Orientation when OnCreate is called (this will happen each time aĭevice is rotated), it must detect the orientation, and then load theĭesired user interface code. If an application tries to load a different user interface for each Results in the application displaying the TextView as shown: RelativeLayout and setting the RelativeLayout as the content view After the TextView is created, adding it to the ![]() Controls also have LayoutParameters, such as the TextView in Instance of a layout is created, controls can be created and added to Of encapsulating how controls are positioned in a reusable way. This code creates an instance of a RelativeLayout class and sets its Var layoutParams = new RelativeLayout.LayoutParams (, ) protected override void OnCreate (Bundle bundle) TextView control added to a RelativeLayout, as shown in theįollowing code. To add controls programmatically, an application needs to perform theįor example, consider a user interface consisting of a single When we add controls programmatically, an application must manuallyĪccount for device orientation, which is handled automatically when we Reasons, including technical limitations, developer preference, etc. When the device is rotated, the drawable changes for the given Let's further assume that a different version of Monkey.png is included Resources/drawable folder, where the drawable is referenced from an Resources/drawable and Resources/drawable-land folders,įor example, say the project includes an image named Monkey.png in the In this case, the system gets the drawables from the Running this code and rotating the device from portrait to landscapeĭemonstrates the new XML loading, as shown below:ĭuring rotation, Android treats drawable resources similarly to layout Version of the code, but uses a different string in the TextView): The landscape version of the Main.axml file that contains the followingĬode (for simplicity, this XML is similar to the default portrait Will now result in Android loading the newly added Main.axml. If a folder named layout-land that contains an additional Main.axmlįile is added to the project, inflating the layout when in landscape Suppose the Main.axml file contained the following XML: Layout-land), an application can define the views it needs when in In addition to the layout folder (which defaults to portrait and canĪlso be explicitly named layout-port by including a folder named Inflated, as shown in the screenshot below: OnCreate method is called again and the same Main.axml file is If the device is rotated to landscape orientation, the Activity's When the Activity's OnCreate method isĬalled, it inflates the view defined in Main.axml, which declares a This project creates a single Main.axml file in the Consider the project structure created by Landscape orientation if no additional layout resources are provided This folder's resources are used for both portrait and Resources/layout folder are used for rendering views for anĪctivity. Layout Resources – Specifying which layout files areĭrawable Resources – Specifying which drawables are loadedīy default, Android XML (AXML) files included in the ![]() ![]() Handling Rotation Declaratively with Layoutsīy including files in folders that follow naming conventions, AndroidĪutomatically loads the appropriate files when the orientation changes. Programmatically as well as how to handle orientation changes Programmatic Layout Rotation – How to add controls How to load both layouts and drawables for particular orientations. Resource system to build orientation-aware applications, including This guide examines the following orientation topics:ĭeclarative Layout Rotation – How to use the Android To opt out of the Activity restart and take manual control of This allows finer control at runtime, but at theĮxpense of more work for the developer. For programmatic layout, changes mustīe handled manually. Rotated device, an application can benefit from the tight integration When automatically handling declarative layout changes on a User interface is created declaratively in XML or programmatically inĬode. Android provides a sophisticatedįramework for dealing with rotation within applications, whether the Overviewīecause mobile devices are easily rotated, built-in rotation is a It covers how to work with the Android resource system to automatically load resources for a particular device orientation as well as how to programmatically handle orientation changes. This topic describes how to handle device orientation changes in Xamarin.Android.
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