MainActivity.java

//initialize the library using api key
BarikoiTrace.initialize(this,"BARIKOI API KEY");

//create of log in user by name , email , phone number (phone numberis required, others are nullable)
BarikoiTrace.setOrCreateUser("NAME","EMAIL_ADDRESS","PHONE_NUMBER", new BarikoiTraceUserCallback() {
	@Override
	public void onFailure(BarikoiTraceError barikoiError) {
		Log.e("userfail", barikoiError.getMessage());
	}

	@Override
	public void onSuccess(BarikoiTraceUser traceUser) {

	}
});

//after login, get the user id 
if(BarikoiTrace.getUserId()!=null){
	Toast.makeText(this, "UserId: "+BarikoiTrace.getUserId(), Toast.LENGTH_SHORT).show();
}
else{
	Toast.makeText(this, "UserId: "+"null", Toast.LENGTH_SHORT).show();
}

//to enable offline tracking (track will be saved offline, and updated when device is online) 
BarikoiTrace.setOfflineTracking(true);

//For some specific manufacturer android phones, custom autostart permission is needed, to handle this, use the below function only once 
BarikoiTrace.checkAppServicePermission(this);

//to start tracking 
if ( BarikoiTrace.isLocationTracking()) {
    Log.d("locationupdate", "already running no need to start again");
    //System.out.println("already running no need to start again");
    Toast.makeText(getApplicationContext(), "trip already running!! no need to start again", Toast.LENGTH_SHORT).show();

  }  else if (!BarikoiTrace.isLocationPermissionsGranted()) {
    BarikoiTrace.requestLocationPermissions(MainActivity.this);
  } else if (!BarikoiTrace.isLocationSettingsOn()) {
    BarikoiTrace.requestLocationServices(MainActivity.this);
  } else {
    if (mode == null) mode = tb.build();
    BarikoiTrace.startTracking(mode);
}

// to stop tracking
BarikoiTrace.stopTracking();