As provided by Xaver Kapeller – “The main purpose of the ConstraintLayout is to fix problems with the RelativeLayout, and it does it so well. You can do so many things that were impossible with a RelativeLayout. And you can simplify your layout like you never could before. Additionally, it fixes a long-standing performance issue … Read more
I have made a small example of a recursive function: public void recursiveLoopChildren(ViewGroup parent) { for (int i = 0; i < parent.getChildCount(); i++) { final View child = parent.getChildAt(i); if (child instanceof ViewGroup) { recursiveLoopChildren((ViewGroup) child); // DO SOMETHING WITH VIEWGROUP, AFTER CHILDREN HAS BEEN LOOPED } else { if (child != null) { … Read more
Short answer The best move will be replacing <merge> block with a (nested) ConstraintLayout rather than using redundant layout structure. ConstraintLayout is great but it doesn’t work well with composition and separation of responsibilities of each piece That is wrong. ConstraintLayout does work well with reusing layouts. Any layout in which all child views are … Read more
Depending on which ViewGroup you are after, you can get the parent of your view and cast it to a ViewGroup: (ViewGroup)view.getParent() // this can be done to get any level in your view hierarchy or you can cast the view itself as a ViewGroup: (ViewGroup)view Basically, find the view you want in your view … Read more
I implemented FixedAspectRatioFrameLayout, so I can reuse it and have any hosted view be with fixed aspect ratio: public class FixedAspectRatioFrameLayout extends FrameLayout { private int mAspectRatioWidth; private int mAspectRatioHeight; public FixedAspectRatioFrameLayout(Context context) { super(context); } public FixedAspectRatioFrameLayout(Context context, AttributeSet attrs) { super(context, attrs); init(context, attrs); } public FixedAspectRatioFrameLayout(Context context, AttributeSet attrs, int defStyle) { … Read more
By default, onDraw() isn’t called for ViewGroup objects. Instead, you can override dispatchDraw(). Alternatively, you can enable ViewGroup drawing by calling setWillNotDraw(false) in your TableView constructor. EDIT: For #2: – Initialize it in the constructor, then just call rect.set() in your onLayout() method. For #3: – Yes, as far as I’m aware the super call … Read more
While Bruce’s answer does solve the problem, it does it in a very brutal way which harms the UX, as it will clear the focus of every view once we did a scroll. It deals with the symptom of the problem but it does not solve the actual cause. how to reproduce the problem: Your … Read more
Possible Solution I had this same issue. I setup an animation and in onAnimationEnd I was removing the object that had been animated which is when problems started. What I did was setup an asynchronous Runnable to wait 100 milliseconds after the animation had stopped before removing the animated object: the object previously animated is … Read more
View View objects are the basic building blocks of User Interface(UI) elements in Android. View is a simple rectangle box which responds to the user’s actions. Examples are EditText, Button, CheckBox etc.. View refers to the android.view.View class, which is the base class of all UI classes. ViewGroup ViewGroup is the invisible container. It holds … Read more