与元素类型"变量"关联的Android-Binding"type"不得包含"<"字符

Question

我收到以下错误:与元素类型"变量"关联的属性"type"的值不得包含"<"字符.

并且type ="ObservableField"/>在xml中显示为红色.

有任何想法吗？

 <?xml version="1.0" encoding="utf-8"?>
 <layout>

<data>

<import type="android.databinding.ObservableField"/>
<variable name="field" type="ObservableField<String>"/>

</data>

<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">

<TextView
    android:id="@+id/textView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="72dp"
    android:text="@{field.get()}"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<Button
    android:id="@+id/button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="181dp"
    android:layout_marginEnd="149dp"
    android:layout_marginStart="147dp"
    android:layout_marginTop="191dp"
    android:text="Button"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/textView" />

</android.support.constraint.ConstraintLayout>

</layout>

Answer 1

有点晚了,但你可以通过分别替换<和> for <和来做到这一点>.

像这样: <variable name="field" type="ObservableField&lt;String&gt;"/>

Answer 2

试试这个

<?xml version="1.0" encoding="utf-8"?>
 <layout>

<data>

<variable name="field" type="android.databinding.ObservableField"/>

</data>

<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

<TextView
    android:id="@+id/textView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="72dp"
    android:text="@{field.get}"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<Button
    android:id="@+id/button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="181dp"
    android:layout_marginEnd="149dp"
    android:layout_marginStart="147dp"
    android:layout_marginTop="191dp"
    android:text="Button"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/textView" />

</android.support.constraint.ConstraintLayout>

</layout>

并访问此了解更多详细信息