Temperature sensor on Android

Question

 public class MainActivity extends Activity implements SensorEventListener { private TextView temperaturelabel; private SensorManager sensormanager; private Sensor temperature; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); temperaturelabel = (TextView) findViewById(R.id.text); sensormanager = (SensorManager)getSystemService(SENSOR_SERVICE); temperature= sensormanager.getDefaultSensor(Sensor.TYPE_AMBIENT_TEMPERATURE); temperaturelabel.setText(""+temperature.getPower()); } protected void onResume() { super.onResume(); sensormanager.registerListener(this, temperature, SensorManager.SENSOR_DELAY_FASTEST); } protected void onPause() { super.onPause(); sensormanager.unregisterListener(this); } public void onAccuracyChanged(Sensor sensor, int accuracy) {} public void onSensorChanged(SensorEvent event) { if (event.sensor.getType() != Sensor.TYPE_AMBIENT_TEMPERATURE) return; temperaturelabel.setText(""+temperature.getPower()); } }

I want to get temperature from the device.

I wrote this code and I have tried it on HTC One X, but it didn't work.

of course. I installed temperature program from googleplay. it works. — Furkan
– Furkan, Commented Aug 14, 2012 at 9:51
Most of these programs get the temperature from the internet by sending you current position to a server. — nkr
– nkr, Commented Aug 14, 2012 at 9:51

Jviaches · Accepted Answer · 2012-08-14 09:53:53Z

7

A far as specification of htc one x says, its looks like this device doesn't have temperature sensor.

Take a look in its official specifications.

answered Aug 14, 2012 at 9:53

Jviaches

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AndroidCrazy Over a year ago

There is a app in the android market called "Andro Sensor" which will give you the info of available and un-available sensors for your device .Try it

tpcz · Accepted Answer · 2014-04-03 08:58:53Z

At the moment, only few devices have temperature sensor (e.g, Samsung S4).

You should always test if sensor is available, i.e., {

temperatureSensor = sensormanager.getDefaultSensor(Sensor.TYPE_AMBIENT_TEMPERATURE) if (temperatureSensor != null) { /* register listener and do other magic... */ }

What you can do on HTC, is to find some other thermistor in the system and read sysfs path, where its value is exposed, e.g., thermistor in battery or in pressure sensor, if there is any in this phone.

Drawback of this approach is that these are raw thermistor values - sometimes you have to know, how to convert them to degrees of celsius and what's worse, they are not compensated (as the temperature from API is) - so e.g, if the phone will run some computation and processor will heat up the phone, that value can be easily 10 degreess higher than Ambient temperature and thus not really useful...

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