Passing it the reference to your layout resource in the form of:įor example, if your XML layout is saved as main_layout. You should load the layout resource from your app code, in yourĪctivity.onCreate() callback implementation. When you compile your app, each XML layout file is compiled into a More information about the syntax for a layout XML file is available in the Layout Resources document. In your Android project's res/layout/ directory, so it will properly compile. For example, here's an XML layout that uses a vertical LinearLayoutĪfter you've declared your layout in XML, save the file with the. Once you've defined the root element, you can add additional layout objects or widgets as child elements to gradually build a View hierarchy that defines your layout. Using Android's XML vocabulary, you can quickly design UI layouts and the screen elements they contain, in the same way you create web pages in HTML - with a series of nested elements.Įach layout file must contain exactly one root element, which must be a View or ViewGroup object. Tip: To debug your layout at runtime, use the For example, you can declare your app's default layouts in XML, and then The Android framework gives you the flexibility to use either or both of these methods toīuild your app's UI. Using XML files also makes it easy to provide different layouts forĭifferent screen sizes and orientations (discussed further in Supporting Different Screen Sizes). YourĪpp can create View and ViewGroup objects (and manipulate their properties) programmatically.ĭeclaring your UI in XML allows you to separate the presentation of your app from the code thatĬontrols its behavior.
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