Hey Mark

hello, Emmanuel!

how can I help you today?

Ok, so I have a question regarding memory leaks

I know that when you declare a Handler as an anonymous inner class of an Activity, you are going to leak it because the inner class holds a reference of its enclosing type

this happens, in my understanding because all Loopers share the same MessageQueue

my question is:

can you also leak an Activity with an anonymous inner OnClickListener, for example?

not usually

the problem is that the Handler is held onto by something that lives past the Activity

and if there's a way to make the Handler go away, I'm not familiar with it

I see

so, if you were to put an OnClickListener in a static data member, that would leak the listener and anything it can reach

and so if that's an anonymous inner class, you'd leak the outer class (e.g., the activity or fragment that created it)

but, usually we don't put an OnClickListener in a static data member

right

so just passing an anonymous inner OnClickListener, that is not a static member, will not leak the Activity

correct

thanks

if you have another question, go right ahead -- it's a quiet chat room tonight

there has been some discussion about this at work, and I wanted a trustful answer, lol

well I actually wanted to thank you for all your work with the Guide and SO

you are very welcoem

er, welcome

to give you a bit of perspective

I started learning how to code less than 2 years ago

and now I develop professionally

actually I am switching jobs in a week or so and moving to NYC

congratulations!

your book helped me a lot

hopefully I can go to one of your talks in NYC, if there are any

I am glad that you found it useful

I am taking a bit of a break from speaking after my events in October and November

so I do not have anything scheduled in NYC, sorry

well, but probably it will be more likely that you will go to NYC than to St. Louis

hopefully, lol

since I have never been to St. Louis, other than the airport, that's a fair assessment :-)

what do you think of Android 5.0? isn't material design too animation intensive?

Material Design is fine, I guess, for Android 5.0+, but I'm not a big fan of trying to emulate it on older devices

I agree

though the borderless buttons I'm seeing in 5.0 drive me up a wall

I haven't even really looked into the SDK in detail

hello, Gabriele!

I was expecting that Google would have a series of videos to teach us a bit more about Android 5.0

Emmanuel: they will probably release more DevBytes videos in the coming months

hi :)

but let me take a question from Gabriele, and I'll swing back to you in a bit

Gabriele: your turn! do you have a question?

I have a simple_list_item_single_choice listview with many lines (400-600 ~) and when I fast-scroll the listview, the device lags a bit, can I do something to increase its performance?

that's difficult to answer in the abstract

I'd use tools like Traceview to try to determine where your time is being spent

paying particular attention to your ListAdapter (e.g., getView())

I'm using the holder pattern, don't know if it's important

well, that will help a bit, but you'll want to see if anything related to it is showing up in Traceview as well

I will see inside with traceview then, thank you

also, check LogCat and see if you're getting GC-related log messages while the scrolling is going on (e.g., GC_FOR_ALLOC)

can I run it directly from android studio?

I don't think so

I think you'll have to open the Android Device Monitor, from the Tools > Android menu

ok, thank you Mark

Emmanuel: your turn! do you have another question?

Are you going to add Android 5.0 to the Guide?

sure

though, as usual, it will be in pieces

there is stuff from past versions I haven't gotten to either

will we see some 5.0 on the next release?

I am currently planning on a release in mid-November that will start covering 5.0

and more in future releases, in December and onward

great!

but it will not be until 2015 before I get to some of the bigger-ticket items, like RecyclerView

as I have very little time to work on this stuff here in the rest of 2014, due to presentations and training engagements

I can imagine

if either of you have a question, go right ahead

are you going to cover dependency injection libs?

Dagger, more specifically

no, in large part because I am not using them anywhere, so I lack experience in the subject

Hello

hello, CodeApprentice!

CodeApprentice: I'm kinda in free-for-all mode at the moment, so if you have a question, go right ahead!

Emmanuel told me you were online. Just wanted to drop in.

Not sure that I have any specific questions right now, though.

OK

if anyone has any questions, go right ahead

under Heap, from the emulator, I can read a lot of objects and a big percentage of usage (80-100%)

um, I'm sorry, but I don't know what "under Heap" means

the heap tab inside the monitor

I haven't been in that in a couple of years

("that" meaning the tab that you're referring to)

do you remember where I can see the time spent, Mark?

I can't find it

everything in Traceview is about the time spent

there is the timeline by thread at the top

there is the call tree at the bottom

poke through the call tree, looking for references to your ListAdapter and/or ViewHolder classes, and see how much time the reported methods on those are taking up

or, look for other things that seem out of place, in terms of the number of calls, the time taken, etc.

there's also a chapter in the book on Traceview, and another on jank, that might be of use in tracking down your problem

ok, thank you again, Mark

that is a wrap for today's chat

the transcript will be posted to http://commonsware.com/office-hours/ shortly

the next chat is Monday at 7:30pm US Eastern Time

have a pleasant day!