地震感知警報器 is an Android app developed by eKnight that allows users to detect earthquakes or other vibrations. When the user is sleeping or resting, they can activate the app to run in the background and detect any seismic activity. In the event of an earthquake, the app will sound an alarm to alert the user to quickly evacuate and find shelter.

Users have the ability to set the alert threshold based on the variation in the three axes of three-dimensional space. Once the variation in any of the axes exceeds the user's set threshold, the app will sound the alarm. It is important to note that the threshold set by the user is only applicable for the current background detection session.

One of the key features of this app is its ability to run in the background without the need for the app interface to be open. Users can initiate background detection by entering the app interface and pressing the "Start Background Detection" button. After that, they can exit the app interface, and the app's detector will continue to run in the background, providing continuous protection.

To stop the detector from running, users can enter the app interface and press the "Stop Background Detection" button. Once stopped, the app's detector will no longer be active in the background.

Please note that this app is available for free. However, the developer encourages users to contribute their resources and efforts to assist victims of natural disasters like earthquakes and tsunamis, helping them rebuild their lives. It is through the collective efforts and compassion of humanity that we can overcome the challenges that nature presents to us.