Need to decide which way take to develop an Android App - android

I'm currently getting involved in an app project with a web site that will mirror its actions, the main goal is to confirm presence in clubs and bars and get discounts with it. (A little more than that, but not the scope of the question).
Despite my programming experience, I've never developed an app before, and at this time we already have the front-end of the website done, my question is if there is any advantage in developing the app from scratch, with an IDE or is it just time-wasting compared to using tools like those recommended in this article here.
What could be the drawbacks of just "converting" the website to an app?
TL;DR: Developing an app, is worth it to develop with an IDE or an online paid tool should do this job perfectly?

Both the options are viable.
Facebook, an extremely popular app just uses a WebView and renders the mobile version of their website (I am oversimplifying here). You still need a mobile version of the website though. The downside is, it will not look (or feel) as good as a native app.
On the other hand, a separate native app means more maintenance efforts.
Pick your poison.

Related

Android-to-web app-to-iPhone, without Xcode

I have released a native Android application, which I built in Android Studio. After a rocky start, it is now doing alright in the PlayStore.
I hope to release an iPhone version soon, and I am considering my options.
My general approach will be redeveloping the project as a web application using Ruby on Rails, then converting that to an iPhone app somehow.
I am writing to ask more about this final step. What cost-effective ways are there to convert a web application to iPhone format?
I am aware I will need $99 for the Apple developer programme, and I would like to keep my overall costs close to that amount. I had thought of using PhoneGap. Are there any extra steps between PhoneGap and publishing on the App store?
Extra information, which might help contextualise my situation:
I do not have an Apple devices or software for development or testing. I’m not the Prince of Monaco, so I do not intend to spend on these things anytime soon. My app is called Victoriana, and it is a Choose-Your-Own-Adventure/ text adventure game. Pretty basic, really.
This is my first real project, and I first came into developing through tutorials and Android Studio.
It would also be my first time coding a web application or using Ruby, but for converting this non-complex project I am happy to learn something new.
Unless your app requires a lot of database interaction, Rails is probably too heavy-weight for what you need. If you're set on building a web app in Ruby then Sinatra is much simpler and a better option for beginners, but again depending on the complexity of the game, how you persist state etc, you might actually be better off with Javascript and a single-page app framework.
There really is no developing for Apple products without running macOS, but it is possible to do this within a virtual machine on a Windows PC.

Developing in Android Studio versus Framework (e.g PhoneGap)

I wanted to get a more experienced opinion on something I recently found out. A couple of months ago I set a goal to build myself a mobile app, and the first thing I did was go to developer.android.com and begin reading documentation on how to go about doing this.
I've invested a lot of time in understanding Android Studio and how to make simple apps (and I'm just now getting the hang of it all), but I just recently read about frameworks like PhoneGap(which let web devs who know HTML,CSS, and Javascript make apps too).
Before learning Android, I taught myself web dev through the Odin Project, which taught me a fair amount of HTML, CSS, and Javascript (little iffy on this language, but I'm sure it's something I could pick up easily since I already have a bit of experience).
I'm wondering what you guys feel are the limitations of using these frameworks and whether I should switch over to them, as opposed to continuing with Android since things are beginning to click for me.
Thanks!
I have developed apps for both Android and Phonegap. Phonegap takes advantage of your web development experience and lets you build mobile apps with ease. But it's not a replacement for Android API itself. A good phonegap application requires knowledge about web development and Android API.
However if your aim is to develop an android application, and you are comfortable with web development and Android, I would advice to take Android API.
Phonegap as wonderful as it is for web developers, and startups who can't afford to have dedicated resources for Android, iOS separately, has its limitations.
Performance : Phonegap app's performance is not at par with a native
android application.
Functionality : As one would expect you can't have all the functionality support a native android application has.
Look : You could easily tell apart a phonegap application from a native one. Given phonegap renders all the content in a webview, the look of native ui elements is lost
I think you will always need access to the native API to make good apps.
At least the navigation should be native, so that your app has the look and feel that the user expects, and so that stuff like the back button get correctly handled for you.
Even if there is some plugin that does that for you in a perfect way, I believe it's beneficial to know how Android works.
In the end, frameworks like PhoneGap add a layer inside your app rather than removing one, and it's always better to understand what goes on inside your app.
So the time that you've spent learning native Android won't be lost.
However, it makes sense to use HTML/JS if you want to share code between different platforms.
I think this article from Basecamp shows a very compelling example: https://signalvnoise.com/posts/3743-hybrid-sweet-spot-native-navigation-web-content.

