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Ilya Grigorik has a great presentation about building mobile websites to take just “1,000 ms to Glass.” If your web page can load in 1 second, you win the human perception battle, and now you must wow your customers with great content. These studies have shown that users perceive delays of 0 – 100 ms as instantaneous and delays of 100 – 300 ms as sluggish delays between 300 – 1,000 ms indicate to users that “the machine is working,” whereas delays of 1,000+ ms lead users to feel a context switch.Īs this is basic human psychology, it seems to be a good metric to start with for page/view/app loading times. Saying “my app needs to load faster” is great, but what are the expectations of the end user, and are there concrete numbers you can apply to those expectations? In general, we can fall back on studies of the psychology of human interactions.
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Like all performance goals, it is important to understand the performance goals associated with UI.
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But how about UI performance? How does the UI that your designers designed (and you built) run? Do the pages load quickly? Do they respond in a fast and smooth way? In this chapter, we’ll discuss how to optimize your UI for fast rendering and scrolling/animations, and the tools you can use to profile your screen and UI performance. We’ve already (briefly) discussed the pitfalls of the many screen sizes in the Android ecosystem and the challenges that exist there. However simple (or complicated) the UI of your app is, it’s important that your UI design is built to be performant.Īs a developer, your task is to work with the UI/UX team and build an app that follows its design parameters on every Android device. As the UI of your app is your connection to your customers, it defines your brand and it requires careful planning. Use 20 MB for storage.ĪtMaxStorageSize(20 * 1024 * 1024L).thenAccept(new AppCenterConsumer() void accept(Boolean success) ().get().Ĭallback example: AppCenter.isEnabled().The user interface of your app is likely influenced by designers, developers, usability studies, and testing-just about anyone is happy to add input/feedback to how your app looks. For this reason, setMaxStorageSize must be called before your call to AppCenter.start(.). The API is asynchronous, and the callback is called when you start App Center services. You can use the setMaxStorageSize API to set the size of the local DB. If you expect to be paused for a long time, you can use a larger database size to store more events. It's also useful in conjunction with the pause and resume APIs.
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Large logs can take up a lot of space, so you may choose to limit the size of the local database. When using the App Center SDK, logs are stored locally on the device. You can get the version of App Center SDK that you're currently using. This method must only be used after AppCenter has been started, it will always return false before start. This API is asynchronous, you can read more about that in our App Center Asynchronous APIs guide. The following API is useful for debugging purposes. This identifier remains the same for a device when the app is updated and a new one is generated only when the app is re-installed or the user manually deletes all app data. The App Center SDK creates a UUID for each device once the app is installed. To have as many log messages as possible, use Log.Verbose. You can set the log level at any time you want. By default, it's set it to ASSERT for non-debuggable applications and WARN for debuggable applications. The log levels correspond to the ones defined in. Use the tLogLevel() API to enable additional logging while debugging. You can control the amount of log messages by App Center that show up in LogCat.