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#Android studio preview timed while rendering androidThe Android system can automatically reduce simple cases of overdraw, but it’s worth noting that this doesn’t extend to complex custom views where Android doesn’t have an insight into how you’re drawing your content. All of these things can cause significant overdraw. You should also look for areas where the background attribute is set to white, even though a parent has already painted a white background. ![]() Once you’ve identified an area of significant overdraw, the easiest way to reduce this overdraw is to open your app’s XML files and look for any areas of overlap, particularly any drawables that aren’t visible to the user, and any backgrounds that are being drawn on top of one another. You’ll definitely want to find out what’s causing any dark red areas. This pixel was painted 5 times, or possibly even more. Depending on your app, small areas of light red may be unavoidable, but if you see medium or large areas of red then you should investigate what’s causing so much overdraw. As a general rule, you should aim for a maximum overdraw of 2x. This means the pixel was only painted once. The only thing left to do is launch the app you want to test and see what the overdraw situation is. This tool uses blocks of color to highlight the different amounts of overdraw. Then, to check the amount of overdraw, simply open your device’s Settings, select Developer Options, and tap Debug GPU Overdraw followed by Show overdraw areas. ![]() Since this feature lives on your device, the first step is installing the app you want to test on your Android device. The good news is that your Android device already has a built-in feature that lets you check the amount of overdraw in any app installed on your device. For these reasons, when you’re testing your app for performance problems, overdraw is a sensible place to start. Large amounts of overdraw can indicate an underlying problem with your app’s user interface, such as redundant views-more on that later. It’s relatively easy to check your app for overdraw. Too much overdraw, however, can have a noticeable impact on your app’s performance so you’ll want to minimize overdraw wherever possible. Some overdraw, as in the example above, is inevitable. This means that some pixels are colored in twice, which is overdraw. Android doesn’t just paint the areas of blue that are visible to the user, it paints the entire blue background and then draws the text on top. One of the most common causes of a laggy, unresponsive user interface is overdraw. Overdraw is where you waste GPU processing time by coloring in pixels that only get colored in again by something else.įor example, imagine a blue background with some text across it. You also need to ensure your user interface renders quickly and runs smoothly. Your app’s user interface is your connection to the user, but creating something that looks nice is only half the battle. #Android studio preview timed while rendering how toOnce you have this information, you’ll have a better understanding of how to perfect your app’s performance and ultimately create an app that people will love using. ![]() So along the way we’ll also look at how to use the Android SDK tools to gather more information about whatever performance problems you uncover. If you do discover a performance problem in your app, obviously you’ll want to fix it. You’ll learn how to test whether these problems are occurring in your own projects, using the tools provided by the Android SDK-plus one tool that’s already installed on your Android device. In this article, you’ll get a crash course in the common performance problems every Android developer needs to be aware of. That is, until the negative Google Play reviews start rolling in. Performance is very important, but it’s also something that’s easy to forget about when you’re busy putting the finishing touches to your beautiful user interface or coming up with new and exciting features for your app. No matter how innovative and useful your Android app is, if it’s laggy, prone to freezing, or hogs memory, no one is going to want to use it. ![]()
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