Office Hours — Today, March 23
| Mar 23 | 7:55 PM |
| Mark M. | has entered the room |
| Mark M. | turned on guest access |
| Mar 23 | 8:00 PM |
| Jonathan | has entered the room |
| Mark M. |
howdy!
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| Jonathan |
Hello Mark!
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| Jonathan |
I have an app that has quite a bit of audio content
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| Jonathan |
I plan on deploying the audio to the sdcard by downloading from the net
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| Mark M. |
OK
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| Jonathan |
but I want to encrypt it on the card and decrypt it in the app before playback
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| Jonathan |
(it would come from the net encrypted)
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| Jonathan |
how do I do this securely? If I store the key in the program, can it be obtained by examining the apk file?
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| Mark M. |
yes
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| Mark M. |
basically, you're trying to do DRM
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| Jonathan |
yup
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| Mark M. |
that's the sort of thing that really big businesses try to do...and they get hacked quickly
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| Jonathan |
haha
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| Mark M. |
so, I don't know of a solution here
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| Jonathan |
Okey doke.
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| Mar 23 | 8:05 PM |
| Mark M. |
sorry
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| Jonathan |
No worries. I thought it might be like that...
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| Mar 23 | 8:10 PM |
| Jonathan |
Thanks
for your help. I'm going to look through my notes and see if I can boil
down my other issues into some questions before office hours are over.
:)
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| Mark M. |
ok
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| Mar 23 | 8:25 PM |
| Jonathan |
I
spent quite a bit of time wrestling with the MediaPlayer and getting
into trouble with making calls to the MediaPlayer in the wrong state. I
admit that most of my problems come from the fact that I have not yet
implemented all the Listeners for the MediaPlayer to keep track of
state.
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| Jonathan |
Do you have any advice on how to handle a MediaPlayer which will play multiple clips from a loop within an AsyncTask?
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| Mark M. |
Um
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| Mark M. |
the clips are sequential?
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| Jonathan |
Yes, sequential.
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| Jonathan |
I call play, then sleep the AsyncTask
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| Mark M. |
the completion listener should cover it, then
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| Mark M. |
ick
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| Mark M. |
not a big fan of sleep()
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| Mark M. |
Have AsyncTask kick off the first clip
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| Jonathan |
:) What would you reccomend?
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| Mark M. |
have the completion listener kick off the next cliip
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| Mark M. |
er, clip
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| Mark M. |
only have the AsyncTask start your playback chain -- let each clip's completion start up the next
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| Mar 23 | 8:30 PM |
| Jonathan |
AsyncTask is iterating through several of these playback groups
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| Jonathan |
hence the sleep.
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| Mark M. |
I don't see why that matters
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| Mark M. |
whether is is two clips or 20, they're all in sequence, right?
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| Jonathan |
I'm thinking...
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| Jonathan |
slowly.... :)
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| Mark M. |
I figured you were on dialup... :-)
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| Jonathan |
LOL
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| Mar 23 | 8:35 PM |
| Jonathan |
It's a yoga app
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| Jonathan |
playing audio per pose
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| Jonathan |
with various ammounts of time per pose
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| Mark M. |
ok
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| Jonathan |
defined by the user.
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| Jonathan |
so sometimes all we can do is say the nae before it's time to transition to the next pose
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| Mark M. |
"say the nae"?
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| Mark M. |
is this is Scottish yoga app?
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| Jonathan |
name
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| Jonathan |
haha
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| Jonathan |
other times we have more time available to give pointers or goals for the pose. intructions,if you will
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| Mark M. |
ok
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| Mark M. |
user queues up a set of positions and goes through them?
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| Jonathan |
It's nice to have some silence too. :)
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| Mark M. |
s/positions/poses/
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| Jonathan |
yes
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| Mark M. |
ok, here's how I'd do it
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| Jonathan |
with times per pose
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| Mark M. |
Step #1: In the activity, when the user says "start", you do two things
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| Mark M. |
Step #1a: you start playing back the first clip in the set for this pose
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| Mark M. |
Step #1b: you call postDelayed() on a Handler or View to be notified when the user's chosen time for the pose ends
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| Mark M. |
Step #2: in the completion listener for the MediaPlayer, if there are more clips in this set, start the next clip
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| Mark M. |
Step
#3: in the Runnable you passed to postDelayed(), you stop and reset the
MediaPlayer, kick off the clip for the 2nd pose, and postDelayed() the
Runnable for the 2nd pose's time
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| Mark M. |
Step #4: lather, rinse, repeat
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| Mark M. |
no AsyncTask, no sleep()
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| Mar 23 | 8:40 PM |
| Jonathan |
OK.
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| Jonathan |
We stop the MediaPlayer in the postDelayed() Runnable in case we've played the audio past our poses time limit, yes?
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| Mark M. |
yes
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| Mark M. |
this way, the audio ends either when you run out of clips for the pose, or the pose's user-set time ends, whichever comes first
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| Jonathan |
Okey dokey. I'll mull this over.
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| Jonathan |
yes
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| Jonathan |
Great, thanks again!
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| Mark M. |
happy to help
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| Mar 23 | 8:45 PM |
| Jonathan |
I
have to tell you that I just recently bought my subscription and it was
these office hours that convinced me. What a great idea!!
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| Mark M. |
I just keep trying to add value
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| Mark M. |
which reminds me, the next edition of the Advanced Android book rolls out tomorrow, barring unforeseen problems
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| Jonathan |
That and the fact that almost every time I search for something android related you're the one giving the solution. :)
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| Jonathan |
ooh, great!
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| Jonathan |
OK, I have lots to re-write now, so I'll say goodbye. :) Have a great night!
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| Mark M. |
you too
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| Mar 23 | 8:50 PM |
| Jonathan | has left the room |
| Mark M. | turned off guest access |
Office Hours
People in this transcript
- Jonathan
- Mark Murphy