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Can I create simple programs for Android using Kivy or do I have to learn Java?
By simple, I mean some graphics (some rotating lines, a timer, a highscore), a memo etc not real-time games.
I've created this kind of programs for Windows/Linux and I'd really like to extend to Android.
On Google, most of the answers say that I should learn Java, whereas the remaining answers say that Python is pretty good. I also asked this question on chat, and some said 'yes', while others said 'no' and finally someone said "All programming languages get to be translated to JavaScript, so it is not much of a difference".
No. And may be Yes. Let me explain.
No:
The app will not look native if you use Kivy
There will be a lag in startup
You can call native Java API using Pyjnius but sometimes it won't work fine or you will need to work very hard to get simple things done.
Because you can not use the native UI, crafting a good looking android app might be a lot of work.
Yes:
You can build an app that works
Many games and apps don't use native UI but they are still very usable
You can use projects like Plyer and Pyjnius to get the common android functionality
Kivy might be an excellent choice for games
My recommendation:
Please do check out the apps and games built with Kivy on Play Store. Play with them on your phone or tab. See how they look and feel. Checkout the Kivy docs and see what they offer.
PS: I am a big time Python fan and I do like Kivy. I hope and believe that it will offer better widgets and UI integrations in the future. I wish Kivy offered something like NativeScript where I could use Python to create native widgets.
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So, to be a little more specific I'm looking for an API that will let me see what news stories are currently trending on-line. So for example, if there was a terrorist attack in let's say Toronto, it would probably be the top story everywhere. So I'd like to be able to pull to grab a few articles, and headlines relating to "Bombing in Toronto", or "Kim Kardashian's does something that really isn't news, but everybody is talk about it anyways" for example. It would be even better if I was able to get top news stories by region.
What I'm building is pretty simple. Just a website where you get paired up with a random person, with a prompt regarding a current event, and a few articles pertaining to that event, then you can talk to said person about it. Because somebody will ask, I'm building it as part of the application process for a computer science/business program for 3rd/4th year C.S students to create their own start up, get paid for it, and receive government funding. They just want us to create something to show our programming ability, and what we can come up with in a week as part of the selection proses.
I was thinking about using Google Trends for this, but there doesn't seem to be an official API for it, and the Unofficial ones I've found are rather basic, which is fine, but I'd like to have a more full featured API if possible, even if it uses something other than Google Trends, as long as it works well.
Also, I'm trying to find one that supports Python 2.7, but I'd also be open to using one for another language, such as Java, PHP, or really anything else, even if I don't really know that language, I'd still very much appreciate the suggestion and even if I don't use it, I'm sure someone else will. Right now I'm planning on using App Engine, (probably)Django and the messaging API they have with app engine now, but I'm willing use something else if need be.
You might look at Twitter's excellent API. You can pull out trending topics based on specific locations or "Worldwide". Here's the documentation.
https://dev.twitter.com/rest/reference/get/trends/place
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Are there any libraries or methods that would make sharing code between C++/Java and IOS/Android easier? I realize we have JNI and IOS can use C++ pretty much directly, but it seems like it could be easier.
Microsoft Universal Windows Apps and Chrome Apps are (sort of) doing this.
Open Source is preferable.
I'm using Qt Creator a lot. With the latest versions, you write your whole application in C++, using Qt toolkit, and you can compile it targetting PC, Android and iOS (never tested this last one). If you need to call some SDK functions not available in Qt API, they provide wrapper objects to create and manipulate Jni objects, and you can also execute pure Jni code (loading a java file) if you want to.
If you are looking to share Java, you could try to use this: https://github.com/google/j2objc. I am not certain I'd say that it is easier than using C++. Each option will have some challenges. The downside to j2objc is that it is a translation of Java to Obj-C. So if there is a bug in it (note the comment in the desc which indicates it is between alpha and beta quality), you will need to figure out how you deal with it.
Admittedly, I have only done limited Android dev, and for that, it used the NDK and had a C++ lib which was shared between iOS and Android. I've also developed apps for iOS that were probably 95%+ C++.
BTW, your question is actually a bit vague. If you are talking libs, you should specify what areas you are looking to solve for. Your solution will vary based on your goals.
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I can't seem to find anything on Java/Android that's current (uses IntelliJ 13 etc). Everything seems to be either very old (2011-2012), and either the UI has changed, or they don't use the UI Designer etc
I'm not a total noob to programming, I have somewhat decent experience in C# & Windows Forms, and would love something that can throw me into Java for Android that's UP TO DATE.
