Adjust icon size of Floating action button (fab)

Question

The new floating action button should be 56dp x 56dp and the icon inside it should be 24dp x 24dp. So the space between icon and button should be 16dp.

<ImageButton
    android:id="@+id/fab_add"
    android:layout_width="56dp"
    android:layout_height="56dp"
    android:layout_gravity="bottom|right"
    android:layout_marginBottom="16dp"
    android:layout_marginRight="16dp"
    android:background="@drawable/ripple_oval"
    android:elevation="8dp"
    android:src="@drawable/ic_add_black_48dp" />

ripple_oval.xml

<ripple xmlns:android="http://schemas.android.com/apk/res/android"
    android:color="?android:colorControlHighlight">
    <item>
        <shape android:shape="oval">
            <solid android:color="?android:colorAccent" />
        </shape>
    </item>
</ripple>

And this is the result I get:

I used the icon from \material-design-icons-1.0.0\content\drawable-hdpi\ic_add_black_48dp.png
https://github.com/google/material-design-icons/releases/tag/1.0.1

How to make the size of the icon inside the button be exactly as described in guidelines ?

http://www.google.com/design/spec/components/buttons.html#buttons-floating-action-button

Capitalistic

Possible duplicate of : https://mcmap.net/q/120664/-android-floating-button-icon-is-not-centred – Chadburn

Answer 1

As your content is 24dp x 24dp you should use 24dp icon. And then set android:scaleType="center" in your ImageButton to avoid auto resize.

Tangerine

Can you explain or drop a link to some site, why for example in drawable-hdpi folder there are _18dp.png, _24dp.png, _36dp.png, _48dp.png images. – Capitalistic

I don't understand your question, there are 18dp, 24dp, 36dp and 48dp for different size images. – Worrell

Do you remember the old Android_Design_Icons which had only one variant of the icon in hdpi folder which was 48px x 48px. Why now in hdpi folder there are 4 different resolution for the same icon i.e. 27px x 27 px, 36px x 36px, 54px x 54px, 72px x 72px ? – Capitalistic

yep I remember but I can't explain why these new icons are in multiple sizes... (to get them super clean when they are used ?). Hope someone has an answer to that – Worrell

Is android:scaleType applicable to an ImageButton because I don't get any suggestions when I use CTRL+SPACE. Without that tag it gives the same effect. Maybe for ImageButton android:scaleType is set by default to center – Capitalistic

ImageButton is a subclass of ImageView so you have a scaleType attribut and default scaleType is ScaleType.FIT_CENTER – Worrell

Then I will not change it. I think the default value ScaleType.FIT_CENTER is safer to use for an ImageButton. – Capitalistic

android:scaleType="center" android:scaleType="centerCrop" are settings work on almost all views – Hyacinthie

No longer works with com.android.support:support-v4:28.0.0-rc01 – Busk

Answer 2

Try to use app:maxImageSize="56dp" instead of the above answers after you update your support library to v28.0.0

Is

Any ways, you don't get this in 28.0.0 version, you will get it in androidx. – Taddeusz

I haven't switched to AndroidX, this is what I am using: api 'com.android.support:design:28.0.0' – Is

This worked for me but I would like more information to understand why defining a maxIconSize changes the icon size. – Benempt

Can you please tell me how to set maxImageSize programmatically? I couldn't find the answer. – Remunerative

Answer 3

There are three key XML attributes for custom FABs:

• app:fabSize: Either "mini" (40dp), "normal"(56dp)(default) or "auto"
• app:fabCustomSize: This will decide the overall FAB size.
• app:maxImageSize: This will decide the icon size.

---

Example:

app:fabCustomSize="64dp" 
app:maxImageSize="32dp"

The FAB padding (the space between the icon and the background circle, aka ripple) is calculated implicitly by:

4-edge padding = (fabCustomSize - maxImageSize) / 2.0 = 16

---

Note that the margins of the fab can be set by the usual android:margin xml tag properties.

Geanticline

Can you please tell me how to set maxImageSize programmatically? I couldn't find the answer. – Remunerative

@Remunerative According to the API documentation, there are no public methods to set the FAB's "maxImageSize". However, there is a "setCustomSize" method... See if it works out for you. In the worst case, you need to create a new FAB view and append it into your layout... since there is no way to dynamically set attributes in XML without the view's setter method. – Geanticline

maxImageSize worked for me for showing full drawable in floating button. – Demetrademetre

Answer 4

Make this entry in dimens

<!--Floating action button-->
<dimen name="design_fab_image_size" tools:override="true">36dp</dimen>

Here 36dp is icon size on floating point button. This will set 36dp size for all icons for floating action button.

