按钮字体颜色的设置

<item android:state_focused="false" android:state_enabled="true" android:state_pressed="false"
        android:color="@color/text_hint_color" />
    <item android:state_enabled="false" android:color="@color/white" />
    <item android:state_pressed="true" android:color="@color/white" />
    <item android:state_focused="true"   android:color="@color/white" />
    <item android:state_checked="true" android:color="@color/white"/>
    <item android:color="@color/text_hint_color"/>