I have this idea of writing an application to automatically sync files to a specific place for an ipad every time the ipad is plugged in the computer.
The problem is I've never developed a software like this before. Right now I have these two big questions:
- How to detect when an ipad is plugged in the computer?
- How to connect to and copy files over the ipad?
To make things clear, the application I want to develop should have similar functions like iTools (not iTunes).
Does anyone here have experiences in developing this kind of application? Would you please share with me how to start with this project, because I'm clueless :(
There is a rather simple option; use a internet based service to accomplish this task - just as DropBox, iCloud and similar services do it already. Maybe you can get a lot closer to your goals by simply connecting to the API of DropBox, SugarSync or alike.
Using a direct (USB-) connection to the device will be rather tough to implement and, to my knowledge, will prevent you from selling the resulting software through Apple's channels. I am not saying that it was impossible (see iExplorer) but I am saying that such endeavor will involve a lot of reverse engineering of undocumented functions to a degree that might be considered illegal in certain countries. Additionally, maintaining such software will be very demanding as Apple frequently introduces changes within their communication protocol/s.
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I am developing one mobile app, the requirement is as follows.
1.The app should work offline and online.
2.It should have database in both local device and in the server.
3.When internet is on data has to be synced between local and server.
4.At any point of time local data and server data should be the same.
I have done lot of research on this but not able to find whether hybrid app development supports or not. Some one says we can do but other link says it's difficult and might not be possible.
Please help to me sort out this issue.Thanks in advance
for sure it is possible to have those features in an hybrid app. All depend what you choose to use to deal with that or how you choose to program it.
Remember than an hybrid app have almost all features that a web application could have as it could use almost all technologies, tricks, frameworks and libraries out there.
I have already developed an hybrid mobile app using cordova, jquery and jquery mobile that meet points 1 to 3. Though I am not saying you need to use jquery, or any of the other tools. I described the solutions I use for that app, however they are maybe not the best but it was the most practical and easiest solutions given the time frame and budget.
Was achieved by mirroring the server "data base" the first time the app is installed with WiFi access. When no internet is available the the app use the local data, when it is available then it take the data from the server and update the local data.
The local database was not a formal one, just JSON data files, very similar to the ones provided by the web service.
You can be checking for an active internet connection with the cordova network functions, once detected try to reach the server to check if the actual connection is working, on success then proceed to request mirroring the data. Just be sure to check if the local data is newer to the server one and instead of overriding you should first update the changes in the server.
I think this point is a bit difficult given the fact that you want to work offline. When you are offline you couldn´t do too much to reflect the server data into the app, as you are offline. Then having an exact mirror at any time is not feasible. However having a mirror when you have connection then that is another story.
Having a perfect data sync should be done carefully and instead of programming you own solution try to use a service or tools for that, like http://www.couchbase.com/mobile.
Hope it helps.
Hybrid applications are, at core, websites packaged into a native wrapper. They look and feel like a native app. Hybrid app have main features are portability (one code base, multiple platforms), Access to various hardware/software capabilties, cheaper orginigation costs, faster speed to market.
As a final school-graduation project I try to develop a kind of spying-car. Which means there is an iPhone placed on a little LEGO-car and an iPad used as a "steering wheel" for the car. Also it is planned to transmit Audio and Video from the iPhone's microphone/camera to the iPad (more than the steering data vice versa).
In the first place the connection from iOS to iOS should be established over a local WiFi network and later - if possible - over 3G (by using the iOS devices network-IP and a DNS server to deal with frequently changing addresses).
My question is: which technology do you recommend using? I read about GameKit, peer-to-peer and so on, but I think these technologies are too abstract for later being able to communicate over 3G. I guess I need to go a little deeper into the low levels of the communication progress. Any suggestion that could bring me a step forward is highly appreciated! (also regarding other parts of my project)
One more thing: Some user suggested using a third party service and to route the sent (video) data over an external server. If possible, I'd rather not use any "middle man". It should just be a basic server-client communication where the iPad is the server and the iPhone the client.
It is kind of an open ended question, but interesting.
First of all, GameKit do have 3g p2p support, see here:
https://developer.apple.com/library/ios/documentation/NetworkingInternet/Conceptual/GameKit_Guide/Matchmaking/Matchmaking.html
It will handle the peer-to-peer addressing and establisment of the socket. It can also handle voice chat, but I personally never tried this feature so I can't say if it is feasible in your case.
