Join Stack Overflow to learn, share knowledge, and build your career. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I want to change my constraintlayout to a LinearLayout. I tried it with the green second area and it worked perfectly. Unfortunately, the top part doesn't work as well as the bottom part.
The problem is that the red area always occupies the entire area and does not go to the toolbar. I don't want to change something "more" in my Toolbar XML, otherwise the layout on all other pages is wrong.
I would like it to end up looking like the second picture. The red area should be at a distance from the toolbar and be at a maximum. So no matter how much content is in the red area, it should always be as large as possible by far. How can I do that? I'm really looking forward to helpful answers! Thanks in advance.
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Building momentum in our transition to a product led SaaS company. Featured on Meta.Almost every Android application requires a user interface which it holds UI elements. A ViewGroup is a special view that holds other views. Sub-classes or children of a ViewGroup are called layouts. First, launch Android Studio and create an Empty Activity project.
Before we move on, ensure that you have the latest stable version of constraint layout dependency in your app-level build. Add the following if it is missing. Views and widgets are added inside the layout tag which then becomes the parent to the respective element. Views and widgets are those components that the app users see on the screen. We can drag and drop the desired element from the palette onto the design preview. Alternatively, we can add the respective element in the XML code.
Getting Started with Constraint Layout in Android
Unconstrained views float to the top of the screen hence it is important to give at least two constraints, a vertical and a horizontal one. Meanwhile, a newly added view in this case a Button looks like this.Ahkam ul quran thanvi
To constrain a view, hold and drag the handle to the desired point. Alternatively, we can constrain it by writing the respective XML code. In most cases, we might want to use more than one view in our layout. For better responsiveness and overall effectiveness, views are constrained with respect to each other, preferably the closest one. This helps us avoid writing boilerplate code trying to attach every view to the parent.
The code snippet below shows how a view can be constrained vertically relative to another view. Note that each view requires a unique id that identifies it from the others. It is the closest a view can get to that point. In cases where we have views whose dimensions are the same, we can simplify their alignment by defining the dimension for one view then constraint the others to it so that they reflect the dimension.
This is called constraint set alignment. Referencing views need to set their width to 0dp. Also, this makes the width variable and responsive.
How does Constraint Layout works in android?
Similar to the width, we can make a view occupy a height equal to the vertical alignment points. A baseline is a horizontal invisible line that is centered in a view. A view can only have one baseline used to align it horizontally.
To add a baseline, right-click on the view that you want to align the baseline to that of another view.Connectionrefusederror errno 111 connect call failed
Select show baseline. Constraint layout has the capability of aligning views with respect to the center of another view at a given angle and radius.
Its center serves as the center for the alignment. This determines how far a referencing view is placed from the referenced one. Chains are one of the coolest features of the constraint layout.ConstraintLayout allows you to create large and complex layouts with a flat view hierarchy no nested view groups.
It's similar to RelativeLayout in that all views are laid out according to relationships between sibling views and the parent layout, but it's more flexible than RelativeLayout and easier to use with Android Studio's Layout Editor. All the power of ConstraintLayout is available directly from the Layout Editor's visual tools, because the layout API and the Layout Editor were specially built for each other.
So you can build your layout with ConstraintLayout entirely by drag-and-dropping instead of editing the XML. This page provides a guide to building a layout with ConstraintLayout in Android Studio 3. To define a view's position in ConstraintLayoutyou must add at least one horizontal and one vertical constraint for the view. Each constraint represents a connection or alignment to another view, the parent layout, or an invisible guideline. Each constraint defines the view's position along either the vertical or horizontal axis; so each view must have a minimum of one constraint for each axis, but often more are necessary.
When you drop a view into the Layout Editor, it stays where you leave it even if it has no constraints. However, this is only to make editing easier; if a view has no constraints when you run your layout on a device, it is drawn at position [0,0] the top-left corner. In figure 1, the layout looks good in the editor, but there's no vertical constraint on view C. When this layout draws on a device, view C horizontally aligns with the left and right edges of view A, but appears at the top of the screen because it has no vertical constraint.
Figure 1. The editor shows view C below A, but it has no vertical constraint. Although a missing constraint won't cause a compilation error, the Layout Editor indicates missing constraints as an error in the toolbar. To view the errors and other warnings, click Show Warnings and Errors. To help you avoid missing constraints, the Layout Editor can automatically add constraints for you with the Autoconnect and infer constraints features.