Struggling between native and phonegap, simple app requirements

I'm going to make a native (meaning; not in the browser) mobile app. Since I'm a web-developer I'm struggling to decide whether or not I should try Phonegap or just build an native app in java or objective-c.
The app requirements are simple. GPS/wifi location, Facebook integration and I guess I'll need a database to handle some of the application specific Facebook-friend relations. Like the highscores in a game, for example - stuff like that.
I'm a web-developer, and don't know neither java or objective-c, yet. I've never used Phonegap before, so I don't know if it's capable of fulfilling my requirements.
So my question is as follows;
Can I use Phonegap for my app, or do I need to dive into a new language?
Related:
Larger version of this article can also be found HERE, to be transparent it is my personal blog.
Hybrid vs Native apps
Hybrid apps:
Pro:
Quicker development, especially if you're a a longtime web developer.
1 language can be used on every available platform. This, of course, requires a Phonegap wrapper. You don't need to learn Objective C, Java, or C# to do any development. You need only to understand the basics of the Phonegap implementation. You will need to play with above-mentioned languages a bit but you don't need to understand them.
Phonegap can offer some native capabilities like iOS native tab bar or Android native tab bar and so much more.
Lower budget costs and a huge community of supporters and developers.
A hybrid app offers many of the advantages of both approaches access to the most common device APIs, and broad device coverage while not requiring the specialized skills, bigger budgets and longer time to market that are more typical of fully native apps.
Cons:
You will piss blood after some time, literally and metaphorically.
Mobile phones (even today's tablets) are not fast enough to smoothly run a hybrid app, mobile JavaScript capabilities are bed at best. Android platform is a nightmare, page transitions don't work smoothly not to mention lacking CSS/CSS3 implementation. If you think native Android 2.X and 4.X have differences take a look a Android 2.X bad JavaScript / CSS implementation. iOS fares better but still has a lacking CSS3 implementation thou much better page transitions. To make this short native apps will always have a better user experience and general feeling.
You will spend much more time fixing the app then building it. Creating an app for each and every platform is a pain in the neck. Browsers on different platforms do not uniformly support all the latest HTML features and APIs, which can make developing and testing a challenge.
If you don't have a good designer, don't even try to build an app; looks are everything.
If you don't know what are you doing there's a good chance your app will not get permission for Apple app store. Even Google Play Store will ban your app if they discover a 3rd party Phonegap PayPal plugin.
Native apps:
Pro:
A native mobile app can produce the best user experience — fast and fluid, can give you the best access to device features, and can be discovered in the app stores.
Without a doubt, native apps have full access to the underlying mobile platform. Native apps are usually very fast and polished, making them great for high performance apps or games. This is more then enough.
Cons:
Bigger budget, you will need at least a person/s with Java and Objective C knowledge, even C# if you want a Windows mobile app. Yes you can learn it yourself but don't live under the illusion you will do so in a short time. If you have never done any development, choose Objective C (iOS is still a better platform). In other cases choose Java. Java has a syntax similar to other available languages, so it is easy to jump from C# to Java and vice-versa. Objective C is a world of it own. It has a rather uncommon syntax.
It might take you a longer period of time to develop all of them and time is money. This depends on the complexity of the apps.
In your case, if you have a good web development/design skills and/or have a good designer you should choose a hybrid app. Go native only if this app is going to be a complex one. Everything you want can be done with a hybrid app. And you will find a great and supporting community.
Hybrid apps
What I didn't previously mentioned you need to be specially careful here. Even if you are seasoned developer you will find a lot of problems you can't solve. Hybrid development should not be mistaken for a basic web development.
Every mobile platform has its own set of problems, not to mention that mobile phones behave differently depending on a device. If possible always create a app that works on a slower devices because native app will successfully work on almost any device.
There's one last thing, when creating hybrid apps, app development will take you about 30%-50% of your time, rest goes to specific platform debugging and learning. Believe me, even after several years of mobile development sometimes I am facing problems I can't solve alone or fast enough.
So be careful when choosing mobile framework, pick 2-3 and spend several days reading about them.
Links
Here are few links to help you decide:
PhoneGap + jQuery Mobile 1.4 tutorial - This is a step by step tutorial for PhoneGap and last version of jQuery Mobile
