StartCoroutine (with WWW) does not work on Android but it does on the editor - Unity

Question

I am working on an application for my web service. I work with LitJson, I finished the application but at the moment of exporting it to test it in my android does not work related to WWW IEnumerators.

For example, a button that starts the session, only the function that calls the IEnumerator works, but the IEnumerator itself does not work, and I have checked it by placing an alert message that it creates for the application.

This is the function that the button calls:

public void LogIn() {
    UserName = GameObject.Find("inputUsuario").transform.GetChild(2).gameObject.GetComponent < Text > ().text;
    Password = GameObject.Find("inputPassword").transform.GetChild(2).gameObject.GetComponent < Text > ().text;
    Debug.Log("Username:" + UserName + "And Password:" + Password);
    StartCoroutine(LogInWWW());
}

And this is the IEnumerator:

public IEnumerator LogInWWW() {
    WWW www = new WWW(UrlLogin + "?userName=" + UserName + "&password=" + Password);
    yield return www;
    print(www.text);
    if (www.error == null) {
        ProcessjsonLogin(www.text);
    } else {
        Debug.Log("ERROR: " + www.error);
    }
}

I must add that there is no error in the debug console on Android. Also I must clarify that to the URL I have added the prefix "http://" since it is a solution that give in the questions that I have seen.

Answer 1

Well guys, sometimes the errors are rare but in short, I managed to get to the error thanks to "trial and error", the problem was that I tried to get the value of UserName and Password using GetChild, like the following code:

  `Password = GameObject.Find("inputPassword").transform.GetChild(2).gameObject.GetComponent<Text>().text;`

For some reason on Android the object does not exist, I learned this because I was testing until part of the code I got the problem. Then I decided to change the code to find the text in a more specific way, changing the text object by inputUserTextObj, the same with the Password object and changing the code by:

    UserName = GameObject.Find("inputUsuarioTextObj").gameObject.GetComponent<Text>().text;
    Password = GameObject.Find("inputPasswordTextObj").gameObject.GetComponent<Text>().text;

As I said, I knew that the problem was not the IEnumerator, but it seems too strange that Debugging did not show me any error since it was a typical error of "GameObject is Null" and I could even swear to them by my life that Debug the application and I never showed the said error

But hey, thank you very much for your time guys, really feel the support and forgive me for taking your time.

Answer 2

When you instantiate a new WWW(strung Url) it implicitly starts the request as well but it is not sync operation, it is async so you have to check www.isDone before you can use www.text. I think it works on Unity Editor properly because it just has a faster connection.

public IEnumerator Request(){
    using (var testRequest = new WWW(@"URL")) {
    var totalWaited = 0;
    var timeOuted = false;
    while (testRequest.isDone == false) {
        yield return new WaitForSeconds(1);
        totalWaited++;
        if (totalWaited > timeOutInSeconds) {
            timeOuted = true;
        }
    }
    if (timeOuted) { Debug.LogError("TimeOut"); yield break; }
    yield return testRequest.text;
}