SensorManager.getRotationMatrix always return false on Android Emulator -

i try orientation on android emulator sensormanager.getorientation. before use sensormanager.getrotationmatrix rotation matrix, return false. here code of activity:

 public class mainactivity extends activity implements surfaceholder.callback,  view.onclicklistener{
  public final static string debug_tag = "mainactivity";  private sensormanager sensormanager; private surfaceview preview; private float[] mgravs; private float[] mgeomags; private float[] mrotationm; private float[] morientation;  private sensor maccelerometer; private sensor mmagneticfield;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     getwindow().addflags(windowmanager.layoutparams.flag_fullscreen);     requestwindowfeature(window.feature_no_title);      setcontentview(r.layout.activity_main);      preview = (surfaceview)findviewbyid(r.id.surfaceview1);      sensormanager = (sensormanager)getsystemservice(sensor_service);      maccelerometer = sensormanager.getdefaultsensor(sensor.type_accelerometer);     mmagneticfield = sensormanager.getdefaultsensor(sensor.type_magnetic_field);      mgravs = new float[3];     mgeomags = new float[3];     mrotationm = new float[16];     morientation = new float[3];      list<sensor> sensorlist = sensormanager.getsensorlist(sensor.type_all);     (int ni = 0; ni < sensorlist.size(); ni++) {         log.d(debug_tag, sensorlist.get(ni).getname());     } }  private sensoreventlistener sensoreventlistener = new sensoreventlistener() {     @override     public void onsensorchanged(sensorevent event)     {         synchronized (this) {             switch (event.sensor.gettype()) {             case sensor.type_accelerometer:                 system.arraycopy(event.values, 0, mgravs, 0, 3);                 break;             case sensor.type_magnetic_field:                 system.arraycopy(event.values, 0, mgeomags, 0, 3);                 break;             default:                 return;             }             if (mgravs != null && mgeomags != null) {                 boolean bsuccess = sensormanager.getrotationmatrix(mrotationm, null, mgravs, mgeomags);                 if (bsuccess) {                     sensormanager.getorientation(mrotationm, morientation);                 }             }         }     }      @override     public void onaccuracychanged(sensor sensor, int accuracy) {         // todo auto-generated method stub      } };  private boolean openhardware() {     sensormanager.registerlistener(sensoreventlistener, maccelerometer, sensormanager.sensor_delay_normal);     sensormanager.registerlistener(sensoreventlistener, mmagneticfield, sensormanager.sensor_delay_normal);     return true; }  private void closehardware() {     sensormanager.unregisterlistener(sensoreventlistener); }  @override protected void onresume() {     super.onresume();     openhardware(); }  @override protected void onpause() {     super.onpause();     closehardware(); }  @override protected void onstop() {     closehardware();     super.onstop(); }  } 

ok, problem occur because magnetic field sensor return [0.0, 0.0, 0.0]. how can make magnetic field sensor return else?

i had same problem. got false

this answer has helped me: https://stackoverflow.com/a/14224122/1549127