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Slow rendering on an orientation change when running app natively in iOS and Android

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  • Slow rendering on an orientation change when running app natively in iOS and Android

    I have deployed my app natively in both iOS and Android using PhoneGap Build. When I run my app natively, the List Control orientation change takes a very long time before it renders into an alternate view. I have a list control with about 300 rows. It has a free-form portrait and a columnar landscape layout. When using a mobile browser, it takes about 3-4 seconds to render the alternate columnar view after changing the orientation from portrait to landscape. When run natively on an iPhone or Android phone, it takes about 15 seconds for the columnar view to render. Everything else in my app seems to work fine in native mode.

    Does anyone have any ideas why the orientation change rendering would take so long?

    Thanks

  • #2
    Re: Slow rendering on an orientation change when running app natively in iOS and Android

    300 records should be no problem. The fact that there is even a 15 second delay is a bit much. Is it a complex query that the list is based on? Is the db server on the LAN or local to the web server? How are you filtering the data? Database type?

    Comment


    • #3
      Re: Slow rendering on an orientation change when running app natively in iOS and Android

      I get the data via a web service. The columnar layout uses the same data as the free-form layout. The columnar layout renders the 300 records in about 3-4 seconds when running in a browser, but when running as a native app, it takes 15 seconds. Both layouts (free-form and columnar) and both platforms (web browser and native app shell) access the data in the same exact way.

      Comment


      • #4
        Re: Slow rendering on an orientation change when running app natively in iOS and Android

        Maybe data caching going on in the browser? I don't know. Change your List control to Data Pagination and see if that makes any difference.

        Can you filter your data and get back a smaller sample to test with? 20, 50, 100, 200 records... see where the problem pops up.

        Code:
        The web view used by PhoneGap is the same web view used by the native operating system.   On iOS, this is the Objective-C UIWebView class; on Android, this is android.webkit.WebView.  Since there are differences in the web view rendering engines between operating systems, make sure that you account for this in your UI implementation.
        Given this, is the web view that Safari uses exactly the same as the native web view? If that were the case then shouldn't they perform the same? Doesn't help... just thinking out loud.

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        • #5
          Re: Slow rendering on an orientation change when running app natively in iOS and Android

          I'm not sure why I did not notice this until I created the PhoneGap app, but I am seeing the same behavior now when I launch the app from a web browser. It progressively gets slower each time I make an orientation change and it re-renders the list control. It seems like it adds about one second to the rendering time per landscape orientation change.

          I created a test case using a very simple UX component which contains a single list control with 2 layouts (a free-form portrait and a columnar landscape). The data is coming straight from a static list and there are 219 rows. I have it configured to switch layouts when there is an orientation change. The response time to render the landscape layout is very slow when I change the orientation the very first time (approx. 4 seconds). It progressively gets slower each time I make an orientation change. After about 10 orientation changes, the landscape layout takes about 10 seconds to render.

          I am using V12 build 1620. I will turn on the profiler and measure the Javascript execution times.

          Thanks

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          • #6
            Re: Slow rendering on an orientation change when running app natively in iOS and Android

            I haven't done a ton of testing but I may be finding the same results. I'm loading 240 images into a list. When first loaded it takes about 4 seconds for a full render on an orientation change. One Layout. After about 10 orientation changes I'm up to around 10 seconds. It doesn't take any longer after that. Now that you've got some static list data in a test case you can submit it to Alpha and get their opinion. I don't think it matters but I'm running in GardenWeb.

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            • #7
              Re: Slow rendering on an orientation change when running app natively in iOS and Android

              Thanks David. I already submitted it yesterday.

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              • #8
                Re: Slow rendering on an orientation change when running app natively in iOS and Android

                FYI - Selwyn said they were able to reproduce the problem and will be working on a solution soon.

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                • #9
                  Re: Slow rendering on an orientation change when running app natively in iOS and Android

                  Excellent.

                  Comment


                  • #10
                    Re: Slow rendering on an orientation change when running app natively in iOS and Android

                    Dave,

                    Not to hijack this thread... but what version of PhoneGap/Cordova are you using?

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                    • #11
                      Re: Slow rendering on an orientation change when running app natively in iOS and Android

                      As far as the Cordova goes, I have only done some preliminary testing with the API and Garden Web. I was using version 2.9 and I also tried built-in. My PhoneGap apps are not using the Cordova API at this time.

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                      • #12
                        Re: Slow rendering on an orientation change when running app natively in iOS and Android

                        Things in PhoneGap change really fast and change a lot. I can get Notifications working in 2.9.0 but not in 3.0.0 or 3.1.0. I've tried both Alpha functions and calling Notifications directly. Must be something in the config.xml file that is not set up properly.

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                        • #13
                          Re: Slow rendering on an orientation change when running app natively in iOS and Android

                          In tomorrow's build:

                          UX Component - List Control Performance - The way in which events are bound to List controls elements has been improved. This will result in a improvement in performance when doing an orientation change on the device and switching to a different List layout based on the orientation.

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