Main Activity for the Thermometer tutorial on the SSaurel's Channel

MainActivity.java

package com.ssaurel.mythermometer;

import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.Toast;


public class MainActivity extends AppCompatActivity implements SensorEventListener {

    private SensorManager sensorManager;
    private Thermometer thermometer;
    private float temperature;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        thermometer = (Thermometer) findViewById(R.id.thermometer);
        sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
    }

    @Override
    protected void onResume() {
        super.onResume();
        loadAmbientTemperature();
    }

    @Override
    protected void onPause() {
        super.onPause();
        unregisterAll();
    }

    private void simulateAmbientTemperature() {
        timer = new Timer();

        timer.scheduleAtFixedRate(new TimerTask() {

            @Override
            public void run() {
                temperature = Utils.randInt(-10, 35);

                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        thermometer.setCurrentTemp(temperature);
                        getSupportActionBar().setTitle(getString(R.string.app_name) + " : " + temperature);
                    }
                });
            }
        }, 0, 3500);
    }

    private void loadAmbientTemperature() {
        Sensor sensor = sensorManager.getDefaultSensor(Sensor.TYPE_AMBIENT_TEMPERATURE);

        if (sensor != null) {
            sensorManager.registerListener(this, sensor, SensorManager.SENSOR_DELAY_FASTEST);
        } else {
            Toast.makeText(this, "No Ambient Temperature Sensor !", Toast.LENGTH_LONG).show();
        }
    }

    private void unregisterAll() {
        sensorManager.unregisterListener(this);
    }

    @Override
    public void onSensorChanged(SensorEvent sensorEvent) {
        if (sensorEvent.values.length > 0) {
            temperature = sensorEvent.values[0];
            thermometer.setCurrentTemp(temperature);
            getSupportActionBar().setTitle(getString(R.string.app_name) + " : " + temperature);
        }
    }

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

    }
}