This app is Haptic Feedback Checker, for Android App developer.

Please check "Implements" in menu, how to implement Haptic Feedback.

I don't understand how vibrate my device when I'm developing Android app using HapticFeedbackConstants.
And I searched Haptic Feedback Checker on Google Play, but I can't find it.
So, I made this app.

Recommend:
up to Android 8.0
Pixel smartphone (ex. Pixel2, Pixel 5a...)