why is there a gray marker find my device android

Note: Like in a family tree, in a view hierarchy, parent views can themselves be child views, and child views can be parents to other children. In the case of your app, the TextView and Button would be considered children of the parent ConstraintLayout.Īdd a Button as a child of the existing ConstraintLayout in your app.

When there are Views within a ViewGroup, the Views are considered children of the parent ViewGroup. The TextView and the Button will be located within a ConstraintLayout, which is a type of ViewGroup. In this task, you add a Button below the 'Hello World' TextView. A Button is a user interface (UI) element in Android that the user can tap to perform an action. You should see the Layout Editor, with only the 'Hello World' TextView in the center of the app.

In the Project window, double-click activity_main.xml ( app > res > layout > activity_main.xml) to open it.

Run the new app and it should look like this.

Call the app 'Dice Roller', with a minimum API level of 19 (KitKat).

In Create New Project, create a new Kotlin project using the Empty Activity template.

If you already have an existing project open in Android Studio, go to File > New > New Project.

Here is what the app will look like when you have completed this codelab.

A computer with Android Studio installed.

A Dice Roller Android app that has a Button to roll a dice and updates the text on the screen with the result of the roll.

How to update the contents of a TextView while the app is running.

How to open and modify the Activity code of an app.

How to add behavior for when a Button is tapped in the app.

How to extract text into a string resource to make it easier to translate your app and reuse strings.

How to modify the attributes of a TextView in the Layout Editor.

Familiar with using TextViews in an app.

How to create and run a 'Hello, World!' app in Android Studio.

You will use the Layout Editor in Android Studio to build your app layout, and then write Kotlin code for what happens when the Button is clicked. The outcome of the roll will be shown in a TextView on the screen. In this codelab, you will create a Dice Roller Android app where users can click a Button in the app to roll a dice.

Why is there a gray marker find my device android