Android :: Designing Service For Consumption On Multiple Mobile Platforms
Apr 27, 2010
I am building and designing a (mostly) read-only interface to some data. I'll be uing ASP.NET MVC to build a psudo-restful API. I'm wondering if anyone can provide some resources for building full-client applications for various mobile platforms, iPhone, Android, Blackberry, Windows Mobile, etc. I'm thinking that serving up XML data is going to be the most simple and universal, but parsing XML in objective-C for example doesn't sound like fun to me, but maybe there are some good libaries out there to help ease this task?
In other words, what formt will be the quickest to implement on the client side? Are there any JSON parsrs for iPhone or Android? I know there are .NET JSON parsers, but not sure about other platforms -- is ther another format that might better? Or should I stick with pure XML and deal with it on each platform differently?
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Apr 26, 2010
I have been given the tasks of speccing a mobile application, which will need to run on approx. 1000 devices. These devices already exist, and consist of iPhones, BlackBerrys, Androids, Windows Mobile and Netbooks. The application will have simple reporting capability, and a collection of forms. Anyway, the obvious solution would be to develop some browser based solution, although given the occasionally connected nature of the devices, there's a potential for data to get lost / not saved.
So instead of creating a complex application for each platform, I was thinking we could build what is effectively a form generator, with basic offline storage capability (text files), designed to run on each device, and have the device generate a form, based on for example an XML file that it could request from a server somewhere, resulting in minimal specialist development costs, and the ability to run most of the logic from the server end, with the devices being dumb clients that render forms and upload the data when there is an available connection. Anyway, my question summarised is, how have you made the decision on supporting multiple devices for your application. Is this always an unavoidable problem, and you just have to make the call to support 1 or 2, or pay for developers to write code for each platform, or alternatively supply pre-installed devices to the company?
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May 25, 2014
Eclipse has provided us with different qualifiers like size, ratio , etc. So when I select a qualifier, it provides us with the right emulator screen to make our layout. But are these emulators screen loaded under the right layout folder? I dont understand, how Nexus 10 which is a xlarge screen size is loaded when I load the activity_main under the Normal layout folder?
am I blindly arranging these layouts? Because before this, I had arranged all layouts perfectly and when I went to run it on a Virtual Device, it looked a complete mess. I looked at the xml files and they were completely in the wrong places.
I have used qualifiers like : normal-long, normal-notlong, large-long, large-notlong, small-long, small-notlong, xlarge-long, xlarge-notlong,Should I change the qualifiers?
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Jul 18, 2010
I am going camping next week and need a application for tracking while running. I would like to design my routes online (in google maps or other mapping service) and then use an application for displaying these while running. Anyone knowing such a service/application?
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Feb 2, 2009
I am thinking of developing a small application and I am trying to decide between various Mobile applications platforms - Android, iPhone and RIMM. I was wondering if any of you have any thoughts on any of these mobile platforms, there advantages/disadvantages etc. Also - how would you compare between the various app stores these mobile platforms have.
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Mar 20, 2010
Do any libraries or other development resources exist that can help reduce the effort involved in porting applications between various mobile platforms? In particular, I am interested in supporting iPhone, Android, and Windows Mobile. Some areas of concern include UI, client-server communication, and hardware support (e.g., camera, GPS, etc).
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May 11, 2010
I'm in the middle of development of a client-server "socializing" that is supposed to run on several mobile devices. The project is pretty complex, involving networking, exchanging media, using geolocation services, and nice user UI. In terms of development efforts, technical risks and extensibility what is the best platform to start with? Taking into the account that the goal is go "live" as fast as possible with the mobile version. And second goal is to cover most users (but first is more important).
iPhone (iPod iPad)
Android
BlackBerry
Java ME,
Symbian
I realize that there are limitations on every platform, and there are different aspects to take into the account (for example iPhone has better developer's community then Android, J2ME runs in a terrible sandbox but covers most devices). Please share your pros and cons. I have the experience only with J2ME, unfortunately I can't evaluate other platforms.
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May 15, 2012
I'm contemplating the idea of developing an application for the android. I have several years of experience developing web applications with Java and so figured it shouldn't be too hard to pickup a book and learn how to do it for the android platform. So far so good; that's why I love Java.
My question is in regards to how does the android development community go about testing their applications of the various android version and phones? I think I'm more concerned about the android version rather than the phones. I'm planning on getting the Sprint Evo 4G LTE coming out on Friday, so I'm obviously going to be able to develop and test for Android 4 and HTC Sense 4 (though I don't think that is as important right? Development is usually against the OS and not the UI manager, right?). But how would I go about testing against Gingerbread, Froyo, etc.? Do you guys keep a previous old phone (like my old HTC Evo 4G) and flash diferent roms in order to test the app against previous versions of android? Are there other solutions? If it's using an old phone, does this work off-network/service? I guess you could just dump the apk on the sd card and install as third party app and test it out. As long as the app doing require phone services or mobile data network (internet) you'd be fine if you have wifi access right?
