Android 11 second developer preview: support hinge angle detection of folding machine

March 19 news, according to foreign media reports, almost a month after the release of the first developer preview version of Android 11, Google released the second version. Android 11 DP2 is a developer preview version, not a public beta version, so it does not include the various Android 11 features that people expect, but this version also has something to discuss, such as support for foldable device hinge angle detection.

Most notable is an API (application programming interface) that allows a foldable device to tell the application what bending angle its hinge is at. In other words, if devices such as Microsoft's upcoming Surface Duo use the latest Android system, they are expected to become easier to adjust the screen state. Broadly speaking, the ability of Android devices to display different content based on the bending angle of the hinge is becoming a more important feature, which should be handled at the system level. Other devices such as Samsung's Z Flip and Galaxy Fold will also benefit.

Google has also added an enhanced harassing call interception API, which enables applications to report the reason for rejecting calls and also to determine whether the calling number is from the user's address book. It also adds a way for applications to check the status of 5G networks, which essentially adds a switch to the bandwidth estimator. It allows applications to display 5G icons when they are on a 5G network. I believe that operators will be happy to see this, because it will bring them another way to promote 5G.

Android 11 will finally handle variable refresh rates at the system level, so developers and manufacturers will not have to roll out their own solutions. This is a long-awaited feature in the industry. Given that this year's 90Hz and 120Hz screens are expected to usher in popularity, I hope this feature will not arrive too late, otherwise fragmentation problems may occur.

In terms of privacy and security, Android 11 will further restrict access to cameras and microphones. In the new system, their permissions will be similar to location access permissions. Applications in the background cannot call the camera and microphone unless they are providing "foreground services." Android is still restricting access to system storage, and the latest version provides data migration tools for applications.

Although this release is not consumer-oriented, Google offers developers easier installation options: "To simplify the installation process, you can choose the version released today from the Android Flash tool. For those developers who are already running For users of Preview 1 or 1.1, we also provide OTA wireless updates for today ’s release. "Of course, this system version is only available for Pixel phones, including Pixel 2, Pixel 2 XL, Pixel 3, Pixel 3 XL, Pixel 3a, Pixel 3a XL, Pixel 4 and Pixel 4 XL.