make RecyclerView's height to “wrap_content” in Constraint layout

Question

i\'m trying to set the height of recycler view on wrap_content and make it respect that,but it will exceed the other widget on layout. what can i do now?

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Answer 1

I had this issue. I needed to build a UI page that contained a RecyclerView with an unknown number of elements that should scroll. The page had the the following layout:

LinearLayout
    ConstraintLayout
        TextView
        RecyclerView
        TextView

and I wanted heights to be determined procedurally for everything using match_parent and wrap_content.

I wanted the RecyclerView to use all the space available between the two TextViews.

The key was to give the RecyclerView an "impossible" constraint, by doing this:

app:layout_constraintTop_toBottomOf="@+id/topTextView"
app:layout_constraintBottom_toTopOf="@+id/bottomTextView"

and adding this:

app:layout_constrainedHeight="true"

If you need to add margin between the top TextView and RecyclerView (and/or the bottom TextView and RecyclerView) put the margin on the RecyclerView, not the TextViews.

Code Examples

Below is the actual code I'm using (with some text styling removed for readability)

As a final note, the HolderView also uses only wrap_content. Here's that code as well: