How to refresh app upon shaking the device

Question

I need to add a shake feature that will refresh my Android application   All I find of documentation involves implementing the SensorListener  but Eclipse tells me it s deprecated and suggest SensorEventListener    Anybody that has a nice guide to how I go about creating this shake controller

User · Answer

Here is another code for this   import java util List  import java util Timer  import java util TimerTask   import android content Context  import android hardware Sensor  import android hardware SensorEvent  import android hardware SensorEventListener  import android hardware SensorManager  import android os Handler      public class AccelerometerListener implements SensorEventListener            private SensorManager sensorManager          private List lt Sensor gt  sensors          private Sensor sensor          private long lastUpdate   -1          private long currentTime   -1          private Main parent          private Timer timer          private int shakes          private static final Handler mHandler   new Handler             private float last x  last y  last z          private float current x  current y  current z  currenForce          private static final int FORCE THRESHOLD   500          private final int DATA X   SensorManager DATA X          private final int DATA Y   SensorManager DATA Y          private final int DATA Z   SensorManager DATA Z           public AccelerometerListener Main parent                SensorManager sensorService    SensorManager  parent                      getSystemService Context SENSOR SERVICE                this sensorManager   sensorService              if  sensorService    null                  return               this sensors   sensorManager getSensorList Sensor TYPE ACCELEROMETER               if  sensors size    gt  0                    sensor   sensors get 0                              this parent   parent                     public void start                 if  sensor    null                  return               sensorManager registerListener this  sensor                      SensorManager SENSOR DELAY GAME                      public void stop                 if  sensorManager    null                  return               sensorManager unregisterListener this                      public void onAccuracyChanged Sensor s  int valu                        public void onSensorChanged SensorEvent event                 if  event sensor getType      Sensor TYPE ACCELEROMETER                  return               currentTime   System currentTimeMillis                 if   currentTime - lastUpdate   gt  50                    long diffTime    currentTime - lastUpdate                   lastUpdate   currentTime                   current x   event values DATA X                   current y   event values DATA Y                   current z   event values DATA Z                    currenForce   Math abs current x   current y   current z - last x                         - last y - last z                            diffTime   10000                   if  currenForce  gt  FORCE THRESHOLD                        shakeDetected                                      last x   current x                  last y   current y                  last z   current z                                    private void shakeDetected                 shakes                 if  shakes    1                    if  timer    null                        timer cancel                                       timer   new Timer                    timer schedule new TimerTask                           Override                     public void run                             if  shakes  gt  3                                mHandler post new Runnable                                      public void run                                            shake                                                                                                                      shakes   0                                           500

User · Answer

Here is an example code  Put this into your activity class        put this into your activity class      private SensorManager mSensorManager    private float mAccel     acceleration apart from gravity   private float mAccelCurrent     current acceleration including gravity   private float mAccelLast     last acceleration including gravity    private final SensorEventListener mSensorListener   new SensorEventListener          public void onSensorChanged SensorEvent se          float x   se values 0         float y   se values 1         float z   se values 2         mAccelLast   mAccelCurrent        mAccelCurrent    float  Math sqrt  double   x x   y y   z z          float delta   mAccelCurrent - mAccelLast        mAccel   mAccel   0 9f   delta     perform low-cut filter            public void onAccuracyChanged Sensor sensor  int accuracy                   Override   protected void onResume         super onResume        mSensorManager registerListener mSensorListener  mSensorManager getDefaultSensor Sensor TYPE ACCELEROMETER   SensorManager SENSOR DELAY NORMAL           Override   protected void onPause         mSensorManager unregisterListener mSensorListener       super onPause          And add this to your onCreate method          do this in onCreate        mSensorManager    SensorManager  getSystemService Context SENSOR SERVICE       mSensorManager registerListener mSensorListener  mSensorManager getDefaultSensor Sensor TYPE ACCELEROMETER   SensorManager SENSOR DELAY NORMAL       mAccel   0 00f      mAccelCurrent   SensorManager GRAVITY EARTH      mAccelLast   SensorManager GRAVITY EARTH    You can then ask  mAccel  wherever you want in your application for the current acceleration  independent from the axis and cleaned from static acceleration such as gravity  It will be approx  0 if there is no movement  and  lets say  2 if the device is shaked   Based on the comments - to test this   if  mAccel  gt  12        Toast toast   Toast makeText getApplicationContext     Device has shaken    Toast LENGTH LONG       toast show        Notes   The accelometer should be deactivated onPause and activated onResume to save resources  CPU  Battery   The code assumes we are on planet Earth  -  and initializes the acceleration to earth gravity  Otherwise you would get a strong  shake  when the application starts and  hits  the ground from free-fall  However  the code gets used to the gravitation due to the low-cut filter and would work also on other planets or in free space  once it is initialized   you never know how long your application will be in use    -

