When aligned to width LinearLayout layout_weight = “1” requires unit

Question

I use android: layout_weight = "1" to align the elements, but I can't figure out why I need to specify the unit of measurement.

What is the reason for this?

<LinearLayout
        android:orientation="horizontal"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="5dp"
        android:layout_marginRight="5dp">
        <Button
            android:text="+"
            android:layout_width="odp"
            android:layout_height="65dp"
            android:layout_weight="1"// requires a unit
            android:background="@android:color/black"
            android:textColor="@android:color/white"
            android:id="@+id/bttnPlus"
            android:layout_marginRight="20.0dp" />
        <Button
            android:text="-"
            android:layout_width="odp"
            android:layout_height="65dp"
            android:layout_weight="1"// requires a unit
            android:background="@android:color/black"
            android:textColor="@android:color/white"
            android:layout_marginRight="20.0dp"
            android:id="@+id/bttnMinuse" />
    </LinearLayout>

I can confirm that it will work well with just 1. And this is a good question as I found it strange too, just I have never asked. — Ivan Ičin, Dec 07 '20 at 20:33

score 1 · Accepted Answer · answered Dec 08 '20 at 03:04

1

It does not need a unit and it's an issue of Visua-Studio.

In this thread:

It should be fixed in the Visual-Studio v16.9 Preview.

answered Dec 08 '20 at 03:04

nevermore

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score 0 · Answer 2 · answered Dec 07 '20 at 21:27

0

I think the problem isn't the layout_weight. your layout_width has typos

android:layout_width="0dp"

instead of

android:layout_width="odp"

answered Dec 07 '20 at 21:27

Sven-Michael Stübe

14,560
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I changed `android:layout_width="odp"` to this `android:layout_width="0dp"` and the error remained – bahmN Dec 08 '20 at 08:43
Yes, the problem is not about typo. – nevermore Dec 08 '20 at 09:38

When aligned to width LinearLayout layout_weight = “1” requires unit

2 Answers2