![]() ![]() Suppose that there were no Button widget in the basic widget set in the Android SDK and you want to make one. But if you want UI customization or a different user interaction, you may need to extend a widget. Sometimes you want to show a certain type of data and there is already a suitable view in the basic widget set. ViewGroup is the base class for Android layouts, which are containers for a set of Views (or other ViewGroups), and define their own layout properties and also where each subview should draw itself. ViewGroup is a subclass of the View class. Also, a View is responsible for user event handling. A View occupies a rectangular area on the screen to draw itself and its children (for the case of a ViewGroup). The Android View class is the basic building block of an Android user interface. You will see the text "Hello Custom Views" on your screen, like this: Reset onCreate() in MainActivity to use setContentView(R.layout.activity_main), and remove the code you added earlier. To change an attribute, like the text of a TextView, just add the attribute name ( android:text) and assign a value to it ( "Hello Custom Views"), as in the last line of the previous snippet. You can change a lot of basic attributes from the View class in XML, such as id, layout_width, layout_height, alpha, visibility, elevation, padding, tag, etc. To use one of the basic Android widgets like TextView, just drag it from the palette window on the left into the design editor and drop it to the top center of the layout, or switch to the XML text editor and add the following lines to the XML code inside the RelativeLayout: Now open up res/layout/activity_main.xml. You will see the text “Hello Custom Views” on your screen like this: Set the TextView as the content view of the activity.īuild and run.Set “Hello Custom Views” as the text of the TextView.Create a TextView by using the constructor which needs the activity context.Open MainActivity and replace the setContentView(R.layout.activity_main) line in onCreate() with the following code: You can add a TextView to your layout from the Kotlin code. You have two ways to create a new instance of an Android view and to set values for its attributes: The following image shows a part of the basic widget hierarchy: It is (mostly) an empty project with some resources (colors, dimens and icon launcher).īuild and run the app, and you will see an empty screen like this:Īndroid has a set of basic widgets and the base class of any Android widget is the View class. To kick things off, start by downloading the materials for this tutorial (you can find a link at the top or bottom of the page) and then fire up Android Studio and import the starter project. To follow along with this tutorial, you’ll need to use Android Studio 3.0.1 or later and Kotlin 1.2.21 or later. If you’re completely new to Android, you might want to first check out Beginning Android Development Part One. Import 7.app.Prerequisites: This Android tutorial is all about custom views, so you need basic knowledge of Android programming and familiarity with Kotlin, Android Studio, and XML layouts. You may also visit post to use Textview widget in xml file in android ![]() Open src/main/java//MainActivity.java file. 4.Create Android TextView Programmatically / Dynamically In Java file, we will create TextView dynamically and add it into this LinearLayout having id rootLayout. Note that LinearLayout has id rootLayout. Other values folders have not been changed. Open res/values/strings.xml file and add below code into it. Now, we will modify the xml and java files to create TextView programmatically and add it in xml file. However, you can also visit post to create a new project to know steps in detail. If you have followed above process correctly, you will get a newly created project successfully. Then, select Empty Activity => click next => click finish. However, we have selected 17 as minimum SDK. Write application name as DynamicTextView. Please ignore the steps if you have already created project. Follow the steps below to create new project. Tutorialwing Dynamic TextView Tutorial Output Video Outputįirst step is to create New Project.
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