Nested layout_rowWeight

Question

I have a GridLayout that contains android:layout_height="0dp" and android:layout_rowWeight="1". This works great, except for when I use a row weight inside of it. The GridLayout contains a RecyclerView that also uses android:layout_height="0dp" and android:layout_rowWeight="1". From what I can tell, this causes the RecyclerView to be the same height as it's parent (in other words, it is calculating the height based on the parent of it's parent, rather than it's direct parent). This is causing not all elements to fit. If I set the layout_height of either the immediate parent GridLayout or the parent's parent to a fixed value, everything works fine (except for the fact that I would need to manually calculate that value). Is there a way to use nested row weights, or do I need to manual calculate the heights?

Answer 1

Hi, njsokalski. I created a basic demo to test the function, the recyclerView is displayed as expected. In the child GridLayout, I placed a textView and the recyclerView.

Here is the sample code, you could refer to it.

<?xml version="1.0" encoding="utf-8"?>
<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:columnCount="1"
    android:rowCount="3"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:text="the first row"
        android:layout_row="0"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

    <GridLayout
        android:background="#ff0"
        android:layout_row="1"
        android:columnCount="1"
        android:layout_rowWeight="1"
        android:rowCount="2"
        android:layout_width="match_parent"
        android:layout_height="0dp">
        <TextView
            android:text="testing"
            android:layout_row="0"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
        <androidx.recyclerview.widget.RecyclerView
            android:background="#ff00"
            android:id="@+id/recyclerView1"
            android:layout_row="1"
            android:layout_rowWeight="1"
            android:layout_width="match_parent"
            android:layout_height="0dp"/>
    </GridLayout>

    <TextView
        android:text="the last row"
        android:layout_row="2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
</GridLayout>

If the code doesn't work for your project or there are some differences with your project, please post the related code.