221

Floating button 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:
Floating button result
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

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1

14 Answers 14

Reset to default
201

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

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4 Comments

Any ways, you don't get this in 28.0.0 version, you will get it in androidx.
I haven't switched to AndroidX, this is what I am using: api 'com.android.support:design:28.0.0'
This worked for me but I would like more information to understand why defining a maxIconSize changes the icon size.
Can you please tell me how to set maxImageSize programmatically? I couldn't find the answer.
199

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.

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9 Comments

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.
I don't understand your question, there are 18dp, 24dp, 36dp and 48dp for different size images.
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 ?
ImageButton is a subclass of ImageView so you have a scaleType attribut and default scaleType is ScaleType.FIT_CENTER
No longer works with com.android.support:support-v4:28.0.0-rc01
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138

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.

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3 Comments

Can you please tell me how to set maxImageSize programmatically? I couldn't find the answer.
@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.
maxImageSize worked for me for showing full drawable in floating button.
125

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"
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3 Comments

Yes. It doesn't work with github.com/Clans/FloatingActionButton. It works when you are using androids FloatingActionButton
Yeaaaah but I don't Want to do it across the app!
@StarWind0 I you have to use fabSize and scaleType attributes if want to apply for single floating action button. I have updated my answer.
31

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" />
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Comments

18 
<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)

enter image description here

Looks good to me.

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1 Comment

I set the padding but it does nothing. And the right padding would be 16 dp not 32dp
17

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" />
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Comments

11

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

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1 Comment

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
7

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".

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5

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.

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3

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

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2

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

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1 Comment

Thanks. Took a while to find this answer for extended FAB
0

You can easily set your FAB icon size by using,

final FloatingActionButton button = new FloatingActionButton(context);

button.setCustomSize(50);

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Comments

-1 
    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

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2 Comments

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