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Dec 18, 2009
Does anyone know if Flash will be able to run independent from the browser? I mean native apps in Flash, not just the player in a browser. The Symbian OS can do that, however I have yet to find an article which explicitly states what will become available in the case of the iPhone and the Android platform. I am not asking about dates, as those are the most fluctuation prone variables. I am part of a web/mobile apps development company which is eager to use flash to make applications even richer in content and user experience.
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Oct 31, 2010
I have heard that the iPhone does not support dynamic linking. I want to know whether any mobile platforms support dynamic linking, such as Android or BlackBerry?
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Jul 26, 2010
As i am being an Android developer, and android is supporting SQLite database, i would like to know that which are the other mobile platforms supports the SQLite Database so that i can make SQLite database common and can place it at one place,and thereafter i can make database transaction from different mobile platforms.
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Jul 21, 2012
I recently switched to a Galaxy S3 after owning an Iphone 3GS for a few years. For me, playing music is one of the most important aspects of a smart phone, and I have somewhat specific requirements. I'm trying to figure out the best way to do this:
1. I have a large library of ripped and carefully tagged MP3s on my home PC.
2. I want to add to this library and keep it synced with my phone.
3. I want my phone to be my primary music player. As such, I want to:
3a. Play a song in the car, via the phone
3b. Arrive at work, plug my phone into my PC via USB or connect over the WiFi, and continue to play the same song, sourced from the phone, but output to my PC headphones
What I DON'T want to do is:
- plug headphones directly into my phone while at work
- use the phone interface to choose/play/stop music while at work
That seems simple enough, but so far I haven't found any software that will cooperate.
- "Google Play Music" won't track what was playing on my phone and then update it when I'm on my PC, the two are totally independent. I'm also not ready to totally commit to the cloud, as I have bandwidth limitations and spotty data reception when I'm not at home or work.
- Kies won't properly sort the music on my phone when the phone is connected, nor does it provide an easy interface for viewing or playing music from the phone
- Windows Media Player refuses to sort the songs on my phone properly. It has problems identifying artists and will sort albums alphabetically instead of in proper track order. It's possible that there's some tagging difference between every other program I've used and WMP, and maybe I can rectify this by retagging all of my music to work better with WMP, but that seems like an enormous task and I'd like to avoid it if possible.
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Apr 15, 2010
I would like to do this, let me know if it possible in android?
App1 --> bindService() or startService() to AndroidService1 App2 --> bindService() or startService() to AndroidService1 (same service)
I would like App1 and App2 to get different instances of AndroidService1. Why I want to do this is say App2 doesn't need the service any more & it calls stopService() then App1 should still continue to work with its own instance of service app.
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Aug 13, 2010
I have a service which both downloads a file and saves it, and it seems I can only specify one permission.
<service android:enabled="true"
android:name=".DownloadService" android:permission="android.permission.INTERNET">
</service>
or
<service android:enabled="true"
android:name=".DownloadService" android:permission="android.permission.WRITE_EXTERNAL_STORAGE">
</service>
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Aug 3, 2010
I have a service component (common task for all my apps), which can be invoked by any of the apps. I am trying to access the service object from the all activities, I noticed that the one which created the service [startService(intent)] has the right informaion. But rest does not get the informaion needed.
My Code is as below:
CODE:................
If I invoke startService(intent). it creates a new service and runs in parallel to the other service.
If I don't invoke startService(intent), serviceObj.getData() retuns null value.
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Jun 29, 2010
I'm trying to refactor/redesign an Android app. Currently, I've one UI activity (Activity 1) that creates a DataThread. This thread is responsible for network I/O and interacts (provides data) with the UI activity via a handler.
Now, I want to add another activity (a new UI screen with Video) - Activity 2. Activity 1 is still the main activity. Activity 2 will be invoked when the user clicks a button on Activity 1. Activity 2's data also comes from the DataThread.
My idea is to put the logic of my DataThread inside an Android Service (DataService). My question is - can more than on activity bind to my DataService at the same time? Is there a way to tell the service to provide data to a specific activity only?
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Apr 19, 2010
I have a service that i need to access across multiple Applications. Can anyone tell me how this can be done?
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Jan 14, 2010
I have to write an application which starts a service. There will be other applications which have to use the service. Is it possible to write an application that only starts service and finishes with the service running?? How can i communicate from the different applications to the service? Is it possible to expose an interface from the service so that application can pass data to the service?
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Dec 25, 2009
Is there anything preventing more than one activity from binding to the same running service?
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Jul 20, 2010
I've created a service that is meant to communicated to an activity using aidl's and callback functions. I got it working just fine with my test activity in the same package. But I was wanting to expose this service to different activities running in a completely different .apk file. Is it possible to accomplish this? What does the separate package need to bind to my service and register the callbacks? Or am I going about this completely wrong and should I try a different method for conveying information back and forth between two packages.
