TextView textColor中的数据绑定选择器

Question

我正在尝试根据通道中未读消息的数量从textview设置颜色.像这样:

android:textColor="@{channel.unreadCount > 0 ? @color/selector_conversation_row_title_unread : @color/selector_conversation_row_title_read}"

这只会设置标题的颜色,而:

android:textColor="@color/selector_conversation_row_title_unread"

此代码将textColor设置为选择器,如果我按下TextView,颜色更改与第一个语句不同.

selector_conversation_row_title_unread:

<?xml version="1.0" encoding="UTF-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_focused="true" android:state_pressed="false" android:color="@color/colorConversationTitleUnread"/>
    <item android:state_focused="true" android:state_pressed="true" android:color="#ffffff"/>
    <item android:state_focused="false" android:state_pressed="true" android:color="#ffffff"/>
    <item android:color="@color/colorConversationTitleUnread"/>
</selector>

selector_conversation_row_title_read:

<?xml version="1.0" encoding="UTF-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_focused="true" android:state_pressed="false" android:color="@color/colorConversationTitle"/>
    <item android:state_focused="true" android:state_pressed="true" android:color="#ffffff"/>
    <item android:state_focused="false" android:state_pressed="true" android:color="#ffffff"/>
    <item android:color="@color/colorConversationTitle"/>
</selector>

为什么选择器只能用作？:

android:textColor="@color/selector_conversation_row_title_unread"

Answer 1

Android数据绑定不了解资源类型,因此您必须在表达式中提供它:

android:textColor="@{channel.unreadCount > 0 ? @colorStateList/selector_conversation_row_title_unread : @colorStateList/selector_conversation_row_title_read}"