23.5 Configuring the Constraint Set

In the absence of any constraints, the ConstraintLayout view has placed the Button view in the top left corner of the display. In order to instruct the layout view to place the button in a different location, in this case centered both horizontally and vertically, it will be necessary to create a ConstraintSet instance, initialize it with the appropriate settings and apply it to the parent layout.

For this example, the button needs to be configured so that the width and height are constrained to the size of the text it is displaying and the view centered within the parent layout. Edit the onCreate() method once more to make these changes:

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import androidx.constraintlayout.widget.ConstraintSet;

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private void configureLayout() {

    Button myButton = new Button(this);

    myButton.setText(getString(R.string.press_me));

    myButton.setBackgroundColor(Color...