PhoneGap + jQuery Mobile 1.4 tutorial - MacOS version - This is a step by step tutorial for PhoneGap deployment on MacOS. jQuery Mobile part is covered in a previous article, no point in repeating things.
jQuery Mobile vs Sencha Touch - jQuery Mobile Sencha Touch comparison
jQuery Mobile vs Kendo UI - jQuery Mobile Kendo UI comparison
7 best known HTML5 mobile frameworks - Name tells everything
7 less known HTML5 mobile frameworks - Name tells everything
if your application does't have animation effects and simple i prefer to create in a web(Phonegap) cz at less amount of time we can launch in multiple types of mobile OS.
if your app contain more UI effects and animation then it is best to go with native..
even though you develop in webview(Phonegap) you need learn some basic steps in Android and iOS
How Phonegap performs in devices
Ios
The animations and view loading in ios webview is stranded and good, the animation effects can observer clearly
Android
We have to consider the device version and device company for android while running the html code, Some high config devices in android give more clear and efficient animation display, but some devices (mostly old version and some company devices) cant give good animation effects, rendering effect varies from device to device in android,
In my humble opinion with Phonegap you can just develope simple apps, nothing more. The documentation is not enough and like others have said you will spend much more time fixing bugs and finding plugins than building your app. I would make the effort to learn Android or iOS or whatever, look at it as an investment of your time. (Yes, my comment is a little biased).
Last I looked into it PhoneGap was all html,css, and javascript. So, you may feel right at home. PhoneGap can handle GPS location, see this article from PhoneGap's documentation. Whether or not you want to pick up Objective C would depend on how fast you pick up new languages as it is a bit of a departure from web development.
It totally depends on your needs
After publishing my first app several months (native Android, database driven, restful connecting app), I decided to rewrite my app by using phonegap (since I want to clone the app to iOS, so instead of doing it in ObjC, why not javascript ?)
When on Android, it costed me, a Java developer, 3 weeks to learn and code everything from scratch. Banging my head to the wall several times for how to make the ListAdapter sync with the Restful Service from my server, how to theme the app (quite hard in my opinion, especially when it comes to special effects like transparent, border,...), and also, how to structure your code base effectively (if you are familiar with Java, you will find that all the classes are very coupled to each others, since that is what most of the tutorials write about)
When on Phonegap, everything is done in 1 week. Css, html, with onsenui and angular make the GUI development just like about 1 st year student 's assignment and theming is just a piece of cake. I don't need to run it on the real device, just use browser during the development, change code and refresh are enough. Angular provides 2 way binding with the DOM, and this makes a huge awesomeness when collecting and showing data. For example:
<ul ng-each="for sentence in sentences" >
<li>{{ sentence.title }} </li>
</ul>
When the variable sentences is changed (retrieved from server), the DOM is automatically changed as well. However, javascript is only javascript. I found myself struggling many time when debugging the app, especially when doing the MapReduce functions with PouchDB (big mistake, have to go back to cordova-sqlite-plugin tonight) and most of the time, I have to read the log in order to figure out the problem (Chrome 's tools and Firebug cannot catch the breakpoint). Also, it is hard to restructure your app (javascript, again) so if you don't organise carefully your code base at the first sign, you might end up with a mess (and debugging is a real pain, again). PhoneGap is also Web based, so sometimes, you will hear that "because on this platform, it does not support that bla bla bla" (e.g, localStorage) and you have to stand for it if you cannot find any good plugin.
Conclusion Except for the limitation of the web-based storage, PhoneGap works quite well with the database driven, simple GUI app (and most of the database driven apps currently has a simple GUI anyway). If you gonna develop that kind of app, then stick with it
check out using ionic, backed by angular.js to offset some of the cons mentioned in the accepted answer. Tutorial for launching an employee directory app: http://coenraets.org/blog/2014/02/sample-mobile-application-with-ionic-and-angularjs/
#Gajotres wrote a great response, but hybrid app performance has come a long way since 2012. I answered a related question that covers the difference between hybrid and native app development in 2017.
The moral of the story is that hybrid app development has improved tremendously in the past few years, but it still cannot match native for certain use cases.
With tools like Ionic (first released in 2013) and React Native (first released in 2015) it is easier than ever to build hybrid apps with native-like components. Hybrid apps are now faster, less buggy, and able to interact more deeply with the native UI.
The threshold for hybrid app performance is substantially higher than just a few years ago, but there is still a point at which you may need to develop your app in a native language.
