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Mobile Development Articles
Page 146 of 156
Android AsyncTasks Parallel Execution
Before getting into the example, We should know that, What is asyncTask. AsyncTask is going to do operations/actions in background thread and update on mainthread. Here is the simple solution about Android AsyncTask Parallel Execution.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. In the above code we have declare two imageviews and one button, When user click on button it going to download two images from different ...
Read MoreHow to cancel an executing AsyncTask in Android?
Before getting into example, we should know what is AsyncTask in android. AsyncTask going to do operations/actions in background thread and update on mainthread. While doing background operations on background thread, user can cancel operations by using the following code -AsynTaskExample mAsyncTask = new AsyncTaskExample(); mAsyncTask.cancel(true);This example demonstrate about how to cancel an executing AsyncTask in android.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. In the above code when ...
Read MoreLazy loading of images in table view using Swift
To load an image in table view cell we’ll go through a series of steps.Create a table view, table view cell and add an Image view to it.Assign a custom class to the cell we created.In the cell for row at method write the following lines of code.let cell = tblView.dequeueReusableCell(withIdentifier: "CustomCell") as! CustomCell return cellTo download the image we’ll create a function and embed that into an extension.func setImageFromUrl(ImageURL :String) { URLSession.shared.dataTask( with: NSURL(string:ImageURL)! as URL, completionHandler: { (data, response, error) -> Void in DispatchQueue.main.async { if let ...
Read MoreHow to use the front camera in Swift?
To use the front camera in swift we first need to get a list of cameras available in the device we are using. In this article we’ll see how to get the list of devices and then check if the front camera is available or not. We’ll do it in a series of steps.Import AVFoundationCheck if the list of cameras existsFilter out the front camera if exists.guard let frontCamera = AVCaptureDevice.devices().filter({ $0.position == .front }) .first as? AVCaptureDevice else { fatalError("Front camera not found") }The devices() method of AVCapture returns the list of cameras available. From that ...
Read MoreHow to renew distribution certificate for iOS?
To renew a distribution certificate on mac we’ll have to go through a series of steps mentioned below.Use spotlight to open keychain access on your macFrom keychain access menu select Certificate Assistant -> Request certificate from certificate Authority.Fill the information there like Name, email and choose “save to disk”.Click continue and save to your desired location. This will generate a .CSR file which we’ll need to upload to the developer portal while generating our certificate.Go to “developer.apple.com”, login to your account, select “Certificates, IDs & Profiles”.Go to certificates, select production and click on the “+” on the topSelect "App Store ...
Read MoreHow to create NSIndexPath for TableView in iOS?
Index path is generally a set of two values representing row and section of a table view. Index path can be created in objective C as well as Swift as both are native language of iOS Development.IndexPathForRow is a class method in iOS. To create a index path we need to be sure about the section and row we need to create. Below are the methods of creating an Indexpath.To create an IndexPath in objective C we can use.NSIndexPath *myIP = [NSIndexPath indexPathForRow: Int inSection:Int] ;ExampleNSIndexPath *myIP = [NSIndexPath indexPathForRow: 5 inSection: 2] ;To create an IndexPath in Swift we ...
Read MoreEmail & Phone Validation in Swift
To validate email and phone in swift language we can use multiple conditional statements like if conditions, but that’s a long process and may contain 50-100s of if statements to validate email.So instead of conditionals we’ll use Regular expression. Swift provides NSPredicates which we can use to evaluate a regular expression and test them.Let’s see how we can use regular expressions to do the same.We’ll create a function which we can use as extension of String class or UIViewController to use through out the project.Add the following code to any class in your Project, or create a separate swift class ...
Read MoreHow to subtract 1 hour from current time using Swift?
To subtract hours from a date in swift we need to create a date first. Once that date is created we have to subtract hours from that, though swift does not provide a way to subtract date or time, but it provides us a way to add date or date component in negative value. In this example we’ll see how we can achieve the same.Let’s create a date first, let it be today, let today = Date()Now to modify this date we’ll use the add function with negative value, let modifiedDate = Calendar.current.date(byAdding: .hour, value: -2, to: today)!Now to see ...
Read MoreDetect current device with UIUserInterfaceIdiom in Swift
To detect current device with iOS/Swift we can use UserInterfaceIdiom. It is an enum in swift, which tells which device is being used.The interface idiom provides multiple values in it’s enum which are.case unspecified @available(iOS 3.2, *) case phone // iPhone and iPod touch style UI @available(iOS 3.2, *) case pad // iPad style UI @available(iOS 9.0, *) case tv // Apple TV style UI @available(iOS 9.0, *) case carPlay // CarPlay style UIIn swift interfaceIdiom can be used in the following way:print(UIDevice.current.userInterfaceIdiom) if UIDevice.current.userInterfaceIdiom == .phone { print("running on iPhone") }When we run the above code ...
Read MoreHow to get the current version of my iOS project in code?
When we build an iOS application, by default it get a version 1.0 and build 0. Whenever we upload a new build to the app store, we need to change the version number. We can update the build number for testing builds. The version and build number are stored in the info.plist file in our project.Sometimes we might need to access the build or the version number in our application to perform some custom action.To get the version number we can use the following code and assign it to a variable or constant.Bundle.main.object(forInfoDictionaryKey: "CFBundleShortVersionString") as! StringTo get the build number ...
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