Android 9 Development Cookbook - Third Edition

How to do it...

We will start by creating the state selector, which is a resource file defined with XML code. We will then set up the button to use our new state selector. Here are the steps:

1. Create a new Drawable resource file in the res/drawable folder and call it: state_selector.xml. The file should contain the following code:

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">    <item        android:drawable="@android:color/darker_gray"        android:state_checked="true"/>    <item        android:drawable="@android:color/white"        android:state_checked="false"/></selector>

2. Now open the activity_main.xml file and drop in ToggleButton as follows:

<ToggleButton android:layout_width="wrap_content" android:layout_height="wrap_content" ...