Develop Reference

Dynamically alter App Icon on iOS and Android

I'm fairly new to Flutter but have found that it fits most of my design needs for iOS and Android. But, I've been unable to find a way to dynamically change the app icon.
In Swift, you were able to change the app icon from inside the actual app allowing for some pretty neat customization. A Medium article discussed this back when it first came out for iOS 10.3.
Does anybody know of any way to do this in Flutter, or will I need to make a custom package to do this?

https://medium.com/flutter-community/programatically-change-ios-app-icon-in-flutter-c9e84bc541a2
Maybe this would help. Here's a plugin too.
https://pub.dev/packages/flutter_dynamic_icon

I don't believe this is currently supported, and probably won't be by the flutter team although someone could theoretically write a plugin to do it. However, most of the configuration needs to be done natively anyways, so I don't know how much value the plugin would provide other than doing the call to setAlternateIconName.
What you should do is write the code directly in iOS as you would for a native iOS app, but expose a MethodChannel to the dart side which would allow you to control it from flutter.

Is it possible to develop mobile keyboard app in flutter

We want to develop mobile keyboard app - (Third party keyboard) that have some unique features (such translate on the keyboard).
We would like to know if there is a way to developed it once both for IOS and Android, with Flutter, or any other solution?

There's a long and a short answer to this. The short answer is basically no, it's not feasible at this time to do this.
The long answer is that it may be somewhat possible but with a fairly large amount of work for you to do. You're going to have to first create and appropriate project type in android and ios, and then import the dart code & set up the build. You may be able to start with a normal flutter application and modify the xcode/gradle builds to match the specifics for ios/android, but I'd guess that's somewhat unlikely. So you'll probably still have to maintain two separate projects, but which could import the same dart library for the UI.
Because Android and iOS use different APIs for their keyboards, you're going to need to write a Platform Plugin or at least method channels which communicate between your app and the native code, for each of iOS and Android. You'll also probably have to embed the flutter view yourself - see this example as I'd bet the normal FlutterApplication etc won't apply.
I'd guess that on android you could probably get this to work eventually with a lot of work (depending on how familiar you are with android, platform channels, and integrating libraries such as flutter's into the build); on iOS you might have luck but it's somewhat conceivable that iOS blocks certain features that flutter needs in the keyboard for performance or security reasons - just guessing from my experiences developing apps in native iOS although I haven't done a keyboard specifically.
That being said, if you do try this I'd be interested to hear the results, and if you were to go about it in a somewhat generic way that could be re-used it would be of great benefit to the flutter community!

iphone to android converter app without breaking it's features

I'm looking for a good converter that will export an iphone/xcode app to an android platform. I was wondering if there is any.

Android and IOS use completely different concepts of programming. I don't think cross-compiling will ever be possible.
If you want to run one Code on several platforms, you'd have to use one of the Multiplatform approaches like Xamarin or PhoneGap.

Nothing of the sort exists. There is a doubtful rumor that android, because Swift is open source, could adopt some of Swift, in which case you could easily port your code. However, nothing currently exists to do so.

React Native & Android?

I'm contemplating on using React Native for a new web app. Is it possible to ship both iOS and Android apps using it?
I know that it's on the roadmap, but it's unclear to me whether it's going to be a separate open-source project (e.g., React Android vs React Native), or just one (e.g., React Native).

TLDR: Most likely you can. But it depends on your use cases.
You can aim for about 80~99+% code reuse (depending on how much Android/iOS native views/modules you use eg. Do you have custom graphics code or low-level TCP networking code; Those can only be done in native code; And expose as API to your JS code. The amount of the platform-specific JS code is actually minimal. Plus you can also use platform check like if (Platform.OS === 'android'){} to solve that) of code reuse, which is pretty nice. Dropbox and other companies have done similar projects: using c++ to build a 'shared' component between iOS and Android project, while implementing most of the UI code in native iOS(Objective-c or swift) and Android(java). But now you are doing C++ with Java and Objective-C or Swift, more language to master, more complexity and more brain juice went down the drain. And it probably took some super tough gymnastic move to make different native code work in both iOS and Android, plus debugging...
React Native just makes it a lot easier to write almost everything in JavaScript. But there is a catch, only about 80% of the JS code could be shared. In the foreseeable future, you still need to write 'platform-specific' JS code for Android and iOS versions.
That's why FB said they aim for 'Learn once, code anywhere' instead of 'run' everywhere.
But it's still very nice other than code reuse(80+% code reuse is still a big improvement comparing to maintaining 2 entirely different versions: Android and iOS ya?)
Cmd +R to refresh the app is a GREAT boost for development speed. Waiting for a big project to compile just makes you felt you were dying inside.
Declarative UI you get for free, because of using React. This is another great plus! As you don't need to 'dig' into your specific UI code that often anymore. Data changed? Just 'flush' it and UI just update accordingly. No brain juice wasted.
I just ported my not so complicated Android React Native App to iOS. And it took me 3 days. The request for and iOS version for the App came as a rather abrupt and unplanned move. So could definitely be even faster had I built the Android with a plan for iOS too. Huge win:)
Another great benefit is able to do hot code push without going through the hellish 1 week app store review process. So no more, "YAY, our app is approved. Let's release. Oh Shiiit. Critical bug and our app keeps crashing(that's gonna keep happening for at least a week before your fix is live). And you have to beg Apple to speed up the process". This is possible because the major part of the code base would be written in JS and with tools like AppHub or CodePush, you could almost instantly deploy code to your users. This is conditionally allowed by Apple.
3.3.2 An Application may not download or install executable code. Interpreted code may only be used in an Application if all scripts, code, and interpreters are packaged in the Application and not downloaded. The only exception to the foregoing is scripts and code downloaded and run by Apple's built-in WebKit framework, provided that such scripts and code do not change the primary purpose of the Application by providing features or functionality that are inconsistent with the intended and advertised purpose of the Application as submitted to the App Store.
Lastly, as an open-source project, project longevity tends to be a concern. Not an issue for React Native. Internally used by(FB Ads Manager) and backed by FB(a dozen FB Engineers?) by Facebook, with close to 500 contributors and 25k Stars, React Native is full of life. Seeing is believing :) (https://github.com/facebook/react-native)
EDIT 1
I realized that I am apparently a bit biased and only talked about the good stuff about React Native. So do checkout https://productpains.com/product/react-native/ and Github issues to have a full picture. It's definitely not silver bullet. That being said, it satisfies most of my use case and I couldn't see me use native iOS or Android anytime soon.
EDIT 2
The Facebook F8 conference app released by Facebook (duh..) is 100% open source and they have a really nice tutorial to show you how you could have both iOS and Android native experience(90% as good as native ?), and at the same time, achieved 85% code re-use. check it out --> https://makeitopen.com
EDIT 3
You may also want to checkout Flutter and its pros & cons :)