User · Answer

Here is my code for shake gesture detection   import android hardware Sensor  import android hardware SensorEvent  import android hardware SensorEventListener  import android hardware SensorManager           Listener that detects shake gesture      public class ShakeEventListener implements SensorEventListener           Minimum movement force to consider       private static final int MIN FORCE   10              Minimum times in a shake gesture that the direction of movement needs to      change          private static final int MIN DIRECTION CHANGE   3         Maximum pause between movements       private static final int MAX PAUSE BETHWEEN DIRECTION CHANGE   200         Maximum allowed time for shake gesture       private static final int MAX TOTAL DURATION OF SHAKE   400         Time when the gesture started       private long mFirstDirectionChangeTime   0         Time when the last movement started       private long mLastDirectionChangeTime         How many movements are considered so far       private int mDirectionChangeCount   0         The last x position       private float lastX   0         The last y position       private float lastY   0         The last z position       private float lastZ   0         OnShakeListener that is called when shake is detected       private OnShakeListener mShakeListener              Interface for shake gesture          public interface OnShakeListener                   Called when shake gesture is detected              void onShake           public void setOnShakeListener OnShakeListener listener        mShakeListener   listener          Override   public void onSensorChanged SensorEvent se           get sensor data     float x   se values SensorManager DATA X       float y   se values SensorManager DATA Y       float z   se values SensorManager DATA Z           calculate movement     float totalMovement   Math abs x   y   z - lastX - lastY - lastZ        if  totalMovement  gt  MIN FORCE              get time       long now   System currentTimeMillis              store first movement time       if  mFirstDirectionChangeTime    0            mFirstDirectionChangeTime   now          mLastDirectionChangeTime   now                    check if the last movement was not long ago       long lastChangeWasAgo   now - mLastDirectionChangeTime        if  lastChangeWasAgo  lt  MAX PAUSE BETHWEEN DIRECTION CHANGE                store movement data         mLastDirectionChangeTime   now          mDirectionChangeCount                store last sensor data          lastX   x          lastY   y          lastZ   z              check how many movements are so far         if  mDirectionChangeCount  gt   MIN DIRECTION CHANGE                  check total duration           long totalDuration   now - mFirstDirectionChangeTime            if  totalDuration  lt  MAX TOTAL DURATION OF SHAKE                mShakeListener onShake                resetShakeParameters                                   else           resetShakeParameters                                  Resets the shake parameters to their default values          private void resetShakeParameters         mFirstDirectionChangeTime   0      mDirectionChangeCount   0      mLastDirectionChangeTime   0      lastX   0      lastY   0      lastZ   0          Override   public void onAccuracyChanged Sensor sensor  int accuracy             Add this in your activity     private SensorManager mSensorManager     private ShakeEventListener mSensorListener         in onCreate   add       mSensorManager    SensorManager  getSystemService Context SENSOR SERVICE       mSensorListener   new ShakeEventListener            mSensorListener setOnShakeListener new ShakeEventListener OnShakeListener            public void onShake             Toast makeText KPBActivityImpl this   Shake    Toast LENGTH SHORT  show                      and    Override   protected void onResume         super onResume        mSensorManager registerListener mSensorListener          mSensorManager getDefaultSensor Sensor TYPE ACCELEROMETER           SensorManager SENSOR DELAY UI           Override   protected void onPause         mSensorManager unregisterListener mSensorListener       super onPause

