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Then imagine a newer version of note. Many computer systems contain data in incompatible formats. Exchanging data between incompatible systems or upgraded systems is a time-consuming task for web developers. Large amounts of data must be converted, and incompatible data is often lost. XML stores data in plain text format. This provides a software- and hardware-independent way of storing, transporting, and sharing data. XML also makes it easier to expand or upgrade to new operating systems, new applications, or new browsers, without losing data.

With XML, data can be available to all kinds of "reading machines" like people, computers, voice machines, news feeds, etc. HOW TO.

XML File (What It Is & How to Open One)

Page address:. For example, if you have an array of strings you want to display in a ListView , initialize a new ArrayAdapter using a constructor to specify the layout for each string and the string array:. Then simply call setAdapter on your ListView :. To customize the appearance of each item you can override the toString method for the objects in your array. Or, to create a view for each item that's something other than a TextView for example, if you want an ImageView for each array item , extend the ArrayAdapter class and override getView to return the type of view you want for each item.

XML - Overview

When you instantiate the SimpleCursorAdapter , pass the layout to use for each result, the Cursor containing the results, and these two arrays:. The SimpleCursorAdapter then creates a view for each row in the Cursor using the provided layout by inserting each fromColumns item into the corresponding toViews view. If, during the course of your app's life, you change the underlying data that is read by your adapter, you should call notifyDataSetChanged.


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This will notify the attached view that the data has been changed and it should refresh itself. You can respond to click events on each item in an AdapterView by implementing the AdapterView. OnItemClickListener interface.

For example:. Layouts are used in the Sunflower demo app. Content and code samples on this page are subject to the licenses described in the Content License.

What Are Markup Languages?

App Basics. Build your first app. App resources. Resource types. App manifest file. App permissions. Device compatibility. Multiple APK support. Adding wearable features to notifications. Creating wearable apps. Creating custom UIs. Sending and syncing data. Creating data providers. Creating watch faces. Android TV. Build TV Apps. Build TV playback apps.

Help users find content on TV. Recommend TV content. Build TV channels. Android for Cars. Android Things. Developer kits. Advanced setup. Build apps. Create a Things app. Communicate with wireless devices. Configure devices. Interact with peripherals. Build user-space drivers. Manage devices. Create a build. Push an update.

Chrome OS devices. Core topics. Interact with other apps. Handling app links. App shortcuts. App widgets. Architecture Components. Data Binding Library. Paging Library. How-To Guides. Advanced Concepts. Threading in WorkManager. Intents and intent filters. User interface. Improving layout performance. Custom view components. Look and feel. Add the app bar. Control the system UI visibility.

Supporting swipe-to-refresh. Pop-up messages overview.

Adding search functionality. Creating backward-compatible UIs.