Any idea why the following adjusted DownloadOBBExample script works only in some devices?

Questions & Answers
1

Hi,

Doing some OBB-related testing with a couple of minimal, barebone scenes. Could anyone give us pointers as to why the following script (based on DownloadOBBExample included in Unity’s plugin intended for OBB use) works in some Android devices (e.g. Huawei Honor 7, Samsung Trend+), but not in some others (e.g. Huawei P7 Lite)?

We have a test app in Google Play Store and in the devices where it works, the simple scene 1 opens after you press the button (referred to in the script), but in some other devices the scene does not open. Any pointers are highly appreciated as we don’t have any expertise for this kind of issue.

The script:

using UnityEngine;
using UnityEngine.SceneManagement;
using System.Collections;

public class DownloadObbExample : MonoBehaviour
{

string mainPath = "";

void OnGUI()
{
    if (!GooglePlayDownloader.RunningOnAndroid())
    {
        GUI.Label(new Rect(10, 10, Screen.width - 10, 20), "Use GooglePlayDownloader only on Android device!");
        return;
    }

    string expPath = GooglePlayDownloader.GetExpansionFilePath();
    if (expPath == null)
    {
        GUI.Label(new Rect(10, 10, Screen.width - 10, 20), "External storage is not available!");
    }
    else
    {
        mainPath = GooglePlayDownloader.GetMainOBBPath(expPath);
        string patchPath = GooglePlayDownloader.GetPatchOBBPath(expPath);

        GUI.Label(new Rect(10, 10, Screen.width - 10, 20), "Main = ..." + (mainPath == null ? " NOT AVAILABLE" : mainPath.Substring(expPath.Length)));
        GUI.Label(new Rect(10, 25, Screen.width - 10, 20), "Patch = ..." + (patchPath == null ? " NOT AVAILABLE" : patchPath.Substring(expPath.Length)));
        if (mainPath == null || patchPath == null)
            if (GUI.Button(new Rect(10, 100, 100, 100), "Move to scene 1"))
                StartCoroutine(loadLevel());
            

    }

}

void Update()
{

}

protected IEnumerator loadLevel()
{
    string uri = "file://" + mainPath;

    WWW www = WWW.LoadFromCacheOrDownload(uri, 0);

    yield return www;

    if (www.error != null)
    {
     //   log("wwww error " + www.error);
    }
    else
    {
        SceneManager.LoadScene("Test");
    }

}

}

2

Hi,

Happy to say, the issue seems to have been solved. Not sure where the problem really originates from, our limited knowledge related to this or something else, but the internal obb loading was often interrupted (seen from the www object’s bytesDownloaded), yet the following code addition did the trick (variable declarations not included). It seems that calling the loadscene “again” when the previous www process is still taking place causes the loading process to actually succeed in the range of test devices we have:

void Update()
{
    if (tryagain || (errorcount % 4) == 0)      
    {
        tryagain = false;
        errorcount++;
        StartCoroutine(loadLevel());
    }
}