User · Answer

I have tried several implementations  but would like to share my own  It uses G-force as unit for the threshold calculation  It makes it a bit easier to understand what is going on  and also with setting a good threshold   It simply registers a increase in G force and triggers the listener if it exceeds the threshold  It doesn t use any direction thresholds  cause you don t really need that if you just want to register a good shake   Of-course you need the standard registering and UN-registering of this listener in the Activity    Also  to check what threshold you need  I recommend the following app  I am not in any way connected to that app       public class UmitoShakeEventListener implements SensorEventListener                   The gforce that is necessary to register as shake   Must include 1G        gravity              private final float shakeThresholdInGForce   2 25F       private final float gravityEarth   SensorManager GRAVITY EARTH       private OnShakeListener listener       public void setOnShakeListener OnShakeListener listener            this listener   listener             public interface OnShakeListener           public void onShake                Override     public void onAccuracyChanged Sensor sensor  int accuracy               ignore              Override     public void onSensorChanged SensorEvent event             if  listener    null                float x   event values 0               float y   event values 1               float z   event values 2                float gX   x   gravityEarth              float gY   y   gravityEarth              float gZ   z   gravityEarth                 G-Force will be 1 when there is no movement   gravity              float gForce   FloatMath sqrt gX   gX   gY   gY   gZ   gZ                   if  gForce  gt  shakeThresholdInGForce                    listener onShake

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package com example shakingapp   import android app Activity  import android graphics Color  import android hardware Sensor  import android hardware SensorEvent  import android hardware SensorEventListener  import android hardware SensorManager  import android os Bundle  import android view View  import android view Window  import android view WindowManager  import android widget Toast    public class MainActivity extends Activity implements SensorEventListener     private SensorManager sensorManager    private boolean color   false    private View view    private long lastUpdate        Called when the activity is first created         Override   public void onCreate Bundle savedInstanceState        requestWindowFeature Window FEATURE NO TITLE       getWindow   setFlags WindowManager LayoutParams FLAG FULLSCREEN          WindowManager LayoutParams FLAG FULLSCREEN        super onCreate savedInstanceState       setContentView R layout activity main       view   findViewById R id textView       view setBackgroundColor Color GREEN        sensorManager    SensorManager  getSystemService SENSOR SERVICE       lastUpdate   System currentTimeMillis            Override   public void onSensorChanged SensorEvent event        if  event sensor getType      Sensor TYPE ACCELEROMETER          getAccelerometer event                 private void getAccelerometer SensorEvent event        float   values   event values         Movement     float x   values 0       float y   values 1       float z   values 2        System out println x       System out println y       System out println z       System out println SensorManager GRAVITY EARTH         float accelationSquareRoot    x   x   y   y   z   z             SensorManager GRAVITY EARTH   SensorManager GRAVITY EARTH        long actualTime   System currentTimeMillis        if  accelationSquareRoot  gt   2                 if  actualTime - lastUpdate  lt  200            return                lastUpdate   actualTime        Toast makeText this   Device was shuffed   accelationSquareRoot  Toast LENGTH SHORT             show          if  color            view setBackgroundColor Color GREEN            else           view setBackgroundColor Color RED                 color    color                Override   public void onAccuracyChanged Sensor sensor  int accuracy             Override   protected void onResume         super onResume           register this class as a listener for the orientation and        accelerometer sensors     sensorManager registerListener this          sensorManager getDefaultSensor Sensor TYPE ACCELEROMETER           SensorManager SENSOR DELAY NORMAL           Override   protected void onPause            unregister listener     super onPause        sensorManager unregisterListener this

