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Floating Action Button (requires Android-L preview)

Floating Action Button (requires Android-L preview)

public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layoutfab);
//Outline
int size = getResources().getDimensionPixelSize(R.dimen.fab_size);
Outline outline = new Outline();
outline.setOval(0, 0, size, size);
findViewById(R.id.fab).setOutline(outline);
}
}
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:state_enabled="true"
android:state_pressed="true">
<objectAnimator
android:duration="@android:integer/config_shortAnimTime"
android:propertyName="translationZ"
android:valueFrom="@dimen/button_elevation"
android:valueTo="@dimen/button_press_elevation"
android:valueType="floatType" />
</item>
<item>
<objectAnimator
android:duration="@android:integer/config_shortAnimTime"
android:propertyName="translationZ"
android:valueFrom="@dimen/button_press_elevation"
android:valueTo="@dimen/button_elevation"
android:valueType="floatType" />
</item>
</selector>
<resources>
<dimen name="fab_size">56dp</dimen>
<dimen name="button_elevation">2dp</dimen>
<dimen name="button_press_elevation">4dp</dimen>
</resources>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<ImageButton
android:id="@+id/fab"
android:layout_alignParentRight="true"
android:layout_alignParentBottom="true"
android:layout_width="@dimen/fab_size"
android:layout_height="@dimen/fab_size"
android:layout_gravity="bottom|right"
android:layout_marginRight="16dp"
android:layout_marginBottom="16dp"
android:background="@drawable/ripple"
android:stateListAnimator="@anim/anim"
android:src="@drawable/ic_action_add"
android:elevation="4dp"
/>
</RelativeLayout>
<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>

Hi! Great example. I was able to make this in first trial, but for some reason button.setOutline(outline) stopped getting resolved all of a sudden and I get rectangle buttons. I am not able to figure out why. Any help would be appreciated.

ysong commented Sep 5, 2014

nice work!

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

    //Outline
    int size = getResources().getDimensionPixelSize(R.dimen.fab_size);
    Outline outline = new Outline();
    outline.setOval(0, 0, size, size);
    findViewById(R.id.fab).setOutline(outline);
}

Since setOutline is not available anymore on 5.0 SDK, it is recommended to use ViewOutlineProvider and set it as

findViewById(R.id.fab).setOutlineProvider(new ViewOutlineProvider() { 
            @Override
            public void getOutline(View view, Outline outline) {
                int size = getResources().getDimensionPixelSize(R.dimen.fab_size);
                outline.setOval(0,0,size,size);
            }
});
findViewById(R.id.fab).setClipToOutline(true).

What about the design support library's new FloatingActionButton? Can you please show an example using the StateListAnimator to get the translationZ and the ripple effect?

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