18 android apps to get you started

by bumi030207 » Sat, 27 Feb 2010 15:21:26 GMT

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 buat yang masih bingung milih apps apa kira2 yg kudu di install di robot ijo :))


*18 apps actually, not 12

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1. Task life cycle and activity launch mode question(s)

I read up on "tasks" and the activity life cycle.  Single top launch
mode seems to give me (in theory) what I'd like to have for my app,
but it's not currently working as expected.  It sounds simple enough,
so I can't imagine I'm doing this incorrectly.  From my understanding,
"single top" means that my activity can be navigated to in many ways,
but per Task it will act as a singleton instance moving it to the top
of the Task stack when launched.  Therefore, if I do either of the
following: declare the activity's launchMode to be singleTop in the
manifest OR launch my activity by intent with the
FLAG_ACTIVITY_SINGLE_TOP flag I will get this behavior.

I have tried both methods by themselves and both together, and I don't
get this behavior.  I have a very simple app with two Activities.
MainActivity is my "landing page" where a user can select an artist
and launch the ArtistActivity with that artist's id.  The user can
navigate back to the landing page with a menu item as well as the back
button.  If the user goes back and forth by menu item clicks, a stack
of activities seems to be built so that successively hitting the back
button will take them step by step backwards through the actions
they've taken.  I was under the impression that by declaring both
activities as android:launchMode="singleTop" and/or launching them
with the properly flagged intent (intent.addFlag
(Intent.FLAG_ACTIVITY_SINGLE_TOP), that hitting the back key would
only take them through an activity once before "exiting" (visually
hiding) the app.

Am I getting this wrong?  And if so (or not), how do I get my app with
only two activities to treat the activities as a stack where my
"landing page" (MainActivity) is always on the bottom?  Hitting Back
from MainActivity always exits (unloads/pauses?) the app (task?), and
hitting Back from ArtistActivity always returns to a singleton
instance of MainActivity.


2. Is there a list of standard Intent specifications?

I'm looking into getting my application to show up when the user tries
to 'share' a picture via the Gallery application I can't, however,
find any information about how exactly to go about this.

I get that I need to declare an intent filter for the SHARE action,
what I can't seem to find is how the Gallery wants to send out the
selected image.

documentation is key indeed.


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