,
    and we'd be doing that on the order of 30 times per second from C# --> Java, and also 30 times per second from Java --> C#, so if we can skip some JNI excursions that would be great.

    cheers and TIA,
    Orion
     
    hello1111, Nov 4, 2014
    #1

  2. Yury-Habets

    Yury-Habets

    Unity Technologies

    Joined:
    Nov 18, 2013
    Posts:
    1,165
    This is correct.

    You can try calling native methods directly from C# code:
    Using Your Plugin from C section in http://docs.unity3d.com/Manual/PluginsForAndroid.html
    But you will need to extract these calls from Java if you want to avoid JNI.
     
    Yury-Habets, Nov 5, 2014
    #2

  3. hello1111

    hello1111

    Joined:
    Apr 14, 2014
    Posts:
    13
    Hi Yuri - thanks for the reply, I appreciate it.

    We have a bunch of functionality in Java, and also need to access underlying OS features (notably bluetooth),
    so it sounds unavoidable to visit the JNI.
     
    hello1111, Nov 5, 2014
    #3