[鸿蒙开发]鸿蒙开发踩坑一：WebView报空指针

今天学习WebView相关的知识，实践的时候一直报WebView空指针，最后排查发现是布局文件的问题。
原先的布局文件

<?xml version="1.0" encoding="utf-8"?>
<DirectionalLayout
    xmlns:ohos="http://schemas.huawei.com/res/ohos"
    ohos:height="match_parent"
    ohos:width="match_parent"
    ohos:alignment="center"
    ohos:orientation="vertical">

    <WebView
        ohos:id="$+id:webview"
        ohos:height="match_parent"
        ohos:width="match_parent"/>

</DirectionalLayout>

这里是按照Android习惯，直接写的WebView,而正确的应该是把WebView的全路径写出来才不会报空指针

<?xml version="1.0" encoding="utf-8"?>
<DirectionalLayout
    xmlns:ohos="http://schemas.huawei.com/res/ohos"
    ohos:height="match_parent"
    ohos:width="match_parent"
    ohos:alignment="center"
    ohos:orientation="vertical">

    <ohos.agp.components.webengine.WebView
        ohos:id="$+id:webview"
        ohos:height="match_parent"
        ohos:width="match_parent"/>

</DirectionalLayout>

具体原因有大佬知道吗？求指导