hello, Carlos!

how can I help you today?

Hi Mark

Really quick question regarding Android back stack.

I've been having issues with my app, when I click home button (get away from my app) and if I press the app's launcher icon is starts at the home activity instead of the last activity I was in.

I'm using the standard launchMode (haven't override it in manifest, etc), so not sure why this is happening.

that's normal behavior if your process had been terminated (e.g., low memory conditions)

I even create a test app where all I do is called startActivity from one activity to the other and I see the same behavior

Based on the documentation, this might happen if the app has been in background for a long time or like you said...if there is low memory issues.

again, that's normal behavior, if your process had been terminated

there's also a developer option that controls this

However, in my case, I wait less than 5 seconds.

do you have "Don't keep activities" turned on in Developer Options?

I noticed that the Gmail app returns to the detail activity (email view). Do they hack around this by using TaskBuilder possible?

possibly?

I doubt it, as the home screen launcher icon does not know about what detail to show

unless they are persisting that somewhere

I checked that and it was turned off. I even tried with my old HTC incredible (2.3) who doesn't have that option and it still behaves the same.

:: shrug ::

Quit a few apps I personally use work as I expect (i.e. return to detail activity) so I'm clueless as to why this only happens with my own app, or the testcase app I created to debug this

to confirm I'm not insane, I just ran a test with one of the book examples

SO is flooded with "use singleTask launchMode" but this clearly is not the right solution.

worked as expected

from first activity, tap button to bring up second activity, press HOME, press launcher icon again, see the second activity (because the existing process is brought back to the foreground)

are you using the simulator?

so, try that sample

no, a Galaxy Nexus

Ok. I'll try your sample app.

if the sample works as expected, see what's different between it and your test case

The only scneario that was working fine for me was if I returned to the app from the "recent apps" window.

if the sample does not work as expected, then it's something about your environment, I guess

In that case it was returning to detail activity

the recent tasks list will take a shot at getting you back to the activity you had been on, even if the process went away (I think)

task management and the back stack is on my to-do list to run a zillion experiments and write up all the permutations

suffice it to say, I'm not looking forward to the experience

Thanks Mark. I'll give a shot to your app. This has been driving me crazy so at least you've confirm that it works for you as expected. I'll double-check the developer settings on my phone and see if Intellij forces the app to run in some sort of mode that doesn't keep the app's latest Task in the back stack.

ah, definitely test this sort of thing by *starting* with the app in the launcher, not as launched by an IDE

Eclipse, at least, does its own bit of funky stuff with respect to tasks

Good to know. Thanks again Mark. I'll give it a shot this evening. That was my only question for today.

BTW, for more on the IDE-launching problem: http://code.google.com/p/android/issues/detail?...

Cool. Thanks

if you come up with another question, feel free to chime in

Hello :) How are you? I took a training class with you in NY in May :)

hello, Olga!

I remember you!

YEY :)

how can I help you today?

so, I started writing the app for my company

using Viewpager and trying to use fragments(that's where it gets hairy)

I make a webservice call, get the data back, parse it and I'm displaying it but every page has the same data...i'm not really using Fragments...cause I need to create them based on the keys i get from JSON

i'm not sure how to do that...

don't set your PagerAdapter until you get back the JSON, have parsed it, and therefore can teach the PagerAdapter how many (and what) pages there are

I'm using Jackson

OK

so in my mainActivity...

how do I set up the fragments?

Can I upload my files, so you can point me in the right direction?

are you doing the Web service call and Jackson parsing in doInBackground() of a AsyncTask?

Yes

OK, then in onPostExecute(), call setAdapter() on the ViewPager

where you supply a PagerAdapter that has access to your JSON-parsed data model

so it knows how many pages there are, etc.

you don't have a ViewPager

but you are doing what I describe for your ListView

you are populating the ListView with the ListAdapter in onPostExecute()

along the same lines, if you are populating a ViewPager based upon JSON parsing, you would do that in onPostExecute() as well

that's what the EmPubLite tutorials demonstrated

we didn't populate the ViewPager until we loaded in the JSON (in that case, from an asset rather than a network call)

don't I need to use the PagerAdapter?

yes, you need to use a PagerAdapter with a ViewPager

just as EmPubLite did

so right now I'm kind of cheating...just passing the list and keeping track of index to display the doc in the onListItemClick()

so how do I change this whole thing around to use fragments? I need to display the list of dateDesc in the fragment and have as many pager_title_strip as i have Document Categories...

I can't really answer that question

but when then click, to load the correct url in the webview

I cannot really comment on your specific code

in fact, I'm going to have to do some work to rip those uploads out of the chat

since I'm assuming you don't want them on the public Internet

how do I setAdapter() on the ViewPager?

it's a method that you call

if you go back to Tutorial #12, you will see where we load the JSON and populate the pages of the ViewPager used to display the book

looking at it now :)

however, we have reached the end of today's chat

in the BookContents?

the BookContents is the POJO data model created out of the parsed JSON

this chat's transcript will be archived at http://commonsware.com/office-hours/ sometime soonish

the next chat is Thursday at 10am Eastern

have a pleasant day!

you 2