Thanks.
If you have decent experience in C#/WinForms, you just need a good Android book, not IntelliJ/UI Designer tutorials… I recommend the excellent BigNerdRanch book. They make probably the best iOS books and the Android offers excellent patterns. With your experience, adapting to IntelliJ should be a breeze, in part because the IDE doesn't force you to do anything. In fact, if you're starting, just use Android Studio (is IntelliJ anyway).
The UP-TO-DATE part consists in always using Fragments, understanding the SDK pieces where you have to consider older devices (if that's your scope), making good use of different layouts for different resolutions, etc.
There's no such thing as Visual Studio Designer. (There is, but it doesn't work the same way). I recommend you read the official android documentation about UI with utmost care since it's the core of Android UI. For the most part, you will tweak your UI from the "XML" instead of the UI designer, which you can use to "see how it looks" or if "makes sense" but trust me, as intimidating as it sounds, it's actually not rocket science and you get used to it relatively fast.
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I've been thinking a lot lately about a music-oriented project I'd like to work on. Kind of like a game... kind of like a studio workstation (FL Studio, Reason).
I guess the best way to describe it would be: like "Guitar Hero", but with no canned tracks. All original music--composed by you, on the fly--but the software would use its knowledge of music theory (as well as some supervised learning algorithms) to make sure that your input gets turned into something that sounds great.
It sounds a little silly, explaining it like that, but there ya go. It's something I think would make an interesting side project.
Anyhow, I'm looking for a Java library for generating the actual audio. Browsing around on sourceforge, there are countless software synths, and I have no idea which to choose.
My top priority is that it should sound incredible... Really rich, layered, textured synths, with gobs of configurable parameters. Emulation of acoustic instruments is not important to me.
My second priority is that it ought to be straightforward to use strictly as a library, with no GUI involved at all. (If there's a synth with really breathtaking output, but it's tightly-coupled with a GUI, then I might consider ripping the audio portion out of the application, but I'd rather start with a nicely contained library).
I know I could send MIDI to a standalone synth, but I think it'd be cool to read the actual synth code and learn a little DSP while I'm at it.
Any suggestions?
Oh yeah, I'm on Windows, so posix-only stuff is a no go.
Thanks!
Have you checked out JFugue? It's an "open-source Java API for programming music without the complexities of MIDI".
Additional information: Found a couple of other resources referenced in the JFugue documentation (pdf):
Audio Synthesis Engine Project: open source version of Java’s MIDI synthesizer
Gervill: open source software synthesizer created as a proposal for the Audio Synthesis Engine Project
Yeah, I noticed JFugue a few years ago. It's on my list of interesting computer/music bookmarks:
http://delicious.com/BenjiSmith/computermusic
http://delicious.com/BenjiSmith/programming.java.libraries.music
But JFugue is all about the structure of the music itself... the melodies, harmonies, rhythms, etc....
What I'm looking for right now is just the synthesizer. Something like this...
Synth s = new Synth();
Instrument i = s.getInstrument("Robot Bass");
i.makeAwesome(true);
And then I'll send my events into the MIDI stream (or into whatever control API the synth library provides).
If Clojure is an acceptable option (runs on the JVM, easy to integrate with Java), then it's definitely worth checking out Overtone.
It uses SuperCollider as the synthesis engine, but wraps it all in a nice DSL and interactive programming environment.
minim isn't exactly a java synth, but it is a processing lib and I imagine that it should be pretty easy to use with vanilla java too.
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I'm working on building an app to scan directly from TWAIN scanner to a Java applet. I'm already aware of Morena and JTwain, but they cost money. I need free. I could re-invent the wheel with JNI, but it seems like someone has probably already done this as a FOSS tool.
Is anyone familiar with a free tool that can get a Java applet to read directly from a TWAIN scanner?
Calling the TWAIN API from anything except C/C++ is going to be a major pain, it relies entirely on complicated C structures that you have to replicate exactly in memory. If you need only fairly basic scanning, you could use something like GitHub site to call my old free 'EZTwain Classic' DLL (google for eztw32.dll)
hm. I might have some homebrew available for it somewhere I could check, but for now: At our company, we basically gave up on this issue and implemented an (unfortunately win only) ActiveX solution: Site Link
I've actually purchased the chestysoft activeX control. Been using it for about 3 years. Works great but as with all ActiveX you are restricted to IE. And this one is 32-bit only.
I'm looking into a flash approach now. Since flash can capture from a camera why not from a scanner. If I remember I'll report back what I find.