Hello,
I am (finally) getting around to developing my first android app. It's nothing exciting, starting off as a catalogue and some other things.
I have set up the main activity with four tabs within the first tab I have three spinners. The first spinner is meant to let the user select a car manufacturer, the second spinner is meant to show models of that manufacturer and the third spinner shows editions. An example would be:
Manufacturer:
Vauxhall
Model:
Corsa
Edition:
2000+
I was wondering what the easiest way to dynamically change the contents would be? Right now I have one adapter created for each manufacturer with a setOnItemSelectedListener that changes the adapter based on which manufacturer was selected. I don't think this is the most efficient or tidy method though. Also, for a list of 60 odd manufacturers it's a pain to write.
Thanks guys! (and girls)
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We have a Service with some threads dedicated to network communication. It's heartbeat-type traffic - a quick request-response a couple of times a second with small amounts of data. The problem is that a thread sometimes just stops being run for 20 or more seconds when a network request is made (that's based on calling System.currentTimeMillis() at the start and finish of the network request, and I know from measurements on the server side that the request was completed in a fraction of a second).
The advice out there suggests setting thread priorities using the Android-specific API and/or the pure Java API. It also suggests poking the service into the foreground with notifications, because Android favours foreground processes. I've tried the thread priorities, doesn't work. I'm currently trying the foreground notification trick, I don't know yet if it solves the problem.
Even if any of those techniques happen to work, it stil seems brittle - the kind of thing that could stop working with a hardware change or operating system upgrade. Is there any way of telling Android that a given thread is important enough to get attention a few times a second, and to have it treated as a requirement and not as a suggestion?
This isn't a general release application that needs to be a good citizen and let other apps have their turn: we're running it on a tablet that's dedicated just to running this application, and that we can modify in any way that's required to support the application.
Have you come across this problem before? What do you suggest?
Thanks.
Hi ALL
Could some one guide me if there is any policy concerning Theme developing?
Note: I state this question using the "development" word as, from my view at S3 forum, both Apps and Themes are under the same subforum.
I'm sure that NO apps could be developed using the below described approach because they will be considered bugged but unfortunately themes are.
Why this questioning:
As trying to do my own theme, I've collect some information by looking how others do and, as the analyses go, I've found some odd things:
a) Some Windows themers, unaware of how their OS characteristics, leave lots of "Thumbs.db" spread all over their work. They, in average, are huge and useless for our android devices.
I try to point the right direction with:
Further info about Windows thumbnail cache.
To quickly disable the automatic creation of these files in Windows, open Explorer and under Tools menu select "Folder Options", select "Do not cache thumbnails", "Apply" and then click "Apply to All Folders"
Click to expand...
Click to collapse
But it's replied with "no harm made" ... That's it ? Junk useless garbage thrown all over the apk's should be considered "no harm made" ?
b) "PNG Throwers".
They see a work that they like, even regardless the base they are in, and simple copy/paste the png's from ones work to theirs. They keep this vicious loop until they obtain the results desired. Now he gets the looks he was looking for but do not remove those junk PNG's that have no relation or effect to their work and are useless too.
So ... what should be the policy regarding this lack of quality control? This garbage should be swallow as is? I'm even more sorry about the unaware users that flash these themes.
Best regards and thanks all for your time and replies.
Hey,
When I turned on my phone the RAM it was taking was 300 MB, after a days use it is now 500MB (even after pressing 'clear RAM' button).
I've entered Settings->apps->running and it shows only two small things (the keyboard and some weather widget) which combined take only 20 MB.
So what is the rest of the memory is beign allocated for?
Thank you.
Does your rom have Usage Manager in the app drawer?
Sent from my SAMSUNG-SGH-I747 using xda app-developers app
Here is the path to all your applications.
Settings -> Apps --> Swipe left until the menu Running --> On top you see the description "Show cached processes", klick on it --> now you see the rest of the running applications
pc103 said:
Does your rom have Usage Manager in the app drawer?
Sent from my SAMSUNG-SGH-I747 using xda app-developers app
Click to expand...
