I wanna to know in detail what is the difference between symbian OS and j2me.Which is best to use
It al depends on what you are trying to build. If you need to support multiple phones with different OS, then JavaME is probably what you want.
If you need to develop full native applications for Nokia phones with Symbian OS, then Symbian is probably what you want.
Although JavaME is not platform independent (you will probably have to have multiple versions your APP for phones sharing the same features) you will get some degree of independence that will make your life easier if you are targeting multiple platforms.
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I made a little heart rate monitor app with Unity, but trying to ship it to Windows, the bluetooth part isn't cross platform.
Are there existing cross platform (mac/windows, linux too would be nice but not a dealbreaker) bluetooth solutions?
Unfortunately there isn't a "pure" cross-platform solution where you can write one application that works across multiple platforms. This is because the underlying stack for different OSes/platforms is different because the hardware is different for them. The closest thing to a cross-platform solution might be Xamarin as theoretically you can write an application that works for Android/iOS/Windows. Have a look at the links below:-
Developing Cross-platform BLE Apps
ble.net: cross platform BLE library
BLE on Xamarin Cross-platform
The smart BLE Guide: Add BLE to your app with Qt and Flego
I am aware of two cross-platform audio libraries that cover OS X, Windows and Linux: RTAudio and PortAudio
I'm aware of a couple that support OS X and iOS: Novocaine and TAAE
However, I can't find anything that supports OS X, Windows and Linux and also iOS, Android
Does such a technology exist?
Un4seen's BASS audio library claims to do what you want. I've only used it on Windows, but there is a lot of chatter about it for Android an iOS, as well as the desktop platforms.
http://www.un4seen.com/
It's free for non-commercial use, otherwise the licensing is pretty decently priced in my opinion.
(https://www.juce.com/)(JUCE) was my choice in the end.
It is a C++ platform with a focus on real-time audio. I don't know how I missed it in the original question.
JUCE has gone from strength to strength over the past few years. Recently they have reorganised the licensing model so as to encourage independent/indie developers.
Don't want to sound too much like an advert, but I'm very happy with this technology stack.
I'm developing an application that needs to synchronize the time on a server with the time on the device.
Blackberry devices have the net.rim.device.api.system.Device.setDateTime(long dateTimeMillis) method for this. I'm looking for something similar in Java ME devices.
I can live with manufacturer specific APIs - specialy nokia, sony ericsson and motorola ones, and most JSRs.
Does anyone know if there is any way to do this?
Most manufacturers, such as Nokia, don't have that functionality in Java. You may need to take a look into Symbian C++ and other platform specific development tools.
You can't do with Java-me for some security reasons. So you can't change the internal time of system. You can possible to get the current time only.
I need to develop mobile application, so I decided to develop the application on J2ME.
This application must be support for Blackberry mobile, in this application we are using google maps, so can I use the J2ME software and if I develop the application in j2me how many types of mobile can support my application?
If any better software is there for supporting different mobile please suggest me.
I already developed the application in Android, this software supports few mobile, so I need to develop the application which mobiles are not supporting the android.
J2ME used to be the most widely deployed runtime on mobile phones wordwide (it may still be, depending on when you read this and the amount of Android phones sold by then).
These days, there are many phones that don't support it:
- closed phones (they don't let you install any application)
- Android
- iPhone
- BlackBerry 10
- The Palm WebOS phones
- I don't know whether the Samsung Bada phones support J2ME
- I expect that most of the mobile linux handsets (Maemo, Meego, Limo, Sailfish...) don't include J2ME by default. They tend to prefer a port of the Android runtime
- ...
The problem in developing an application that needs to support many handset models in many different countries is J2ME's curse: the dreaded fragmentation.
J2ME itself usually means the JSR-118 specification, along with a whole bunch of other optional APIs specified in JSR-75, JSR-82, JSR-120, JSR-135, JSR-139, JSR-172, JSR-177, JSR-179, JSR-180, JSR-184, JSR-185, JSR-205, JSR-211, JSR-226, JSR-229, JSR-234, JSR-238, JSR-239, JSR-248, JSR-256. You can see them all here.
These specifications have been interpreted differently by different companies implementing J2ME and they are often too generic to ensure the same piece of code to work identically on different phones.
Different mobile network operators also impose different requirements that sometime force mobile phone manufacturers to change the way their implementation of J2ME works based on who subsidizes the handset.
Operators can also modify data that goes through their mobile network.
I've been tasked with using WURFUL to determine whether or not a mobile browser is capable of downloading a J2ME app developed by my company.
I first thought I could use the "device_os" tag and filter by that, however, I'm unsure what the complete list of J2ME OS's are... any ideas?
I've been told there are no MIDP requirements, and that the application will run on any J2ME-supported handset (with two specific resolutions, which I already know how to query)
Thanks in advance.
There is no way to know all the OSes that support J2ME. Mainly because most feature handset comes with a proprietary OS which probably you have never seen before. It is a better idea try to identify the handset model and decide if it supports J2ME or not.
Another thing is, you may want to know which JSRs are supported by a specific handset. I do not know your application but probably you are using some optional JSRs that are not supported by some handsets although they have basic J2ME support.
Java ME SDK 3.0 includes a database of supported devices. Also there are other web sites that provides these kind of information. One example to those would be this J2ME Handsets web site.
If you are fine with just covering a large range of phones, you should include Symbian S60, S40, Windows Mobile, Blackberry and Android.
Symbian
Win Mob
Android
Almost every Sonyericsson phones
IMHO you don't have to worry about how many handsets support j2me because majority of the phones support it.
At least Symbian and Android.