Application working in local build, but not working in Live Environment(Production)

Question

Hello, I am facing a problem with my native android application. Everything works fine when I am testing my app through local build apk in android studio. But the same application is not working properly in production(in play store). It was working fine few months ago, it suddenly started having issue in production. I have checked the logs of live app in android studio logcat by connecting the live app with android studio through USB cable, it shows some information and i can see that api is getting called and the response of the api is there, but screen doesn't move to next screen. At one other place i got an NullPointerException on an api call then i checked the same on local build and I did not got any NullPointerException.

Please suggest what should i do in order to resolve this issue i am facing with my app in production. Any suggestion or solution will be of great help, Thanks in advance.

chales_smith · Answer

Time for testing and find the bugs :)

Umang Upadhyay · Answer

I have tested the local build and it is working fine and for live app testing i have checked the logs and there is limited information in logcat, if you have any suggestions on how can i retrieve more information about the issue through logcat on android studio or what else i can try, please do tell.

James Watson · Answer

It seems that the problem is that API call which returned NullPointerException. 
First of all, investigate and clarify what the difference between the responses of this API to the two calling methods is.
For example, is some api temporarily unavailable from outside your LAN? ......

Umang Upadhyay · Answer

Thanks @James Watson for responding. The response i am getting in logs for the api is same as when i call the api from POSTMAN.

James Watson · Answer

You may write more logs in your web api codes in order to find why it will throw NullPointerException.

Umang Upadhyay · Answer

Hey @James Watson can this be a problem related to proguard rules, I have proguard enable in my project but haven't added any rules in the proguard-rules.pro file. Should I add rules related to retrofit,okhttp etc.

James Watson · Answer

> [[cite Umang Upadhyay]]
>
> Hey @James Watson can this be a problem related to proguard rules, I have proguard enable in my project but haven't added any rules in the proguard-rules.pro file. Should I add rules related to retrofit,okhttp etc.

I don't think this has anything to do with your issues.

In summary, now you have two questions in your production app as below, right?

1. A web api (A) is getting called and the response of this api is there, but the activity doesn't change accordingly yet.
2. You will get an NullPointerException on another web api call (B).

Umang Upadhyay · Answer

> [[cite James Watson]]
>
> > [[cite Umang Upadhyay]]
> >
> > Hey @James Watson can this be a problem related to proguard rules, I have proguard enable in my project but haven't added any rules in the proguard-rules.pro file. Should I add rules related to retrofit,okhttp etc.
> 
> I don't think this has anything to do with your issues.
> 
> In summary, now you have two questions in your production app as below, right?
> 
> 1. A web api (A) is getting called and the response of this api is there, but the activity doesn't change accordingly yet.
> 2. You will get an NullPointerException on another web api call (B).


Yes these are the problems i am facing and it is not just 2 apis, in whole application i am facing the problem apis are getting called 2 apis are giving NullPointerException , others are not. And also in those which are giving NPE the response is there, api is executed successfully after that logs are showing NPE.

James Watson · Answer

> [[cite Umang Upadhyay]]
>
> > [[cite James Watson]]
> >
> > > [[cite Umang Upadhyay]]
> > >
> > > Hey @James Watson can this be a problem related to proguard rules, I have proguard enable in my project but haven't added any rules in the proguard-rules.pro file. Should I add rules related to retrofit,okhttp etc.
> > 
> > I don't think this has anything to do with your issues.
> > 
> > In summary, now you have two questions in your production app as below, right?
> > 
> > 1. A web api (A) is getting called and the response of this api is there, but the activity doesn't change accordingly yet.
> > 2. You will get an NullPointerException on another web api call (B).
> 
> 
> Yes these are the problems i am facing and it is not just 2 apis, in whole application i am facing the problem apis are getting called 2 apis are giving NullPointerException , others are not. And also in those which are giving NPE the response is there, api is executed successfully after that logs are showing NPE.
> 
> 

I think you should add more logs in the codes of your app and those suspicious web apis. Thus you will figure out why the activity didn't change and why those API calls throwed NullPointerExceptions.

On the other hand, you may post some code snippets as well as other detailed information on the stackoverflow community for help.

Umang Upadhyay · Answer

> [[cite James Watson]]

Ok, thank you for your valuable advice it is a great help for me.

James Watson · Answer

> [[cite Umang Upadhyay]]
>
> > [[cite James Watson]]
> 
> Ok, thank you for your valuable advice it is a great help for me.

You are welcome, we all should help each other. (smug)