Android 数据绑定:包含标签的可见性 [英] Android Data Binding: visibility on include tag
问题描述
根据 http://developer.android.com/tools/data-binding/guide.html#imports,我们可以在可见性中有这样简单的表达式:
As per http://developer.android.com/tools/data-binding/guide.html#imports, we can have such simple expressions in visibility:
<TextView
..
android:visibility="@{user.isAdult ? View.VISIBLE : View.GONE}"/>
但是当我尝试在 include
标签中做同样的事情时,就像这样:
But when I try to do the same in an include
tag, like so:
<include
android:id="@+id/image_layout"
layout="@layout/image_layout"
android:visibility="@{notification.notifType == 0 ? View.VISIBLE : View.GONE}"/>
然后 Studio 不仅将表达式显示为红色,而且在构建时在自动生成的绑定类中给出以下错误:
Then Studio not only shows the expression in red, but upon building it gives the following error in the auto-generated binding class:
错误:(138, 29) 错误:找不到符号方法 setVisibility(int)
Error:(138, 29) error: cannot find symbol method setVisibility(int)
这里是自动生成的绑定类发生错误的地方
Here's where the error occurs in the auto-generated binding class
// batch finished
if ((dirtyFlags & 0x3L) != 0) {
// api target 1
this.imageLayout.setVisibility(NotifTypeNotificatio1);
}
imageLayout.executePendingBindings();
推荐答案
我想你正在尝试做的事情看起来像这样:
I imagine what you are trying to do would look something like this:
在您包含的布局中,指定一个布尔变量并将其绑定到所需视图的可见性
<layout xmlns:android="http://schemas.android.com/apk/res/android">
<data>
<import type="android.view.View"/>
<variable
name="isVisible"
type="boolean"/>
</data>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="@{isVisible ? View.VISIBLE : View.GONE}"/>
</layout>
然后在你的调用布局中绑定你的值
<include
android:id="@+id/image_layout"
layout="@layout/image_layout"
bind:isVisible="@{notification.notifType == 0}"/>
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