Using the native interface

[jam...@fastlaneinnovations.com]

I'm having trouble understanding how to fully use the native interface. I have the interface defined with some methods, and am implementing code in the native stubs to carry out the methods, but I need information to pass both ways. I'm working on the Bluetooth LE functionality, and it uses some callbacks to respond to data that gets received from a peripheral device.

It's unknown when this will occur, so the callback is called by the Bluetooth adapter when this happens and the data is then stored in a class field of the native class. How do I get the main CN1 program to know when the callback inside the native code has been triggered? I can't pass a reference to the native class from other CN1 non-native objects (can I?), do I somehow assign some listener to some invisible text field or something like that?

In general, I can see that it's easy for the CN1 code to call the native interfaces that I set up, but how do I go the other way and have the native code cause something to happen in the CN1 code?

[David Wafula]

If your native source is Android, declare a static object  in a  CN1 class and use it as hook to call CN1 code directly from your native side.

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David Wafula

[jam...@fastlaneinnovations.com]

Ok, that should be easy for the Android case. What should I do for iOS though?

[Shai Almog]

As usual, slightly more complex http://www.codenameone.com/blog/native-ios-code-callbacks

[Tim Gaul]

David, do you have a "best way" to watch these static objects for changes, in Java?

On Sunday, November 2, 2014 12:25:46 AM UTC+2, davidwaf wrote:

If your native source is Android, declare a static object  in a  CN1 class and use it as hook to call CN1 code directly from your native side.

On Sun, Nov 2, 2014 at 12:15 AM, <jam...@fastlaneinnovations.com> wrote:

I'm having trouble understanding how to fully use the native interface. I have the interface defined with some methods, and am implementing code in the native stubs to carry out the methods, but I need information to pass both ways. I'm working on the Bluetooth LE functionality, and it uses some callbacks to respond to data that gets received from a peripheral device.

It's unknown when this will occur, so the callback is called by the Bluetooth adapter when this happens and the data is then stored in a class field of the native class. How do I get the main CN1 program to know when the callback inside the native code has been triggered? I can't pass a reference to the native class from other CN1 non-native objects (can I?), do I somehow assign some listener to some invisible text field or something like that?

In general, I can see that it's easy for the CN1 code to call the native interfaces that I set up, but how do I go the other way and have the native code cause something to happen in the CN1 code?

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David Wafula

[David Wafula]

Nothing very special as far as i know. Usually i have a dedicated class in CN1 that exposes the functionally i need to access from native. Then say if my main class in CN1 is MyApp,  i would  instantiate the dedicated class in the init() of MyApp, and make it public static.

So from native, I would simply do:

MyApp.theobjectExposingCN1Functionality.theMethod()

So, in effect, CN1 is not really watching/listening for changes in native, rather native is simply calling CN1 as per need - sort of pushing info into CN1.

 

There could  other ways of doing this of course.

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David Wafula

[Steve Hannah]

If you haven't already, you should check out the CN1Sockets library as a reference.  I needed to support callbacks to handle reading from sockets.  I used the strategy mentioned here:  Use a static method, and call it from native code.

https://github.com/shannah/CN1Sockets

Steve

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Steve Hannah

Web Lite Solutions Corp.

[jam...@fastlaneinnovations.com]

OK, I'm starting to see how it works in your Sockets lib. You can call the static methods from each native language, I wasn't sure about being able to do that with non-Java, but I see how you've done it in the iOS code.

So I think for handling the BLE callback, when data is received and the callback is invoked in native code, I'll have it invoke a static CN1 method, passing the data as an argument, and then I can have the CN1 method also revalidate the GUI. I just have to see if the iOS BLE implementation uses a similar approach.

Since we're talking about native code and CN1LIBs, to create one it looks like I just make a class that has methods that match up to the Native Interface I define, then I just implement the native code by adding to the stubs. I do this all in NetBeans, and I recall reading in the blog or something that I need to do a build with special targets and other things. Is there anywhere I can find a list of the things I need to do to build the CN1LIB?