How to implement gyroscope sensor in android? -

i'm trying write simplest implementation of gyroscope (only log orientation of screen when it's changed). provide simple example of this?

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this i'm trying right now:

public class lessonfiveglsurfaceview extends glsurfaceview implements sensoreventlistener          {         private lessonfiverenderer mrenderer;          public lessonfiveglsurfaceview(context context)          {             super(context);              system.out.println("test");         }         @override           public void onsensorchanged(sensorevent event)           {               //output roll, pitch , yawn values               system.out.println("orientation x (roll) :"+ float.tostring(event.values[2]) +"\n"+                          "orientation y (pitch) :"+ float.tostring(event.values[1]) +"\n"+                          "orientation z (yaw) :"+ float.tostring(event.values[0]));           }   

however i'm getting error: "the type lessonfiveglsurfaceview must implement inherited abstract method sensoreventlistener.onaccuracychanged(sensor, int)".

here class came absract use gyroscope sensor in android smooth input data little, correct orientation output tablet , phone doesn't have same natural orientation (phone in portrait while tablet in landscape):

/** * uses sensor api determine phones orientation. * registering events accelerator , magnetometer (compass) * rotation matrix computed. matrix can used rotate * opengl scene. */ public class phonegyroscope  implements sensoreventlistener{ private static final string tag = phonegyroscope.class.getsimplename(); private sensormanager msensormanager; private windowmanager mwindowmanager; private float[] maccelgravitydata = new float[3]; private float[] mgeomagneticdata = new float[3]; private float[] mrotationmatrix = new float[16]; private float[] bufferedaccelgdata = new float[3]; private float[] bufferedmagnetdata = new float[3];  public phonegyroscope(context context) {     msensormanager = (sensormanager) context.getsystemservice(context.sensor_service);     mwindowmanager = (windowmanager) context.getsystemservice(context.window_service); }  public void start() {     msensormanager.registerlistener(this, msensormanager.getdefaultsensor(sensor.type_accelerometer), sensormanager.sensor_delay_game );     msensormanager.registerlistener(this, msensormanager.getdefaultsensor(sensor.type_magnetic_field), sensormanager.sensor_delay_game ); }  public void stop() {     msensormanager.unregisterlistener(this); }  private void loadnewsensordata(sensorevent event) {     final int type = event.sensor.gettype();     if (type == sensor.type_accelerometer) {         //smoothing sensor data bit         maccelgravitydata[0]=(maccelgravitydata[0]*2+event.values[0])*0.33334f;         maccelgravitydata[1]=(maccelgravitydata[1]*2+event.values[1])*0.33334f;         maccelgravitydata[2]=(maccelgravitydata[2]*2+event.values[2])*0.33334f;     }     if (type == sensor.type_magnetic_field) {         //smoothing sensor data bit         mgeomagneticdata[0]=(mgeomagneticdata[0]*1+event.values[0])*0.5f;         mgeomagneticdata[1]=(mgeomagneticdata[1]*1+event.values[1])*0.5f;         mgeomagneticdata[2]=(mgeomagneticdata[2]*1+event.values[2])*0.5f;          float x = mgeomagneticdata[0];         float y = mgeomagneticdata[1];         float z = mgeomagneticdata[2];         double field = math.sqrt(x*x+y*y+z*z);         if (field>25 && field<65){             log.e(tag, "loadnewsensordata : wrong magnetic data, need recalibration field = " + field);         }     } }   private void rootmeansquarebuffer(float[] target, float[] values) {      final float amplification = 200.0f;     float buffer = 20.0f;      target[0] += amplification;     target[1] += amplification;     target[2] += amplification;     values[0] += amplification;     values[1] += amplification;     values[2] += amplification;      target[0] = (float) (math             .sqrt((target[0] * target[0] * buffer + values[0] * values[0])                     / (1 + buffer)));     target[1] = (float) (math             .sqrt((target[1] * target[1] * buffer + values[1] * values[1])                     / (1 + buffer)));     target[2] = (float) (math             .sqrt((target[2] * target[2] * buffer + values[2] * values[2])                     / (1 + buffer)));      target[0] -= amplification;     target[1] -= amplification;     target[2] -= amplification;     values[0] -= amplification;     values[1] -= amplification;     values[2] -= amplification; }   /*  * tablets have landscape default orientation, screen rotation 0 or 180 when orientation landscape, , smartphones have portrait.  * use next code difference between tablets , smartphones:  */ public static int getscreenorientation(display display){     int orientation;      if(display.getwidth()==display.getheight()){         orientation = configuration.orientation_square;     }else{ //if width less height portrait         if(display.getwidth() < display.getheight()){             orientation = configuration.orientation_portrait;         }else{ // if not of above definitly landscape             orientation = configuration.orientation_landscape;         }     }        return orientation; }  private void debugsensordata(sensorevent event) {     stringbuilder builder = new stringbuilder();     builder.append("--- sensor ---");     builder.append("\nname: ");     sensor sensor = event.sensor;     builder.append(sensor.getname());     builder.append("\ntype: ");     builder.append(sensor.gettype());     builder.append("\nvendor: ");     builder.append(sensor.getvendor());     builder.append("\nversion: ");     builder.append(sensor.getversion());     builder.append("\nmaximum range: ");     builder.append(sensor.getmaximumrange());     builder.append("\npower: ");     builder.append(sensor.getpower());     builder.append("\nresolution: ");     builder.append(sensor.getresolution());      builder.append("\n\n--- event ---");     builder.append("\naccuracy: ");     builder.append(event.accuracy);     builder.append("\ntimestamp: ");     builder.append(event.timestamp);     builder.append("\nvalues:\n");     (int = 0; < event.values.length; i++) {         // ...         builder.append("   [");         builder.append(i);         builder.append("] = ");         builder.append(event.values[i]);         builder.append("\n");     }      log.d(tag, builder.tostring()); }  @override public void onaccuracychanged(sensor sensor, int accuracy) {     // todo auto-generated method stub  }  /* sensor processing/rotation matrix  * each time sensor update happens onsensorchanged method called.   * receive raw sensor data.  * first of want take sensor data accelerometer , magnetometer , smooth out reduce jitters.  * there can call getrotationmatrix function our smoothed accelerometer , magnetometer data.  * rotation matrix outputs mapped have y axis pointing out top of phone, when phone flat on table facing north, read {0,0,0}.  * need read {0,0,0} when pointing north, sitting vertical. achieve remap co-ordinates system x axis negative.  * following code example shows how acheived.   */ @override public void onsensorchanged(sensorevent event) {      if (event.accuracy == sensormanager.sensor_status_unreliable) {         return;     }      loadnewsensordata(event);     int type=event.sensor.gettype();      if (maccelgravitydata != null && mgeomagneticdata != null) {          if ((type==sensor.type_magnetic_field) || (type==sensor.type_accelerometer)) {             rootmeansquarebuffer(bufferedaccelgdata, maccelgravitydata);             rootmeansquarebuffer(bufferedmagnetdata, mgeomagneticdata);             if (sensormanager.getrotationmatrix(mrotationmatrix, null, bufferedaccelgdata, bufferedmagnetdata)){                  display display = mwindowmanager.getdefaultdisplay();                 int orientation = getscreenorientation(display);                 int rotation = display.getrotation();                  boolean dontremapcoordinates  = (orientation == configuration.orientation_landscape && rotation == surface.rotation_0) ||                         (orientation == configuration.orientation_landscape && rotation == surface.rotation_180) ||                         (orientation == configuration.orientation_portrait && rotation == surface.rotation_90) ||                         (orientation == configuration.orientation_portrait && rotation == surface.rotation_270);                  if( !dontremapcoordinates){                                     sensormanager.remapcoordinatesystem(                                             mrotationmatrix,                                             sensormanager.axis_y,                                              sensormanager.axis_minus_x,                                             mrotationmatrix);                 }                 debugsensordata(event);              }         }            }  } }