Click to collapse
No, the closest I have is "Task Manager".
lenovoOwner said:
Here is the path to all your applications.
Settings -> Apps --> Swipe left until the menu Running --> On top you see the description "Show cached processes", klick on it --> now you see the rest of the running applications
Click to expand...
Click to collapse
Thank you, indeed I see some more RAM guzzlers, but It seems like they make up most of the addition but not all of it ... plus funny thing, when I try to close everything (in 'running' and 'cache) and I reenter- here it is there again...
1) Can I see all of the elements that take up my ram (the system as well)?
2) Can I close them properly?
Thank you very much.
PS. Is there some comfortable way to jump between apps? Like in the Iphone where by pressing the 'Home' button will show you a bar with a row of icons of the currently active processes....
For your PS question, it's a long press on the Home button (below the GS3 screen).
Sent from my SAMSUNG-SGH-I747 using xda app-developers app
---------- Post added at 10:14 PM ---------- Previous post was at 09:45 PM ----------
The closest app I'm running to that option is Android Tuner Free. I got it for its storage optimization functions.
The busy interface has a learning curve, but it is a comprehensive & poweful app. I recommend Advanced mode & the One Click home screen.
For what you want, see both the Tasks & Kill All tiles. The first is a Task Mgr., the second is a quick 1 click. The app can teach a lot about what runs & why. It also offers a lot of fine control.
I also use the root app Startup Manager which is self explanatory & efficient.
Sent from my SAMSUNG-SGH-I747 using xda app-developers app
pc103 said:
For your PS question, it's a long press on the Home button (below the GS3 screen).
Sent from my SAMSUNG-SGH-I747 using xda app-developers app
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Click to collapse
LOL {hit myself on the head}, didn't occur me to try...
pc103 said:
---------- Post added at 10:14 PM ---------- Previous post was at 09:45 PM ----------
Click to expand...
Click to collapse
pc103 said:
The closest app I'm running to that option is Android Tuner Free. I got it for its storage optimization functions.
The busy interface has a learning curve, but it is a comprehensive & poweful app. I recommend Advanced mode & the One Click home screen.
For what you want, see both the Tasks & Kill All tiles. The first is a Task Mgr., the second is a quick 1 click. The app can teach a lot about what runs & why. It also offers a lot of fine control.
I also use the root app Startup Manager which is self explanatory & efficient.
Sent from my SAMSUNG-SGH-I747 using xda app-developers app
Click to expand...
Click to collapse
I was hoping there is a way to avoid using apps...
Ok, I suppose it opens another question which I thought about creating a new thread for, but if the opportunity already arose...
How do you actually know if you can trust an app?
I'm kinda new to android and I'm much more used to the opennes of windows, also I'm pretty paranoid (a cellphone contains information 100 times more sensitive than a PC (At least my PC is like that)). I look at the permissions every app want to have and I'm simply aghast, I know of the logic behind those requests (at least for most of those I've seen) but I have zero transparency over what actions the app takes.
That really stress me a great deal...
oy-ster said:
How do you actually know if you can trust an app?. . . (a cellphone contains information 100 times more sensitive than a PC (At least my PC is like that)). I look at the permissions every app want to have and I'm simply aghast, I know of the logic behind those requests (at least for most of those I've seen) but I have zero transparency over what actions the app takes.
That really stress me a great deal...
Click to expand...
Click to collapse
Digital Privacy
Well it certainly stresses the last remaining fiber of your privacy. I just watched the latest "60 Minutes Overtime" piece on data brokers framing this as a lifestyle issue. Step back from the small screen & consider that your actions on board the PC have a ripple effect on your smartphone. "NAI Opt out" & "Disconnect software" are useful PC search words.
Where it Went
I rarely hear from a tech guru or even a lawyer who can decipher a EULA, TOS or Privacy agreement they didn't author themselves; yet online, we are steeped in the cumulative concessions we have accepted from them and the affiliates and partners they enable for.
The Biggest Brother?
