Android Ripple Effect Overridden by Selected State

Question

After having been looking for a while I\'ve not been able to find an answer to this...

I have a recycler view with items which when selected have a red background an

Answer 1

To create a selector background that has a ripple effect and shows selected status I do the following:

Start by defining your highlight color, with some transparency:

• values/colors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="selector_color">#660000ff</color>
</resources>

You probably want to have compatibility pre-lollipop. Put a typical old-school selector inside drawable folder:

• drawable/selector_background.xml

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

And then add the following layer drawable inside drawable-v21 folder:

• drawable-v21/selector_background.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <selector>
            <item android:state_selected="true"
                android:drawable="@color/selector_color" />
            <item android:drawable="@android:color/transparent" />
        </selector>
    </item>
    <item>
        <ripple android:color="@color/selector_color">
            <item android:id="@android:id/mask">
                <color android:color="@android:color/white" />
            </item>
        </ripple>
    </item>
</layer-list>

Now you can use @drawable/selector_background for your selector.

Answer 2

So I have another case in which I had to use selector as well as layer list for that

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_selected="true">
        <ripple xmlns:android="http://schemas.android.com/apk/res/android"
                android:color="@color/colorRipple">
            <item>
                <layer-list>
                    <item>
                        <shape android:shape="rectangle">
                            <solid android:color="@color/grey_very_light" />
                        </shape>
                    </item>
                    <!-- ripple color -->
                    <item android:bottom="1dp">
                        <shape android:shape="rectangle">
                            <solid android:color="@color/c_unread_notifications_item" />
                        </shape>
                    </item>

                </layer-list>
            </item>
        </ripple>

    </item>
    <item>
        <ripple xmlns:android="http://schemas.android.com/apk/res/android"
                android:color="@color/colorRipple">
            <item>
                <!-- ripple color -->
                <layer-list>

                    <item>
                        <shape android:shape="rectangle">
                            <solid android:color="@color/grey_very_light" />
                        </shape>
                    </item>

                    <item android:bottom="1dp">
                        <shape android:shape="rectangle">
                            <solid android:color="@color/white" />
                        </shape>
                    </item>

                </layer-list>
            </item>
        </ripple>
    </item>
</selector>

This worked, for your need what you can do it just replace the item under ripple with your item shape if you don't have any layering. Hope this helps

Answer 3

It will be better if you wrap your recyclerview item view in FrameLayout and set android:background="?selectableItemBackground" of FrameLayout and the child layout of FrameLayout background="@drawable/background"

background.xml

<item android:drawable="@color/red" android:state_selected="true"/>
<item android:drawable="@color/red" android:state_focused="true"/>
<item android:drawable="@color/red" android:state_pressed="true"/>
<item android:drawable="@color/white"/>

And then child layout must has attribute android:duplicateParentState="true"