在xml文件中控制字体颜色随着按钮状态改变

1、创建on_blace_off_white_selector.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true"
          android:color="@color/black"
          android:drawable="@color/black"/>
    <!-- pressed -->
    <item android:state_focused="true"
          android:color="@color/black"
          android:drawable="@color/black"/>
    <!-- focused -->
    <item android:state_checked="true"
          android:color="@color/black"
          android:drawable="@color/black"/>
    <!-- checked -->


    <item android:color="@color/white"
          android:drawable="@color/white"/>
    <!-- default 此为默认的，一定要有-->
</selector>

NOTE:其为一个selector，drawable如果不设置，编译可能无法通过，如果要此selector要被设置为textColor，那么color选项一定要有

2、在对应的按钮中设置textColor为@drawable/on_blace_off_white_selector,如下:

<RadioButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                style="@style/home_page_tab_style"
                android:textColor="@drawable/on_black_off_white_selector"
                android:text="haha"
                />