Android数据绑定使用包含标签 [英] Android Data Binding using include tag

问题描述

更新：

上述示例正常工作，因为版本1.0-rc4固定需要不必要的变量的问题。 >

main.xml：

 < layout xmlns：andr ... 
< data> 
< / data> 
< include layout =@ layout / buttons>< / include> 
 .... 
  

buttons.xml：

 < layout xmlns：andr ...> 
< data> 
< / data> 
< Button 
 android：id =@ + id / button
 ..../> 
  

MyActivity.java：

  ... binding = DataBindingUtil.inflate。 
 binding.button;  - >无法解析符号'按钮'
  

如何获取按钮？

解决方案

问题是包含的布局不被认为是数据绑定布局它作为一个，你需要传递一个变量：

buttons.xml：

 code>< layout xmlns：andr ...> 
< data> 
< variable name =footype =int/> 
& / data> 
< Button 
 android：id =@ + id / button
 ..../> 
  

main.xml：

 < layout xmlns：andr ... 
 ... 
< include layout =@ layout / buttons
 android：id =@ + id / buttons
 app：foo =@ {1}/> 
 .... 
  

然后您可以通过按钮字段间接访问按钮： mainBinding绑定= MainBinding.inflate（getLayoutInflater（））; p>

  
 binding.buttons.button 
  

从1.0-rc4（刚刚发布）开始，您不再需要该变量。您可以简化为：

buttons.xml：

  ; layout xmlns：andr ...> 
< Button 
 android：id =@ + id / button
 ..../> 
  

main.xml：

 < layout xmlns：andr ... 
 ... 
< include layout =@ layout / buttons
 android：id =@ + id / buttons/> 
 .... 
  

UPDATE:

The above example works properly, because release 1.0-rc4 fixed the issue of needing the unnecessary variable.

main.xml:

<layout xmlns:andr...
    <data>
    </data>
       <include layout="@layout/buttons"></include>
....

buttons.xml:

<layout xmlns:andr...>
    <data>
    </data>
    <Button
        android:id="@+id/button"
        ...." />

MyActivity.java:

 ... binding = DataBindingUtil.inflate...
binding.button; ->cannot resolve symbol 'button'

how to get button?

解决方案

The problem is that the included layout isn't being thought of as a data-bound layout. To make it act as one, you need to pass a variable:

buttons.xml:

<layout xmlns:andr...>
  <data>
    <variable name="foo" type="int"/>
  </data>
  <Button
    android:id="@+id/button"
    ...." />

main.xml:

<layout xmlns:andr...
...
   <include layout="@layout/buttons"
            android:id="@+id/buttons"
            app:foo="@{1}"/>
....

Then you can access buttons indirectly through the buttons field:

MainBinding binding = MainBinding.inflate(getLayoutInflater());
binding.buttons.button

As of 1.0-rc4 (just released), you no longer need the variable. You can simplify it to:

buttons.xml:

<layout xmlns:andr...>
  <Button
    android:id="@+id/button"
    ...." />

main.xml:

<layout xmlns:andr...
...
   <include layout="@layout/buttons"
            android:id="@+id/buttons"/>
....

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