One idea is to leverage existing video-chat services. This will give you a low-latency audio/video channel with peer-to-peer addressing (well, likely using a central server).
Apple's FaceTime is such a service, but there is no public API to it (AFAIK). Same goes for Skype and Google.
There are some paid services that look like they have nice iOS APIs:
http://tokbox.com/platform
http://docs.weemo.com/sdk/ios/
You have to figure out a way to transmit control commands to the peer iPhone, I did not see if the services above had any possibility of sending text messages/arbitrary data.
Tokbox has a free trial so you could try it out and see if it works for you.
I would go for GameKit if this is a hobby project on a budget and there is time for hacking, and probably look into a more high-level API if there is a deadline...
sorry for writing this as an answer, but i don't have enough rep to comment...
i'm working on a similar project and i currently don't have any advice regrading video-streaming, however, from what i read (extensively) i came to the conclusion that i need to use p2p connection between devices for better performance and use socket programming in order to achieve this (although not the most easy to implement choice).
I considered using GameKit which i think will probably answer most of your needs as Krumelur pointed out. but in my case, eventually the app will be cross platform so i had to use low level network programming. you can check out my question here to see the sources i used to try and make the connection between 2 peers, hopefully you'll have better luck than me...
I have a multi-platform mobile app that I am releasing on iOS, Android, Windows Phone 8, and Blackberry 10 (WebWorks). For the other three non-BB platforms, I have a way to distribute the enterprise app via a web server (user installs by clicking a link on a web page inside of a mobile browser). However, for BB10 Webworks, I can't seem to find a documented way to distribute a .bar file in this same manner.
Options:
1) I have seen docs that discuss placing Java-based apps (.jad and .cod files) on a web server for OTA distro, but can't find any documentation on being able to do the same with BB10 .bar files.
2) Blackberry App World - but this is public, which is not what I want for this enterprise app
3) Blackberry App World for Work and BlackBerry Enterprise Service 10 - both of these seem to be overkill for my modest purpose. I only have a single app and simply need a download link, not full app/device management, app catalogs, etc.
Is it possible to do #1 with .bars? Or is there another option I have not considered?
Thanks
I was not aware that sandboxed users could see apps other users couldn't, as mentioned in the one of the answer - something for me to try!
The only other option I am aware of is to "side load" the bar file, you can side load with various tools which you can find if you search, such as:
http://forums.crackberry.com/blackberry-10-os-f269/how-get-bb10-hardware-id-sideload-app-bar-file-into-blackberry-10-a-780773/
http://forums.crackberry.com/android-app-sideloading-f279/how-sideload-apps-bb10-device-easy-way-windows-825656/
I haven't tried out these tools, sorry.
I actually do it using the tools you get with the Android Command line toolset - available from BB web site here:
http://developer.blackberry.com/android/tools/
but this approach are not 'user friendly'. I use it because I have converted a few Android apps to run on BB10 and so got to know the tools.
I can't say that these tools are safe, since I don't actually know them, but what I can say is that I am not aware of any way that a PC based tool sending something over the internet (or USB) to your BB10 could break it, nor am I aware of any way that a side loaded app could break your BB10. The days of bricking your BB devise with a dubious bit of software do seem (thankfully) to be over.
Edit: Just thought I would update this given the options that Nate has found, which I also didn't know about!
Both the sites Nate has found seem to work in the same way as the tools I mentioned above. My understanding of all these tools is that they run a deploy utility, that connects to the BB10 device via a TCP/IP connection (which could be routed over WiFi or USB), and sends the bar file over this connection. The connection is initiated by the deploy utility, which is why it has to be in the same network.
There is likely some BBRY proprietary protocol involved, which includes an exchange of the password, as the password supplied to the deploy utility must match the development password on the device.
Now I strongly suspect that BBRY have not published the specification for this communication. I also strongly suspect that the password is never seen in the clear, so you could not use some tool like Wireshark to reverse engineer this. My suspicions therefore is that the tools, including the two I have pointed you at, all run something like the Android Command line tool under the covers - and they got this from BBRY. So perhaps you can build something like the web sites yourself - assuming you have the time and inclination of course.
Just a thought and just my opinion.
There is probably a better way, but I don't know about it. Anyway: you can deploy an app to the BB World, but not put it up for sale, then add users accounts to your sandbox. They, and only them, will be able to download your application, which will not be shown on the BB World to anyone else.
