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A constraint is a connection or alignment between two UI elements. Each constraint connects or aligns one view to another view, to the parent layout, or to an invisible guideline. In a ConstraintLayout, you position a view by defining at least one horizontal and one vertical constraint. Horizontal constraint: B is constrained to stay to the right of A. In a finished app, B would need at least one vertical constraint in addition to this horizontal constraint. Vertical constraint: C is constrained to stay below A.
In a finished app, C would need at least one horizontal constraint in addition to this vertical constraint. The Empty Activity template creates a single empty activity in the Mainactivity. The layout uses ConstraintLayout as its root view group, with a single TextView as the layout's content. When you set the default margin to 16dp , new constraints are created with this margin, so you don't have to add the margin each time you add a constraint.
The view inspector, shown in the screenshot below, is a part of the Attributes pane. The view inspector includes controls for layout attributes such as constraints, constraint types, constraint bias, and view margins. Constraint bias positions the view element along the horizontal and vertical axes.
To adjust the bias, you can drag the bias sliders in the view inspector. Dragging a bias slider changes the view's position along the axis. In the view inspector, the arrows inside the square represents the type of the constraint:. In this style, the background color and the text color are set to default Android color resources. The font is set to Roboto.
Notice that when you hold the pointer over the constraint handle, the handle turns green and blinks. Create a constraint that connects the top of the new text view to the bottom of the Box One text view:. As you release the click, the constraint is created, and the new text view jumps to within 16dp of the bottom of the Box One.
The new text view has a top margin of 16dp because that's the default you set earlier. In this case, you're assigning fixed sizes for the height and width of the text view. Assign fixed sizes for height and width only if your view should always have a fixed size on all devices and layouts.
In this task, you add three TextView views. The text views are vertically aligned with each other, and horizontally aligned with the Box Two text view. The views will be in a chain. A chain is a group of views that are linked to each other with bidirectional constraints. The views within a chain can be distributed either vertically or horizontally.
For example, the following diagram shows two views that are constrained to each other, which creates a horizontal chain. The first view in a chain is called the head of the chain. The attributes that are set on the head of the chain control, position, and distribute all the views in the chain. For horizontal chains, the head is the left-most view.
For vertical chains, the head is the top-most view. In each of the two diagrams below, "A" is the head of the chain. Chain styles define the way the chained views are spread out and aligned. You style a chain by assigning a chain style attribute, adding weight, or setting bias on the views.
Packed chain. Packed chain with bias. You can add chain styles in the Layout Editor, which you learn in this task. In the Component Tree, you see errors about missing constraints.
You fix these errors later. This creates a vertical chain that extends from Box One to the end of the layout. Observe that the three text views are now constrained to the top and bottom of Box Two. In this task, you make the ColorMyViews app a little more colorful. First you change the color of all the text views to white.
Then you add a click handler that changes the view's color and the layout background color when the user taps it. Every view has a resource ID. To set a color, the code will switch using a when statement on the view's resource ID. It's a common pattern to use one click-handler function for many views when the click action is the same. If the id doesn't match any of the views, you know that the user has tapped the background. At the end of the when statement, add an else statement.
Inside the else , set the background color to light gray. For this code to run, it needs the android. TextView library. If Android Studio doesn't import this library automatically, use an import statement to add the library before the MainActivity class definition.
Use images instead of colors and text as backgrounds for all the views. The app should reveal the images when the user taps the text views.
Hint: Add images to the app as drawable resources. Use the setBackgroundResource function to set an image as a view's background. The baseline constraint aligns the baseline of a view's text with the baseline of another view's text. Aligning views that contain text can be a challenge, especially if the fonts are differently sized.
Baseline constraint does the alignment work for you. In this task, you add instructions that tell the user how to use the app. You create two TextView views, one for a label and one for the instructions information. The text views have different font sizes, and you align their baselines. Design-time attributes are used and applied only during the layout design, not at runtime. When you run the app, the design-time attributes are ignored. This line of code is added because you haven't yet added a vertical constraint.
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