User · Answer

You can use seismic  An example can be found here

User · Answer

package anywheresoftware b4a student   import android hardware Sensor  import android hardware SensorEvent  import android hardware SensorEventListener  import android hardware SensorManager  import android util FloatMath   public class ShakeEventListener implements SensorEventListener                  The gForce that is necessary to register as shake         Must be greater than 1G  one earth gravity unit          You can install  G-Force   by Blake La Pierre        from the Google Play Store and run it to see how         many G s it takes to register a shake             private static final float SHAKE THRESHOLD GRAVITY   2 7F      private static int SHAKE SLOP TIME MS   500      private static final int SHAKE COUNT RESET TIME MS   1000       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  gt  SHAKE THRESHOLD GRAVITY                    final long now   System currentTimeMillis                       ignore shake events too close to each other  500ms                  if  mShakeTimestamp   getSHAKE SLOP TIME MS    gt  now                        return                                        reset the shake count after 3 seconds of no shakes                 if  mShakeTimestamp   SHAKE COUNT RESET TIME MS  lt  now                        mShakeCount   0                                     mShakeTimestamp   now                  mShakeCount                     mListener onShake mShakeCount                                      private long getSHAKE SLOP TIME MS                TODO Auto-generated method stub         return SHAKE SLOP TIME MS             public void setSHAKE SLOP TIME MS int sHAKE SLOP TIME MS            SHAKE SLOP TIME MS   sHAKE SLOP TIME MS

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I really liked Peterdk s answer   I took it upon myself to make a coulpe of tweaks to his code    file  ShakeDetector java  import android hardware Sensor  import android hardware SensorEvent  import android hardware SensorEventListener  import android hardware SensorManager  import android util FloatMath   public class ShakeDetector implements SensorEventListener           The gForce that is necessary to register as shake  Must be greater than 1G  one earth gravity unit      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  gt  SHAKE THRESHOLD GRAVITY                    final long now   System currentTimeMillis                       ignore shake events too close to each other  500ms                  if  mShakeTimestamp   SHAKE SLOP TIME MS  gt  now                         return                                        reset the shake count after 3 seconds of no shakes                 if  mShakeTimestamp   SHAKE COUNT RESET TIME MS  lt  now                         mShakeCount   0                                     mShakeTimestamp   now                  mShakeCount                     mListener onShake mShakeCount                                     Also  don t forget that you need to register an instance of the ShakeDetector with the SensorManager      ShakeDetector initialization mSensorManager    SensorManager  getSystemService Context SENSOR SERVICE   mAccelerometer   mSensorManager getDefaultSensor Sensor TYPE ACCELEROMETER   mShakeDetector   new ShakeDetector    mShakeDetector setOnShakeListener new OnShakeListener           Override     public void onShake int count                handleShakeEvent count                       mSensorManager registerListener mShakeDetector  mAccelerometer  SensorManager SENSOR DELAY UI

User · Answer

Working with me v good Reference  public class ShakeEventListener implements SensorEventListener   public final static int SHAKE LIMIT   15  public final static int LITTLE SHAKE LIMIT   5   private SensorManager mSensorManager  private float mAccel   0 00f  private float mAccelCurrent   SensorManager GRAVITY EARTH  private float mAccelLast   SensorManager GRAVITY EARTH   private ShakeListener listener   public interface ShakeListener       public void onShake        public void onLittleShake       public ShakeEventListener ShakeListener l        Activity a    Activity  l      mSensorManager    SensorManager  a getSystemService Context SENSOR SERVICE       listener   l      registerListener       public ShakeEventListener Activity a  ShakeListener l        mSensorManager    SensorManager  a getSystemService Context SENSOR SERVICE       listener   l      registerListener       public void registerListener         mSensorManager registerListener this  mSensorManager getDefaultSensor Sensor TYPE ACCELEROMETER   SensorManager SENSOR DELAY NORMAL      public void unregisterListener         mSensorManager unregisterListener this      public void onSensorChanged SensorEvent se        float x   se values 0       float y   se values 1       float z   se values 2       mAccelLast   mAccelCurrent      mAccelCurrent    float  FloatMath sqrt x x   y y   z z       float delta   mAccelCurrent - mAccelLast      mAccel   mAccel   0 9f   delta      if mAccel  gt  SHAKE LIMIT          listener onShake        else if mAccel  gt  LITTLE SHAKE LIMIT          listener onLittleShake       public void onAccuracyChanged Sensor sensor  int accuracy

User · Answer

You should subscribe as a SensorEventListener  and get the accelerometer data  Once you have it  you should monitor for sudden change in direction  sign  of acceleration on a certain axis  It would be a good indication for the  shake  movement of device