Original Answer:
Yes, the general sentiment is that Hybrid apps are inferior to Native
apps. While this can be frustrating for developers more familiar with
web technologies, it does come for good reason:
Inability to interact with native components: Although plugins such as cordova-plugin-statusbar exist, there are limitations
interacting with and manipulating native components using web
technologies. One great (and frustrating) issue I have personally run
into is the inability to have an input at the top of they keyboard as
the keyboard animates in. This sounds like a nonissue until you look
at an app where this is an essential feature such as in a chat app
like Slack.
300ms delay: Although modern browsers are beginning to phase this
out,
the fraction of a second delay present on Hybrid apps makes the app
feel slow and non-native. This issue is becoming less of a factor as
more users adopt workarounds such as
FastClick.js and some
frameworks such as Ionic eliminate it
by default.
The haters are right (sort of): While Hybrid app development has come a long way, there are still minor glitches and laggy
functions that are just not present in a Native app. Screen
transitions, app switching, and battery life are still common areas
for bugs to appear and likely will be for some time, even if they are
starting to become less and less noticeable.
There are some great Native solutions: With newer languages such as Apple's Swift it is becoming easier to
code in a Native language. That being said, tools such as React
Native fall into a gray
area between Native and Hybrid by allowing developers to code in
friendly technologies such as JavaScript but compile into native code.
The moral of the story is that it really depends what is important to
your specific use case. Hybrid apps have become a viable option and
are no longer an embarrassing side show. Conversely, there are still
minor aspects of interacting with the Native UX that are not yet
possible except with a Native app.
Overall, I recommend mapping out your project and determining if your
app needs any of the benefits of a Native app. With tools such as
Ionic View app it is easy to put together a
basic mockup of your app and test on a real device whether or not a
Hybrid app will work for you.
There's also AppGyver Steroids that unites PhoneGap and Native UI very well.
With Steroids you can add things like native tabs, native navigation bar, native animations and transitions, native modal windows, native drawer/panel (facebooks side menu) etc. to your PhoneGap app. Basically, anywhere CSS + JS don't cut it, Steroids reaches into the native layer to perform the action.
Also, with steroids, you can (although you don't have to) use multi-page architecture (multiple webviews) rather than single. With single page apps, all things like transitions are just CSS workarounds, and as Mani said, even modern tablets and phones aren't fast enough to make them smooth. It's always obvious when it's a phonegap app, especially when you've got a bunch of processes going, or if you're scrolling since JS processes are haulted (being fixed in iOS 8).
Using the multi-page architecture means you get 100% native performance (because those parts actually are native). And unlike phonegap, you'll get consistent user interface behavior and easier debugging (with a single page app, it's often difficult to recreate a particular state in your app). Multi page makes it far easier to develop and maintain your apps since your codebase stays cleaner.
Check the demo: http://youtu.be/oXWwDMdoTCk?t=20m17s
I also find a every good article here http://www.comentum.com/phonegap-vs-native-app-development.html, it compares these two ways in different categories.
The summary is as below:
Design of Interfaces (Same)
Cost (Hybrid has Advantage)
Development Timeline (Hybrid has Advantage)
User Experience and Performance (Native has Advantage)
Maintainability (Same)
No Limitations (Native has Advantage)
Security (Same)
Support and Resources (Native has Advantage)
Tools and Debugging (Native has Advantage)
Platform Independent (Hybrid has Advantage)
Popularity (Same)
One overlooked of the great options here is development with Xamarin.
Though it doesn't help to utilize OP's web developer skills, it has many pros compared to PhoneGap and almost no cons.
Xamarin vs PhoneGap Pros:
Mature framework providing access to the most (if not all) native
features of mobile devices.
Learn only one language (C# for the most developers) for all mobile
platforms.
Have a performance of native apps on iOS/Windows Mobile (since app is compiled into the native code) and very close one on Android (it still compiles to a native APK, but has to have a thin wrapper that translates .NET class library API into Android classes API at the runtime).
Maintained by Microsoft which supports the overall generous quality of the
platform itself and development tools. For instance, you will use Visual Studio and it's probably the best IDE around and now has free Community edition with every feature available that you'll need for Xamarin development.
Xamarin vs PhoneGap Cons:
Needs some time investments for pure web developers to switch to C#
and Xamarin class library API.
Therefore, Xamarin is a very solid option for cross-platform development nowadays.

