相关疑难解决方法(0)

我正在尝试使用自定义视图的数据绑定(George Mount 在此处显示的可能用法).

无法想象在没有<merge>标签的情况下构建复合视图.但是,在这种情况下,数据绑定失败:

MyCompoundView 类:

public class MyCompoundView extends RelativeLayout {

MyCompoundViewBinding binding;

public MyCompoundView (Context context, AttributeSet attrs) {
    super(context, attrs);
    init(context);
}

private void init(Context context){
    LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    binding = MyCompoundViewBinding.inflate(inflater, this, true);
}

my_compound_view.xml:app:isGone="@{!data.isViewVisible}"我希望控制整个复合视图的可见性

<?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="data" type="com.example.MyViewModel"/>
    </data>

    <merge
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:isGone="@{!data.isViewVisible}">

        <ImageView
            android:id="@+id/image_image"
            android:layout_width="60dp"
            android:layout_height="60dp"
            app:imageUrl="@{data.imagePhotoUrl}"/>

         <!-- tons of other views-->

    </merge>

</layout>

编译器错误:

Error:(13) No resource identifier …

我无法获得带有合并根标记的布局来处理视图绑定。是否可以？

include_layout.xml：

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <include
        android:id="@+id/include_test"
        layout="@layout/merge_layout"/>
</FrameLayout>

合并布局.xml：

<?xml version="1.0" encoding="utf-8"?>
<merge
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/include_test">

    <TextView
        android:id="@+id/title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="A Title"/>
</merge>

override fun onCreate(savedInstanceState: Bundle?) {
  super.onCreate(savedInstanceState)
  val binding = IncludeLayoutBinding.inflate(layoutInflater)
  setContentView(binding.root)
  binding.includeTest.title.text = "New Title"
}

运行时异常： java.lang.NullPointerException: Missing required view with ID: includeTest