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I have written a small example for detecting vertical and horizontal shakes and showing a Toast   public class Accelerometerka2Activity extends Activity implements SensorEventListener        private float mLastX  mLastY  mLastZ      private boolean mInitialized      private SensorManager mSensorManager      private Sensor mAccelerometer      private final float NOISE    float  8 0        Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout main           mInitialized   false          mSensorManager    SensorManager  getSystemService Context SENSOR SERVICE           mAccelerometer   mSensorManager getDefaultSensor Sensor TYPE ACCELEROMETER           mSensorManager registerListener this  mAccelerometer   SensorManager SENSOR DELAY NORMAL              protected void onResume             super onResume            mSensorManager registerListener this  mAccelerometer  SensorManager SENSOR DELAY NORMAL              protected void onPause             super onPause            mSensorManager unregisterListener this               public void onAccuracyChanged Sensor sensor  int accuracy               can be safely ignored for this demo             public void onSensorChanged SensorEvent event            float x   event values 0           float y   event values 1           float z   event values 2           if   mInitialized                mLastX   x              mLastY   y              mLastZ   z              mInitialized   true            else               float deltaX   Math abs mLastX - x               float deltaY   Math abs mLastY - y               float deltaZ   Math abs mLastZ - z               if  deltaX  lt  NOISE  deltaX    float 0 0              if  deltaY  lt  NOISE  deltaY    float 0 0              if  deltaZ  lt  NOISE  deltaZ    float 0 0              mLastX   x              mLastY   y              mLastZ   z              if  deltaX  gt  deltaY                    Toast makeText getBaseContext     Horizental   Toast LENGTH SHORT  show                  else if  deltaY  gt  deltaX                    Toast makeText getBaseContext     Vertical   Toast LENGTH SHORT  show

User · Answer

Shaker java              import java util ArrayList      import android content Context      import android hardware Sensor      import android hardware SensorEvent      import android hardware SensorEventListener      import android hardware SensorManager       public class Shaker implements SensorEventListener           private static final String SENSOR SERVICE   Context SENSOR SERVICE          private SensorManager sensorMgr          private Sensor mAccelerometer          private boolean accelSupported          private long timeInMillis          private long threshold          private OnShakerTreshold listener          ArrayList lt Float gt  valueStack           public Shaker Context context  OnShakerTreshold listener  long timeInMillis  long threshold                try                   this timeInMillis   timeInMillis                  this threshold   threshold                  this listener   listener                  if  timeInMillis lt 100                       throw new Exception  timeInMillis  lt  100ms                                      valueStack   new ArrayList lt Float gt   int  timeInMillis 100                    sensorMgr    SensorManager  context getSystemService SENSOR SERVICE                   mAccelerometer   sensorMgr getDefaultSensor Sensor TYPE ACCELEROMETER                  catch  Exception e                   e printStackTrace                                     public void start                 try                   accelSupported   sensorMgr registerListener this  mAccelerometer  SensorManager SENSOR DELAY GAME                    if   accelSupported                        stop                        throw new Exception  Sensor is not supported                                    catch  Exception e                   e printStackTrace                                     public void stop                try                   sensorMgr unregisterListener this  mAccelerometer                 catch  Exception e                   e printStackTrace                                      Override         protected void finalize   throws Throwable               try                   stop                  catch  Exception e                   e printStackTrace                              super finalize                       long lastUpdate   0          private float last x          private float last y          private float last z   public void onSensorChanged SensorEvent event        try           if  event sensor    mAccelerometer                long curTime   System currentTimeMillis                if   curTime-lastUpdate  gt getNumberOfMeasures                      lastUpdate   System currentTimeMillis                    float   values   event values                  if  valueStack size   gt  int getNumberOfMeasures                        valueStack remove 0                   float x    int  values SensorManager DATA X                    float y    int  values SensorManager DATA Y                    float z    int  values SensorManager DATA Z                    float speed   Math abs  x y z  -  last x   last y   last z                     valueStack add speed                    String posText   String format  X  4 0f Y  4 0f Z  4 0f    x-last x    y-last y    z-last z                     last x    x                   last y    y                   last z    z                    float sumOfValues   0                  float avgOfValues   0                   for  float f   valueStack                           sumOfValues    sumOfValues f                                     avgOfValues   sumOfValues  int getNumberOfMeasures                     if  avgOfValues gt  threshold                       listener onTreshold                        valueStack clear                                       System out println String format  M    4d A   5 0f V   4 0f  s   valueStack size   avgOfValues speed posText                                   catch  Exception e           e printStackTrace                      private long getNumberOfMeasures                 return timeInMillis 100                     public void onAccuracyChanged Sensor sensor  int accuracy              public interface OnShakerTreshold               public void onTreshold                      MainActivity java  public class MainActivity extends Activity implements OnShakerTreshold        private Shaker s        Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main           s   new Shaker getApplicationContext    this  5000  20              5000   5 second of shaking            20   minimal threshold  very angry shaking  D             beware screen rotation reset counter             Override     protected void onResume             s start            super onResume                Override     protected void onPause             s stop            super onPause               public void onTreshold             System out println  FIRE LISTENER            RingtoneManager getRingtone getApplicationContext    RingtoneManager getDefaultUri RingtoneManager TYPE NOTIFICATION   play                Have fun

