Android数据绑定三元运算符错误

Question

I'm trying to bind the enabled value of an ImageView using data binding with an ObservableInt in a ternary operator like this:

<variable
            name="myInt"
            type="android.databinding.ObservableInt"/>
...
<ImageView
        ...
        android:enabled='@{myInt > 1 ? false : true}'
        ...
        />

It works exactly as expected.

But when I change the expression to

android:enabled='@{myInt < 1 ? false : true}'

It throws the following compilation error:

The value of attribute "android:enabled" associated with an element type "ImageView" must not contain the '<' character.

Why can I check if myInt is larger than 1 but can't check if it's smaller than 1?

Answer 1

您需要为xml转义字符，如下所示：

android:enabled="@{myInt < 1 ? false : true}"