Google is a data harvester, not a broker. They are the custodians of much of our imprint online across all platforms. check your settings accordingly; within each Google service / app/ platform you use and adjust them to taste. Know, for example, that persistent login to Gmail will append any collocated G-Search activity to your G profile if Web Data | Web History remains on. I read recently that simply joining Plus has a similar but more comprehensive effect by default, by unifying the G tracking across your entire electronic imprint.
Android Permissions
Yes. The most invasive part of Android is its permissions free for all. They are demands, not requests that each app poses. The logic is sometimes one sided and self serving to the developers at our disadvantage. What can we do?
1. Know something about your developer. XDA membership in an app developer helps define their role in a community. Check their website, reviews, accessibility, postings etc.
2. Consider lower permission alternative apps listed in the play store.
3. For each app you review in the Play Store, (have you checked play store settings yet?) assess its longevity in the marketplace to decide if you are willing to be an early adopter.
4. Resist resorting to apps to broker built-in functions your system already has. Learn your OS.
5. Weigh the logic of each permission demanded, based on risk / reward and your intended uses. Example: On my phone Google search leads the field with 59 permissions. App Permisssions by FSecure is in the low end group with zero. How do I know? App Permissions. What can I do? More on that later.
6. Debloat. I have frozen over 60 apps/services/processes using a combination of tools ranging from built in (no root) Application Management to Startup Manager and the App Quarantine app.
7. Don't be lazy about toggling settings as needed. One stock default has the GPS always enabled which may not be necessary for you.
8. Learn about the types of location services in your OS. Check location settings in affected apps and consider toggling location services as needed. Apps will prompt if the needed service is off when you use them.
9. Review your synch settings. Mine are off on the OS. I use a 3rd party mail app and manually back up contacts using Super Backup when needed.
10. Review background data settings. they are visible in Settings / Data usage, by selecting Mobile Data, and scrolling to the list of apps to tap through each and set Restrict background data if appropriate. It saves battery by reducing tower hunting and focuses you on which apps pose the highest demands.
I promised more. Learn about App Ops if you haven't. I have the luxury of running a 4.3 version that supports it so I can use a client app to filter and toggle various permissions on a per app basis. There are other, and perhaps more thorough approaches to this but I'm staying with this one for now.
pc103 said:
Digital Privacy
Well it certainly stresses the last remaining fiber of your privacy. I just watched the latest "60 Minutes Overtime" piece on data brokers framing this as a lifestyle issue. Step back from the small screen & consider that your actions on board the PC have a ripple effect on your smartphone. "NAI Opt out" & "Disconnect software" are useful PC search words.
Where it Went
I rarely hear from a tech guru or even a lawyer who can decipher a EULA, TOS or Privacy agreement they didn't author themselves; yet online, we are steeped in the cumulative concessions we have accepted from them and the affiliates and partners they enable for.
The Biggest Brother?
Google is a data harvester, not a broker. They are the custodians of much of our imprint online across all platforms. check your settings accordingly; within each Google service / app/ platform you use and adjust them to taste. Know, for example, that persistent login to Gmail will append any collocated G-Search activity to your G profile if Web Data | Web History remains on. I read recently that simply joining Plus has a similar but more comprehensive effect by default, by unifying the G tracking across your entire electronic imprint.
Android Permissions
Yes. The most invasive part of Android is its permissions free for all. They are demands, not requests that each app poses. The logic is sometimes one sided and self serving to the developers at our disadvantage. What can we do?
1. Know something about your developer. XDA membership in an app developer helps define their role in a community. Check their website, reviews, accessibility, postings etc.
2. Consider lower permission alternative apps listed in the play store.
3. For each app you review in the Play Store, (have you checked play store settings yet?) assess its longevity in the marketplace to decide if you are willing to be an early adopter.
4. Resist resorting to apps to broker built-in functions your system already has. Learn your OS.
5. Weigh the logic of each permission demanded, based on risk / reward and your intended uses. Example: On my phone Google search leads the field with 59 permissions. App Permisssions by FSecure is in the low end group with zero. How do I know? App Permissions. What can I do? More on that later.