User · Answer

You might want to try open source tinybus  With it shake detection is as easy as this   public class MainActivity extends Activity        private Bus mBus        Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState                           Create a bus and attach it to activity         mBus   TinyBus from this  wire new ShakeEventWire                 Subscribe     public void onShakeEvent ShakeEvent event            Toast makeText this   Device has been shaken                    Toast LENGTH SHORT  show                Override     protected void onStart             super onStart            mBus register this               Override     protected void onStop             mBus unregister this           super onStop              It uses seismic for shake detection

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Need to implement SensorListener public class ShakeActivity extends Activity implements SensorListener      For shake motion detection  private SensorManager sensorMgr  private long lastUpdate   -1  private float x  y  z  private float last x  last y  last z  private static final int SHAKE THRESHOLD   800   protected void onCreate Bundle savedInstanceState    super onCreate savedInstanceState      start motion detection sensorMgr    SensorManager  getSystemService SENSOR SERVICE   boolean accelSupported   sensorMgr registerListener this      SensorManager SENSOR ACCELEROMETER      SensorManager SENSOR DELAY GAME    if   accelSupported           on accelerometer on this device     sensorMgr unregisterListener this              SensorManager SENSOR ACCELEROMETER        protected void onPause     if  sensorMgr    null        sensorMgr unregisterListener this              SensorManager SENSOR ACCELEROMETER       sensorMgr   null        super onPause       public void onAccuracyChanged int arg0  int arg1       TODO Auto-generated method stub    public void onSensorChanged int sensor  float   values    if  sensor    SensorManager SENSOR ACCELEROMETER        long curTime   System currentTimeMillis           only allow one update every 100ms      if   curTime - lastUpdate  gt  100        long diffTime    curTime - lastUpdate       lastUpdate   curTime       x   values SensorManager DATA X       y   values SensorManager DATA Y       z   values SensorManager DATA Z        float speed   Math abs x y z - last x - last y - last z                              diffTime   10000      if  speed  gt  SHAKE THRESHOLD               yes  this is a shake action  Do something about it            last x   x      last y   y      last z   z

