Develop Reference

Fragment Transactions with scrollview

You have an Activity A --> display a fragment B (scrollView), on next button you have fragment C replaced with relative Layout. But the view is not replaced.

ScrollView Defines as follows :
"A view group that allows the view hierarchy placed within it to be scrolled. Scroll view may have only one direct child placed within it. To add multiple views within the scroll view, make the direct child you add a view group, for example LinearLayout, and place additional views within that LinearLayout."
-ScrollView is not a base view hence wrapping the scrolling in base views like (Linear Layout,RelativeLayout Can solve your problem

Multiple children in scrollview

Is there a way to have more than one child in scrollview using a constraint layout? I'm new to coding so any help would be appreciated. I am using the latest version of android studio.

It's impossible to add more than one child into ScrollView / HorizontalScrollView / NestedScrollView
Google doc says next:
A view group that allows the view hierarchy placed within it to be scrolled. Scroll view may have only one direct child placed within it. To add multiple views within the scroll view, make the direct child you add a view group, for example LinearLayout, and place additional views within that LinearLayout.
android developers

Just wrap the children into a FrameLayout or so.
-> ScrollView
\-> FrameLayout
\-> Child 1
\-> Child 2
\-> Child 3
If you want them to be one below each other use a LinearLayout and set android:orientation="vertical".

Is parent view and container view the same thing?

I'm confused about the definition. In Android, is a view's parent and container the same thing? For instance, when a recyclerview layout contains a itemview, is the recyclerview both the itemview's parent view and container view?

view's parent and container the same thing?
Yes. Since only containers can contain other views (incl. other containers too), then only said container can be parent to views it contains.
recyclerview layout contains a itemview, is the recyclerview both the itemview's parent view and container view
recyclerview is not the best example, but for simplicity 'yes'. This may give you some overview too:
containerA
view1
containerB
view2
view3
where containerA/B are ViewGroups (i.e. LinearLayouts) and view1/2/3 are i.e. widgets (say Buttons).

What does child mean in an android layout?

I am new to Android Development, so what is meant by child in the below paragraph....
A ScrollView is a FrameLayout, meaning you should place one child in
it containing the entire contents to scroll; this child may itself be
a layout manager with a complex hierarchy of objects. A child that is
often used is a LinearLayout in a vertical orientation, presenting a
vertical array of top-level items that the user can scroll through.
https://developer.android.com/reference/android/widget/ScrollView.html

In android (and most other technologies), views can have subviews, aka "children". Most views can have children and can be a child of a parent view. It's kind of like a "tree".
The most obvious feature of being a child of some other view is that the child moves with the parent view. Another feature is that the child is in the coordinate space of the parent view.
Your paragraph here basically says you can only put one child view in ScrollView and it is usually a LinearLayout. But don't be fooled! This child can have its own child views.

Gaurav i think this is what you looking for, you need to use only one LinearLayout tag inside ScrollView tag, if you are using more than one LinearLayout than it will show error. If you want to use more LinearLayout tag you can use them inside LinearLayout tag which is inside ScrollView tag. May be this will help you.

You need to understand the general concept of child and parent . Simply you can think of the real life relation between parent and child.on the hierarchy parents are toplevel and child is below.so when you come to android layout parent is container and child is the content.

How to arrange a custom view with some basic views like buttons and textviews in a custom layout

I had prepared a custom view now i want to place that view with some other basic views through a custom layout. I dont know much about custom layouts. How can I arrange these views programatically in custom layout and then how can I inflate that layout.
Thanks in advance