how to measure ambient temperature in android

Question

I want to measure ambient temperature on android device. but my device doesn t include thermometer sensor. How can I measure it? Thanks.

Answer 1

this is a basic example of how to get the Ambient Temperature in Android:

import android.support.v7.app.AppCompatActivity;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Build;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;


public class MainActivity extends AppCompatActivity implements SensorEventListener {

    private TextView temperaturelabel;
    private SensorManager mSensorManager;
    private Sensor mTemperature;
    private final static String NOT_SUPPORTED_MESSAGE = "Sorry, sensor not available for this device.";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        temperaturelabel = (TextView) findViewById(R.id.myTemp);
        mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
        if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.ICE_CREAM_SANDWICH){
            mTemperature= mSensorManager.getDefaultSensor(Sensor.TYPE_AMBIENT_TEMPERATURE); // requires API level 14.
        }
        if (mTemperature == null) {             
            temperaturelabel.setText(NOT_SUPPORTED_MESSAGE);
        }       
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    protected void onResume() {
        super.onResume();
        mSensorManager.registerListener(this, mTemperature, SensorManager.SENSOR_DELAY_NORMAL);
    }

    @Override
    protected void onPause() {                 
        super.onPause();
        mSensorManager.unregisterListener(this);
    }


    @Override
    public void onSensorChanged(SensorEvent event) {
        float ambient_temperature = event.values[0];
        temperaturelabel.setText("Ambient Temperature:\n " + String.valueOf(ambient_temperature) + getResources().getString(R.string.celsius));     
    }

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {
        // Do something here if sensor accuracy changes.
    }
}

you can download the complete example from : https://github.com/Jorgesys/Android_Ambient_Temperature