ShakeSensorListener.java

package com.limemobile.app.launcher.util;

import android.hardware.SensorListener;
import android.hardware.SensorManager;

public abstract class ShakeSensorListener implements SensorListener {

	private double mTotalForcePrev; // stores the previous total force value

	public void onAccuracyChanged(int i, int j) {
		// ignore

	}

	public void onSensorChanged(int sensor, float[] values) {
		if (sensor == SensorManager.SENSOR_ACCELEROMETER) {
			double forceThreshHold = 1.5f;

			double totalForce = 0.0f;
			totalForce += Math.pow(values[SensorManager.DATA_X]
					/ SensorManager.GRAVITY_EARTH, 2.0);
			totalForce += Math.pow(values[SensorManager.DATA_Y]
					/ SensorManager.GRAVITY_EARTH, 2.0);
			totalForce += Math.pow(values[SensorManager.DATA_Z]
					/ SensorManager.GRAVITY_EARTH, 2.0);
			totalForce = Math.sqrt(totalForce);

			if ((totalForce < forceThreshHold)
					&& (mTotalForcePrev > forceThreshHold)) {
				onShake();
			}

			mTotalForcePrev = totalForce;
		}
	}

	public abstract void onShake();

}