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

Solution 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.

Solution 2

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

Solution 3

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"

Solution 4

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.

Solution 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" />

View more solutions

Comments

[InsaneCat]

Possible duplicate of : stackoverflow.com/a/59455009/3974530

[vovahost]

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

[vovahost]

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.

[Gaëtan Maisse]

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

[vovahost]

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 ?

[Gaëtan Maisse]

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

[vovahost]

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

[Gaëtan Maisse]

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

[vovahost]

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

[Abhishek]

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

[Lakhwinder Singh Dhillon]

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

[StarWind0]

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

[Abhishek]

@StarWind0 I you have to use fabSize and scaleType attributes if want to apply for single floating action button. I have updated my answer.

[StarWind0]

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

[Khemraj Sharma]

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

[Robin]

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

[Aloha]

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

[stramin]

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

[Chitrang]

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

[Chitrang]

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

[varun]

@Chitrang 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.

[Akash Bisariya]

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

[Sertan]

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

[Admin]

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[neo]

it works for me. thanks