float accX = Gdx.input.getAccelerometerX(),
            accY = Gdx.input.getAccelerometerY(),
            accZ = Gdx.input.getAccelerometerZ();

    float moduleValue = (float) Math.sqrt(accX * accX + accY * accY + accZ * accZ);

    //Here I do the gravity compensation
    accX /= moduleValue;
    accY /= moduleValue;
    accZ /= moduleValue;

    float xRotation = (float) Math.atan2(accY, accZ) * MathUtils.radiansToDegrees,
            zRotation = (float) Math.atan2(accY, accX) * MathUtils.radiansToDegrees;