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They even run each media player instance in different threads to minimize interference between one another The TikTok team created a pool of media player instances throughout the application to neatly provide for various media contents. To further improve the speed of video playback, it is good practice to provide different media player instances for different codecs.
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Android provides the MediaCodec class to help access the underlying codec. Better video playback experience: reuse resourcesTikTok users can create audio and video content in various ways, and different codecs are used to play different types of content. TikTok's approach was to use allocation algorithms to distribute tasks into different frames to ensure that the application has a steady frame rate.ģ. Trying to fit too much work in a single frame will inevitably cause a jank. In many cases, TikTok used doFrame() to perform frame-by-frame tasks. The layout boundaries of each View are clearly visible in the inspector, so the team can easily simplify the View hierarchy of the interface and reduce excessive and unnecessary content drawing. The TikTok team used the Layout Inspector in Android Studio to pinpoint the unnecessary layout contents. Smoother user interfaceTo ensure a smoother user interface, the team needed to tackle two challenges: 1) simplify the View hierarchy, so that the app only renders what is necessary on screen, and 2) reduce the number of task executions in each frame so that the app can have a steady frame rate.
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TikTok used Simpleperf to analyze the code execution time, and Android Studio's Profiler to monitor the usage of resources such as memory, CPU, and network to optimize I/O, threads, and resource locks.Ģ. In order to further reduce the execution time of creating Views on the main thread, the team even used a background thread to load View components asynchronously, thus improving the overall speed of app startup. The team studied the App Startup library in depth and refactored the app's startup framework to achieve on-demand loading and meticulous scheduling of components. The App Startup library is an Android Jetpack library to help developers initialize app components simply and efficiently. Making sure the app startup time is no longer than the Android Vital’s recommendation is the best way to ensure the app loads and starts responding to user activity as quickly as possible. Faster startup: refactor startup framework App startup time is one of the metrics in Android Vitals.
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They also discussed how to measure the effects of performance optimization to prevent the occurrence of regression.ġ. Reducing app startup time, a smoother user experience with reduced jank and better video playback experience were three major goals that the team prioritized.
To solve these issues, the TikTok team looked to Android tools to start their app improvement journey.
The engineering team identified three reasons that slowed down the app : janky frames, video playback lag, and network issues. But a rapid increase in functionality sometimes leads to an upsurge in technical requirements. TikTok is constantly introducing new features. To avoid issues like these, the TikTok team continuously tracks the overall app performance through ongoing data monitoring, peer benchmarks, and user surveys. If the app is slow to load, or playback gets stuck, users will feel frustrated and might abandon the app altogether. All users want a smooth, responsive app experience, no matter which device they use. TikTok is one of the most popular community-driven entertainment platforms with 1 billion people across the globe publishing and browsing video content every day.Ī diverse user base naturally means diverse network bandwidth conditions and devices with different screen sizes, available memory and processing power. If you want to learn how the TikTok team improved their app experience to achieve better business performance, please read our business article here. TikTok's team was able to significantly improve their overall performance by following Android’s performance guidance, and employing their deep understanding of development tools such as Android Gradle Plugin and Jetpack libraries. Ensuring an excellent app experience in all these scenarios is paramount. Other users are using entry level devices with limited memory and storage. With users around the world, it’s inevitable that some of them experience network issues such as slow, intermittent, or expensive connectivity. TikTok serves a wide range of user groups. Posted by The Android Developer Relations team Stay tuned for more programs helping small games companies grow on Google Play. Didn’t make it? If you missed the event or would like to explore further, you can still log in to the virtual world and discover more about the finalists.
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