Sample for Reading Sensor Value on Android

SensorActivity

import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorEventListener2;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.app.Activity;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.TextView;

public class SensorActivity extends AppCompatActivity{

    private static final String TAG = SensorActivity.class.getSimpleName();
    private SensorManager mSensorManager;
    private Sensor mPressure;
    private Sensor mTemperature;
    private TextView mTextViewPressure;
    private TextView mTextViewTemperature;
    private SensorEventListener mPressureListener;
    private SensorEventListener mTemperatureListener;
    private Sensor mHumidity;
    private SensorEventListener mHumidityListener;

    @Override
    public final void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sensor);

        // Get an instance of the sensor service, and use that to get an instance of
        // a particular sensor.
        mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
        mPressure = mSensorManager.getDefaultSensor(Sensor.TYPE_PRESSURE);
        mTemperature = mSensorManager.getDefaultSensor(Sensor.TYPE_AMBIENT_TEMPERATURE);
        mHumidity = mSensorManager.getDefaultSensor(Sensor.TYPE_RELATIVE_HUMIDITY);

        mTextViewPressure = (TextView) findViewById(R.id.text_view_pressure);
        mTextViewTemperature = (TextView) findViewById(R.id.text_view_temperature);

        mHumidityListener = new SensorEventListener() {
            @Override
            public void onSensorChanged(SensorEvent event) {
                float humidity = event.values[0];
                // Do something with this sensor data.

                Log.d(TAG, "Humidity: " + String.valueOf(humidity) + "%");
//                mTextViewTemperature.setText(String.valueOf(temperature_value));
            }

            @Override
            public void onAccuracyChanged(Sensor sensor, int accuracy) {

            }
        };

        mTemperatureListener = new SensorEventListener() {
            @Override
            public void onSensorChanged(SensorEvent event) {
                float temperature_value = event.values[0];
                // Do something with this sensor data.

                Log.d(TAG, "Temperature: " + String.valueOf(temperature_value));
                mTextViewTemperature.setText(String.valueOf(temperature_value));
            }

            @Override
            public void onAccuracyChanged(Sensor sensor, int accuracy) {

            }
        };

        mPressureListener = new SensorEventListener() {
            @Override
            public void onSensorChanged(SensorEvent event) {

                float millibars_of_pressure = event.values[0];
                // Do something with this sensor data.

                Log.d(TAG, "Pressure: " + String.valueOf(millibars_of_pressure));
                mTextViewPressure.setText(String.valueOf(millibars_of_pressure));
            }

            @Override
            public void onAccuracyChanged(Sensor sensor, int accuracy) {

            }
        };
    }



    @Override
    protected void onResume() {
        // Register a listener for the sensor.
        super.onResume();
        mSensorManager.registerListener(mTemperatureListener, mTemperature, SensorManager.SENSOR_DELAY_NORMAL);
        mSensorManager.registerListener(mHumidityListener, mHumidity, SensorManager.SENSOR_DELAY_NORMAL);
        mSensorManager.registerListener(mPressureListener, mPressure, SensorManager.SENSOR_DELAY_NORMAL);
    }

    @Override
    protected void onPause() {
        // Be sure to unregister the sensor when the activity pauses.
        super.onPause();
        mSensorManager.unregisterListener(mPressureListener);
        mSensorManager.unregisterListener(mHumidityListener);
        mSensorManager.unregisterListener(mTemperatureListener);
    }
}