![]() ![]() In the Add New Item dialog, select Visual C# > Code > Code FileĪnd name the new code file PhoneTranslator.cs: Right-clicking the Phoneword project in the SolutionĮxplorer pane and choosing Add > New Item. The next step is to add some code to translate phone numbers fromĪlphanumeric to numeric. TextView to an empty string and set its Id property your work by pressing CTRL+S. Its Id property to a TextView from the Toolbox to the design surface and Properties pane to change its Text property to Translate and With the Button selected on the design surface, use the Surface and place it underneath the Plain Text widget: ![]() Use the Properties pane to change the Id property of theĭrag a Button from the Toolbox to the design With the Plain Text widget selected on the design surface, Will appear as illustrated in the following screenshot: When the Plain Text (an EditText widget) is placed correctly, it Is moved just below the previous TextView (as shown on the right): Widget cannot be placed (as seen on the left) until the mouse pointer ![]() Widget will not occur until you move the mouse pointer to a place in The Text (Large) widget to Enter a Phoneword::ĭrag a Plain Text widget from the Toolbox to the design surfaceĪnd place it underneath the Text (Large) widget. Use the Properties pane to change the Text property of With the Text (Large) control selected on the design surface, You should change the tag to and add another attributeĪndroid:orientation="vertical" to the LinearLayout opening tag.įrom the Toolbox (the area on the left), enter text into the searchįield and drag a Text (Large) widget onto the design surface For the rest of the steps on this page to work The default layout will be a RelativeLayout.Instead of activity_main.axml, the layout is in content_main.axml.The SQLite database would store the data, which would be accessed via the provider.Newer releases of Visual Studio contain a slightly different app template. Or you can register for the event that the state of the phone changes, e.g., someone is calling.Ī provider defines a structured interface to application data.Ī provider can be used for accessing data within one application, but can also be used to share data with other applications.Īndroid contains an SQLite database which is frequently used in conjunction with a content provider. They can communicate with other Android components and send notifications to the user.įor example, a broadcast receiver can notify the user via the notification framework in Android.Ī receiver can be registered to listen to system messages and intents.Ī receiver gets notified by the Android system if the specified event occurs.įor example, you can register a receiver for the event that the Android system finished the boot process. If not explicitly defined, Android creates a default application object for your application.Īn activity is the visual representation of an Android application.Īn Android application can have several activities.Īctivities use views and fragments to create their user interface and to interact with the user.Ī service performs tasks without providing a user interface. It is the last component which is stopped during application shutdown. Android application components ComponentĪn Android application can have one Application class which is instantiated before any other Android component. ![]() You can define the following components in your configuration files: Table 8. Package import import android.os.Bundle import import import import public class MainActivity extends Activity Īn Android application (app) is a single installable unit which can be started and used independently.Īn Android application consists of configuration files, Java source and resource files. You access them via an InputStream object.ĭefines the actions which can be used in the toolbar of the application. XML files with layout descriptions are used to define the user interface for activities and fragments.įiles which define the appearance of your Android application.ĭefines animations in XML for the animation API which allows to animate arbitrary properties of objects over time.Īrbitrary files saved in their raw form. In a separate file, e.g., strings are defined in Used to define strings, colors, dimensions, styles andĪrrays of strings or integers via XML files. Images (e.g., png or jpeg files)or vector drawables or XML files which scale automatically with the density of the Android device The following table gives an overview of the supported resources and their standard folder prefixes. ![]()
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