开发应用时如何获取用户全应用场景下的打字速度？

Great question—this boils down to platform-specific limitations, privacy rules, and whether system-level metadata actually exists for this. Let’s break it down clearly:

Core Reality First #

There is no system-wide stored metadata for "cross-app average WPM" on any major platform. The idea of this data being readily available in metadata is a common misconception—operating systems don’t track or store this aggregated metric natively. Any typing speed data is either tracked by individual apps for their own use, or you’ll need to calculate it yourself by monitoring input events.

Platform-by-Platform Breakdown #

iOS #

Apple’s sandboxing model is extremely restrictive. No non-jailbroken app can access input events or data from other apps. Even if you wanted to track typing activity outside your app, the system blocks this entirely to protect user privacy. Jailbreaking would let you bypass this, but that’s not a viable solution for a public, App Store-compliant app.

Android #

• Regular Apps: Android’s privacy controls (especially Android 10+) block apps from accessing input events from other apps by default. You can’t read any cross-app typing data without special permissions.
• Accessibility Service: The only official way to monitor cross-app input is via an Accessibility Service. This requires explicit user authorization, and Google strictly enforces that these services are used only for accessibility purposes (not just tracking typing speed). If you go this route, you’d have to listen for key events, track timing, and calculate WPM yourself—there’s no pre-existing metadata to pull. Misusing this permission will get your app rejected from the Play Store.

Desktop (Windows/macOS) #

• Windows: You can use global keyboard hooks (SetWindowsHookEx) to listen for all key presses system-wide. This lets you track typing activity across apps, but you’ll need to handle calculating WPM yourself. Note that this requires elevated permissions, and many antivirus tools flag hook-based apps as suspicious.
• macOS: To monitor global keyboard events, you’ll need to enable Accessibility permissions for your app and use CGEventTap to capture key presses. Again, you’ll have to compute WPM manually—there’s no system-stored metric for this.

Key Privacy Considerations #

Any solution that tracks cross-app typing activity touches on sensitive user privacy. All platforms require explicit, clear user consent before accessing this kind of data. Even if technically possible, violating privacy policies will result in your app being rejected (for mobile) or flagged as malicious (for desktop).

内容的提问来源于stack exchange，提问作者MrRobot9