Android Constraintlayout Performance Improvements - Missing In Action

I have created a custom view and inserted logging for an estimated performance comparison public class CustomInAppKeyboard extends LinearLayoutCompat { private static final S

Solution 1:

In order to answer this question, we'll have to take a detour for that.

I am assuming that you have read about how ConstraintLayout works internally, so let me just stick to the point. Yes, I agree that ConstraintLayout is slower than LinearLayout but it's only when the number of child views are less in number.

When you start building larger layouts, say which consist of 20-30 Views, the ConstraintLayout comes handy. If you'll then use LinearLayout or any other layout, say RelativeLayout then you'll end up using multiple child ViewGroups and your Layout Graph might end up like this

LinearLayout(orientation vertical)
   ->SomeChildView (let's say a TextView)
   ->LinearLayout (orientation horizontal)
            -> ChilView 1-> ChildView 2-> ImageView
   -> ButtonView
   ->ViewGroup (FrameLayout)
           -> ImageView1
           -> idk, maybe TextView?

and the list goes on.

Now, with such kind of Layout, traditional ViewGroups will end up computing more number of views than ConstraintLayout

So, we can come up with a conclusion that, no ViewGroup is perfect!! We just have to use them in accordance to our need..

Bonus!!ConstraintLayout should be avoided inside RecyclerView because it calls onMeasure() multiple times than any other layout.

I once made some research on ConstraintLayout back then before applying it to my project.