android:layout_gravity="center" can't set the button in the center of titlebar?

Question

I am really a new fresher in android, I know android:layout_gravity sets the gravity of the View or Layout in its parent.And android:gravity sets the gravity of the content of the View its used on.Refer

But when I set the titlebar Linearlayout gravity="center",the button did sit in the center

But when I delete gravity="center" in the head of LinerLayout,then add layout_gravity="center" in the button,the button sit in the left?

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    >

    <Button
        android:id="@+id/back"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Back"
        android:layout_gravity="center"
        android:textColor="#fff" />

</LinearLayout>

Change LinearLayout Height to `android:layout_height="match_parent"`. — Dhaval Patel, Dec 11 '15 at 05:32
Thanks,hetal. That's true as I describe in the question. What I asking is why I can't use `layout_gravity="center"` to set the button in the center — Gaby, Dec 11 '15 at 05:38
if you want to use layout_gravity="center" then width of you button should be match_parent — H Raval, Dec 11 '15 at 05:46

score 3 · Accepted Answer · answered Dec 11 '15 at 05:36

just give orientation to your LinearLayout, rest all things are perfect

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <Button
    android:id="@+id/back"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Back"
    android:layout_gravity="center"
    android:textColor="#fff" />

</LinearLayout>

Yeah! Is that means `layout_gravity` must work with `LinearLayout orientation` ? If I add two other widget `TextView` and `Button`, — Gaby, Dec 11 '15 at 05:48

score 2 · Answer 2 · edited Dec 11 '15 at 06:43

2

check the following code and button at center:

 <LinearLayout
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:orientation="vertical">
          <Button
              android:layout_width="100dp"
              android:layout_height="100dp"
              android:layout_gravity="center"/>
     </LinearLayout>

edited Dec 11 '15 at 06:43

Abhinav Singh Maurya

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answered Dec 11 '15 at 06:32

Prathap Badavath

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score 0 · Answer 3 · answered Dec 11 '15 at 05:34

   <?xml version="1.0" encoding="utf-8"?>
   <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:gravity="center"
    android:layout_height="wrap_content"
   >

<Button
    android:id="@+id/back"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Back"
    android:textColor="#fff" />

score 0 · Answer 4 · edited Feb 19 '18 at 22:05

0

add android:orientation="vertical" in the LinearLayout

edited Feb 19 '18 at 22:05

Rosário Pereira Fernandes

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answered Feb 19 '18 at 21:38

Halgo

13
5

android:layout_gravity="center" can't set the button in the center of titlebar?

4 Answers4