how to increase speed of my application?

My applications requirement is to contact the webservice, get the xml, parse it and display it using a listfield. I am call开发者_如何学Pythoning all this classes xmlhandler, objectmodel, displaying it using a lisfield from a class that extends mainscreen which is making my application slow.

Can anyone suggest me how to make it fast?

Is it a apt to popup a loading screen and start a thread for contacting the webservice, get the xml, parsing it and kill the thread, then populate the listscreen and display it?

suggestions of any kind is welcome!

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Test the speed of every part of your program. What I usually use is System.nanoTime() and find the difference in time after every part of the program.

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Find out which part is slow before you do anything else. Otherwise, you'll waste a lot of your time on the wrong parts.

For doing this kind of timing work, I often will do internal logging into a StringBuilder, or maybe just into an ArrayList holding raw, unformatted data. After the test is over, I format and output the data. This minimizes the effect of the logging on the timings.

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I can only gues so forgive me if I'm wrong - to me it seems more efficient to create the item of list field only when they're really viewed. So I'd try to keep in memory only the parsed strings and create only the UI items currently to be displayed, discard invisible. To make it more smooth you can you can extend it one or more pages before and after current page.

This way the number of displayed items is always constant. You may also add paging to the service layer to limit number of records trabsmitted at once.