Android L FAB Button shadow

Question

In the Material Design guidelines Google presented a new style of button, the FAB Button. I found instructions how to make it but I have trouble adding the shadow.

Answer 1

You can use a Button:

where the ic_action_add is your icon.

drawable/ripple.xml is:

anim/anim.xml is:

Dimens.xml is

    56dp

    2dp
    4dp

With the elevation attribute you should set the Outline via code:

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layoutfab);

        //Outline            
        Button fab = (Button) findViewById(R.id.fab)

        ViewOutlineProvider viewOutlineProvider = new ViewOutlineProvider() {
          @Override
              public void getOutline(View view, Outline outline) {
                 // Or read size directly from the view's width/height
                 int size = getResources().getDimensionPixelSize(R.dimen.fab_size);
                 outline.setOval(0, 0, size, size);
              }
        };
        fab.setOutlineProvider(viewOutlineProvider);
    }        
}