java - 无法将 android.app.Fragment 转换为 mapping.SupportMapFragment

Question

我从这里的 map 文档中添加了这个行标记，它没有编译

mapFragment = (SupportMapFragment) getFragmentManager().findFragmentById(R.id.supportmapfragmentj);

我得到了

cannot cast android.app.Fragment to com.here.android.mpa.mapping.SupportMapFragment

知道我的 fragment xml如下

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MapGuiTestActivityJ">

<fragment
        class="com.here.android.mpa.mapping.SupportMapFragment"
        android:id="@+id/supportmapfragmentj"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</android.support.constraint.ConstraintLayout>

Answer 1

也许使用“支持 fragment 管理器”可以解决这个问题

尝试替换

mapFragment = (SupportMapFragment) getFragmentManager().findFragmentById(R.id.supportmapfragmentj);

---

与

mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.supportmapfragmentj);