LinearLayout android:layout_gravity="center_vertical" works at design time but doesn't at run time

Question

    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center_vertical"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <ImageView
        android:id="@+id/dice_image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        app:srcCompat="@drawable/empty_dice"
        tools:src="@drawable/dice_1" />

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

</LinearLayout>

on design time i got the linearlayout centered verticaly , but when i test it on emulator or my device the linear layout is displayed at the top of the screen

Why don't you go with RelativeLayout and use `centerInParent = true` — Ezio, Mar 31 '20 at 05:51

score 3 · Accepted Answer · answered Mar 31 '20 at 05:52

3

In your LinearLayout, change layout_gravity to just gravity

answered Mar 31 '20 at 05:52

Mike

1,313
12
21

thanks Mike , but why there is no sync between the design and run time ? – Sh.Raai Mar 31 '20 at 05:57

score 2 · Answer 2 · answered Mar 31 '20 at 05:53

2

Don't

 android:layout_gravity="center_vertical"

You should use android:gravity="center_vertical"

Place object in the vertical center of its container, not changing its size

answered Mar 31 '20 at 05:53

IntelliJ Amiya

74,896
15
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1

android:gravity sets the gravity of the contents (i.e. its subviews) of the View it's used on. android:layout_gravity sets the gravity of the View or Layout relative to its parent. so that is not true ???!!! – Sh.Raai Mar 31 '20 at 06:00
1

@Sh.Raai exactly. – IntelliJ Amiya Mar 31 '20 at 06:02
@Sh.Raai read https://stackoverflow.com/questions/3482742/what-is-the-difference-between-gravity-and-layout-gravity-in-android – IntelliJ Amiya Mar 31 '20 at 06:12

score 0 · Answer 3 · edited Mar 31 '20 at 07:58

0

In the layout:

change android:layout_height="wrap_content"

to

android:layout_height="match_parent"

edited Mar 31 '20 at 07:58

Nikos Hidalgo

3,666
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answered Mar 31 '20 at 07:52

Ki11qwerty

1

LinearLayout android:layout_gravity="center_vertical" works at design time but doesn't at run time

3 Answers3