iPhone/Android webapp wrapper

I work at a large company that is looking at building apps for internal use only (iPhone/iPad). We are looking for a SIMPLE way of creating apps that essentially are just a web browser with a predefined URL and no address bar/tabs, etc. Essentially a very dumbed down browser with a custom logo. What is the easiest way to accomplish this?
We would obviously be distributing these oursevlves and they wouldn't be available in the App Store, so app guidelines aren't an issue. We are on Windows boxes and are Java/Web developers so we'd rather not get into too much C sharp if at all possible, fyi. Basically it'd be nice if the tool (if one exists), were to allow us to give it a URL, an icon image, and it builds the app from there.
And while we are starting out with Apple devices, we need to be cross platform compliant with whatever tools we use because I can imagine the day when they decide to buy Android or WindowsPhone devices later on.
MobiOne? PhoneGap? Appcelerator Titanium SDK? Can either of these do what we need? Something else?
A big 'No' for MobiOne. I bought it for 99 dollars. As they advertised, I was able to create a static app within hours. But that's pretty much what MobiOne can do. The moment you start using html, javascript or even audio, all sorts of problem seem to creep up. And there is no support in their forums either. My basic question about using the audio player remains unanswered for a month now.
Here is the worst part:
The tool has a poorly built emulator. Often times, my app worked fine in the emulator but failed to run when deployed to a real device. And at times, i have seen the vice versa too.
Since then, I switched over to PhoneGap(which is free). It took me 2 days to just set my environment right. But once I had the environment setup, it took only minutes to deploy my app in to a virtual device.
Looking at your requirement, I would say that your safe bet is PhoneGap.
I don't have a working knowledge in Titanium but I read in a lot of forums that it supports less platforms when compared to PhoneGap. Titanium seems to give a more native feel to the app but that also means you cannot port it to multiple platforms without changing the code.
Apple may reject your app if all it does is wrap a web site in a WebView. You need to have more functionality in your app than just loading a web page.
From the app review guidelines for iOS:
2.12 Apps that are not very useful, are simply web sites bundled as apps, or do not provide any lasting entertainment value may be rejected
You would need to add additional screens to the app like an about page and a contact us page in order for your app not to be rejected.
As you say you know JavaScript, look into appcelerator.com it allows you to build cross platform apps and only writing your code once.
I would re-evaluate your reason for wanting to create these projects as an app in the first place. What app functionality do you want that you don't have now with your web page? You didn't mention anything in your question that would indicate this needs to be an app.
On Apple devices, you could create an icon that points to a web site. You could define the pages in a way that hides the address bar. Lastly, the web pages could easily be cross-platform already.
Wrapping this into an app would just possibly complicate the process. You may need to deploy updated app code to the device, where a refresh in a browser works just as well.