It doesn't make sense to have a single codebase if you want a truly native experience. At the moment we have things like NavigatorIOS in React Native which provides an iOS-style UI for navigating between app screens, but if we were to just start using that on Android it wouldn't feel like a true Android app.
Therefore I'd expect to see a NavigatorAndroid component or similar when the time comes, and the same for various other components that behave differently between the platforms.
One benefit that you would get is that any application logic - maybe a store, or your backend interactions - could be written in a JavaScript file and then included by both iOS and Android.
So while you won't get that write-once run-everywhere developer experience from React Native I would expect to see a solution that gives first-class UI on both platforms while encouraging as much reuse as possible. I personally also hope to see strong build tools to help develop and ship on multiple platforms.

React Native for Android has just been released, Android folder will be creating along side with iOS folder upon creating a new project.

Just another tip as NavigatorIOS was mentioned. Facebook are not really maintaining the code for NavigatorIOS. Instead they are focusing on Navigator.

Yes. We're running it in production with about 5m registered users.
Some things are a little behind iOS but catching up quickly. It's a good wagon to be on.

React Native is designed so that you can deploy to both iOS and Android. There is a caveat, of course.
React Native has supported iOS for much longer, coming to Android only recently. So, there are some differences in terms of what is supported on each platform.
For example, if you place borders on Text, they will show up on iOS, but not on Android. In order to overcome this, you need to place a View around the Text, and apply a border to that. Luckily, React Native makes it easy to integrate separate stylesheets for each platform (or even platform-specific styling on a single stylesheet).
Support for Android is continuously evolving, so it will only be a matter of time before React Native for Android is on par with iOS. Nevertheless, this shouldn't deter you. In my experience, it's a great way to quickly develop for both platforms, and it does save some headaches.

you don't need to maintenance separate code base for android & ios. Actually you can use same code base for build android & ios. I recommend to read the react-native documentation(according to react-native version you are using) before using any inbuilt component in your code.
Eg:- TextInput component onKeyPress function supports for ios only.
if ur are using external lib check these lib support for both ios and android.
Anyway you have to configure external lib separately(install) both android and ios.
hope this will helpful.

How to write android code in titanium

I had been working on android since a little long. Now I am wondering about titanium. Is it possible to write android (java) code in titanium app since the app is build in titanium? If yes then how? Actually I am having problem dealing with push notification for android in titanium. So I got a solution to build complete app in titanium and then if possible use android code in app to deal with push notification. How? Please do response as quickly as possible. Thanks in advance.

To answer your question directly, you will need to develop a native Android extension to call Java code via JavaScript in a Titanium application.

Rai
You should be checking out the docs Here tells you all you need to know
Hope it helps
Frank

yes it is possible but remember that the titanium tools lag behind the official android ones. Documentation is poor and often wrong, code is laggy and the resulting .apk are much bigger.
Why are you thinking of using Titanium? For cross-compatibility?
If you are thinking about that you have multiple possible ways:
1) Build a minimum common denominator, like titanium, but better: Write a core application for both android and iPhone so that it will be fast and light on memory, with a modified broswer to show your content. This way the interfaces will be much easier and you'll have to write the content just once.
Still you will be able to access low level hardware, like GPS, compass, gyroscope.... easily without consuming too much battery (unlike with titanium) as needed.
2) Find an existing minimum common denominator: Javascript work both on iPhone and Android.
3) There are many other options (Adobe air, python, custom scripting, mobile web site, ...) but I think that the cons outweigh greatly the pros.