Simulate ambient temperature 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;

import java.util.Timer;
import java.util.TimerTask;

public class MainActivity extends AppCompatActivity {

    private Thermometer thermometer;
    private float temperature;
    private Timer timer;

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

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

    @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 unregisterAll() {
        timer.cancel();
    }

}