How to make a circular ripple on a button when it&

Question

Background

On the dialer app of Android, when you start searching for something, and you click the arrow button on the left of the EditText, you get a circular ripple effect on it :

The problem

I've tried to have it too, but I got a rectangular one:

    <ImageButton
        android:id="@+id/navButton"
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:layout_gravity="center_vertical"
        android:layout_marginLeft="8dp"
        android:background="?android:attr/selectableItemBackground"
        android:src="@drawable/search_ic_back_arrow"/>

The question

How do I make the button have a circular ripple effect when being clicked? Do I have to create a new drawable, or is there a built in way for that?

Answer 1

You can create circle ripple drawable using android:radius attribute in xml.

Example:

<ripple xmlns:android="http://schemas.android.com/apk/res/android"
    android:color="your_color"
    android:radius="your_radius" />

Pay attention, that your your_radius should be less then your view width and height. For example: if you have view with size 60dp x 60dp your_radius should be near 30dp (width / 2 or height / 2).

Work on Android 5.0 and above.

Answer 2

Another attribute with round ripple effect, specially for action bar:

android:background="?actionBarItemBackground"

Answer 3

If you want more generic XML files, I have two files:

1) btn_ripple_background with code:

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

2) ripple_circuler_shape with code:

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

finally the usage:android:foreground="@drawable/ripple_btn_background"

Answer 4

If you are using AppCompat theme, then you could set the background of the view as:

android:background="?selectableItemBackgroundBorderless"

This will add circular ripple on 21 and above and square background on below 21.

Answer 5

If you already have a background image, here is an example of a ripple that looks close to selectableItemBackgroundBorderless:

            <ImageButton
                android:id="@+id/btn_show_filter_dialog"
                android:layout_width="24dp"
                android:layout_height="24dp"
                android:background="@drawable/ic_filter_state"/>

ic_filter_state.xml:

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

state_pressed_ripple.xml: (opacity set to 10% on white background) 1AFFFFFF

 <?xml version="1.0" encoding="UTF-8"?>    
    <ripple xmlns:android="http://schemas.android.com/apk/res/android">
        <item>
            <shape android:shape="oval">
                <solid android:color="#1AFFFFFF"/>
            </shape>
            <color android:color="#FFF"/>
        </item>
    </ripple>

Answer 6

Just Add this background to your view "android:background=?android:attr/actionBarItemBackground"