android tutorial - Adding a floatingactionbutton (FAB) in android | Developer android - android app development - android studio - android app developement

compile 'com.android.support:design:25.3.1'

Now add the FloatingActionButton to your layout file:

<android.support.design.widget.FloatingActionButton
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_margin="16dp"
      android:src="@drawable/some_icon"/>

where the src attribute references the icon that should be used for the floating action. The result should look something like this (presuming your accent color is Material Pink):

learn android - android tutorial - android testing - mobile app developement - android code - android programming - android download - android examples

By default, the background color of your FloatingActionButton will be set to your theme's accent color. Also, note that a FloatingActionButton requires a margin around it to work properly. The recommended margin for the bottom is 16dp for phones and 24dp for tablets. Here are properties which you can use to customize the FloatingActionButton further (assuming xmlns:app="http://schemas.android.com/apk/res-auto is declared as namespace the top of your layout): app:fabSize: Can be set to normal or mini to switch between a normal sized or a smaller version. app:rippleColor: Sets the color of the ripple effect of your FloatingActionButton. Can be a color resource or hex string. app:elevation: Can be a string, integer, boolean, color value, floating point, dimension value. app:useCompatPadding: Enable compat padding. Maybe a boolean value, such as true or false. Set to true to use compat padding on api-21 and later, in order to maintain a consistent look with older api levels. You can find more examples about FAB here.