Android life cycle accelerometer and gyroscope

[jdwieber]

Hello,

I'm working on a mobile game that uses the accelerometer and gyroscope. When deployed to an android device, the game works well in the beginning. However, if the device sleeps, when I wake it up and try to continue playing the gyroscope, and accelerometer both stop working. Is there a way to hook into the android life cycle functions without writing a custom activity? The script that I'm using to update the gravity direction is below. It's very simple and does the job, until the phone sleeps. Also, can I provide a custom manifest without overriding the default unity activity (for using-permissions)?

using UnityEngine;
using System.Collections;
 
public class GravityDirectionUpdater : MonoBehaviour
{
    private static Quaternion m_quat;
    public float m_gravity = -29.8f;
 
    // Use this for initialization
    void Start ()
    {
        //Doesn't always work unless I put this here.
        Input.gyro.enabled = true;
 
        //TODO: reorient camera in scene to avoid transforming frame in scripts
        m_quat = Quaternion.AngleAxis ( -90, Vector3.up ) *
                 Quaternion.AngleAxis ( -90, Vector3.forward ) *
                 Quaternion.AngleAxis ( -90, Vector3.left );
    }
 
    // Update is called once per frame
    void Update ()
    {
        //I always see this, even after waking up
        Debug.Log ( "Updat gyro.enabled: " + Input.gyro.enabled.ToString () );
 
        //This makes no difference here
        Input.gyro.enabled = true;
 
        Physics.gravity = m_quat * ( Input.gyro.gravity.normalized * m_gravity );
 
    }
}

[szi_John]

Have you tried turning off sleep?

Screen.sleepTimeout = -1;

May not suit your exact app but...

[jdwieber]

Hi John,
Thanks for the suggestion. It does prevent the problem and the annoyance of the screen dimming during play. The only thing I did different is that I used the unity constant.

 Screen.sleepTimeout = SleepTimeout.NeverSleep;

Cheers