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Sep 27, 2010
IIUC, there should only be one instance of a given service, it is a singleton. However, my (audio engine) service gets instantiated multiple times, although I do nothing for it. When the service crashes (for example when I uninstall the app through adb), it gets scheduled for restart ("Scheduling restart of crashed service.. "). I understand this is an effect of the service being sticky. After that, when my app starts, it calls startService() and bindService(), and the service gets appropriately started and bound. But the service is then reinstantiated and onCreate() is called repeatedly, as many times it was scheduled for restart.
Each instance then wait for clients to bind and register, but onBind() is only called in the "main" service instance. The additional instances wait a bit for client to bind, and since that doesn't happen, they call stopSelf(). But stopSelf() has absolutely no effect in these "dead" instances, onDestroy() is never called.
The "main" service instance does work as expected, and when it decides to call stopSelf(), onDestroy() is indeed called. Worse, all these dead instances accumulate, they never gets destroyed. Therefore, their only possible end is a crash (which happen every time I launch/install through adb), and thus scheduled restart.
So that in the end I get many of these dead instances, which are restarted progressively once by minute approximately.
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Jul 22, 2010
I not only have accounts in all the major IM vendors/formats, but I also have multiple accounts with each service. I have found Fring and Agile, but they appear (from use and FAQ) that they can only support one user per service. Agile is awesome, as it understands how to send video/camera shots directly, and fring seems not to be able to as easy. But that is secondary to being able to load all your accounts, eh? I guess I'm looking for Digsby functionality for Android!
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May 19, 2010
I'm new to Android development and am working on a small test project. I have a service, which communicates with an SQLite3 database, and two activities. A main activity which fetches database information via the service and displays it and a second activity which allows me to add data to the database via the service.
Currently, I have a singleton class which implements the ServiceConnection interface and I'm binding this to the service in the the main activity using the bindService function. Because it's a singleton, I can then use this service connection in both the main activity and second activity to work with the database and it all seems to work quite well.
However, I'm all the time aware that the service connection is bound to the main activity and I'm wondering if this is the wrong/bad way to do it? Would I be best off having two service connections, one in each activity, and binding each to the service?
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Jun 10, 2010
I have a class A which extends TabActivity and creates Activities B, C and D as tabs in its onCreate() function. Also, class A initializes another service handler class S which is responsible for establishing a connection to a service and implementing callback handlers for the service. Any of the Activities B, C and D should be able to receive events from the service and update accordingly. If I receive any event in class S from the the service then I want to call a function in Activity B which would be responsible to update the UI elements in Activity B based on the event received. You can assume that the user is in Activity B when the event arrives.
Can I call an activity function like the following in the stub handler for the callback in my class S -
CODE:................
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Nov 20, 2010
I have a local Service to which multiple activites needs to bind. In the first launched Activity, bindService returns true and onServiceConnected is called. But in any additionally launched activites bindService returns false, and I can't get a reference to my Service.
How can multiple activities simultaneously be connected to a local Service?
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Jan 15, 2010
I have multiple activities and one service.. In MainActivity I successfully connect to service (using a class what implements ServiceConnection + bindService() + startService()) but when i try to apply same method in other activity i see in LogCat a error... It Is possible to connect to service in an other way: something like to make static my CounterServiceConnection object in MainActivity and use it in the second one?
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May 28, 2010
A new question about android and services. Currently I'm developing a App that should send images to a server. It should also be possible to send more images parallel. I made a service that creates for every image a new image. The activity can bind to that service and gather information about the progress. I want to show the current status for every image in a notification (and when the user clicks a notification, an activity with the progress for that image should be shown). But I get several problems with that approach. There are errors with binding, the notification pending event starts the activity completely new, so I lose information about currently sending images and so on. How I could design in a appropriate way.
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Aug 17, 2010
Maybe this is a dumb question, but if Android is so cool and open source and whatnot, shouldn't it be possible to break off of one service provider and go to another with the same phone? Ex: From T-Mobile to Verizon? By just modifying the source code a bit?
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Jan 28, 2010
I need to write an Android application that allows a user to connect to multiple social networking sites like MySpace, LinkedIn, FaceBook etc. and fetch friends list.
I know that most of these applications have Java libraries or functionalities exposed as REST based WebServices. But since there is a lot of variety and disparity in the ways that these libaries are written or service that can be consumed, is there any single, integrated service or middleware component that I can use to provide a unified interface in my mobile application?
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Jun 30, 2009
I'm looking for a protocol to secure a connection between a mobile device and a web service. I want to ensure that only the mobile device can perform actions on the web service and vice versa. Data doesn't need to be encrypted. I know Oauth, but it seems that it's more used to secure connections when you got 3 different entities (Server, Consumer and Auth). Here, the Consumer and the User would be the same person. Is there a simple protocol to do that (without requiring the user to login and then authorize the access token like it is the case for Oauth)? I need to use it on different plateforms, so the protocol needs to be available at least on iPhone and PHP.
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