小编nex*_*n24的帖子

我在数据绑定Android教程中陷入困境。我发现将数据绑定到视图时遇到问题。

 public class DataView extends FrameLayout {
 private DataViewBinding binding;

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

 @Override
 protected void onFinishInflate()
 {
     super.onFinishInflate();
     binding = DataViewBinding.bind(this);       <---
 }

 @Override
 protected void onAttachedToWindow()
 {
     super.onAttachedToWindow();
     DataSource dataSource = DataSource.get("Data View");
     binding.setDataSource(dataSource);          <---
 } }

data_view.xml

<layout>
    <data>
        <variable
            name="dataSource"
            type="com.example.kaz.simplebindingdemo.DataSource" />
    </data>
    <com.example.kaz.simplebindingdemo.DataView
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingTop="16dp"
        tools:showIn="@layout/content_main"
        tools:context=".DataView">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="@{dataSource.message}" />
    </com.example.kaz.simplebindingdemo.DataView>
</layout>

在渲染中，我遇到了异常：

java.lang.RuntimeException: view tag isn't correct on view:null     at
com.example.kaz.simplebindingdemo.databinding.DataViewBinding.bind(DataViewBinding.java:123)
    at
com.example.kaz.simplebindingdemo.databinding.DataViewBinding.bind(DataViewBinding.java:119) …