re: I'm an Android Developer(Java/Kotlin), pre-middle level, Ask Me Anything! VIEW POST


Hello Dear!
How to upload image from camera to the server using php with retrofit?


You can read this article and this.


Hello Dear friend!
Thankyou for your help!
I want implement the architures components, i have already do the part of the local Backend(ROOM).I across a problem with the remote backend(retrofit)!
Please help me!

What's the problem?

this is the result from the Logcat:Attempt to invoke virtual method 'void android.arch.lifecycle.LiveData.observe(android.arch.lifecycle.LifecycleOwner, android.arch.lifecycle.Observer)' on a null object reference!

To help you I need more information. Can you paste your code to gist.github.com/
and tell me in which line of code you got this exception.

Seems like your user variable returned by getUser() method is null. Did you initialize it?

Yes i have initialise !
code in the Viewmodel Class:
public LiveData getUser(String username, String mdp)

return userrepository.getUser(username,mdp);

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