One of the drawbacks of current Wear OS smartwatches is that they need to be charged every day or two. At last year's Google I O conference, Google and Samsung collaborated to create the Watch Face Format for Wear OS 4, known as WFF, which is not only easier to use, but also has power-saving technology that allows smartwatches to last longer.
Many developers are still using older Jetpack or Wearable Support databases when authoring surfaces; Google hopes that developers will use the new WFF to make Wear OS watch faces, and take advantage of the new technology to improve the battery life of the watch. If developers don't switch to WFF, their surface will only be able to display simple information such as battery remaining, program shortcuts, number of unread notifications, and date and time. The new format is declarative XML, which basically means that there is no logic or executable program, and the heavy lifting will be handled by Wear OS, giving developers the freedom to create surfaces without having to think about how to improve the program.
According to Google, the new format WFF is low maintenance and requires fewer updates, but some developers have complained that it doesn't handle complex features or animations well, as if Google wants to make the Wear OS exterior design cleaner. As can be seen from the previously concluded MWC 2024 release of new Wear OS watches, such as the OnePlus Watch 2, Google is actively promoting the WFF format, and in the Wear OS 4 system version, the surface can run smoothly on a low-power coprocessor without having to use a more power-hungry main processor, which helps a lot to provide longer battery life for Wear OS watches.
Data & ***androidcentral