How to set state_selected in ripple drawable
To add to @Sohaib 's answer:
@Alanv is right that the OP didn't need a mask. But if one of your selector states is transparent and you need a mask it goes here:
<?xml version="1.0" encoding="utf-8"?>
<ripple
xmlns:android="http://schemas.android.com/apk/res/android"
android:color="@color/ripple_color">
<!-- mask here... -->
<item android:id="@android:id/mask">
<color android:color="@color/black"/> <!-- any color will do -->
</item>
<item>
<selector>
<!-- ... NOT here. -->
<item android:state_selected="true">
<color android:color="@color/blue"/>
</item>
<item android:state_activated="true">
<color android:color="@color/red"/>
</item>
<item>
<color android:color="@color/transparent"/>
</item>
</selector>
</item>
</ripple>
I initially had the mask inside my selector and :boom:
Found the answer, just in case someone else having the same problem
<?xml version="1.0" encoding="utf-8"?>
<ripple
xmlns:android="http://schemas.android.com/apk/res/android"
android:color="#DDDDDD"
>
<item>
<selector>
<item android:state_selected="true">
<color android:color="#EEEEEE" />
</item>
<item android:state_activated="true">
<color android:color="#EEEEEE" />
</item>
<item>
<color android:color="#FFFFFF" />
</item>
</selector>
</item>
</ripple>
Combining the above answer with other answers from:
What should be the color of the Ripple, colorPrimary or colorAccent? (Material Design)
Gives a nice ripple effect which also works for when the item is in a selected state.
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
android:color="?attr/colorControlHighlight">
<!-- Ripple mask - applied to all selector states -->
<item android:id="@android:id/mask">
<color android:color="#42ffffff" />
</item>
<!-- Selected state of item -->
<item>
<selector>
<item android:state_selected="true">
<color android:color="?attr/colorAccent" />
</item>
</selector>
</item>
</ripple>
This goes in your drawable-v21 folder, for other platforms you can just create a selector which uses the accent color:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@color/accent" android:state_selected="true"/>
<item android:drawable="@color/accent" android:state_pressed="true"/>
</selector>