This isn't natively supported on BlackBerry 10, but it looks like there are a few hacks that people have already figured out to make this work.
Depending on your needs, these may or may not work for you (see especially the security caveats on the FAQ pages).
https://sideswype.me/
https://barinstall.com
These appear to take advantage of a VPN security hole. BlackBerry has previously patched this hole, but according to the BarInstall site, the owner just added support for 10.2, to work around the patch.
Both of these services do charge a modest fee, but it may be easier for you than maintaining a BES server.
Peter Strange's answer is quite comprehensive for the time it was written. I will just add that with the release of BB 10.2 you have the option to distribute your application OTA as an APK. Since you are using HTML5 for development I suspect there will be little performance difference between running the APK and running the BAR. But that is something you can check out if you have, or know someone with a BB10 device. Performance should improve with the release of 10.3.
I'm nxj beginner.
I have some questions about bluetooth communication between PC and brick.
First, when bluetooth communication occurs, where is the birthplace processing this datas?
In other words, I want to know whether these datas will be processed on CPU or brick.
Second, what is exact roles CPU and brick in bluethooth communication?
That means what is processed on CPU and what is processed on brick.
I have searched almost web site but I can't find this anywhere.
Please help me. Thanks.
You can see it in the package structure.
lejos.nxt.*
This package contains classes running on the NXT-brick. All code in this package will be compiled for the brick and will run on the brick.
lejos.pc.*
Here the difference is not that clear. This is java-code you compile for personal computer. So most code runs on your computer. But some classes (e.g: RemoteMotorController) only send messages to the NXT-brick which gives commands to the motors.
lejos.pc.comm provides API's that allow you to communicate/control the nxt robot from the PC.
When importing the the libs to an Android project, it allows you to build an instance of the same environment used on a pc, but within android.
I agree it can be tough finding some things out. It would be great if there was as stronger lejos presence on SO
This question is months old and has remained un-answered I actually have a lot of questions about it myself, but I might be able to provide some insight for utter novices.
when using bluetooth with Android and NXJ robots, you use either lejos.pc.comm or lejos.NXJ.
Both provide APi's to do almost the same thing, but work a little differently. I don't know nearly enough about the NXJ api, but I do know that it is the one that lets you manipulate the robot much more effectively, such as outputting data to it's LCD screen, which you can't do with the pc.comm api
As far as I can tell, the pc.comm API uses both Android Bluetooth API's and it's own protocols to allow communication with Lego LCP commands.
(I want to come back to this, but I'm writing a dissert on the topic so I'll try to update it in a couple of days. Seems not many are interested though, shame)
I've been scouring the SO board and google and can't find any really good recommendations for this. I'm building a Twilio application and the text-to-speech (TTS) engine is way bad. Plus, it's a pain in the ass to test since I have to deploy every time. Is there a significantly better resource out there that could render to a WAV or MP3 file so I can save and use that instead? Maybe there's a great API for this somewhere. I just want to avoid recording 200 MP3 files myself, would rather have this generated programatically...
Things I've seen and rejected:
http://www.yakitome.com/ (I couldn't force myself to give them my email)
http://www2.research.att.com/~ttsweb/tts/demo.php
http://www.naturalreaders.com/index.htm
http://www.panopreter.com/index.php (on the basis of crappy website)
Thinking of paying for this, but not sure yet: https://ondemand.neospeech.com/
Obviously I'm new to this, if I'm missing something obvious, please point it out...
I am not sure if you have access to a mac computer or not. Mac has pretty advanced tts built into the operating system. Apple spent a lot of money on top engineers to research it. It can easily be controlled and even automated from the command prompt. It also has quite a few built in voices to choose from. That is what I used on a recent phone system I put up. But I realize that this is not an option if you don't have a mac.
Another one you might want to check into is http://cepstral.com/ they have very realistic voices. I think they used to be open source but they are no longer and now you need to pay licensing fees. They are very commonly used for high end commercial applications. And are not so much geared towards the home user that wants their article read to them.
I like the YAKiToMe! website the best. It's free and the voices are top quality. In case you're still worried about giving them your email, they've never spammed me in many years of use and I never got onto any spam lists after signing up with them, so I doubt they sold my email. Anyway, the service is great and has lots of features for turning electronic text into audio files in different languages.
As for the API you're looking for, YAKiToMe! has a well-documented API and it's free to use. You have to register with the site to use it, but that's because it lets you customize pronunciation and voice selection, so it needs to differentiate you from other users.