WWW.progress not working on Android | iOS

Questions & Answers
1

Hello. I’m having difficulty tracking progress using a WWW class. On mobile platforms WWW.progress value does not change linearly, it is 0 (when loading) or 1 (when the finish).

On PC & MAC all Ok. I mean that the PC value goes smoothly from 0 to 1 (0.1 0.2 0.3 … 1). But on mobile platforms this is not happening! Is 0 or 1, no 0.2 0.4 etc… Rigidly 0 or 1. Help! Unity 4.3.0f4 Pro

using UnityEngine;
using System.Collections;

public class ExampleLoadingBundle : MonoBehaviour {
	public string url = "http://pancrucian.littleteam.ru/myAssetBundle.unity3d";
	public int version = 1; // The version of the AssetBundle
	
	public string assetName = "Object Name";
	public tk2dTextMesh textMesh;
	public AudioSource ObjInstance;

	void Start(){
		StartCoroutine(LoadBundle<AudioClip>(url, version,assetName));
	}

	public IEnumerator LoadBundle<T> (string url, int version, string assetName) where T : Object {
		using(WWW download = WWW.LoadFromCacheOrDownload(url, version)){
			while(!download.isDone) {				
				textMesh.text = download.progress.ToString(); // THIS PART NOT WORKING, PROGRESS ALWAYS 0 THEN 1 IF download.isDone
				textMesh.Commit();
				yield return 0;
			}
			yield return download;
			if (download.error != null) {
				textMesh.text = download.error;
				download.Dispose();
				textMesh.Commit ();
				yield break;
			}
			
			AssetBundle assetBundle = download.assetBundle;
			download.Dispose();
			
			if (assetName == "" || assetName == null)
				ObjInstance.clip = (AudioClip)assetBundle.mainAsset;
			else
				ObjInstance.clip = (AudioClip)assetBundle.Load(assetName, typeof(T));
			
			assetBundle.Unload(false);
		}
		ObjInstance.Play();
	}
}
2

Thx this guy Unity ID

Typically you see this behaviour when the server is returning bad header information. If it’s not returning a content length, Unity has no way of giving you progress, since progress is a percentage of the total content length.

Server code:

$attachment_location = 'files/myAssetBundle.unity3d';
header($_SERVER["SERVER_PROTOCOL"] . " 200 OK");
header("Cache-Control: public");
header("Content-Type: application/zip");
header("Content-Transfer-Encoding: Binary");
header("Content-Length:".filesize($attachment_location));
header("Content-Disposition: attachment; filename=myAssetBundle.unity3d");
readfile($attachment_location);
Die();

And now all working great! ;p