Android数据绑定:在xml中设置默认可见性 [英] Android databinding: set default visibility in xml

问题描述

我在recyclerview中显示项目并使用数据绑定.在xml布局中，我有这样的视图:

I show items in recyclerview and use databinding. In xml layout I has such view:

 <include
        android:visibility="@{viewmodel.expandable ? View.VISIBLE : View.GONE}"
        bind:viewmodel="@{viewmodel}"
        layout="@layout/full_station_layout"/>

它工作正常，但是我有一个问题:尽管初始值viewmodel.expandable为false，但在recyclerview初始化并将项目绑定到视图时，此布局在屏幕上闪烁一次.因此，我决定暂时隐藏此布局，并尝试在XML中使用默认参数，如下所示:

It works well but I has one issue: while recyclerview initializing and bind items to views this layout flashes once on the screen although initial value viewmodel.expandable is false. So, I decided temporary hide this layout and tried using default-parameter in xml like this:

        <include
        android:visibility="@{viewmodel.expandable ? View.VISIBLE : View.GONE, default=View.GONE}"
        bind:viewmodel="@{viewmodel}"
        layout="@layout/full_station_layout"/>

但是出了点问题:

error: 'View' is incompatible with attribute android:visibility (attr) enum [gone=2, invisible=1, visible=0].

因此，或者我不正确地使用了此参数，或者Google从xml数据绑定规则中删除了此关键字(以前我在Google开发人员中看到过xml中使用 default -keyword的示例，但现在我不能了) t)

So, or I incorrectly use this parameter or Google remove this keyword from xml databinding rules (I've seen example of usage default-keyword in xml on Google developers before, but now I couldn't)

推荐答案

您可以在default属性中设置gone，visible，invisible.在下面替换.

You can set gone, visible, invisible in default property. Replace with below.

<include
        android:visibility="@{viewmodel.expandable ? View.VISIBLE : View.GONE, default=gone}"
        bind:viewmodel="@{viewmodel}"
        layout="@layout/full_station_layout"/>

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