layout_gravity of button in LinearLayout not working correctly

Question

My requirement is to achieve this in LinearLayout. It is having only one child view. In horizontal orientation, a button needs to be at center horizontal, if layout_gravity is set. my layout xml is

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="200dp"
android:background="#ffff00"
android:layout_width="match_parent"
android:orientation="horizontal">

<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_horizontal"
    android:text="Button" />

</LinearLayout>

But the result is like below image

enter image description here

What i am expecting is, when the layout_gravity is set to center_horizontal , the button center to the horizontal. Why this is not working

android:layout_gravity="center" use only center and orientation to vertical — Brendon, Jul 15 '14 at 07:37
@Brendon can you post link to the documentation describing this behaviour ? — Blackbelt, Jul 15 '14 at 07:41

score 1 · Answer 1 · answered Jul 15 '14 at 07:48

The problem with yours is not with your actual element but with your parent element. When you define the same property to the parent element, your issue will be resolved.

add the following attribute to the LinearLayout

android:gravity="center_horizontal"

score 1 · Answer 2 · answered Jul 15 '14 at 08:39

1

You can achieve it in two Method,

Set android:gravity="center_horizontal" in layout properties

or

Set android:layout_gravity="center" in Button properties

Your Layout to be in "Vertical" Orientation

answered Jul 15 '14 at 08:39

Brendon

1,368
1
12
28

score 1 · Answer 3 · answered Aug 19 '17 at 03:09

We need to figure out the question is:

The widget can only use vertical attribute (like top, center_vertical, bottom) when it's root layout useorientation: horizontal
The widget can only use horizontal attribute (like left, center_horizontal, right) when it's root layout use orientation: vertical

So that you need to do like this(tested & works):

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_height="200dp"
    android:background="#ffff00"
    android:layout_width="match_parent"
    android:orientation="vertical">

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="Button" />

</LinearLayout>

Test Image

score 0 · Answer 4 · answered Jul 15 '14 at 07:43

Set center horizontal gravity to the parent:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_height="200dp"
    android:background="#ffff00"
    android:layout_width="match_parent"
    android:orientation="horizontal"
    android:gravity="center_horizontal">

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />

</LinearLayout>

or just change parent orientation to horizontal

any other way to achieve this in child level. – Arundas K V Jul 15 '14 at 08:19 — Arundas K V, Jul 15 '14 at 08:19

score 0 · Answer 5 · answered Jul 15 '14 at 07:48

0

Actually you cant. Your root layout is horizontal orientationL android:orientation="horizontal". If you want it work, just change root's orientation to vertical (I dont test yet!)

answered Jul 15 '14 at 07:48

Kingfisher Phuoc

8,052
9
46
86

layout_gravity of button in LinearLayout not working correctly

5 Answers5