Android: toggle text color of ToggleButton

问题:

To create a custom ToggleButton, I've defined a new style in /res/values/styles.xml:

<style name="myToggleButton">
    <item name="android:layout_width">wrap_content</item>
    <item name="android:layout_height">wrap_content</item>
    <item name="android:textColor">#000000</item>
    <item name="android:background">@drawable/my_toggle_button</item>
</style>

and I then use a selector to specify how the button's states look in /res/drawable/my_toggle_button.xml:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_checked="true">
        <shape>
            [...]
        </shape>
    </item>
    <item android:state_checked="false"
        <shape>
            [...]
        </shape>
    </item>
</selector>

How can I modify this setup to toggle the text color of the button when the state changes?

回答1:

Create a similar state list for the text colors you would like, and place it in res/color, e.g.

res/color/toggle_color.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_checked="true" android:color="#070" />
    <!-- Default State -->
    <item android:color="#A00" />
</selector>

Then set this resource as the text color of the button:

<item name="android:textColor">@color/toggle_color</item>

P.S., it's good practice to have the last item in a selector not have any state flags attached (i.e. a default state) rather than defining it with the inverse of the above states.