[英]Android data binding: cannot inject an attribute into “include” tag
I'm trying to create a reusable layout included.xml
which then could be injected into other layouts and customized via tag attributes. 我试图创建一个可重用的布局included.xml
然后可能被注入到其它的布局,并通过标记属性定制。 Here's what I have: 这是我所拥有的:
res/layout/parent.xml
: res/layout/parent.xml
:
<?xml version="1.0" encoding="utf-8"?>
<layout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/com.myself.fancyapp"
>
<include layout="@layout/included"
app:src123="@drawable/my_icon" />
</layout>
res/layout/included.xml
: res/layout/included.xml
:
<?xml version="1.0" encoding="utf-8"?>
<layout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
>
<data>
<variable name="src123" type="android.graphics.drawable.Drawable" />
</data>
<android.support.design.widget.FloatingActionButton
android:src="@{src123}" />
</layout>
app/build.gradle
: app/build.gradle
:
android {
compileSdkVersion 23
buildToolsVersion "23.0.2"
dataBinding {
enabled = true
}
....
}
dependencies {
compile 'com.android.support:appcompat-v7:23.1.1'
compile 'com.android.support:design:23.1.1'
}
As an outcome, the button which I try to inject doesn't contain any image at all. 结果,我尝试插入的按钮根本不包含任何图像。
If in parent.xml
I change xmlns:app
to res-auto
, I have the following error in app/build/intermediate/data-binding-layout-out/debug/layout/parent.xml
: 如果在parent.xml
我将xmlns:app
更改为res-auto
,则在app/build/intermediate/data-binding-layout-out/debug/layout/parent.xml
出现以下错误:
Error:(17) No resource identifier found for attribute 'src123' in package 'com.myself.fancyapp' 错误:(17)在包'com.myself.fancyapp'中找不到属性'src123'的资源标识符
Does anybody have an idea why this happens and how to fix this? 有谁知道为什么会这样以及如何解决这个问题? Thanks. 谢谢。
The problem is that you're not using binding syntax for the variable: 问题是您没有对变量使用绑定语法:
<include layout="@layout/included"
app:src123="@drawable/my_icon" />
should be: 应该:
<include layout="@layout/included"
app:src123="@{@drawable/my_icon}" />
Unrelated, but I don't think that includes are allowed as the root element of a layout. 无关,但我认为不允许将include作为布局的根元素。 I believe that you're going to have to have a normal View surrounding the include. 我相信您将必须对包含文件有一个普通的视图。
<?xml version="1.0" encoding="utf-8"?>
<layout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/com.myself.fancyapp"
>
<FrameLayout android:layout_width="match_parent"
android:layout_height="match_parent">
<include layout="@layout/included"
app:src123="@{@drawable/my_icon}" />
</FrameLayout>
</layout>
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