To use ConstraintLayout in your project, proceed as follows:. Now you're ready to build your layout with ConstraintLayout. Figure 3. The menu to convert a layout to ConstraintLayout. Video 1. The left side of a view is constrained to the left side of the parent. When you add a view in a ConstraintLayoutit displays a bounding box with square resizing handles on each corner and circular constraint handles on each side.
Click one of the Create a connection buttons in the Layout section of the Attributes window, as shown in figure 4. Figure 4. The Layout section of the Attributes window lets you create connections. When the constraint is created, the editor gives it a default margin to separate the two views.
Press and hold Control Command on macOSand then click on a constraint anchor. Note that the constraint turns red to indicate that you can click to delete it, as shown in figure 5.
Figure 5. A red constraint indicates that you can click to delete it. In the Layout section of the Attributes window, click on a constraint anchor, as shown in figure 6.
Video 2. Adding a constraint that opposes an existing one. If you add opposing constraints on a view, the constraint lines become squiggly like a spring to indicate the opposing forces, as shown in video 2.
The effect is most visible when the view size is set to "fixed" or "wrap content," in which case the view is centered between the constraints. If you instead want the view to stretch its size to meet the constraints, switch the size to "match constraints" ; or if you want to keep the current size but move the view so that it is not centered, adjust the constraint bias.
You can use constraints to achieve different types of layout behavior, as described in the following sections.Join Stack Overflow to learn, share knowledge, and build your career.
Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. They are currently the same size, but I would like them to have different weights with a ratio.
Create your views and add them to the parent ConstraintLayout. You will need to give them each an id in order for everything to work; you can use View. Learn more. How to add different weight to ConstraintLayout views Ask Question. Asked 2 years, 11 months ago. Active 9 months ago. Viewed 32k times. How can this be achieved in my ConstraintLayout? ChrisMcJava 1, 2 2 gold badges 22 22 silver badges 33 33 bronze badges.
Prashant Jajal Prashant Jajal 2, 2 2 gold badges 18 18 silver badges 32 32 bronze badges. Active Oldest Votes. Ben P. Hi, is it doable programmatically? Dec 10 '18 at Any reason why the constraint between the two elements basically needs to be defined twice? I mean : A is left of B, is same as B is right of A? RowanGontier because chains are only formed when there is a bi-directional dependency between the views. If A is left of B, then A depends on B.You may see differences if you are using a different version.
Those who are familiar with graphic design tools will be familiar with the concept of guidelines already because they are commonly used. But for those that are not, a guideline is a visual guide which will not be seen at runtime that is used align other views to. This is a bit of an abstract concept, but they are really quite useful once you understand how they work. Guidelines can be oriented either horizontally or vertically. To create a vertical guideline you do so by right clicking on the blueprint view and selecting Add Vertical Guideline from the context menu:.
In old versions of Android Studio you would not see the newly created guideline until you clicked on the blueprint view. There are three distinct types of guideline. By default a guideline will have a fixed offset from the start edge of the parent ConstraintLayout specified in dp.
The guideline that we just created is offset from the start edge by 16dp. The second type of guideline is offset from the end edge; and the final type of guideline is positioned at a fraction of the width of the parent ConstraintLayout. There is an indicator at the edge of the guideline which shows the type, and we can cycle between the types by repeatedly clicking on this:. The left and right offset types are useful if we want to set up keylines, whereas the fractional type provides some of the functionality provided by PercentLayout.
Once we have a guideline set up we can adjust its position by simply dragging the line as opposed to the type indicator :.
You can see that happening in the example. Now that we know how to create the different types of guideline, and adjust their positions, what can we actually do with them? We can use them as any other view as a constraint target - in other words we can create a constraint from an anchor point of any view in the layout and align it to the guideline.
If we then move the guideline, the view will move with it:. This is actually pretty powerful. The example only shows a single view constrained to the guideline, but if we were to have more views constrained to it, moving the guideline would cause all of them to move. The Guideline class is actually a subclass of View. It will never draw anything because it has a final onDraw which is empty and has a fixed visibility of View.Zoom invitation password
Nothing will ever display at runtime, but during the layout phase it will have a position to which we can align its siblings.Making predictions may be difficult, especially about the futureas US Baseball Hall of Famer Yogi Berra famously observed. But they can still provide valuable foresight for executives. Create a profile to get full access to our articles and reports, including those by McKinsey Quarterly and the McKinsey Global Institute, and to subscribe to our newsletters and email alerts.
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