obbLoader

using UnityEngine;
using System.Collections;

public class DownloadObbExample : MonoBehaviour {
    // http://yuandraismiraldi.net/code/2013/12/15/splitting-apk-to-expansion-package-for-google-play-in-unity-4
#if UNITY_ANDROID && !UNITY_EDITOR && USE_SPLIT_BINARY && !DONT_USE_SPLIT_BINARY
    /*
    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 {
            string 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), "Fetch OBBs"))
                    GooglePlayDownloader.FetchOBB();
        }

    }
    */
    private bool downloadStarted = false;

    void Start() {
        var expPath = GooglePlayDownloader.GetExpansionFilePath();
        if (expPath == null) {
            //EtceteraAndroid.showAlert ("Alert", "Storage is not available!","Ok");
            return;
        }
        string mainPath = GooglePlayDownloader.GetMainOBBPath(expPath);
        string patchPath = GooglePlayDownloader.GetPatchOBBPath(expPath);
        if (mainPath != null) {
            Application.LoadLevel(1);
        } else {
            GooglePlayDownloader.FetchOBB();
            StartCoroutine(loadLevel());
        }
    }

    void Update() {
        if (Input.GetKeyDown(KeyCode.Escape)) {
            Application.Quit();
        }
    }

    protected IEnumerator loadLevel() {
        var expPath = GooglePlayDownloader.GetExpansionFilePath();
        string mainPath;
        do {
            yield return new WaitForSeconds(0.5f);
            mainPath = GooglePlayDownloader.GetMainOBBPath(expPath);
        } while (mainPath == null);

        if (downloadStarted == false) {
            downloadStarted = true;

            string uri = "file://" + mainPath;
            WWW www = WWW.LoadFromCacheOrDownload(uri, 0);

            yield return www;

            if (www.error == null) {
                Application.LoadLevel(1);
            }
        } else {
            Application.LoadLevel(1);
        }
    }
#else
    void Start() {
        Application.LoadLevel(1);
    }

#endif
}