6. Debloat. I have frozen over 60 apps/services/processes using a combination of tools ranging from built in (no root) Application Management to Startup Manager and the App Quarantine app.
7. Don't be lazy about toggling settings as needed. One stock default has the GPS always enabled which may not be necessary for you.
8. Learn about the types of location services in your OS. Check location settings in affected apps and consider toggling location services as needed. Apps will prompt if the needed service is off when you use them.
9. Review your synch settings. Mine are off on the OS. I use a 3rd party mail app and manually back up contacts using Super Backup when needed.
10. Review background data settings. they are visible in Settings / Data usage, by selecting Mobile Data, and scrolling to the list of apps to tap through each and set Restrict background data if appropriate. It saves battery by reducing tower hunting and focuses you on which apps pose the highest demands.
I promised more. Learn about App Ops if you haven't. I have the luxury of running a 4.3 version that supports it so I can use a client app to filter and toggle various permissions on a per app basis. There are other, and perhaps more thorough approaches to this but I'm staying with this one for now.
Click to expand...
Click to collapse
Thank you very much for the comprehensive reply!
Indeed some of the things here are common sense but some were fairly new to me, like the close contact you are suggesting with the developer.
I have to ask though, what reviews are you reffering to? the ones in the app market or the ones on here? Also, from what I have seen in the play market, all of the reviews are about functionality but no one actualy checks the veracity of the code.
Like for instance some song recognition&download software that requires internet access permission (makes sense) and SD card access permission (also makes sense), but besides doing what it does (in a splendid manner, leaving tons of happy customers) it also steals your Whatsapp chat logs (just read an article about that breach 10 mins ago)...
How can people catch on that (otherwise the app will linger for 2 years, giving you the impression you're not an early adopter)?
Hrmph, you have given some very sound advice which I obviously intend to follow through and for that I thank you. However it seems to me like the underlying foundation is still trust in the publisher (not to abuse the permissions you had to enable for functionality sake), and the trust should stem from how well the author presents itself to the community. I suppose it is the nature of the beast, it is just that if I were to sneakily attack someone I would make sure to present myself in th best way possible .
thx.
PS. my version is 4.1 but I'll see what I can do about Appops.
P.P.S I just searched for "Tasks" on google market and all I see is an organizer. Did you mean "Task Killer"?
oy-ster said:
Thank you very much for the comprehensive reply!
Indeed some of the things here are common sense but some were fairly new to me, like the close contact you are suggesting with the developer.
I have to ask though, what reviews are you reffering to? the ones in the app market or the ones on here? Also, from what I have seen in the play market, all of the reviews are about functionality but no one actualy checks the veracity of the code.
Both sources really. There's no hard & fast divide as to what aspect reviewers might respond to at either venue. More often, Play Store reviews have alerted me when my device or my Android version gets poor results from an app. Granted code integrity issues are raised more frequently at XDA.
Like for instance some song recognition&download software that requires internet access permission (makes sense) and SD card access permission (also makes sense), but besides doing what it does (in a splendid manner, leaving tons of happy customers) it also steals your Whatsapp chat logs (just read an article about that breach 10 mins ago)...
How can people catch on that (otherwise the app will linger for 2 years, giving you the impression you're not an early adopter)?
Interesting example. I will look for the article. I wonder if the app declared that permission in their Play Store disclosure. If not, it challenged Google's policing system. I read somewhere that SELinux in newer ROMs, set to "Enforcing" brokers applicable policies from each host domain and also restricts apps from exceeding their declared permissions. (See also my note on 4.3+ below)
Hrmph, you have given some very sound advice which I obviously intend to follow through and for that I thank you. However it seems to me like the underlying foundation is still trust in the publisher (not to abuse the permissions you had to enable for functionality sake), and the trust should stem from how well the author presents itself to the community. I suppose it is the nature of the beast, it is just that if I were to sneakily attack someone I would make sure to present myself in th best way possible .
You're welcome! Placing that trust is ultimately a leap of faith, so we ask ourselves:
Does my configuration already offer this function at the OS or existing app level?