Updates As Per Comments

If you want to set icon size to particular Floating Action Button just go with Floating action button attributes like app:fabSize="normal" and android:scaleType="center".

  <!--app:fabSize decides size of floating action button You can use normal, auto or mini as per need-->
  app:fabSize="normal" 

  <!--android:scaleType decides how the icon drawable will be scaled on Floating action button. You can use center(to show scr image as original), fitXY, centerCrop, fitCenter, fitEnd, fitStart, centerInside.-->
  android:scaleType="center"

Seraph

Yes. It doesn't work with github.com/Clans/FloatingActionButton. It works when you are using androids FloatingActionButton – Seraph

Yeaaaah but I don't Want to do it across the app! – Busk

@Busk I you have to use fabSize and scaleType attributes if want to apply for single floating action button. I have updated my answer. – Seraph

Answer 5

The design guidelines defines two sizes and unless there is a strong reason to deviate from using either, the size can be controlled with the fabSize XML attribute of the FloatingActionButton component.

Consider specifying using either app:fabSize="normal" or app:fabSize="mini", e.g.:

<android.support.design.widget.FloatingActionButton
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:src="@drawable/ic_done_white_24px"
   app:fabSize="mini" />

Declinate

Answer 6

<ImageButton
        android:background="@drawable/action_button_bg"
        android:layout_width="56dp"
        android:layout_height="56dp"
        android:padding="16dp"
        android:src="@drawable/ic_add_black_48dp"
        android:scaleType="fitXY"
        android:elevation="8dp"/>

With the background you provided it results in below button on my device (Nexus 7 2012)

Looks good to me.

Asparagus

I set the padding but it does nothing. And the right padding would be 16 dp not 32dp – Capitalistic

Answer 7

What's your goal?

If set icon image size to bigger one:

1. Make sure to have a bigger image size than your target size (so you can set max image size for your icon)

2. My target icon image size is 84dp & fab size is 112dp:

   <android.support.design.widget.FloatingActionButton
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:layout_gravity="center"
       android:src= <image here>
       app:fabCustomSize="112dp"
       app:fabSize="auto"
       app:maxImageSize="84dp" />
   

Reprobate

Answer 8

If you are using androidx 1.0.0 and are using a custom fab size, you will have to specify the custom size using

app:fabCustomSize="your custom size in dp"

By deafult the size is 56dp and there is another variation that is the small sized fab which is 40dp, if you are using anything you will have to specify it for the padding to be calculated correctly

Fidellas

This is exactly what I was looking for! You don't even need to set layout_width and layout_height. It just works. This is also available on com.android.support:design:28.0.0 – Nordin

Answer 9

You can play with the following settings of FloatingActionButton : android:scaleType and app:maxImageSize. As for me, I've got a desirable result if android:scaleType="centerInside" and app:maxImageSize="56dp".

Aida

Answer 10

As FAB is like ImageView so You can use scaleType attribute to change the icon size likewise ImageView. Default scaleType for a FAB is fitCenter. You can use center and centerInside to make icon small and large respectively.

All values for scaleType attribute are - center, centerCrop, centerInside, fitCenter, fitEnd, fitStart, fitXY and matrix.

See https://developer.android.com/reference/android/widget/ImageView.ScaleType.html for more details.

Firebrick

Answer 11

off of @IRadha's answer in vector drawable setting android:height="_dp" and setting the scale type to android:scaleType="center" sets the drawable to whatever size was set

Teodoor

Answer 12

Using ExtendedFloatingActionButton, this solved the issue for me:

app:iconSize="<x>dp"

I've tried iconPadding or fabCustomSize but I haven't seem any changes

Evelinevelina

Thanks. Took a while to find this answer for extended FAB – Edie

Answer 13

You can easily set your FAB icon size by using,

final FloatingActionButton button = new FloatingActionButton(context);

button.setCustomSize(50);

Katlaps

Answer 14

    android:id="@+id/floatingActionButton3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:clickable="true"
    app:backgroundTint="#FBFAFA"
    app:fabCustomSize="70dp"
    app:fabSize="mini"
    app:maxImageSize="84dp"
    app:srcCompat="@drawable/resim"
    app:tint="#E81C1C"
    tools:layout_editor_absoluteX="325dp"
    tools:layout_editor_absoluteY="517dp" />

I Handled It This Way

Rumsey

id and srcCompat I prefer that you adjust these parts according to yourself. – Rumsey

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