Aerial Vie

Aerial Vie is a mobile application for smart wearable device (Android Watch) that will change the life of most people who would prefer to live independently in their homes in their old age. It uses the internal sensor for fall detection, and it will automatically send alert text message with GPS location to emergency responders.

Introduction

SensorEventListener offers you methods used for receiving notifications from the SensorManager when sensor values have changed.

This example counts how many times Jumping Jakcs are performed by detecting the value of the Gravity sensor by the following code:

@Override
public void onSensorChanged(SensorEvent event) {
    detectFall(event.values[0], event.timestamp);
}

private void detectFall(float xValue, long timestamp) {
    if ((Math.abs(xValue) > GRAVITY_THRESHOLD)) {
        if(timestamp - mLastTime < TIME_THRESHOLD_NS && mUp != (xValue > 0)) {
            onJumpDetected(!mUp);
        }
        mUp = xValue > 0;
        mLastTime = timestamp;
    }
}

The detectFall method above assumes that when a person is wearing the watch, the x-component of gravity as measured by the Gravity Sensor is +9.8 when the hand is downward and -9.8 when the hand is upward (signs are reversed if the watch is worn on the right hand). Since the upward or downward may not be completely accurate, we leave some room and instead of 9.8, we use GRAVITY_THRESHOLD (7.0f). We also consider the up <-> down movement successful if it takes less than TIME_THRESHOLD_NS (2000000000 nanoseconds).

Pre-requisites

Android SDK v22
Android Build Tools v22.0.1
Android Support Repository

Screenshots

Getting Started

This sample uses the Gradle build system. To build this project, use the "gradlew build" command or use "Import Project" in Android Studio.

Support

Google+ Community: https://plus.google.com/communities/105153134372062985968
Stack Overflow: http://stackoverflow.com/questions/tagged/android

If you've found an error in this sample, please file an issue: https://github.com/googlesamples/android-JumpingJack

Patches are encouraged, and may be submitted by forking this project and submitting a pull request through GitHub. Please see CONTRIBUTING.md for more details.

License

Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

jzhao415 / Aerial-Vie