hello, Aaron!

how can I help you today?

hey Mark, hope you are well, just a few questions today

in Android Studio there seem to be two global find dialogs, Ctrl-Shift-F, and double-Shift. Can't really tell what the difference is supposed to be and Google didn't help much...

well, since I used Ctrl-Shift-F for the first time based on your question, I'm not the best person to answer that question :-)

lol, ok no worries

looks like Ctrl-Shift-F offers free-text search, while double-shift is for filenames and class names (mostly)

second, my AVD is a Nexus 4 running 8.1 w/ Google APIs, and it seems like anytime I use WebView at all, I get this error, which Google also doesn't help much with:

E/chromium: [ERROR:gl_surface_egl.cc(289)] eglChooseConfig failed with error EGL_SUCCESS

does that mean anything to you? any suggestion on where to research, besides asking on SO?

ignore it

the Chromium engine logs stuff because it's lonely or something

I see. I thought that might be the case, given that the error message is...success

everybody gets those, and unless you have concrete problems, just assume that the Chromium team really likes the error severity, and move on

OK

last question for today is implementation-specific w/r/t the app I am continuing to work on

are you familiar with Reddit just as a user?

barely

I'm not a member

ok

I occasionally wind up on a page there due to some search result or link

no worries, i'll just add more context

my app is a master/detail setup basically. RecyclerView that loads in the front page of Reddit posts (25 posts by default) through LiveData w/ Retrofit, which all comes from one API call.

OK

clicking a row loads a detail view in a fragment, which displays a larger image thumbnail associated with that post, if one exists, any post text, if it exists, and the three most highly-rated comments on the post

OK

the thumbnail and post text all are extracted from the data I get back from the API call, however the comments have to be downloaded with a separate call for each post

Reddit needs a new API, but OK

haha, yeah may be, in any case, each post has an ID that has to be piped into the second call to download the comments for it

so basically in my click listener for the RecyclerView, I do 2 things: kick off the Retrofit call and launch the new fragment

the way I'm doing it now,

I have only a single LiveData, call it commentsLiveData, and every time the user clicks a different post, I send that post ID to Retrofit and it loads the new comments into the LiveData

so it's not wrapping a single data source over time... instead the source is actually changing

OK

this is causing a problem, because each time a new detail-view fragment is kicked off, the onChanged call that happens after subscription occurs before the Retrofit call reloads the LiveData

so you click post 1, then go back and click post 2, you will see the comments from post 1 for about a second on the post 2 detail page

while the Retrofit call is finishing

that's no good

I suspect I'm abusing LiveData by using it this way

but lacking alternate ideas

off the cuff, two instances of your detail fragment should not be sharing the single LiveData

does that all make sense? I'd post code but it's a mess

if you're using the Architecture Components' ViewModel system, each of those fragment instances would have its own ViewModel with its own LiveData

hmm, ok I've misunderstood something then

that's a good starting point though, I will research along those lines and see where that gets me

are you using ViewModel, or are you managing your LiveData some other way?

yeah, I am using ViewModel, I'm not even really sure I am using it correctly though. All it's really doing is chaining via SwitchMap to the LiveData exposed by my repository where all the HTTP calls are happening

I mean, I can link you to the current code on Github if you like, but it might be better if I come back with that later after I get a chance to refactor

that's your call

however, if you are using ViewModel, for the purposes of this LiveData, you'd want two ViewModel instances, each with its own LiveData from the repository

that might be in addition to a separate ViewModel that the fragments share with their hosting activity

OK, I think that gives me enough to start a new line of inquiry that might lead to a solution

I will probably ask you to for a mini-code review once I've gotten it more cleaned up, but at this point I just don't think it would be an efficient or respectful use of anyone's time to look at

OK

thinking if I have any follow up questions

no, I'll let you go for now and keep working on it

thanks!

you're welcome!