问题描述
我开始使用Android数据绑定,但没有成功.我已经完成了文档,但是当我必须设置方法值时,我会得到null.我正在使用Android Studio 2.1.2,并且已放入gradle
I started using Android Data binding but without success.I have done everything as proposed in the documentation but when I have to set method value I get null.I am using Android Studio 2.1.2 and I put in gradle
dataBinding {
enabled = true
}
在布局中,我所做的放置布局完全相同,而在内部放置标签数据:
in layout I do exactly da same put layout and inside I put tag data:
<data>
<variable name="order" type="com.example.Order"/>
</data>
以及我想拥有绑定变量的代码
and in code when I want to have binding variable
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
ActivityOrderOnePaneBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_order_one_pane);
binding.setOrder(mOrder);
绑定为空,我没有编译错误.
Binding is null,I don't have compile errors.
推荐答案
由于您要覆盖Activity
中的setContentView
,因此需要替换:
Since you're overriding setContentView
in your Activity
, you need to replace:
ActivityOrderOnePaneBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_order_one_pane);
使用
ActivityOrderOnePaneBinding binding = DataBindingUtil.inflate(getLayoutInflater(), R.layout.activity_order_one_pane, getContentFrame(), false);
setContentView(binding.getRoot());
我遇到了同样的问题,因为我在基础Activity
中覆盖了setContentView
并修复了该问题.
I had the same problem because I overrode setContentView
in my base Activity
and that fixed it.
如果您覆盖setContentView
,则getContentFrame()
是包含内容的ViewGroup
,不包括AppBarLayout
和Toolbar
.这是一个getContentFrame()
的示例,如果您的基本布局类似于以下内容:
If you overrode setContentView
, getContentFrame()
is the ViewGroup
that contains your content, exclusive of the AppBarLayout
and Toolbar
. Here's an example of what getContentFrame()
would look like if you had a base layout similar to what's below:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
...>
<android.support.design.widget.CollapsingToolbarLayout
...>
<android.support.v7.widget.Toolbar
.../>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v7.widget.ContentFrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:id="@+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</android.support.v7.widget.ContentFrameLayout>
</android.support.design.widget.CoordinatorLayout>
getContentFrame()
仅返回上述布局中的FrameLayout
.
getContentFrame()
just returns the FrameLayout
in the above layout.
protected ViewGroup getContentFrame() {
return (ViewGroup) findViewById(R.id.content_frame);
}
我希望这会有所帮助.
这篇关于DataBindingUtil.setContentView(this,resource)返回null的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!