Can I justify each declared permission here?
Is there a less invasive equivalent to this app?
Have I gone over the settings thoroughly once installed?
What does my installed anti-virus say about this?
Do I need this to auto launch or only on demand?
Is it using excessive data or uptime as I monitor?
Am I getting all the Android security I could be with my current rom image?
You get the picture. Common sense, best practices & due diligence can go a long way toward closing the security gap.
PS. my version is 4.1 but I'll see what I can do about Appops.
Google only exposed it (to client apps like App Ops Starter) in 4.3 & 4.4.0, before & after that I believe an Xposed Framework module is the main alternative.
P.P.S I just searched for "Tasks" on google market and all I see is an organizer. Did you mean "Task Killer"?
Click to expand...
Click to collapse
The "Tasks & Kill All tiles" I referred to appear on Android Tuner Free's One Click advanced mode home screen. BTW certain apps on my phone are "frozen" when not in use.
I forgot to mention. 4.3 I'm running is on the 4.1.2 bootloader, completely avoiding lopsided knox security. I hope I didn't appear to recommend the OTA update. That's a personal choice.
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pc103 said:
Quote:
Both sources really. There's no hard & fast divide as to what aspect reviewers might respond to at either venue. More often, Play Store reviews have alerted me when my device or my Android version gets poor results from an app. Granted code integrity issues are raised more frequently at XDA.
Interesting example. I will look for the article. I wonder if the app declared that permission in their Play Store disclosure. If not, it challenged Google's policing system. I read somewhere that SELinux in newer ROMs, set to "Enforcing" brokers applicable policies from each host domain and also restricts apps from exceeding their declared permissions. (See also my note on 4.3+ below)
You're welcome! Placing that trust is ultimately a leap of faith, so we ask ourselves:
Does my configuration already offer this function at the OS or existing app level?
Can I justify each declared permission here?
Is there a less invasive equivalent to this app?
Have I gone over the settings thoroughly once installed?
What does my installed anti-virus say about this?
Do I need this to auto launch or only on demand?
Is it using excessive data or uptime as I monitor?
Am I getting all the Android security I could be with my current rom image?
You get the picture. Common sense, best practices & due diligence can go a long way toward closing the security gap.
Google only exposed it (to client apps like App Ops Starter) in 4.3 & 4.4.0, before & after that I believe an Xposed Framework module is the main alternative.
Click to expand...
Click to collapse
Thanks again!
I just wanted to note that after spending some time here in the forum( http://forum.xda-developers.com/android/apps-games/ ) looking for some intresting picks, I haven't actually encountered much comments from people that actually went over the code... so I'm a bit bummed out. :silly: :laugh:
pc103 said:
The "Tasks & Kill All tiles" I referred to appear on Android Tuner Free's One Click advanced mode home screen. BTW certain apps on my phone are "frozen" when not in use.
Click to expand...
Click to collapse
Oh. Got it.
Anyway, Thank you!!!
oy-ster said:
Thanks again!
I just wanted to note that after spending some time here in the forum( http://forum.xda-developers.com/android/apps-games/ ) looking for some intresting picks, I haven't actually encountered much comments from people that actually went over the code... so I'm a bit bummed out. :silly: :laugh:
...Anyway, Thank you!!!
Click to expand...
Click to collapse
You're welcome. To be fair, most times I've seen postings by people who background checked code it was in rom threads, or over root exploits or security apps. In most other cases due diligence is our best defense.
Apologies if this isn't the type of development question that goes on XDA, but if it isn't, could you please tell me where people go with questions like these? I'm working on my first android application and could use the guidance.
I'm setting up a screen with a search that is querying a SQLite file. I want the search to re-run with every letter entered and show the results in a listview. The full list is on the order of 600-700 items, so we're not talking anything huge.
I'm using ADO instead of ORM because I'm much more familiar with ADO, but if there are enough compelling reasons to switch to ORM I'll bite the bullet and do some reading.
So all that explained, what's the right way to filter the list view. Do you re-run the sql query every letter press, or do you directly modify the data supplier which feeds listview?