How to detect movement of an android device?

Definitely work with the accelerometer:

// Start with some variablesprivate SensorManager sensorMan;private Sensor accelerometer;private float[] mGravity;private float mAccel;private float mAccelCurrent;private float mAccelLast;// In onCreate methodsensorMan = (SensorManager)getSystemService(SENSOR_SERVICE);accelerometer = sensorMan.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);mAccel = 0.00f;mAccelCurrent = SensorManager.GRAVITY_EARTH;mAccelLast = SensorManager.GRAVITY_EARTH;// And these:@Overridepublic void onResume() {    super.onResume();    sensorMan.registerListener(this, accelerometer,        SensorManager.SENSOR_DELAY_UI);}@Overrideprotected void onPause() {    super.onPause();    sensorMan.unregisterListener(this);}@Overridepublic void onSensorChanged(SensorEvent event) {    if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER){        mGravity = event.values.clone();        // Shake detection        float x = mGravity[0];        float y = mGravity[1];        float z = mGravity[2];        mAccelLast = mAccelCurrent;        mAccelCurrent = FloatMath.sqrt(x*x + y*y + z*z);        float delta = mAccelCurrent - mAccelLast;        mAccel = mAccel * 0.9f + delta;            // Make this higher or lower according to how much            // motion you want to detect        if(mAccel > 3){         // do something        }    }}@Overridepublic void onAccuracyChanged(Sensor sensor, int accuracy) {    // required method}

I used the following class:

public class MovementDetector implements SensorEventListener {protected final String TAG = getClass().getSimpleName();private SensorManager sensorMan;private Sensor accelerometer;private MovementDetector() {}private static MovementDetector mInstance;public static MovementDetector getInstance() {    if (mInstance == null) {        mInstance = new MovementDetector();        mInstance.init();    }    return mInstance;}//////////////////////private HashSet<Listener> mListeners = new HashSet<MovementDetector.Listener>();private void init() {    sensorMan = (SensorManager) GlobalData.getInstance().getContext().getSystemService(Context.SENSOR_SERVICE);    accelerometer = sensorMan.getDefaultSensor(Sensor.TYPE_LINEAR_ACCELERATION);}public void start() {    sensorMan.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_NORMAL);}public void stop() {    sensorMan.unregisterListener(this);}public void addListener(Listener listener) {    mListeners.add(listener);}/* (non-Javadoc) * @see android.hardware.SensorEventListener#onSensorChanged(android.hardware.SensorEvent) */@Overridepublic void onSensorChanged(SensorEvent event) {    if (event.sensor.getType() == Sensor.TYPE_LINEAR_ACCELERATION) {        float x = event.values[0];        float y = event.values[1];        float z = event.values[2];        float diff = (float) Math.sqrt(x * x + y * y + z * z);        if (diff > 0.5) // 0.5 is a threshold, you can test it and change it            Log.d(TAG,"Device motion detected!!!!");        for (Listener listener : mListeners) {            listener.onMotionDetected(event, diff);        }    }}/* (non-Javadoc) * @see android.hardware.SensorEventListener#onAccuracyChanged(android.hardware.Sensor, int) */@Overridepublic void onAccuracyChanged(Sensor sensor, int accuracy) {    // TODO Auto-generated method stub}public interface Listener {    void onMotionDetected(SensorEvent event, float acceleration);    }}

Usage:

On my activity onCrate():

        MovementDetector.getInstance().addListener(new MovementDetector.Listener() {        @Override        public void onMotionDetected(SensorEvent event, float acceleration) {            mMotionDetectionTextView.setText("Acceleration: ["+String.format("%.3f",event.values[0])+","+String.format("%.3f",event.values[1])+","+String.format("%.3f",event.values[2])+"] "+String.format("%.3f", acceleration));            if (acceleration > SettingsHelper.getInstance().getMotionDetectionThreshold()){                mMotionDetectionTextView.setTextColor(Color.RED);            } else {                mMotionDetectionTextView.setTextColor(Color.WHITE);            }        }    });

On my activity onResume():

MovementDetector.getInstance().start();

On my activity onPause():

MovementDetector.getInstance().stop();

This code is for walking detection (Modified from @anthropomo code)

to get smoother value.

// initialize

private SensorManager sensorMan;private Sensor accelerometer;private float[] mGravity;private double mAccel;private double mAccelCurrent;private double mAccelLast;private boolean sensorRegistered = false;

// onCreate

    sensorMan = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);    accelerometer = sensorMan.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);    mAccel = 0.00f;    mAccelCurrent = SensorManager.GRAVITY_EARTH;    mAccelLast = SensorManager.GRAVITY_EARTH;    sensorMan.registerListener(this, accelerometer,            SensorManager.SENSOR_DELAY_NORMAL);    sensorRegistered = true;

// onSensorChanged

private int hitCount = 0;private double hitSum = 0;private double hitResult = 0;private final int SAMPLE_SIZE = 50; // change this sample size as you want, higher is more precise but slow measure.private final double THRESHOLD = 0.2; // change this threshold as you want, higher is more spike movement@Overridepublic void onSensorChanged(SensorEvent event) {    if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {        mGravity = event.values.clone();        // Shake detection        double x = mGravity[0];        double y = mGravity[1];        double z = mGravity[2];        mAccelLast = mAccelCurrent;        mAccelCurrent = Math.sqrt(x * x + y * y + z * z);        double delta = mAccelCurrent - mAccelLast;        mAccel = mAccel * 0.9f + delta;        if (hitCount <= SAMPLE_SIZE) {            hitCount++;            hitSum += Math.abs(mAccel);        } else {            hitResult = hitSum / SAMPLE_SIZE;            Log.d(TAG, String.valueOf(hitResult));            if (hitResult > THRESHOLD) {                Log.d(TAG, "Walking");            } else {                Log.d(TAG, "Stop Walking");            }            hitCount = 0;            hitSum = 0;            hitResult = 0;        }    }}