How can I add shadow to ImageButton?

Question

this is my first time posting. And I've been using this website as a great resource. But I have come upon an issue. I've tried applying a shadow effect to my ImageButton but it doest work? What I'm trying to achieve is the shadow you can see on the floating bubble (Material Design). I have a circle ImageButton, but I wish to add a shadow around it. How can I achieve that?

This is circle_button.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <solid android:color="#C62666"/>
</shape>

This is circle_button_pressed.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <solid android:color="#E92D6C"/>
</shape>

This is my selector which combines both drawable's into one. button.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/circle_button"
        android:state_focused="true"
        android:state_pressed="true" />
    <item android:drawable="@drawable/circle_button_pressed"
        android:state_focused="false"
        android:state_pressed="true" />
    <item android:drawable="@drawable/circle_button_pressed"
            android:state_focused="true" />
    <item android:drawable="@drawable/circle_button"
        android:state_focused="false"
        android:state_pressed="false" />
</selector>

And this is how I apply it to my ImageButton

<ImageButton
           android:id="@+id/btn_apply"
           android:layout_width="68dp"
           android:layout_height="68dp"
           android:layout_alignParentTop="true"
           android:layout_alignRight="@+id/scrollView1"
           android:layout_marginRight="45dp"
           android:layout_marginTop="94dp"
           android:adjustViewBounds="true"
           android:background="@drawable/button"
           android:scaleType="fitCenter"
           android:src="@drawable/apply_two" />

So again? How can I add a shadow to my button? Thanks for your time.

Solution

may help you : You can use a Button:

<ImageButton
        android:id="@+id/fab"
        android:background="@drawable/ripple"
        android:stateListAnimator="@anim/anim"
        android:src="@drawable/ic_action_add"
        android:elevation="4dp"
        />

where the ic_action_add is your icon.

drawable/ripple.xml is:

<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>

anim/anim.xml is:

<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>

Dimens.xml is :

<resources>
<dimen name="fab_size">56dp</dimen>

<dimen name="button_elevation">2dp</dimen>
<dimen name="button_press_elevation">4dp</dimen>

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


}