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Using default BaseLoaderCallback in an android service

asked 2013-06-05 12:47:11 -0500

variablexxx gravatar image

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I want to use OpenCV in an android service. In the OpenCV documentation I found the following information:

Default BaseLoaderCallback implementation treats application context as Activity and calls Activity.finish() method to exit in case of initialization failure. To override this behavior you need to override finish() method of BaseLoaderCallback class and implement your own finalization method.

But now I don't now how I should implement my own finalization method. What should I do in this method?

And another question: Where should I place the following line of code:

OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_4, this, mOpenCVCallBack)

In an android activity this line of code should be in the onResume(), but in an android service I don't an onResume() method.

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@variablexxx - Did you figure out how to do this?

Torcellite gravatar imageTorcellite ( 2013-07-02 11:46:51 -0500 )edit

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answered 2013-07-02 13:38:24 -0500

Torcellite gravatar image

updated 2013-07-02 22:26:32 -0500

Well, I seem to have figured it out.

You need to call initAsync in onStartCommand

if(OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_4, getApplicationContext(), mLoaderCallback)) {
        Log.i(TAG, "Loaded OpenCV");
    }
    else
        Log.i(TAG, "Couldn't load OpenCV");

Wait about 1.5 seconds before you use OpenCV libraries for them to be loaded. You could use a delayed runnable.

Also make sure you override the finish() function of the BaseLoaderCallback.

BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(
        WDMRService.this) {
    @Override
    public void onManagerConnected(int status) {
        switch (status) {
        case LoaderCallbackInterface.SUCCESS: {
            Log.i("", "OpenCV loaded successfully");
        }
            break;
        default: {
            super.onManagerConnected(status);
        }
            break;
        }
    }

    @Override
    public void finish() {
        // implementing own finish method since openCV treats context as
        // activity
    }
};

If you're not going to use OpenCV once the service is destroyed, you should unbind the OpenCV service in finish(). It will work even if you don't, but it is better if you do. I don't because I require OpenCV after the service is destroyed too.

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Asked: 2013-06-05 12:47:11 -0500

Seen: 1,920 times

Last updated: Jul 02 '13