User · Answer

Here s yet another implementation that builds on some of the tips in here as well as the code from the Android developer site   MainActivity java  public class MainActivity extends Activity        private ShakeDetector mShakeDetector      private SensorManager mSensorManager      private Sensor mAccelerometer        Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main               ShakeDetector initialization         mSensorManager    SensorManager  getSystemService Context SENSOR SERVICE           mAccelerometer   mSensorManager getDefaultSensor Sensor TYPE ACCELEROMETER           mShakeDetector   new ShakeDetector new OnShakeListener                  Override             public void onShake                        Do stuff                                        Override     protected void onResume             super onResume            mSensorManager registerListener mShakeDetector  mAccelerometer  SensorManager SENSOR DELAY UI               Override     protected void onPause             mSensorManager unregisterListener mShakeDetector           super onPause                 ShakeDetector java  package com example test   import android hardware Sensor  import android hardware SensorEvent  import android hardware SensorEventListener   public class ShakeDetector implements SensorEventListener           Minimum acceleration needed to count as a shake movement     private static final int MIN SHAKE ACCELERATION   5          Minimum number of movements to register a shake     private static final int MIN MOVEMENTS   2          Maximum time  in milliseconds  for the whole shake to occur     private static final int MAX SHAKE DURATION   500          Arrays to store gravity and linear acceleration values     private float   mGravity     0 0f  0 0f  0 0f        private float   mLinearAcceleration     0 0f  0 0f  0 0f            Indexes for x  y  and z values     private static final int X   0      private static final int Y   1      private static final int Z   2          OnShakeListener that will be notified when the shake is detected     private OnShakeListener mShakeListener          Start time for the shake detection     long startTime   0          Counter for shake movements     int moveCount   0          Constructor that sets the shake listener     public ShakeDetector OnShakeListener shakeListener            mShakeListener   shakeListener              Override     public void onSensorChanged SensorEvent event               This method will be called when the accelerometer detects a change              Call a helper method that wraps code from the Android developer site         setCurrentAcceleration event               Get the max linear acceleration in any direction         float maxLinearAcceleration   getMaxCurrentLinearAcceleration                Check if the acceleration is greater than our minimum threshold         if  maxLinearAcceleration  gt  MIN SHAKE ACCELERATION                long now   System currentTimeMillis                    Set the startTime if it was reset to zero             if  startTime    0                    startTime   now                             long elapsedTime   now - startTime                  Check if we re still in the shake window we defined             if  elapsedTime  gt  MAX SHAKE DURATION                       Too much time has passed  Start over                  resetShakeDetection                              else                      Keep track of all the movements                 moveCount                        Check if enough movements have been made to qualify as a shake                 if  moveCount  gt  MIN MOVEMENTS                           It s a shake  Notify the listener                      mShakeListener onShake                            Reset for the next one                      resetShakeDetection                                                          Override     public void onAccuracyChanged Sensor sensor  int accuracy               Intentionally blank            private void setCurrentAcceleration SensorEvent event                           BEGIN SECTION from Android developer site  This code accounts for              gravity using a high-pass filter                         alpha is calculated as t    t   dT             with t  the low-pass filter s time-constant            and dT  the event delivery rate          final float alpha   0 8f              Gravity components of x  y  and z acceleration         mGravity X    alpha   mGravity X     1 - alpha    event values X           mGravity Y    alpha   mGravity Y     1 - alpha    event values Y           mGravity Z    alpha   mGravity Z     1 - alpha    event values Z               Linear acceleration along the x  y  and z axes  gravity effects removed          mLinearAcceleration X    event values X  - mGravity X           mLinearAcceleration Y    event values Y  - mGravity Y           mLinearAcceleration Z    event values Z  - mGravity Z                           END SECTION from Android developer site                        private float getMaxCurrentLinearAcceleration                Start by setting the value to the x value         float maxLinearAcceleration   mLinearAcceleration X               Check if the y value is greater         if  mLinearAcceleration Y   gt  maxLinearAcceleration                maxLinearAcceleration   mLinearAcceleration Y                         Check if the z value is greater         if  mLinearAcceleration Z   gt  maxLinearAcceleration                maxLinearAcceleration   mLinearAcceleration Z                         Return the greatest value         return maxLinearAcceleration             private void resetShakeDetection             startTime   0          moveCount   0                 I d normally put this definition in it s own  java file      public interface OnShakeListener           public void onShake

User · Answer

I am developing a motion-detection and shake-detection app for my university project   Besides the original target of the application  I am splitting the library part  responsible for motion and shake detection  from the app  The code is free  available on SourceForge with the project name  BenderCatch   Documentation I am producing will be ready around mid-september  http   sf net projects bendercatch  It uses a more precise way to detect shake  watches BOTH the difference of force between SensorEvents AND the oscillations present in X and Y axis when you perform a shake  It can even make a sound  or vibrate  on each oscillation of the shake   Feel free to ask me more by e-mail at raffaele  at  terzigno  dot  com

[android] How to refresh app upon shaking the device?

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