android: gson performance

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I am trying to use gson to do my object mapping on the android emulator.

It has been ridiculously slow when processing json data around 208 kb. I do not have any hierarchies in my json.

After the object mapping is done, i can see it that gson created around 500 records.

It is taking it over 3 minutes on the android emulator to map the input json.

I have annotated my entity which comprises of strings and couple of floats.

An I missing something?

Any ideas, best practices would greatly help.

Are there any ways of quickly object mapping the json data?

        URL myURL = new URL(url);
        /* Open a connection to that URL. */
        URLConnection ucon = myURL.openConnection();
        /*
         * Define InputStreams to read from the URLConnection.
         */
        InputStream is = ucon.getInputStream();
        InputStreamReader reader = new InputStreamReader(is);
        long tickCount = System.currentTimeMillis();
        Policy[] policies = new Gson().fromJson(reader, Policy[].class);
        long endCount = System.currentTimeMillis() - tickCount;
        Log.d("Time to pull policies in milliseconds", "" + endCount);
5 Answers

You'd probably get better performance if you wrapped that InputStream in a BufferedInputStream with a nice big buffer...

3 minutes is insane. I seldom run the emulator but I have an app with a ~1.1MB JSON asset and that takes around 5 seconds to load and process on hardware.

(Which is still far too long, but still).

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