Appcelerator vs Android SDK

I have been looking at appcelerator it seems pretty fine! Without a doubt, one of the advantages of appcelerator is its support for multi-platform. I am interested in building an android app and maybe a iphone app later on. So it is not crucial to support multiple platforms at the moment.
If you disregard supporting multiple platforms and just focus on android development. Is appcelerator still advantageous? Does it lack any features of "Android sdk"?
(When I say "Andorid sdk" I mean development with Eclipse with native Android sdk, if it makes any sense)
We looked at Appcelerator when starting our Android project. We knew we would have to do an iOS client next, so Appcelerator was enticing.
We decided not to go that route because it doesn't support all the native features of each device.
For example, we decided early on that our user interface in Android would need a widget. No support for that in Appcelerator, as it's specific to Android. [This was a few months back -you may want to check again].
Compromising on the user interface was too much for us. We decided to go with C/C++ for the app logic and use Android SDK for the user interface.
Our apps now have two pieces: C/C++ as much as possible to the "brains" and the native (Android/Cocoa Touch) for the UI to take advantage of the UI experience.
Works of course for platforms that can integrate C/C++.
The parting advice: design your user interface first, then find a tool that can implement it. Users have high expectations of the UI in portable devices. Compromising on it early on may be the KOD for your project.
[EDIT] Every so often I see an upvote for this question. I would like to update with what we learned in the past two years:
Using C/C++ for the common parts of our application has paid off. It does require a slightly more complicated build process, but the savings are gigantic if the piece of code being shared is complex (as in our case).
For the user interface piece we are beginning to look into hybrid apps (some UI elements in HTML). There are still debates out there about HTML interfaces (Facebook and LinkedIn are two that move to native code for the UI), but also some reports that when chosen carefully it works. There is a great talk from Flipoard on that; with slides here.
UPDATE Oct/2014
In March/2014 Smashing Magazine published an excellent article comparing native iOS, native Android, PhongeGap (Cordova) and Appcelerator Titanium. They show the development of a simple app in each environment.
This is the last part of the series. At the top of this part there are links to the previous parts of the series and at the bottom there is the comparison of the approaches. There are also interesting comments from readers at the end.
UPDATE May/2015
Still get an upvote for this question every so often, so I would like to share what we have done since I wrote the first part of the answer.
We are now working on a project that also has a web client. We have now the iOS client, the Android client, plus the web client.
JavaScript is the natural choice for the web client.
Since we want to share as much code (at the business logic layer) across these clients, it means we need to find a way to run the JavaScript code in iOS and Android.
And that's what we ended up doing.
This is a summary of how we handle it:
For all clients: all data structures are defined with Google's protobuf. This allows to automatically generate the serialization/deserialization code for iOS and Android.
iOS: run the JavaScript code with the help of JavaScriptCore (a good overview here).
Android: run the JavaScript code with the help of Google's V8 engine.
The bridge between JavaScript and the iOS/Android layer can be a bottleneck, especially the serialization of the objects. We had to optimize a few things and learned a few lessons to stay out of trouble.
Generally the experience has been positive. We saved significant amount of time by sharing the code across all clients.
If I had to start another project like this one (that requires sharing code with web and mobile clients), I would also take a look at what Google did for inbox. It wasn't available when we started. Looks promising.
UPDATE August/2015
And the world keeps turning...
I would also take a good look at React Native if I had to start a new mobile app now.
It's based on JavaScript, bridging web and mobile development more easily.
There is a great tutorial in Ray Wenderlich's site.
UPDATE February 2016
My shortlist for cross-platform development is down to two:
ionic
React Native
I've been paying more attention to ionic because our web app uses AngularJS and so does ionic (Cordova + AngularJS). React Native will force the team to learn another framework (of course the argument is the opposite if your web app uses React).
Nevertheless, I'd seriously consider React Native, even having to learn another framework, because of the reported performance and look-and-feel of the app. From React Native's site:
With React Native, you can use the standard platform components such
as UITabBar on iOS and Drawer on Android
If you are starting now, I recommend you take the time to at a minimum complete their tutorials so you get a better feeling of each framework. Each tutorial can be complete in one to two hours:
ionic tutorial
React Native tutorial
For a simpler approach: Smashing Magazine just published (at the time I wrote this update) a good article showing how to use the native navigation elements to make the app feel (well...) native, while using web views to render the content. The article goes into the details of how to make the HTML/CSS usable in the mobile devices (it's not just pushing the HTML/CSS you already have).
If you only focus on develop apps for Android platform, I recommend you should use native Android (Eclipse + Android SDK as you said) instead Titanium.
Reason: Titanium is suitable if
You want to develop apps quicly, or
Your apps is simple, or
You see Java is so difficult (maybe :p ), so you choose the easier (Javascript of Titanium).
And here is the reasons why you should use native Android instead Titanium:
You want to develop a complex app, or
You want to customize app appearance. It's very important. Imaging you make an app for client, and they need their app to be customized for more eye-catching. Choosing Titanium means you must use their control, which lacks of ability to customize. It'd be better if using native Android that you can customize everything you want.
that is a very difficult question to answer without any specifics regarding the requirements of the application.
I would suggest you take a quick look at the API documentation of Appcelerator to see what the framework provides and also take a moment to list the basic requirements of your application and then determine what tool will be best for your project.
I think you are onto a good start using Appcelerator, since it uses JavaScript, etc. Easy to learn, but good examples. It will also enable you to use the same code and reach iPhone,iPad apps. Learning to use just the Android SDK is more complicated. Even then you still need to develop later iPhone etc apps. If you come from a web background this makes sense. There are good video's for quick learning. Good Luck
My experiences with Appcelerator seem to suggest they are more of an iOS shop. Their toolset for Android is, IMHO, quite lacking. ADT supports visual UI building and debugging on device, which Titanium Studio does not. There has been a bug filed about this for several months now, and it continues to be delayed. If your focus is Android, use Google ADT or MOTODEV Studio for Android. These IDEs are quite nice and are used by professionals.
The above answer presents a great way to develop mobile apps. DO NOT COMPROMISE ON A HIGH-QUALITY USER EXPERIENCE.
Lacking of bluetooth support is a huge deficiency for Appcelerator and no one gives a clue about roadmap.
edit : appcelerator now have BT support in Tizen 3.1
Well, in the new version of appcelerator (APPCELERATORSTUDIO 4.0) you can have alloy projects, and something like css files for your UI (tss), so in fact they are really customizable.
Greatings
Appcelerator has a lot of support and it really easy to use. It supports 100% of native api calls now. They have really good documentation too.

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