I have developed a Hybrid Mobile App using MobileFirst 7.1 and now I want to ask user about how they like the app. My app displays alert with 3 buttons which display "Not Now", "Rate It" and "Never". Depending upon the option they select, I want to save the user preferences locally in the devices(Android or iOS) so that according to the selected option I can control the alert. How can I achieve this?
Your use case is similar to this question, and the solution I would recommend is the same. Data that you want to save persistently on the client device (such as user preferences) could be saved in JSONStore documents. These are stored locally, and will persist across executions of the application.
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I want to create a functionality in react-native app such that on pressing a particular button, it should get me to the "open with" window, and that window should fetch me the list of all the installed applications in the phone which can run audio files. How can i get such list?
On a Android system, that "Open with" screen pops up when:
The user have more than one application that can play that specific audio format(Because it's not every app that can run every audio format).
The user did not set-up a default app to open the audio format.
So, You should just use a library like rn-fetch-blob to open the file for you, like as follow:
RNFetchBlob.android.actionViewIntent(fileLocation, mimeType)
And android will take care of picking the right app for you.
In case this answer does not satisfy you, you can get a list of apps using react-native-android-installed-apps-unblocking, but there's no information about wich ones can run an audio file, and maybe IOS will have some restrictions about what can be done, so your best option is to let the system do that for you!
Is it possible to 'hack' or develop an app that lets you launch an app by pressing an iPhones power button or volume buttons or possibly from the passcode screen?
As an example: pressing the power button 5 times launches the app or sends an emergency SMS. Or entering a certain code into the passcode / lock screen sends an SMS
No. All these features are managed by a different process than your application, and you cannot directly influence that process. You can develop a JailBreak tweak that will allow you to do so, but obviously this is not for Apple AppStore.
What you are asking about is against the Apple Developer TOS. If you do it, you will not pass the App Store Review process and hence will not be able to distribute vie the iTunes App Store. If you don't care about that, then there may be jail break hacks that can help you with that.
I have an app that has 2 parts: A preference pane and an app that runs in the background.
I need the user to input some secure data in the preference pane, the pane then saves it to the keychain. My question is, what is the best way for the preference pane to tell the app to update from the keychain?
Let me know if you need anymore information
Thanks in advance.
Use NSDistributedNotificationCenter. The API is similar to NSNotificationCenter except that a distributed notification can be posted and received across process boundaries. So in your case, the preference pane would post a distributed notification with some unique name, and the app would register for that notification to know when to update from the Keychain.
With windows 8, is it possible to create an application that is always visible? For instance, in previous versions of windows, there is the task bar with quick launch icons. Can I create something similar to the quick launch icons that are always on the screen?
If you are referring to a Windows 8 Store app then the answer is no. You can have a live tile and toast notifications that provides updates to the user which may cause the user to launch your application.
A good article to read to understand how your Windows Store apps will run on Windows 8 go here to learn about Application lifecycle (Windows Store apps). This will explain the App execution state.
It is not possible in the RT version, but the same is possible in the desktop version. If you have a desktop app, you can pin it to the taskbar. But any Window store app cannot be pinned to the taskbar. What you can do instead is move the app to the beginning of your Home screen, so anytime you click the Windows button your app will be visible right in front.
Do you mean always visible in the Star Menu screen? If so, you can add tile updating functionality to your application. As long as the user has the application pinned to the Start Menu, he would see the updates. Check the link below for an introductory tutorial.
http://blogs.msdn.com/b/windowsappdev/archive/2012/04/16/creating-a-great-tile-experience-part-1.aspx
"Quick Launch" has a very specific meaning, which you may or may not have been referring to in your question.
Below is the Quick Launch bar in Windows 8 - essentially a toolbar pointing to a location in your %AppData% directory. Prior to Windows 7 it was available by default, but the ability to now pin items directly to the taskbar rather supersedes it. Here's how you can restore Quick Launch if you really want to :)
It's, of course, available only in the Desktop mode and not on the Modern UI, where pinning a tile is the best you can hope for, and it's all up to the user to pin it AND to determine where it shows up on their Start Screen.
Another option worth mentioning (although more like system tray than quick launch) is lock screen presence. If the user chooses so and your app supports that, he can add it to his lock screen:
either as a a badge (up to 7 apps)
or as a tile notification (single app only)
This is not a way for the user to quickly start your app (other answers have already covered these options) but a way to stay visible and keep your user informed.
I am developing an iOS app that allows users to download documents off a server. I have gotten this to work fine and they can even view the document. What I want, though, is for the document to have an 'Open In' action so, when a button is pressed, the user is able to select another application that allows you to look at PDF documents -- for example, the Kindle App. Is this possible?
Darn, I was wishing you were going to say "MacOS" because that would have made the answer a lot more fun (and do-able).
As far as I know, iOS still does not have an official SDK-legal way to have one app (your app) arbitrarily launch other app and specify an arbitrary document to open with it. This is part of the magic (?) of having to live within your own app sandbox.
On the Macintosh, this would be easy with Apple Events (among other things).