如何让类方法在后台工作？

问题就像 Headers 中的一样 . 如何获得onSensorChanged和onAccuracyChanged在后台工作？感谢帮助 .

public class MainActivity extends Activity implements SensorEventListener {

SensorManager sensorManager;
boolean running;

TextView tv_steps;
int mSteps;

TextView baza;
StepDatabase db;

    @Override
    protected void onCreate (Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        tv_steps = (TextView) findViewById(R.id.tv_steps);
        sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
        baza = (TextView) findViewById(R.id.baza);
        db = new StepDatabase(this);
        final Button button = findViewById(R.id.zeruj);
        button.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                // mSteps=0;
                printDatabase();
            }

        });

    }

    public void printDatabase ()
    {
        String dbString = db.readData();
        baza.setText(dbString);
    }

    @Override
    protected void onResume () {
        super.onResume();
        running = true;
        Sensor countSensor = sensorManager.getDefaultSensor(Sensor.TYPE_STEP_DETECTOR);
        if (countSensor != null) {
            sensorManager.registerListener(this, countSensor, SensorManager.SENSOR_DELAY_UI);
        } else {
            Toast.makeText(this, "Nie znaleziono sensora", Toast.LENGTH_SHORT).show();
        }
    }

    @Override
    protected void onPause ()
    {
        super.onPause();
        running = false;
    }


    @Override
    public void onSensorChanged(SensorEvent event) {
        if (running) {
            db.createStepsEntry();
            mSteps += event.values.length;
            tv_steps.setText((String.valueOf(mSteps)));
            //tv_steps.setText(String.valueOf(event.values[0]));
            printDatabase();
        }
    }

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

    }
}

我有和其他类StepDatabase一起将数据保存到数据库 . 如何使它在后台运行？我试着把它放在线程中，但它没有用 . 请给我一些建议 .