Detect Shake Event in Android

Shake Detector in Android Example

public class ShakeDetector implements SensorEventListener {


    private static final float SHAKE_THRESHOLD_GRAVITY = 2.7F;
    private static final int SHAKE_SLOP_TIME_MS = 500;
    private static final int SHAKE_COUNT_RESET_TIME_MS = 3000;

    private OnShakeListener mListener;
    private long mShakeTimestamp;
    private int mShakeCount;

    public void setOnShakeListener(OnShakeListener listener) {
        this.mListener = listener;
    }

    public interface OnShakeListener {
        public void onShake(int count);
    }

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {
        // ignore
    }

    @Override
    public void onSensorChanged(SensorEvent event) {

        if (mListener != null) {
            float x = event.values[0];
            float y = event.values[1];
            float z = event.values[2];

            float gX = x / SensorManager.GRAVITY_EARTH;
            float gY = y / SensorManager.GRAVITY_EARTH;
            float gZ = z / SensorManager.GRAVITY_EARTH;

            // gForce will be close to 1 when there is no movement.
            float gForce = FloatMath.sqrt(gX * gX + gY * gY + gZ * gZ);

            if (gForce > SHAKE_THRESHOLD_GRAVITY) {
                final long now = System.currentTimeMillis();
                // ignore shake events too close to each other (500ms)
                if (mShakeTimestamp + SHAKE_SLOP_TIME_MS > now) {
                    return;
                }

                // reset the shake count after 3 seconds of no shakes
                if (mShakeTimestamp + SHAKE_COUNT_RESET_TIME_MS < now) {
                    mShakeCount = 0;
                }

                mShakeTimestamp = now;
                mShakeCount++;

                mListener.onShake(mShakeCount);
            }
        }
    }
}

Using Seismic shake detection

Seismic is an Android device shake detection library by Square. To use it just start listening to the shake events emitted by it.

@Override
protected void onCreate(Bundle savedInstanceState) {
    sm = (SensorManager) getSystemService(SENSOR_SERVICE);
    sd = new ShakeDetector(() -> { /* react to detected shake */ });
}

@Override
protected void onResume() {
    sd.start(sm);
}

@Override
protected void onPause() {
    sd.stop();
}

To define the a different acceleration threshold use sd.setSensitivity(sensitivity) with a sensitivity of SENSITIVITY_LIGHT, SENSITIVITY_MEDIUM, SENSITIVITY_HARD or any other reasonable integer value. The given default values range from 11 to 15.

Installation

compile 'com.squareup:seismic:1.0.2'