accelerometer - Android Sensors - Problem getting Proximity Sensor Values and problems with using different phones -

have done android dev in past has been while - want build app uses orientation , proximity sensors. so...

msensormanager = (sensormanager) getsystemservice(sensor_service);     msensormanager.registerlistener(this, msensormanager.getdefaultsensor(sensor.type_all) , sensormanager.sensor_delay_game); 

so set listener - listened sensors - wonder should listen two? (would save battery?)

sensor mysensor = event.sensor;     // if (mysensor.gettype() != sensor.type_orientation) return;     if (mysensor.gettype() == sensor.type_orientation)     {         float x = event.values[0];         float y = event.values[1];         float z = event.values[2];          tv.settext("rotation around x, azimuth = " + x);         tv1.settext("rotation around y, pitch = " + y);         tv2.settext("rotation around z, roll = " + z);     }     if (mysensor.gettype() == sensormanager.sensor_proximity)     {          float p = event.values[0];         tv3.settext("proximity = " + p);      } 

then in onsensorchanged - see above

on lg optimus 1 can display values in textviews of orientation sensor (this phone doesn't have proximity sensor)

but running same code on nexus 1 leads lovely blank screen!?

sorry long question! , if need more infor ask, lg phone 2.2 nexus 1 2.2.2 thanks,

david

you can use same listener sensors. if want listen multiple or sensors, need rewrite line:

msensormanager.registerlistener(this, msensormanager.getdefaultsensor(sensor.type_all) , sensormanager.sensor_delay_game); 

because actual implementation of getdefaultsensor(int type) returns 1 sensor, seen in source code:

public sensor getdefaultsensor(int type) {     // todo: need smarter, now, return 1st sensor     list<sensor> l = getsensorlist(type);     return l.isempty() ? null : l.get(0); }  public list<sensor> getsensorlist(int type) {     // cache returned lists first time     list<sensor> list;     final arraylist<sensor> fulllist = sfullsensorslist;     synchronized(fulllist) {         list = ssensorlistbytype.get(type);         if (list == null) {            if (type == sensor.type_all) {                list = fulllist;            } else {                 list = new arraylist<sensor>();                 (sensor : fulllist) {                      if (i.gettype() == type)                         list.add(i);                 }            }            list = collections.unmodifiablelist(list);            ssensorlistbytype.append(type, list);        }      return list; } 

so in case of sensor.type_all method getsensorlist(int type) provides (unordered) list of sensors available , getdefaultsensor(int type) returns first 1 of it.

because list containing sensors unordered, getdefaultsensor(sensor.type_all) supplies random sensor. tried , first got accelerometer , next time light sensor. since handle orientation , proximity changes in listener, suspect getdefaultsensor(sensor.type_all) supplied different sensor on nexus.

you should receive list of sensors available msensormanager.getsensorlist(sensor.type_all) , iterate on list, in order register every contained sensor respectively.

regarding question saving battery - don't know, if sensors running permanently. if case, 1 can save battery power reducing unnecessary processing. if not need information specific sensor provides, not register receive messages it. reduces messages being sent application.